rtmpproto.c 105 KB
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/*
 * RTMP network protocol
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 * Copyright (c) 2009 Konstantin Shishkov
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 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/**
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 * @file
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 * RTMP protocol
 */

#include "libavcodec/bytestream.h"
#include "libavutil/avstring.h"
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#include "libavutil/base64.h"
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#include "libavutil/hmac.h"
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#include "libavutil/intfloat.h"
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#include "libavutil/lfg.h"
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#include "libavutil/md5.h"
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#include "libavutil/opt.h"
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#include "libavutil/random_seed.h"
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#include "avformat.h"
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#include "internal.h"
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#include "network.h"

#include "flv.h"
#include "rtmp.h"
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#include "rtmpcrypt.h"
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#include "rtmppkt.h"
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#include "url.h"
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#if CONFIG_ZLIB
#include <zlib.h>
#endif

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#define APP_MAX_LENGTH 1024
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#define PLAYPATH_MAX_LENGTH 512
#define TCURL_MAX_LENGTH 1024
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#define FLASHVER_MAX_LENGTH 64
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#define RTMP_PKTDATA_DEFAULT_SIZE 4096
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#define RTMP_HEADER 11
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/** RTMP protocol handler state */
typedef enum {
    STATE_START,      ///< client has not done anything yet
    STATE_HANDSHAKED, ///< client has performed handshake
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    STATE_FCPUBLISH,  ///< client FCPublishing stream (for output)
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    STATE_PLAYING,    ///< client has started receiving multimedia data from server
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    STATE_SEEKING,    ///< client has started the seek operation. Back on STATE_PLAYING when the time comes
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    STATE_PUBLISHING, ///< client has started sending multimedia data to server (for output)
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    STATE_RECEIVING,  ///< received a publish command (for input)
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    STATE_SENDING,    ///< received a play command (for output)
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    STATE_STOPPED,    ///< the broadcast has been stopped
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} ClientState;

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typedef struct TrackedMethod {
    char *name;
    int id;
} TrackedMethod;

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/** protocol handler context */
typedef struct RTMPContext {
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    const AVClass *class;
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    URLContext*   stream;                     ///< TCP stream used in interactions with RTMP server
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    RTMPPacket    *prev_pkt[2];               ///< packet history used when reading and sending packets ([0] for reading, [1] for writing)
    int           nb_prev_pkt[2];             ///< number of elements in prev_pkt
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    int           in_chunk_size;              ///< size of the chunks incoming RTMP packets are divided into
    int           out_chunk_size;             ///< size of the chunks outgoing RTMP packets are divided into
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    int           is_input;                   ///< input/output flag
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    char          *playpath;                  ///< stream identifier to play (with possible "mp4:" prefix)
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    int           live;                       ///< 0: recorded, -1: live, -2: both
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    char          *app;                       ///< name of application
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    char          *conn;                      ///< append arbitrary AMF data to the Connect message
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    ClientState   state;                      ///< current state
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    int           stream_id;                  ///< ID assigned by the server for the stream
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    uint8_t*      flv_data;                   ///< buffer with data for demuxer
    int           flv_size;                   ///< current buffer size
    int           flv_off;                    ///< number of bytes read from current buffer
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    int           flv_nb_packets;             ///< number of flv packets published
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    RTMPPacket    out_pkt;                    ///< rtmp packet, created from flv a/v or metadata (for output)
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    uint32_t      client_report_size;         ///< number of bytes after which client should report to server
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    uint64_t      bytes_read;                 ///< number of bytes read from server
    uint64_t      last_bytes_read;            ///< number of bytes read last reported to server
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    uint32_t      last_timestamp;             ///< last timestamp received in a packet
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    int           skip_bytes;                 ///< number of bytes to skip from the input FLV stream in the next write call
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    int           has_audio;                  ///< presence of audio data
    int           has_video;                  ///< presence of video data
    int           received_metadata;          ///< Indicates if we have received metadata about the streams
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    uint8_t       flv_header[RTMP_HEADER];    ///< partial incoming flv packet header
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    int           flv_header_bytes;           ///< number of initialized bytes in flv_header
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    int           nb_invokes;                 ///< keeps track of invoke messages
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    char*         tcurl;                      ///< url of the target stream
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    char*         flashver;                   ///< version of the flash plugin
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    char*         swfhash;                    ///< SHA256 hash of the decompressed SWF file (32 bytes)
    int           swfhash_len;                ///< length of the SHA256 hash
    int           swfsize;                    ///< size of the decompressed SWF file
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    char*         swfurl;                     ///< url of the swf player
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    char*         swfverify;                  ///< URL to player swf file, compute hash/size automatically
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    char          swfverification[42];        ///< hash of the SWF verification
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    char*         pageurl;                    ///< url of the web page
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    char*         subscribe;                  ///< name of live stream to subscribe
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    int           server_bw;                  ///< server bandwidth
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    int           client_buffer_time;         ///< client buffer time in ms
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    int           flush_interval;             ///< number of packets flushed in the same request (RTMPT only)
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    int           encrypted;                  ///< use an encrypted connection (RTMPE only)
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    TrackedMethod*tracked_methods;            ///< tracked methods buffer
    int           nb_tracked_methods;         ///< number of tracked methods
    int           tracked_methods_size;       ///< size of the tracked methods buffer
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    int           listen;                     ///< listen mode flag
    int           listen_timeout;             ///< listen timeout to wait for new connections
    int           nb_streamid;                ///< The next stream id to return on createStream calls
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    double        duration;                   ///< Duration of the stream in seconds as returned by the server (only valid if non-zero)
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    char          username[50];
    char          password[50];
    char          auth_params[500];
    int           do_reconnect;
    int           auth_tried;
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} RTMPContext;

#define PLAYER_KEY_OPEN_PART_LEN 30   ///< length of partial key used for first client digest signing
/** Client key used for digest signing */
static const uint8_t rtmp_player_key[] = {
    'G', 'e', 'n', 'u', 'i', 'n', 'e', ' ', 'A', 'd', 'o', 'b', 'e', ' ',
    'F', 'l', 'a', 's', 'h', ' ', 'P', 'l', 'a', 'y', 'e', 'r', ' ', '0', '0', '1',

    0xF0, 0xEE, 0xC2, 0x4A, 0x80, 0x68, 0xBE, 0xE8, 0x2E, 0x00, 0xD0, 0xD1, 0x02,
    0x9E, 0x7E, 0x57, 0x6E, 0xEC, 0x5D, 0x2D, 0x29, 0x80, 0x6F, 0xAB, 0x93, 0xB8,
    0xE6, 0x36, 0xCF, 0xEB, 0x31, 0xAE
};

#define SERVER_KEY_OPEN_PART_LEN 36   ///< length of partial key used for first server digest signing
/** Key used for RTMP server digest signing */
static const uint8_t rtmp_server_key[] = {
    'G', 'e', 'n', 'u', 'i', 'n', 'e', ' ', 'A', 'd', 'o', 'b', 'e', ' ',
    'F', 'l', 'a', 's', 'h', ' ', 'M', 'e', 'd', 'i', 'a', ' ',
    'S', 'e', 'r', 'v', 'e', 'r', ' ', '0', '0', '1',

    0xF0, 0xEE, 0xC2, 0x4A, 0x80, 0x68, 0xBE, 0xE8, 0x2E, 0x00, 0xD0, 0xD1, 0x02,
    0x9E, 0x7E, 0x57, 0x6E, 0xEC, 0x5D, 0x2D, 0x29, 0x80, 0x6F, 0xAB, 0x93, 0xB8,
    0xE6, 0x36, 0xCF, 0xEB, 0x31, 0xAE
};

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static int handle_chunk_size(URLContext *s, RTMPPacket *pkt);
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static int handle_server_bw(URLContext *s, RTMPPacket *pkt);
static int handle_client_bw(URLContext *s, RTMPPacket *pkt);
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static int add_tracked_method(RTMPContext *rt, const char *name, int id)
{
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    int err;
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    if (rt->nb_tracked_methods + 1 > rt->tracked_methods_size) {
        rt->tracked_methods_size = (rt->nb_tracked_methods + 1) * 2;
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        if ((err = av_reallocp(&rt->tracked_methods, rt->tracked_methods_size *
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                               sizeof(*rt->tracked_methods))) < 0) {
            rt->nb_tracked_methods = 0;
            rt->tracked_methods_size = 0;
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            return err;
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        }
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    }

    rt->tracked_methods[rt->nb_tracked_methods].name = av_strdup(name);
    if (!rt->tracked_methods[rt->nb_tracked_methods].name)
        return AVERROR(ENOMEM);
    rt->tracked_methods[rt->nb_tracked_methods].id = id;
    rt->nb_tracked_methods++;

    return 0;
}

static void del_tracked_method(RTMPContext *rt, int index)
{
    memmove(&rt->tracked_methods[index], &rt->tracked_methods[index + 1],
            sizeof(*rt->tracked_methods) * (rt->nb_tracked_methods - index - 1));
    rt->nb_tracked_methods--;
}

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static int find_tracked_method(URLContext *s, RTMPPacket *pkt, int offset,
                               char **tracked_method)
{
    RTMPContext *rt = s->priv_data;
    GetByteContext gbc;
    double pkt_id;
    int ret;
    int i;

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    bytestream2_init(&gbc, pkt->data + offset, pkt->size - offset);
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    if ((ret = ff_amf_read_number(&gbc, &pkt_id)) < 0)
        return ret;

    for (i = 0; i < rt->nb_tracked_methods; i++) {
        if (rt->tracked_methods[i].id != pkt_id)
            continue;

        *tracked_method = rt->tracked_methods[i].name;
        del_tracked_method(rt, i);
        break;
    }

    return 0;
}

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static void free_tracked_methods(RTMPContext *rt)
{
    int i;

    for (i = 0; i < rt->nb_tracked_methods; i ++)
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        av_freep(&rt->tracked_methods[i].name);
    av_freep(&rt->tracked_methods);
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    rt->tracked_methods_size = 0;
    rt->nb_tracked_methods   = 0;
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}

static int rtmp_send_packet(RTMPContext *rt, RTMPPacket *pkt, int track)
{
    int ret;

    if (pkt->type == RTMP_PT_INVOKE && track) {
        GetByteContext gbc;
        char name[128];
        double pkt_id;
        int len;

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        bytestream2_init(&gbc, pkt->data, pkt->size);
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        if ((ret = ff_amf_read_string(&gbc, name, sizeof(name), &len)) < 0)
            goto fail;

        if ((ret = ff_amf_read_number(&gbc, &pkt_id)) < 0)
            goto fail;

        if ((ret = add_tracked_method(rt, name, pkt_id)) < 0)
            goto fail;
    }

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    ret = ff_rtmp_packet_write(rt->stream, pkt, rt->out_chunk_size,
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                               &rt->prev_pkt[1], &rt->nb_prev_pkt[1]);
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fail:
    ff_rtmp_packet_destroy(pkt);
    return ret;
}

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static int rtmp_write_amf_data(URLContext *s, char *param, uint8_t **p)
{
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    char *field, *value;
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    char type;

    /* The type must be B for Boolean, N for number, S for string, O for
     * object, or Z for null. For Booleans the data must be either 0 or 1 for
     * FALSE or TRUE, respectively. Likewise for Objects the data must be
     * 0 or 1 to end or begin an object, respectively. Data items in subobjects
     * may be named, by prefixing the type with 'N' and specifying the name
     * before the value (ie. NB:myFlag:1). This option may be used multiple times
     * to construct arbitrary AMF sequences. */
    if (param[0] && param[1] == ':') {
        type = param[0];
        value = param + 2;
    } else if (param[0] == 'N' && param[1] && param[2] == ':') {
        type = param[1];
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        field = param + 3;
        value = strchr(field, ':');
        if (!value)
            goto fail;
        *value = '\0';
        value++;
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        ff_amf_write_field_name(p, field);
    } else {
        goto fail;
    }

    switch (type) {
    case 'B':
        ff_amf_write_bool(p, value[0] != '0');
        break;
    case 'S':
        ff_amf_write_string(p, value);
        break;
    case 'N':
        ff_amf_write_number(p, strtod(value, NULL));
        break;
    case 'Z':
        ff_amf_write_null(p);
        break;
    case 'O':
        if (value[0] != '0')
            ff_amf_write_object_start(p);
        else
            ff_amf_write_object_end(p);
        break;
    default:
        goto fail;
        break;
    }

    return 0;

fail:
    av_log(s, AV_LOG_ERROR, "Invalid AMF parameter: %s\n", param);
    return AVERROR(EINVAL);
}

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/**
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 * Generate 'connect' call and send it to the server.
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 */
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static int gen_connect(URLContext *s, RTMPContext *rt)
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{
    RTMPPacket pkt;
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    uint8_t *p;
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    int ret;

    if ((ret = ff_rtmp_packet_create(&pkt, RTMP_SYSTEM_CHANNEL, RTMP_PT_INVOKE,
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                                     0, 4096 + APP_MAX_LENGTH)) < 0)
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        return ret;
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    p = pkt.data;

    ff_amf_write_string(&p, "connect");
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    ff_amf_write_number(&p, ++rt->nb_invokes);
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    ff_amf_write_object_start(&p);
    ff_amf_write_field_name(&p, "app");
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    ff_amf_write_string2(&p, rt->app, rt->auth_params);
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    if (!rt->is_input) {
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        ff_amf_write_field_name(&p, "type");
        ff_amf_write_string(&p, "nonprivate");
    }
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    ff_amf_write_field_name(&p, "flashVer");
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    ff_amf_write_string(&p, rt->flashver);
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    if (rt->swfurl || rt->swfverify) {
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        ff_amf_write_field_name(&p, "swfUrl");
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        if (rt->swfurl)
            ff_amf_write_string(&p, rt->swfurl);
        else
            ff_amf_write_string(&p, rt->swfverify);
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    }

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    ff_amf_write_field_name(&p, "tcUrl");
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    ff_amf_write_string2(&p, rt->tcurl, rt->auth_params);
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    if (rt->is_input) {
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        ff_amf_write_field_name(&p, "fpad");
        ff_amf_write_bool(&p, 0);
        ff_amf_write_field_name(&p, "capabilities");
        ff_amf_write_number(&p, 15.0);
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        /* Tell the server we support all the audio codecs except
         * SUPPORT_SND_INTEL (0x0008) and SUPPORT_SND_UNUSED (0x0010)
         * which are unused in the RTMP protocol implementation. */
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        ff_amf_write_field_name(&p, "audioCodecs");
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        ff_amf_write_number(&p, 4071.0);
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        ff_amf_write_field_name(&p, "videoCodecs");
        ff_amf_write_number(&p, 252.0);
        ff_amf_write_field_name(&p, "videoFunction");
        ff_amf_write_number(&p, 1.0);
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        if (rt->pageurl) {
            ff_amf_write_field_name(&p, "pageUrl");
            ff_amf_write_string(&p, rt->pageurl);
        }
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    }
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    ff_amf_write_object_end(&p);

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    if (rt->conn) {
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        char *param = rt->conn;
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        // Write arbitrary AMF data to the Connect message.
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        while (param) {
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            char *sep;
            param += strspn(param, " ");
            if (!*param)
                break;
            sep = strchr(param, ' ');
            if (sep)
                *sep = '\0';
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            if ((ret = rtmp_write_amf_data(s, param, &p)) < 0) {
                // Invalid AMF parameter.
                ff_rtmp_packet_destroy(&pkt);
                return ret;
            }

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            if (sep)
                param = sep + 1;
            else
                break;
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        }
    }

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    pkt.size = p - pkt.data;
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    return rtmp_send_packet(rt, &pkt, 1);
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}

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#define RTMP_CTRL_ABORT_MESSAGE  (2)

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static int read_connect(URLContext *s, RTMPContext *rt)
{
    RTMPPacket pkt = { 0 };
    uint8_t *p;
    const uint8_t *cp;
    int ret;
    char command[64];
    int stringlen;
    double seqnum;
    uint8_t tmpstr[256];
    GetByteContext gbc;

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    // handle RTMP Protocol Control Messages
    for (;;) {
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        if ((ret = ff_rtmp_packet_read(rt->stream, &pkt, rt->in_chunk_size,
                                       &rt->prev_pkt[0], &rt->nb_prev_pkt[0])) < 0)
            return ret;
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#ifdef DEBUG
        ff_rtmp_packet_dump(s, &pkt);
#endif
        if (pkt.type == RTMP_PT_CHUNK_SIZE) {
            if ((ret = handle_chunk_size(s, &pkt)) < 0) {
                ff_rtmp_packet_destroy(&pkt);
                return ret;
            }
        } else if (pkt.type == RTMP_CTRL_ABORT_MESSAGE) {
            av_log(s, AV_LOG_ERROR, "received abort message\n");
            ff_rtmp_packet_destroy(&pkt);
            return AVERROR_UNKNOWN;
        } else if (pkt.type == RTMP_PT_BYTES_READ) {
            av_log(s, AV_LOG_TRACE, "received acknowledgement\n");
        } else if (pkt.type == RTMP_PT_SERVER_BW) {
            if ((ret = handle_server_bw(s, &pkt)) < 0) {
                ff_rtmp_packet_destroy(&pkt);
                return ret;
            }
        } else if (pkt.type == RTMP_PT_CLIENT_BW) {
            if ((ret = handle_client_bw(s, &pkt)) < 0) {
                ff_rtmp_packet_destroy(&pkt);
                return ret;
            }
        } else if (pkt.type == RTMP_PT_INVOKE) {
            // received RTMP Command Message
            break;
        } else {
            av_log(s, AV_LOG_ERROR, "Unknown control message type (%d)\n", pkt.type);
        }
        ff_rtmp_packet_destroy(&pkt);
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    }

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    cp = pkt.data;
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    bytestream2_init(&gbc, cp, pkt.size);
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    if (ff_amf_read_string(&gbc, command, sizeof(command), &stringlen)) {
        av_log(s, AV_LOG_ERROR, "Unable to read command string\n");
        ff_rtmp_packet_destroy(&pkt);
        return AVERROR_INVALIDDATA;
    }
    if (strcmp(command, "connect")) {
        av_log(s, AV_LOG_ERROR, "Expecting connect, got %s\n", command);
        ff_rtmp_packet_destroy(&pkt);
        return AVERROR_INVALIDDATA;
    }
    ret = ff_amf_read_number(&gbc, &seqnum);
    if (ret)
        av_log(s, AV_LOG_WARNING, "SeqNum not found\n");
    /* Here one could parse an AMF Object with data as flashVers and others. */
    ret = ff_amf_get_field_value(gbc.buffer,
                                 gbc.buffer + bytestream2_get_bytes_left(&gbc),
                                 "app", tmpstr, sizeof(tmpstr));
    if (ret)
        av_log(s, AV_LOG_WARNING, "App field not found in connect\n");
    if (!ret && strcmp(tmpstr, rt->app))
        av_log(s, AV_LOG_WARNING, "App field don't match up: %s <-> %s\n",
               tmpstr, rt->app);
    ff_rtmp_packet_destroy(&pkt);

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    // Send Window Acknowledgement Size (as defined in specification)
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    if ((ret = ff_rtmp_packet_create(&pkt, RTMP_NETWORK_CHANNEL,
                                     RTMP_PT_SERVER_BW, 0, 4)) < 0)
        return ret;
    p = pkt.data;
    bytestream_put_be32(&p, rt->server_bw);
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    pkt.size = p - pkt.data;
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    ret = ff_rtmp_packet_write(rt->stream, &pkt, rt->out_chunk_size,
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                               &rt->prev_pkt[1], &rt->nb_prev_pkt[1]);
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    ff_rtmp_packet_destroy(&pkt);
    if (ret < 0)
        return ret;
    // Send Peer Bandwidth
    if ((ret = ff_rtmp_packet_create(&pkt, RTMP_NETWORK_CHANNEL,
                                     RTMP_PT_CLIENT_BW, 0, 5)) < 0)
        return ret;
    p = pkt.data;
    bytestream_put_be32(&p, rt->server_bw);
    bytestream_put_byte(&p, 2); // dynamic
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    pkt.size = p - pkt.data;
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    ret = ff_rtmp_packet_write(rt->stream, &pkt, rt->out_chunk_size,
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                               &rt->prev_pkt[1], &rt->nb_prev_pkt[1]);
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    ff_rtmp_packet_destroy(&pkt);
    if (ret < 0)
        return ret;

    // Ping request
    if ((ret = ff_rtmp_packet_create(&pkt, RTMP_NETWORK_CHANNEL,
                                     RTMP_PT_PING, 0, 6)) < 0)
        return ret;

    p = pkt.data;
    bytestream_put_be16(&p, 0); // 0 -> Stream Begin
    bytestream_put_be32(&p, 0);
    ret = ff_rtmp_packet_write(rt->stream, &pkt, rt->out_chunk_size,
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                               &rt->prev_pkt[1], &rt->nb_prev_pkt[1]);
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    ff_rtmp_packet_destroy(&pkt);
    if (ret < 0)
        return ret;

    // Chunk size
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    if ((ret = ff_rtmp_packet_create(&pkt, RTMP_NETWORK_CHANNEL,
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                                     RTMP_PT_CHUNK_SIZE, 0, 4)) < 0)
        return ret;

    p = pkt.data;
    bytestream_put_be32(&p, rt->out_chunk_size);
    ret = ff_rtmp_packet_write(rt->stream, &pkt, rt->out_chunk_size,
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                               &rt->prev_pkt[1], &rt->nb_prev_pkt[1]);
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    ff_rtmp_packet_destroy(&pkt);
    if (ret < 0)
        return ret;

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    // Send _result NetConnection.Connect.Success to connect
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    if ((ret = ff_rtmp_packet_create(&pkt, RTMP_SYSTEM_CHANNEL,
                                     RTMP_PT_INVOKE, 0,
                                     RTMP_PKTDATA_DEFAULT_SIZE)) < 0)
        return ret;

    p = pkt.data;
    ff_amf_write_string(&p, "_result");
    ff_amf_write_number(&p, seqnum);

    ff_amf_write_object_start(&p);
    ff_amf_write_field_name(&p, "fmsVer");
    ff_amf_write_string(&p, "FMS/3,0,1,123");
    ff_amf_write_field_name(&p, "capabilities");
    ff_amf_write_number(&p, 31);
    ff_amf_write_object_end(&p);

    ff_amf_write_object_start(&p);
    ff_amf_write_field_name(&p, "level");
    ff_amf_write_string(&p, "status");
    ff_amf_write_field_name(&p, "code");
    ff_amf_write_string(&p, "NetConnection.Connect.Success");
    ff_amf_write_field_name(&p, "description");
    ff_amf_write_string(&p, "Connection succeeded.");
    ff_amf_write_field_name(&p, "objectEncoding");
    ff_amf_write_number(&p, 0);
    ff_amf_write_object_end(&p);

567
    pkt.size = p - pkt.data;
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    ret = ff_rtmp_packet_write(rt->stream, &pkt, rt->out_chunk_size,
569
                               &rt->prev_pkt[1], &rt->nb_prev_pkt[1]);
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    ff_rtmp_packet_destroy(&pkt);
    if (ret < 0)
        return ret;

    if ((ret = ff_rtmp_packet_create(&pkt, RTMP_SYSTEM_CHANNEL,
                                     RTMP_PT_INVOKE, 0, 30)) < 0)
        return ret;
    p = pkt.data;
    ff_amf_write_string(&p, "onBWDone");
    ff_amf_write_number(&p, 0);
    ff_amf_write_null(&p);
    ff_amf_write_number(&p, 8192);
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    pkt.size = p - pkt.data;
583
    ret = ff_rtmp_packet_write(rt->stream, &pkt, rt->out_chunk_size,
584
                               &rt->prev_pkt[1], &rt->nb_prev_pkt[1]);
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    ff_rtmp_packet_destroy(&pkt);

    return ret;
}

590
/**
591
 * Generate 'releaseStream' call and send it to the server. It should make
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 * the server release some channel for media streams.
 */
594
static int gen_release_stream(URLContext *s, RTMPContext *rt)
595 596 597
{
    RTMPPacket pkt;
    uint8_t *p;
598
    int ret;
599

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    if ((ret = ff_rtmp_packet_create(&pkt, RTMP_SYSTEM_CHANNEL, RTMP_PT_INVOKE,
                                     0, 29 + strlen(rt->playpath))) < 0)
        return ret;
603

604
    av_log(s, AV_LOG_DEBUG, "Releasing stream...\n");
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    p = pkt.data;
    ff_amf_write_string(&p, "releaseStream");
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    ff_amf_write_number(&p, ++rt->nb_invokes);
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    ff_amf_write_null(&p);
    ff_amf_write_string(&p, rt->playpath);

611
    return rtmp_send_packet(rt, &pkt, 1);
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}

/**
615
 * Generate 'FCPublish' call and send it to the server. It should make
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 * the server prepare for receiving media streams.
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 */
618
static int gen_fcpublish_stream(URLContext *s, RTMPContext *rt)
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{
    RTMPPacket pkt;
    uint8_t *p;
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    int ret;
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    if ((ret = ff_rtmp_packet_create(&pkt, RTMP_SYSTEM_CHANNEL, RTMP_PT_INVOKE,
                                     0, 25 + strlen(rt->playpath))) < 0)
        return ret;
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628
    av_log(s, AV_LOG_DEBUG, "FCPublish stream...\n");
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    p = pkt.data;
    ff_amf_write_string(&p, "FCPublish");
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    ff_amf_write_number(&p, ++rt->nb_invokes);
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    ff_amf_write_null(&p);
    ff_amf_write_string(&p, rt->playpath);

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    return rtmp_send_packet(rt, &pkt, 1);
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}

/**
639
 * Generate 'FCUnpublish' call and send it to the server. It should make
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 * the server destroy stream.
 */
642
static int gen_fcunpublish_stream(URLContext *s, RTMPContext *rt)
643 644 645
{
    RTMPPacket pkt;
    uint8_t *p;
646
    int ret;
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    if ((ret = ff_rtmp_packet_create(&pkt, RTMP_SYSTEM_CHANNEL, RTMP_PT_INVOKE,
                                     0, 27 + strlen(rt->playpath))) < 0)
        return ret;
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652
    av_log(s, AV_LOG_DEBUG, "UnPublishing stream...\n");
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    p = pkt.data;
    ff_amf_write_string(&p, "FCUnpublish");
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    ff_amf_write_number(&p, ++rt->nb_invokes);
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    ff_amf_write_null(&p);
    ff_amf_write_string(&p, rt->playpath);

659
    return rtmp_send_packet(rt, &pkt, 0);
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}

662
/**
663
 * Generate 'createStream' call and send it to the server. It should make
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 * the server allocate some channel for media streams.
 */
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static int gen_create_stream(URLContext *s, RTMPContext *rt)
667 668 669
{
    RTMPPacket pkt;
    uint8_t *p;
670
    int ret;
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672
    av_log(s, AV_LOG_DEBUG, "Creating stream...\n");
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    if ((ret = ff_rtmp_packet_create(&pkt, RTMP_SYSTEM_CHANNEL, RTMP_PT_INVOKE,
                                     0, 25)) < 0)
        return ret;
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    p = pkt.data;
    ff_amf_write_string(&p, "createStream");
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    ff_amf_write_number(&p, ++rt->nb_invokes);
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    ff_amf_write_null(&p);

683
    return rtmp_send_packet(rt, &pkt, 1);
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}


/**
688
 * Generate 'deleteStream' call and send it to the server. It should make
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 * the server remove some channel for media streams.
 */
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static int gen_delete_stream(URLContext *s, RTMPContext *rt)
692 693 694
{
    RTMPPacket pkt;
    uint8_t *p;
695
    int ret;
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697
    av_log(s, AV_LOG_DEBUG, "Deleting stream...\n");
698 699 700 701

    if ((ret = ff_rtmp_packet_create(&pkt, RTMP_SYSTEM_CHANNEL, RTMP_PT_INVOKE,
                                     0, 34)) < 0)
        return ret;
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    p = pkt.data;
    ff_amf_write_string(&p, "deleteStream");
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    ff_amf_write_number(&p, ++rt->nb_invokes);
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    ff_amf_write_null(&p);
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    ff_amf_write_number(&p, rt->stream_id);
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709
    return rtmp_send_packet(rt, &pkt, 0);
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}

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/**
 * Generate 'getStreamLength' call and send it to the server. If the server
 * knows the duration of the selected stream, it will reply with the duration
 * in seconds.
 */
static int gen_get_stream_length(URLContext *s, RTMPContext *rt)
{
    RTMPPacket pkt;
    uint8_t *p;
    int ret;

    if ((ret = ff_rtmp_packet_create(&pkt, RTMP_SOURCE_CHANNEL, RTMP_PT_INVOKE,
                                     0, 31 + strlen(rt->playpath))) < 0)
        return ret;

    p = pkt.data;
    ff_amf_write_string(&p, "getStreamLength");
    ff_amf_write_number(&p, ++rt->nb_invokes);
    ff_amf_write_null(&p);
    ff_amf_write_string(&p, rt->playpath);

    return rtmp_send_packet(rt, &pkt, 1);
}

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/**
 * Generate client buffer time and send it to the server.
 */
static int gen_buffer_time(URLContext *s, RTMPContext *rt)
{
    RTMPPacket pkt;
    uint8_t *p;
    int ret;

    if ((ret = ff_rtmp_packet_create(&pkt, RTMP_NETWORK_CHANNEL, RTMP_PT_PING,
                                     1, 10)) < 0)
        return ret;

    p = pkt.data;
    bytestream_put_be16(&p, 3);
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    bytestream_put_be32(&p, rt->stream_id);
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    bytestream_put_be32(&p, rt->client_buffer_time);

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    return rtmp_send_packet(rt, &pkt, 0);
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}

757
/**
758
 * Generate 'play' call and send it to the server, then ping the server
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 * to start actual playing.
 */
761
static int gen_play(URLContext *s, RTMPContext *rt)
762 763 764
{
    RTMPPacket pkt;
    uint8_t *p;
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    int ret;
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767
    av_log(s, AV_LOG_DEBUG, "Sending play command for '%s'\n", rt->playpath);
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769
    if ((ret = ff_rtmp_packet_create(&pkt, RTMP_SOURCE_CHANNEL, RTMP_PT_INVOKE,
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                                     0, 29 + strlen(rt->playpath))) < 0)
        return ret;

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    pkt.extra = rt->stream_id;
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    p = pkt.data;
    ff_amf_write_string(&p, "play");
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    ff_amf_write_number(&p, ++rt->nb_invokes);
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    ff_amf_write_null(&p);
    ff_amf_write_string(&p, rt->playpath);
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    ff_amf_write_number(&p, rt->live * 1000);
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782
    return rtmp_send_packet(rt, &pkt, 1);
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}

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static int gen_seek(URLContext *s, RTMPContext *rt, int64_t timestamp)
{
    RTMPPacket pkt;
    uint8_t *p;
    int ret;

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    av_log(s, AV_LOG_DEBUG, "Sending seek command for timestamp %"PRId64"\n",
           timestamp);
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    if ((ret = ff_rtmp_packet_create(&pkt, 3, RTMP_PT_INVOKE, 0, 26)) < 0)
        return ret;

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    pkt.extra = rt->stream_id;
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    p = pkt.data;
    ff_amf_write_string(&p, "seek");
    ff_amf_write_number(&p, 0); //no tracking back responses
    ff_amf_write_null(&p); //as usual, the first null param
    ff_amf_write_number(&p, timestamp); //where we want to jump

    return rtmp_send_packet(rt, &pkt, 1);
}

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/**
 * Generate a pause packet that either pauses or unpauses the current stream.
 */
static int gen_pause(URLContext *s, RTMPContext *rt, int pause, uint32_t timestamp)
{
    RTMPPacket pkt;
    uint8_t *p;
    int ret;

    av_log(s, AV_LOG_DEBUG, "Sending pause command for timestamp %d\n",
           timestamp);

    if ((ret = ff_rtmp_packet_create(&pkt, 3, RTMP_PT_INVOKE, 0, 29)) < 0)
        return ret;

    pkt.extra = rt->stream_id;

    p = pkt.data;
    ff_amf_write_string(&p, "pause");
    ff_amf_write_number(&p, 0); //no tracking back responses
    ff_amf_write_null(&p); //as usual, the first null param
    ff_amf_write_bool(&p, pause); // pause or unpause
    ff_amf_write_number(&p, timestamp); //where we pause the stream

    return rtmp_send_packet(rt, &pkt, 1);
}

835
/**
836
 * Generate 'publish' call and send it to the server.
837
 */
838
static int gen_publish(URLContext *s, RTMPContext *rt)
839 840 841
{
    RTMPPacket pkt;
    uint8_t *p;
842
    int ret;
843

844
    av_log(s, AV_LOG_DEBUG, "Sending publish command for '%s'\n", rt->playpath);
845 846 847 848 849

    if ((ret = ff_rtmp_packet_create(&pkt, RTMP_SOURCE_CHANNEL, RTMP_PT_INVOKE,
                                     0, 30 + strlen(rt->playpath))) < 0)
        return ret;

850
    pkt.extra = rt->stream_id;
851 852 853

    p = pkt.data;
    ff_amf_write_string(&p, "publish");
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    ff_amf_write_number(&p, ++rt->nb_invokes);
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    ff_amf_write_null(&p);
    ff_amf_write_string(&p, rt->playpath);
    ff_amf_write_string(&p, "live");

859
    return rtmp_send_packet(rt, &pkt, 1);
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}

862
/**
863
 * Generate ping reply and send it to the server.
864
 */
865
static int gen_pong(URLContext *s, RTMPContext *rt, RTMPPacket *ppkt)
866 867 868
{
    RTMPPacket pkt;
    uint8_t *p;
869 870
    int ret;

871
    if (ppkt->size < 6) {
872
        av_log(s, AV_LOG_ERROR, "Too short ping packet (%d)\n",
873
               ppkt->size);
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        return AVERROR_INVALIDDATA;
    }

877 878 879
    if ((ret = ff_rtmp_packet_create(&pkt, RTMP_NETWORK_CHANNEL, RTMP_PT_PING,
                                     ppkt->timestamp + 1, 6)) < 0)
        return ret;
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    p = pkt.data;
    bytestream_put_be16(&p, 7);
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    bytestream_put_be32(&p, AV_RB32(ppkt->data+2));
884

885
    return rtmp_send_packet(rt, &pkt, 0);
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}

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/**
 * Generate SWF verification message and send it to the server.
 */
static int gen_swf_verification(URLContext *s, RTMPContext *rt)
{
    RTMPPacket pkt;
    uint8_t *p;
    int ret;

    av_log(s, AV_LOG_DEBUG, "Sending SWF verification...\n");
    if ((ret = ff_rtmp_packet_create(&pkt, RTMP_NETWORK_CHANNEL, RTMP_PT_PING,
                                     0, 44)) < 0)
        return ret;

    p = pkt.data;
    bytestream_put_be16(&p, 27);
    memcpy(p, rt->swfverification, 42);

    return rtmp_send_packet(rt, &pkt, 0);
}

909 910 911
/**
 * Generate server bandwidth message and send it to the server.
 */
912
static int gen_server_bw(URLContext *s, RTMPContext *rt)
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{
    RTMPPacket pkt;
    uint8_t *p;
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    int ret;

    if ((ret = ff_rtmp_packet_create(&pkt, RTMP_NETWORK_CHANNEL, RTMP_PT_SERVER_BW,
                                     0, 4)) < 0)
        return ret;
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    p = pkt.data;
923
    bytestream_put_be32(&p, rt->server_bw);
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925
    return rtmp_send_packet(rt, &pkt, 0);
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}

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/**
 * Generate check bandwidth message and send it to the server.
 */
931
static int gen_check_bw(URLContext *s, RTMPContext *rt)
932 933 934
{
    RTMPPacket pkt;
    uint8_t *p;
935
    int ret;
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937 938 939
    if ((ret = ff_rtmp_packet_create(&pkt, RTMP_SYSTEM_CHANNEL, RTMP_PT_INVOKE,
                                     0, 21)) < 0)
        return ret;
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    p = pkt.data;
    ff_amf_write_string(&p, "_checkbw");
943
    ff_amf_write_number(&p, ++rt->nb_invokes);
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    ff_amf_write_null(&p);

946
    return rtmp_send_packet(rt, &pkt, 1);
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}

949
/**
950
 * Generate report on bytes read so far and send it to the server.
951
 */
952
static int gen_bytes_read(URLContext *s, RTMPContext *rt, uint32_t ts)
953 954 955
{
    RTMPPacket pkt;
    uint8_t *p;
956 957 958 959 960
    int ret;

    if ((ret = ff_rtmp_packet_create(&pkt, RTMP_NETWORK_CHANNEL, RTMP_PT_BYTES_READ,
                                     ts, 4)) < 0)
        return ret;
961 962 963

    p = pkt.data;
    bytestream_put_be32(&p, rt->bytes_read);
964

965
    return rtmp_send_packet(rt, &pkt, 0);
966 967
}

968 969
static int gen_fcsubscribe_stream(URLContext *s, RTMPContext *rt,
                                  const char *subscribe)
970 971 972 973 974 975
{
    RTMPPacket pkt;
    uint8_t *p;
    int ret;

    if ((ret = ff_rtmp_packet_create(&pkt, RTMP_SYSTEM_CHANNEL, RTMP_PT_INVOKE,
976
                                     0, 27 + strlen(subscribe))) < 0)
977 978 979 980 981 982
        return ret;

    p = pkt.data;
    ff_amf_write_string(&p, "FCSubscribe");
    ff_amf_write_number(&p, ++rt->nb_invokes);
    ff_amf_write_null(&p);
983
    ff_amf_write_string(&p, subscribe);
984

985
    return rtmp_send_packet(rt, &pkt, 1);
986 987
}

988 989
int ff_rtmp_calc_digest(const uint8_t *src, int len, int gap,
                        const uint8_t *key, int keylen, uint8_t *dst)
990
{
991
    AVHMAC *hmac;
992

993 994
    hmac = av_hmac_alloc(AV_HMAC_SHA256);
    if (!hmac)
995
        return AVERROR(ENOMEM);
996

997
    av_hmac_init(hmac, key, keylen);
998
    if (gap <= 0) {
999
        av_hmac_update(hmac, src, len);
1000
    } else { //skip 32 bytes used for storing digest
1001 1002
        av_hmac_update(hmac, src, gap);
        av_hmac_update(hmac, src + gap + 32, len - gap - 32);
1003
    }
1004
    av_hmac_final(hmac, dst, 32);
1005

1006
    av_hmac_free(hmac);
1007 1008

    return 0;
1009 1010
}

1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022
int ff_rtmp_calc_digest_pos(const uint8_t *buf, int off, int mod_val,
                            int add_val)
{
    int i, digest_pos = 0;

    for (i = 0; i < 4; i++)
        digest_pos += buf[i + off];
    digest_pos = digest_pos % mod_val + add_val;

    return digest_pos;
}

1023
/**
1024
 * Put HMAC-SHA2 digest of packet data (except for the bytes where this digest
1025 1026 1027
 * will be stored) into that packet.
 *
 * @param buf handshake data (1536 bytes)
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1028
 * @param encrypted use an encrypted connection (RTMPE)
1029 1030
 * @return offset to the digest inside input data
 */
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1031
static int rtmp_handshake_imprint_with_digest(uint8_t *buf, int encrypted)
1032
{
1033
    int ret, digest_pos;
1034

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1035 1036 1037 1038
    if (encrypted)
        digest_pos = ff_rtmp_calc_digest_pos(buf, 772, 728, 776);
    else
        digest_pos = ff_rtmp_calc_digest_pos(buf, 8, 728, 12);
1039

1040 1041 1042
    ret = ff_rtmp_calc_digest(buf, RTMP_HANDSHAKE_PACKET_SIZE, digest_pos,
                              rtmp_player_key, PLAYER_KEY_OPEN_PART_LEN,
                              buf + digest_pos);
1043 1044 1045
    if (ret < 0)
        return ret;

1046 1047 1048 1049
    return digest_pos;
}

/**
1050
 * Verify that the received server response has the expected digest value.
1051 1052 1053 1054 1055 1056 1057 1058
 *
 * @param buf handshake data received from the server (1536 bytes)
 * @param off position to search digest offset from
 * @return 0 if digest is valid, digest position otherwise
 */
static int rtmp_validate_digest(uint8_t *buf, int off)
{
    uint8_t digest[32];
1059
    int ret, digest_pos;
1060

1061
    digest_pos = ff_rtmp_calc_digest_pos(buf, off, 728, off + 4);
1062

1063 1064 1065
    ret = ff_rtmp_calc_digest(buf, RTMP_HANDSHAKE_PACKET_SIZE, digest_pos,
                              rtmp_server_key, SERVER_KEY_OPEN_PART_LEN,
                              digest);
1066 1067 1068
    if (ret < 0)
        return ret;

1069 1070 1071 1072 1073
    if (!memcmp(digest, buf + digest_pos, 32))
        return digest_pos;
    return 0;
}

1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097
static int rtmp_calc_swf_verification(URLContext *s, RTMPContext *rt,
                                      uint8_t *buf)
{
    uint8_t *p;
    int ret;

    if (rt->swfhash_len != 32) {
        av_log(s, AV_LOG_ERROR,
               "Hash of the decompressed SWF file is not 32 bytes long.\n");
        return AVERROR(EINVAL);
    }

    p = &rt->swfverification[0];
    bytestream_put_byte(&p, 1);
    bytestream_put_byte(&p, 1);
    bytestream_put_be32(&p, rt->swfsize);
    bytestream_put_be32(&p, rt->swfsize);

    if ((ret = ff_rtmp_calc_digest(rt->swfhash, 32, 0, buf, 32, p)) < 0)
        return ret;

    return 0;
}

1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145
#if CONFIG_ZLIB
static int rtmp_uncompress_swfplayer(uint8_t *in_data, int64_t in_size,
                                     uint8_t **out_data, int64_t *out_size)
{
    z_stream zs = { 0 };
    void *ptr;
    int size;
    int ret = 0;

    zs.avail_in = in_size;
    zs.next_in  = in_data;
    ret = inflateInit(&zs);
    if (ret != Z_OK)
        return AVERROR_UNKNOWN;

    do {
        uint8_t tmp_buf[16384];

        zs.avail_out = sizeof(tmp_buf);
        zs.next_out  = tmp_buf;

        ret = inflate(&zs, Z_NO_FLUSH);
        if (ret != Z_OK && ret != Z_STREAM_END) {
            ret = AVERROR_UNKNOWN;
            goto fail;
        }

        size = sizeof(tmp_buf) - zs.avail_out;
        if (!(ptr = av_realloc(*out_data, *out_size + size))) {
            ret = AVERROR(ENOMEM);
            goto fail;
        }
        *out_data = ptr;

        memcpy(*out_data + *out_size, tmp_buf, size);
        *out_size += size;
    } while (zs.avail_out == 0);

fail:
    inflateEnd(&zs);
    return ret;
}
#endif

static int rtmp_calc_swfhash(URLContext *s)
{
    RTMPContext *rt = s->priv_data;
    uint8_t *in_data = NULL, *out_data = NULL, *swfdata;
1146
    int64_t in_size;
1147 1148 1149 1150 1151 1152
    URLContext *stream;
    char swfhash[32];
    int swfsize;
    int ret = 0;

    /* Get the SWF player file. */
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    if ((ret = ffurl_open_whitelist(&stream, rt->swfverify, AVIO_FLAG_READ,
                                    &s->interrupt_callback, NULL,
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                                    s->protocol_whitelist, s->protocol_blacklist, s)) < 0) {
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        av_log(s, AV_LOG_ERROR, "Cannot open connection %s.\n", rt->swfverify);
        goto fail;
    }

    if ((in_size = ffurl_seek(stream, 0, AVSEEK_SIZE)) < 0) {
        ret = AVERROR(EIO);
        goto fail;
    }

    if (!(in_data = av_malloc(in_size))) {
        ret = AVERROR(ENOMEM);
        goto fail;
    }

    if ((ret = ffurl_read_complete(stream, in_data, in_size)) < 0)
        goto fail;

    if (in_size < 3) {
        ret = AVERROR_INVALIDDATA;
        goto fail;
    }

    if (!memcmp(in_data, "CWS", 3)) {
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#if CONFIG_ZLIB
        int64_t out_size;
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        /* Decompress the SWF player file using Zlib. */
        if (!(out_data = av_malloc(8))) {
            ret = AVERROR(ENOMEM);
            goto fail;
        }
        *in_data = 'F'; // magic stuff
        memcpy(out_data, in_data, 8);
        out_size = 8;

        if ((ret = rtmp_uncompress_swfplayer(in_data + 8, in_size - 8,
                                             &out_data, &out_size)) < 0)
            goto fail;
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        swfsize = out_size;
        swfdata = out_data;
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#else
        av_log(s, AV_LOG_ERROR,
               "Zlib is required for decompressing the SWF player file.\n");
        ret = AVERROR(EINVAL);
        goto fail;
#endif
    } else {
        swfsize = in_size;
        swfdata = in_data;
    }

    /* Compute the SHA256 hash of the SWF player file. */
    if ((ret = ff_rtmp_calc_digest(swfdata, swfsize, 0,
                                   "Genuine Adobe Flash Player 001", 30,
                                   swfhash)) < 0)
        goto fail;

    /* Set SWFVerification parameters. */
    av_opt_set_bin(rt, "rtmp_swfhash", swfhash, 32, 0);
    rt->swfsize = swfsize;

fail:
    av_freep(&in_data);
    av_freep(&out_data);
    ffurl_close(stream);
    return ret;
}

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/**
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 * Perform handshake with the server by means of exchanging pseudorandom data
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 * signed with HMAC-SHA2 digest.
 *
 * @return 0 if handshake succeeds, negative value otherwise
 */
static int rtmp_handshake(URLContext *s, RTMPContext *rt)
{
    AVLFG rnd;
    uint8_t tosend    [RTMP_HANDSHAKE_PACKET_SIZE+1] = {
        3,                // unencrypted data
        0, 0, 0, 0,       // client uptime
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        RTMP_CLIENT_VER1,
        RTMP_CLIENT_VER2,
        RTMP_CLIENT_VER3,
        RTMP_CLIENT_VER4,
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    };
    uint8_t clientdata[RTMP_HANDSHAKE_PACKET_SIZE];
    uint8_t serverdata[RTMP_HANDSHAKE_PACKET_SIZE+1];
    int i;
    int server_pos, client_pos;
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    uint8_t digest[32], signature[32];
    int ret, type = 0;
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    av_log(s, AV_LOG_DEBUG, "Handshaking...\n");
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    av_lfg_init(&rnd, 0xDEADC0DE);
    // generate handshake packet - 1536 bytes of pseudorandom data
    for (i = 9; i <= RTMP_HANDSHAKE_PACKET_SIZE; i++)
        tosend[i] = av_lfg_get(&rnd) >> 24;
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    if (CONFIG_FFRTMPCRYPT_PROTOCOL && rt->encrypted) {
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        /* When the client wants to use RTMPE, we have to change the command
         * byte to 0x06 which means to use encrypted data and we have to set
         * the flash version to at least 9.0.115.0. */
        tosend[0] = 6;
        tosend[5] = 128;
        tosend[6] = 0;
        tosend[7] = 3;
        tosend[8] = 2;

        /* Initialize the Diffie-Hellmann context and generate the public key
         * to send to the server. */
        if ((ret = ff_rtmpe_gen_pub_key(rt->stream, tosend + 1)) < 0)
            return ret;
    }

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    client_pos = rtmp_handshake_imprint_with_digest(tosend + 1, rt->encrypted);
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    if (client_pos < 0)
        return client_pos;
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    if ((ret = ffurl_write(rt->stream, tosend,
                           RTMP_HANDSHAKE_PACKET_SIZE + 1)) < 0) {
        av_log(s, AV_LOG_ERROR, "Cannot write RTMP handshake request\n");
        return ret;
    }

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    if ((ret = ffurl_read_complete(rt->stream, serverdata,
                                   RTMP_HANDSHAKE_PACKET_SIZE + 1)) < 0) {
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        av_log(s, AV_LOG_ERROR, "Cannot read RTMP handshake response\n");
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        return ret;
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    }
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    if ((ret = ffurl_read_complete(rt->stream, clientdata,
                                   RTMP_HANDSHAKE_PACKET_SIZE)) < 0) {
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        av_log(s, AV_LOG_ERROR, "Cannot read RTMP handshake response\n");
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        return ret;
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    }

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    av_log(s, AV_LOG_DEBUG, "Type answer %d\n", serverdata[0]);
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    av_log(s, AV_LOG_DEBUG, "Server version %d.%d.%d.%d\n",
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           serverdata[5], serverdata[6], serverdata[7], serverdata[8]);

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    if (rt->is_input && serverdata[5] >= 3) {
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        server_pos = rtmp_validate_digest(serverdata + 1, 772);
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        if (server_pos < 0)
            return server_pos;

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        if (!server_pos) {
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            type = 1;
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            server_pos = rtmp_validate_digest(serverdata + 1, 8);
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            if (server_pos < 0)
                return server_pos;

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            if (!server_pos) {
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                av_log(s, AV_LOG_ERROR, "Server response validating failed\n");
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                return AVERROR(EIO);
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            }
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        }

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        /* Generate SWFVerification token (SHA256 HMAC hash of decompressed SWF,
         * key are the last 32 bytes of the server handshake. */
        if (rt->swfsize) {
            if ((ret = rtmp_calc_swf_verification(s, rt, serverdata + 1 +
                                                  RTMP_HANDSHAKE_PACKET_SIZE - 32)) < 0)
                return ret;
        }

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        ret = ff_rtmp_calc_digest(tosend + 1 + client_pos, 32, 0,
                                  rtmp_server_key, sizeof(rtmp_server_key),
                                  digest);
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        if (ret < 0)
            return ret;

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        ret = ff_rtmp_calc_digest(clientdata, RTMP_HANDSHAKE_PACKET_SIZE - 32,
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                                  0, digest, 32, signature);
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        if (ret < 0)
            return ret;

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        if (CONFIG_FFRTMPCRYPT_PROTOCOL && rt->encrypted) {
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            /* Compute the shared secret key sent by the server and initialize
             * the RC4 encryption. */
            if ((ret = ff_rtmpe_compute_secret_key(rt->stream, serverdata + 1,
                                                   tosend + 1, type)) < 0)
                return ret;

            /* Encrypt the signature received by the server. */
            ff_rtmpe_encrypt_sig(rt->stream, signature, digest, serverdata[0]);
        }

        if (memcmp(signature, clientdata + RTMP_HANDSHAKE_PACKET_SIZE - 32, 32)) {
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            av_log(s, AV_LOG_ERROR, "Signature mismatch\n");
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            return AVERROR(EIO);
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        }
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        for (i = 0; i < RTMP_HANDSHAKE_PACKET_SIZE; i++)
            tosend[i] = av_lfg_get(&rnd) >> 24;
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        ret = ff_rtmp_calc_digest(serverdata + 1 + server_pos, 32, 0,
                                  rtmp_player_key, sizeof(rtmp_player_key),
                                  digest);
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        if (ret < 0)
            return ret;

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        ret = ff_rtmp_calc_digest(tosend, RTMP_HANDSHAKE_PACKET_SIZE - 32, 0,
                                  digest, 32,
                                  tosend + RTMP_HANDSHAKE_PACKET_SIZE - 32);
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        if (ret < 0)
            return ret;
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        if (CONFIG_FFRTMPCRYPT_PROTOCOL && rt->encrypted) {
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            /* Encrypt the signature to be send to the server. */
            ff_rtmpe_encrypt_sig(rt->stream, tosend +
                                 RTMP_HANDSHAKE_PACKET_SIZE - 32, digest,
                                 serverdata[0]);
        }

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        // write reply back to the server
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        if ((ret = ffurl_write(rt->stream, tosend,
                               RTMP_HANDSHAKE_PACKET_SIZE)) < 0)
            return ret;
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        if (CONFIG_FFRTMPCRYPT_PROTOCOL && rt->encrypted) {
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            /* Set RC4 keys for encryption and update the keystreams. */
            if ((ret = ff_rtmpe_update_keystream(rt->stream)) < 0)
                return ret;
        }
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    } else {
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        if (CONFIG_FFRTMPCRYPT_PROTOCOL && rt->encrypted) {
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            /* Compute the shared secret key sent by the server and initialize
             * the RC4 encryption. */
            if ((ret = ff_rtmpe_compute_secret_key(rt->stream, serverdata + 1,
                            tosend + 1, 1)) < 0)
                return ret;

            if (serverdata[0] == 9) {
                /* Encrypt the signature received by the server. */
                ff_rtmpe_encrypt_sig(rt->stream, signature, digest,
                                     serverdata[0]);
            }
        }

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        if ((ret = ffurl_write(rt->stream, serverdata + 1,
                               RTMP_HANDSHAKE_PACKET_SIZE)) < 0)
            return ret;
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        if (CONFIG_FFRTMPCRYPT_PROTOCOL && rt->encrypted) {
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            /* Set RC4 keys for encryption and update the keystreams. */
            if ((ret = ff_rtmpe_update_keystream(rt->stream)) < 0)
                return ret;
        }
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    }

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    return 0;
}

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static int rtmp_receive_hs_packet(RTMPContext* rt, uint32_t *first_int,
                                  uint32_t *second_int, char *arraydata,
                                  int size)
{
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    int inoutsize;
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    inoutsize = ffurl_read_complete(rt->stream, arraydata,
                                    RTMP_HANDSHAKE_PACKET_SIZE);
    if (inoutsize <= 0)
        return AVERROR(EIO);
    if (inoutsize != RTMP_HANDSHAKE_PACKET_SIZE) {
        av_log(rt, AV_LOG_ERROR, "Erroneous Message size %d"
               " not following standard\n", (int)inoutsize);
        return AVERROR(EINVAL);
    }

    *first_int  = AV_RB32(arraydata);
    *second_int = AV_RB32(arraydata + 4);
    return 0;
}

static int rtmp_send_hs_packet(RTMPContext* rt, uint32_t first_int,
                               uint32_t second_int, char *arraydata, int size)
{
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    int inoutsize;
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    AV_WB32(arraydata, first_int);
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    AV_WB32(arraydata + 4, second_int);
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    inoutsize = ffurl_write(rt->stream, arraydata,
                            RTMP_HANDSHAKE_PACKET_SIZE);
    if (inoutsize != RTMP_HANDSHAKE_PACKET_SIZE) {
        av_log(rt, AV_LOG_ERROR, "Unable to write answer\n");
        return AVERROR(EIO);
    }

    return 0;
}

/**
 * rtmp handshake server side
 */
static int rtmp_server_handshake(URLContext *s, RTMPContext *rt)
{
    uint8_t buffer[RTMP_HANDSHAKE_PACKET_SIZE];
    uint32_t hs_epoch;
    uint32_t hs_my_epoch;
    uint8_t hs_c1[RTMP_HANDSHAKE_PACKET_SIZE];
    uint8_t hs_s1[RTMP_HANDSHAKE_PACKET_SIZE];
    uint32_t zeroes;
    uint32_t temp       = 0;
    int randomidx       = 0;
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    int inoutsize       = 0;
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    int ret;

    inoutsize = ffurl_read_complete(rt->stream, buffer, 1);       // Receive C0
    if (inoutsize <= 0) {
        av_log(s, AV_LOG_ERROR, "Unable to read handshake\n");
        return AVERROR(EIO);
    }
    // Check Version
    if (buffer[0] != 3) {
        av_log(s, AV_LOG_ERROR, "RTMP protocol version mismatch\n");
        return AVERROR(EIO);
    }
    if (ffurl_write(rt->stream, buffer, 1) <= 0) {                 // Send S0
        av_log(s, AV_LOG_ERROR,
               "Unable to write answer - RTMP S0\n");
        return AVERROR(EIO);
    }
    /* Receive C1 */
    ret = rtmp_receive_hs_packet(rt, &hs_epoch, &zeroes, hs_c1,
                                 RTMP_HANDSHAKE_PACKET_SIZE);
    if (ret) {
        av_log(s, AV_LOG_ERROR, "RTMP Handshake C1 Error\n");
        return ret;
    }
    /* Send S1 */
    /* By now same epoch will be sent */
    hs_my_epoch = hs_epoch;
    /* Generate random */
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    for (randomidx = 8; randomidx < (RTMP_HANDSHAKE_PACKET_SIZE);
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         randomidx += 4)
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        AV_WB32(hs_s1 + randomidx, av_get_random_seed());
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    ret = rtmp_send_hs_packet(rt, hs_my_epoch, 0, hs_s1,
                              RTMP_HANDSHAKE_PACKET_SIZE);
    if (ret) {
        av_log(s, AV_LOG_ERROR, "RTMP Handshake S1 Error\n");
        return ret;
    }
    /* Send S2 */
    ret = rtmp_send_hs_packet(rt, hs_epoch, 0, hs_c1,
                              RTMP_HANDSHAKE_PACKET_SIZE);
    if (ret) {
        av_log(s, AV_LOG_ERROR, "RTMP Handshake S2 Error\n");
        return ret;
    }
    /* Receive C2 */
    ret = rtmp_receive_hs_packet(rt, &temp, &zeroes, buffer,
                                 RTMP_HANDSHAKE_PACKET_SIZE);
    if (ret) {
        av_log(s, AV_LOG_ERROR, "RTMP Handshake C2 Error\n");
        return ret;
    }
    if (temp != hs_my_epoch)
        av_log(s, AV_LOG_WARNING,
               "Erroneous C2 Message epoch does not match up with C1 epoch\n");
    if (memcmp(buffer + 8, hs_s1 + 8,
               RTMP_HANDSHAKE_PACKET_SIZE - 8))
        av_log(s, AV_LOG_WARNING,
               "Erroneous C2 Message random does not match up\n");

    return 0;
}

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static int handle_chunk_size(URLContext *s, RTMPPacket *pkt)
{
    RTMPContext *rt = s->priv_data;
    int ret;

1528
    if (pkt->size < 4) {
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        av_log(s, AV_LOG_ERROR,
1530
               "Too short chunk size change packet (%d)\n",
1531
               pkt->size);
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        return AVERROR_INVALIDDATA;
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    }

    if (!rt->is_input) {
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        /* Send the same chunk size change packet back to the server,
         * setting the outgoing chunk size to the same as the incoming one. */
        if ((ret = ff_rtmp_packet_write(rt->stream, pkt, rt->out_chunk_size,
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                                        &rt->prev_pkt[1], &rt->nb_prev_pkt[1])) < 0)
1540
            return ret;
1541
        rt->out_chunk_size = AV_RB32(pkt->data);
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    }

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    rt->in_chunk_size = AV_RB32(pkt->data);
    if (rt->in_chunk_size <= 0) {
        av_log(s, AV_LOG_ERROR, "Incorrect chunk size %d\n",
               rt->in_chunk_size);
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        return AVERROR_INVALIDDATA;
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    }
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    av_log(s, AV_LOG_DEBUG, "New incoming chunk size = %d\n",
           rt->in_chunk_size);
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    return 0;
}

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static int handle_ping(URLContext *s, RTMPPacket *pkt)
{
    RTMPContext *rt = s->priv_data;
    int t, ret;

1561
    if (pkt->size < 2) {
1562
        av_log(s, AV_LOG_ERROR, "Too short ping packet (%d)\n",
1563
               pkt->size);
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        return AVERROR_INVALIDDATA;
    }

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    t = AV_RB16(pkt->data);
    if (t == 6) {
        if ((ret = gen_pong(s, rt, pkt)) < 0)
            return ret;
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    } else if (t == 26) {
        if (rt->swfsize) {
            if ((ret = gen_swf_verification(s, rt)) < 0)
                return ret;
        } else {
            av_log(s, AV_LOG_WARNING, "Ignoring SWFVerification request.\n");
        }
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    }

    return 0;
}

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static int handle_client_bw(URLContext *s, RTMPPacket *pkt)
1584
{
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    RTMPContext *rt = s->priv_data;

1587
    if (pkt->size < 4) {
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        av_log(s, AV_LOG_ERROR,
               "Client bandwidth report packet is less than 4 bytes long (%d)\n",
1590
               pkt->size);
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        return AVERROR_INVALIDDATA;
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    }
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    rt->client_report_size = AV_RB32(pkt->data);
    if (rt->client_report_size <= 0) {
        av_log(s, AV_LOG_ERROR, "Incorrect client bandwidth %d\n",
                rt->client_report_size);
        return AVERROR_INVALIDDATA;

    }
    av_log(s, AV_LOG_DEBUG, "Client bandwidth = %d\n", rt->client_report_size);
    rt->client_report_size >>= 1;
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    return 0;
}

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static int handle_server_bw(URLContext *s, RTMPPacket *pkt)
{
    RTMPContext *rt = s->priv_data;

1611
    if (pkt->size < 4) {
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        av_log(s, AV_LOG_ERROR,
               "Too short server bandwidth report packet (%d)\n",
1614
               pkt->size);
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        return AVERROR_INVALIDDATA;
    }

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    rt->server_bw = AV_RB32(pkt->data);
    if (rt->server_bw <= 0) {
        av_log(s, AV_LOG_ERROR, "Incorrect server bandwidth %d\n",
               rt->server_bw);
1622
        return AVERROR_INVALIDDATA;
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    }
    av_log(s, AV_LOG_DEBUG, "Server bandwidth = %d\n", rt->server_bw);

    return 0;
}

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static int do_adobe_auth(RTMPContext *rt, const char *user, const char *salt,
                         const char *opaque, const char *challenge)
{
    uint8_t hash[16];
    char hashstr[AV_BASE64_SIZE(sizeof(hash))], challenge2[10];
    struct AVMD5 *md5 = av_md5_alloc();
    if (!md5)
        return AVERROR(ENOMEM);

    snprintf(challenge2, sizeof(challenge2), "%08x", av_get_random_seed());

    av_md5_init(md5);
    av_md5_update(md5, user, strlen(user));
    av_md5_update(md5, salt, strlen(salt));
    av_md5_update(md5, rt->password, strlen(rt->password));
    av_md5_final(md5, hash);
    av_base64_encode(hashstr, sizeof(hashstr), hash,
                     sizeof(hash));
    av_md5_init(md5);
    av_md5_update(md5, hashstr, strlen(hashstr));
    if (opaque)
        av_md5_update(md5, opaque, strlen(opaque));
    else if (challenge)
        av_md5_update(md5, challenge, strlen(challenge));
    av_md5_update(md5, challenge2, strlen(challenge2));
    av_md5_final(md5, hash);
    av_base64_encode(hashstr, sizeof(hashstr), hash,
                     sizeof(hash));
    snprintf(rt->auth_params, sizeof(rt->auth_params),
             "?authmod=%s&user=%s&challenge=%s&response=%s",
             "adobe", user, challenge2, hashstr);
    if (opaque)
        av_strlcatf(rt->auth_params, sizeof(rt->auth_params),
                    "&opaque=%s", opaque);

    av_free(md5);
    return 0;
}

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static int do_llnw_auth(RTMPContext *rt, const char *user, const char *nonce)
{
    uint8_t hash[16];
    char hashstr1[33], hashstr2[33];
    const char *realm = "live";
    const char *method = "publish";
    const char *qop = "auth";
    const char *nc = "00000001";
    char cnonce[10];
    struct AVMD5 *md5 = av_md5_alloc();
    if (!md5)
        return AVERROR(ENOMEM);

    snprintf(cnonce, sizeof(cnonce), "%08x", av_get_random_seed());

    av_md5_init(md5);
    av_md5_update(md5, user, strlen(user));
    av_md5_update(md5, ":", 1);
    av_md5_update(md5, realm, strlen(realm));
    av_md5_update(md5, ":", 1);
    av_md5_update(md5, rt->password, strlen(rt->password));
    av_md5_final(md5, hash);
    ff_data_to_hex(hashstr1, hash, 16, 1);
    hashstr1[32] = '\0';

    av_md5_init(md5);
    av_md5_update(md5, method, strlen(method));
    av_md5_update(md5, ":/", 2);
    av_md5_update(md5, rt->app, strlen(rt->app));
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    if (!strchr(rt->app, '/'))
        av_md5_update(md5, "/_definst_", strlen("/_definst_"));
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    av_md5_final(md5, hash);
    ff_data_to_hex(hashstr2, hash, 16, 1);
    hashstr2[32] = '\0';

    av_md5_init(md5);
    av_md5_update(md5, hashstr1, strlen(hashstr1));
    av_md5_update(md5, ":", 1);
    if (nonce)
        av_md5_update(md5, nonce, strlen(nonce));
    av_md5_update(md5, ":", 1);
    av_md5_update(md5, nc, strlen(nc));
    av_md5_update(md5, ":", 1);
    av_md5_update(md5, cnonce, strlen(cnonce));
    av_md5_update(md5, ":", 1);
    av_md5_update(md5, qop, strlen(qop));
    av_md5_update(md5, ":", 1);
    av_md5_update(md5, hashstr2, strlen(hashstr2));
    av_md5_final(md5, hash);
    ff_data_to_hex(hashstr1, hash, 16, 1);

    snprintf(rt->auth_params, sizeof(rt->auth_params),
             "?authmod=%s&user=%s&nonce=%s&cnonce=%s&nc=%s&response=%s",
             "llnw", user, nonce, cnonce, nc, hashstr1);

    av_free(md5);
    return 0;
}

1727 1728 1729
static int handle_connect_error(URLContext *s, const char *desc)
{
    RTMPContext *rt = s->priv_data;
1730
    char buf[300], *ptr, authmod[15];
1731 1732
    int i = 0, ret = 0;
    const char *user = "", *salt = "", *opaque = NULL,
1733
               *challenge = NULL, *cptr = NULL, *nonce = NULL;
1734

1735 1736
    if (!(cptr = strstr(desc, "authmod=adobe")) &&
        !(cptr = strstr(desc, "authmod=llnw"))) {
1737 1738 1739 1740
        av_log(s, AV_LOG_ERROR,
               "Unknown connect error (unsupported authentication method?)\n");
        return AVERROR_UNKNOWN;
    }
1741 1742 1743 1744
    cptr += strlen("authmod=");
    while (*cptr && *cptr != ' ' && i < sizeof(authmod) - 1)
        authmod[i++] = *cptr++;
    authmod[i] = '\0';
1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767

    if (!rt->username[0] || !rt->password[0]) {
        av_log(s, AV_LOG_ERROR, "No credentials set\n");
        return AVERROR_UNKNOWN;
    }

    if (strstr(desc, "?reason=authfailed")) {
        av_log(s, AV_LOG_ERROR, "Incorrect username/password\n");
        return AVERROR_UNKNOWN;
    } else if (strstr(desc, "?reason=nosuchuser")) {
        av_log(s, AV_LOG_ERROR, "Incorrect username\n");
        return AVERROR_UNKNOWN;
    }

    if (rt->auth_tried) {
        av_log(s, AV_LOG_ERROR, "Authentication failed\n");
        return AVERROR_UNKNOWN;
    }

    rt->auth_params[0] = '\0';

    if (strstr(desc, "code=403 need auth")) {
        snprintf(rt->auth_params, sizeof(rt->auth_params),
1768
                 "?authmod=%s&user=%s", authmod, rt->username);
1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784
        return 0;
    }

    if (!(cptr = strstr(desc, "?reason=needauth"))) {
        av_log(s, AV_LOG_ERROR, "No auth parameters found\n");
        return AVERROR_UNKNOWN;
    }

    av_strlcpy(buf, cptr + 1, sizeof(buf));
    ptr = buf;

    while (ptr) {
        char *next  = strchr(ptr, '&');
        char *value = strchr(ptr, '=');
        if (next)
            *next++ = '\0';
1785
        if (value) {
1786
            *value++ = '\0';
1787 1788 1789 1790 1791 1792 1793 1794 1795 1796
            if (!strcmp(ptr, "user")) {
                user = value;
            } else if (!strcmp(ptr, "salt")) {
                salt = value;
            } else if (!strcmp(ptr, "opaque")) {
                opaque = value;
            } else if (!strcmp(ptr, "challenge")) {
                challenge = value;
            } else if (!strcmp(ptr, "nonce")) {
                nonce = value;
1797 1798
            } else {
                av_log(s, AV_LOG_INFO, "Ignoring unsupported var %s\n", ptr);
1799 1800 1801
            }
        } else {
            av_log(s, AV_LOG_WARNING, "Variable %s has NULL value\n", ptr);
1802 1803 1804 1805
        }
        ptr = next;
    }

1806
    if (!strcmp(authmod, "adobe")) {
1807
        if ((ret = do_adobe_auth(rt, user, salt, opaque, challenge)) < 0)
1808 1809 1810 1811 1812
            return ret;
    } else {
        if ((ret = do_llnw_auth(rt, user, nonce)) < 0)
            return ret;
    }
1813 1814 1815 1816 1817

    rt->auth_tried = 1;
    return 0;
}

1818
static int handle_invoke_error(URLContext *s, RTMPPacket *pkt)
1819
{
1820
    RTMPContext *rt = s->priv_data;
1821
    const uint8_t *data_end = pkt->data + pkt->size;
1822 1823
    char *tracked_method = NULL;
    int level = AV_LOG_ERROR;
1824
    uint8_t tmpstr[256];
1825 1826 1827 1828
    int ret;

    if ((ret = find_tracked_method(s, pkt, 9, &tracked_method)) < 0)
        return ret;
1829 1830 1831

    if (!ff_amf_get_field_value(pkt->data + 9, data_end,
                                "description", tmpstr, sizeof(tmpstr))) {
1832 1833 1834 1835 1836
        if (tracked_method && (!strcmp(tracked_method, "_checkbw")      ||
                               !strcmp(tracked_method, "releaseStream") ||
                               !strcmp(tracked_method, "FCSubscribe")   ||
                               !strcmp(tracked_method, "FCPublish"))) {
            /* Gracefully ignore Adobe-specific historical artifact errors. */
1837 1838
            level = AV_LOG_WARNING;
            ret = 0;
1839 1840
        } else if (tracked_method && !strcmp(tracked_method, "getStreamLength")) {
            level = rt->live ? AV_LOG_DEBUG : AV_LOG_WARNING;
1841
            ret = 0;
1842 1843 1844 1845 1846 1847
        } else if (tracked_method && !strcmp(tracked_method, "connect")) {
            ret = handle_connect_error(s, tmpstr);
            if (!ret) {
                rt->do_reconnect = 1;
                level = AV_LOG_VERBOSE;
            }
1848
        } else
1849
            ret = AVERROR_UNKNOWN;
1850
        av_log(s, level, "Server error: %s\n", tmpstr);
1851 1852
    }

1853 1854
    av_free(tracked_method);
    return ret;
1855 1856
}

1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875
static int write_begin(URLContext *s)
{
    RTMPContext *rt = s->priv_data;
    PutByteContext pbc;
    RTMPPacket spkt = { 0 };
    int ret;

    // Send Stream Begin 1
    if ((ret = ff_rtmp_packet_create(&spkt, RTMP_NETWORK_CHANNEL,
                                     RTMP_PT_PING, 0, 6)) < 0) {
        av_log(s, AV_LOG_ERROR, "Unable to create response packet\n");
        return ret;
    }

    bytestream2_init_writer(&pbc, spkt.data, spkt.size);
    bytestream2_put_be16(&pbc, 0);          // 0 -> Stream Begin
    bytestream2_put_be32(&pbc, rt->nb_streamid);

    ret = ff_rtmp_packet_write(rt->stream, &spkt, rt->out_chunk_size,
1876
                               &rt->prev_pkt[1], &rt->nb_prev_pkt[1]);
1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919

    ff_rtmp_packet_destroy(&spkt);

    return ret;
}

static int write_status(URLContext *s, RTMPPacket *pkt,
                        const char *status, const char *filename)
{
    RTMPContext *rt = s->priv_data;
    RTMPPacket spkt = { 0 };
    char statusmsg[128];
    uint8_t *pp;
    int ret;

    if ((ret = ff_rtmp_packet_create(&spkt, RTMP_SYSTEM_CHANNEL,
                                     RTMP_PT_INVOKE, 0,
                                     RTMP_PKTDATA_DEFAULT_SIZE)) < 0) {
        av_log(s, AV_LOG_ERROR, "Unable to create response packet\n");
        return ret;
    }

    pp = spkt.data;
    spkt.extra = pkt->extra;
    ff_amf_write_string(&pp, "onStatus");
    ff_amf_write_number(&pp, 0);
    ff_amf_write_null(&pp);

    ff_amf_write_object_start(&pp);
    ff_amf_write_field_name(&pp, "level");
    ff_amf_write_string(&pp, "status");
    ff_amf_write_field_name(&pp, "code");
    ff_amf_write_string(&pp, status);
    ff_amf_write_field_name(&pp, "description");
    snprintf(statusmsg, sizeof(statusmsg),
             "%s is now published", filename);
    ff_amf_write_string(&pp, statusmsg);
    ff_amf_write_field_name(&pp, "details");
    ff_amf_write_string(&pp, filename);
    ff_amf_write_object_end(&pp);

    spkt.size = pp - spkt.data;
    ret = ff_rtmp_packet_write(rt->stream, &spkt, rt->out_chunk_size,
1920
                               &rt->prev_pkt[1], &rt->nb_prev_pkt[1]);
1921 1922 1923 1924 1925
    ff_rtmp_packet_destroy(&spkt);

    return ret;
}

1926 1927 1928 1929
static int send_invoke_response(URLContext *s, RTMPPacket *pkt)
{
    RTMPContext *rt = s->priv_data;
    double seqnum;
1930
    char filename[128];
1931 1932 1933 1934 1935 1936 1937 1938 1939
    char command[64];
    int stringlen;
    char *pchar;
    const uint8_t *p = pkt->data;
    uint8_t *pp      = NULL;
    RTMPPacket spkt  = { 0 };
    GetByteContext gbc;
    int ret;

1940
    bytestream2_init(&gbc, p, pkt->size);
1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956
    if (ff_amf_read_string(&gbc, command, sizeof(command),
                           &stringlen)) {
        av_log(s, AV_LOG_ERROR, "Error in PT_INVOKE\n");
        return AVERROR_INVALIDDATA;
    }

    ret = ff_amf_read_number(&gbc, &seqnum);
    if (ret)
        return ret;
    ret = ff_amf_read_null(&gbc);
    if (ret)
        return ret;
    if (!strcmp(command, "FCPublish") ||
        !strcmp(command, "publish")) {
        ret = ff_amf_read_string(&gbc, filename,
                                 sizeof(filename), &stringlen);
1957 1958 1959 1960 1961 1962 1963
        if (ret) {
            if (ret == AVERROR(EINVAL))
                av_log(s, AV_LOG_ERROR, "Unable to parse stream name - name too long?\n");
            else
                av_log(s, AV_LOG_ERROR, "Unable to parse stream name\n");
            return ret;
        }
1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990
        // check with url
        if (s->filename) {
            pchar = strrchr(s->filename, '/');
            if (!pchar) {
                av_log(s, AV_LOG_WARNING,
                       "Unable to find / in url %s, bad format\n",
                       s->filename);
                pchar = s->filename;
            }
            pchar++;
            if (strcmp(pchar, filename))
                av_log(s, AV_LOG_WARNING, "Unexpected stream %s, expecting"
                       " %s\n", filename, pchar);
        }
        rt->state = STATE_RECEIVING;
    }

    if (!strcmp(command, "FCPublish")) {
        if ((ret = ff_rtmp_packet_create(&spkt, RTMP_SYSTEM_CHANNEL,
                                         RTMP_PT_INVOKE, 0,
                                         RTMP_PKTDATA_DEFAULT_SIZE)) < 0) {
            av_log(s, AV_LOG_ERROR, "Unable to create response packet\n");
            return ret;
        }
        pp = spkt.data;
        ff_amf_write_string(&pp, "onFCPublish");
    } else if (!strcmp(command, "publish")) {
1991
        ret = write_begin(s);
1992 1993 1994 1995
        if (ret < 0)
            return ret;

        // Send onStatus(NetStream.Publish.Start)
1996 1997
        return write_status(s, pkt, "NetStream.Publish.Start",
                           filename);
1998 1999 2000 2001 2002 2003 2004
    } else if (!strcmp(command, "play")) {
        ret = write_begin(s);
        if (ret < 0)
            return ret;
        rt->state = STATE_SENDING;
        return write_status(s, pkt, "NetStream.Play.Start",
                            filename);
2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025
    } else {
        if ((ret = ff_rtmp_packet_create(&spkt, RTMP_SYSTEM_CHANNEL,
                                         RTMP_PT_INVOKE, 0,
                                         RTMP_PKTDATA_DEFAULT_SIZE)) < 0) {
            av_log(s, AV_LOG_ERROR, "Unable to create response packet\n");
            return ret;
        }
        pp = spkt.data;
        ff_amf_write_string(&pp, "_result");
        ff_amf_write_number(&pp, seqnum);
        ff_amf_write_null(&pp);
        if (!strcmp(command, "createStream")) {
            rt->nb_streamid++;
            if (rt->nb_streamid == 0 || rt->nb_streamid == 2)
                rt->nb_streamid++; /* Values 0 and 2 are reserved */
            ff_amf_write_number(&pp, rt->nb_streamid);
            /* By now we don't control which streams are removed in
             * deleteStream. There is no stream creation control
             * if a client creates more than 2^32 - 2 streams. */
        }
    }
2026
    spkt.size = pp - spkt.data;
2027
    ret = ff_rtmp_packet_write(rt->stream, &spkt, rt->out_chunk_size,
2028
                               &rt->prev_pkt[1], &rt->nb_prev_pkt[1]);
2029 2030 2031 2032
    ff_rtmp_packet_destroy(&spkt);
    return ret;
}

2033 2034 2035 2036 2037 2038 2039
/**
 * Read the AMF_NUMBER response ("_result") to a function call
 * (e.g. createStream()). This response should be made up of the AMF_STRING
 * "result", a NULL object and then the response encoded as AMF_NUMBER. On a
 * successful response, we will return set the value to number (otherwise number
 * will not be changed).
 *
2040
 * @return 0 if reading the value succeeds, negative value otherwise
2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062
 */
static int read_number_result(RTMPPacket *pkt, double *number)
{
    // We only need to fit "_result" in this.
    uint8_t strbuffer[8];
    int stringlen;
    double numbuffer;
    GetByteContext gbc;

    bytestream2_init(&gbc, pkt->data, pkt->size);

    // Value 1/4: "_result" as AMF_STRING
    if (ff_amf_read_string(&gbc, strbuffer, sizeof(strbuffer), &stringlen))
        return AVERROR_INVALIDDATA;
    if (strcmp(strbuffer, "_result"))
        return AVERROR_INVALIDDATA;
    // Value 2/4: The callee reference number
    if (ff_amf_read_number(&gbc, &numbuffer))
        return AVERROR_INVALIDDATA;
    // Value 3/4: Null
    if (ff_amf_read_null(&gbc))
        return AVERROR_INVALIDDATA;
2063
    // Value 4/4: The response as AMF_NUMBER
2064 2065 2066 2067 2068 2069 2070 2071
    if (ff_amf_read_number(&gbc, &numbuffer))
        return AVERROR_INVALIDDATA;
    else
        *number = numbuffer;

    return 0;
}

2072 2073 2074
static int handle_invoke_result(URLContext *s, RTMPPacket *pkt)
{
    RTMPContext *rt = s->priv_data;
2075 2076
    char *tracked_method = NULL;
    int ret = 0;
2077

2078
    if ((ret = find_tracked_method(s, pkt, 10, &tracked_method)) < 0)
2079
        return ret;
2080

2081 2082 2083 2084
    if (!tracked_method) {
        /* Ignore this reply when the current method is not tracked. */
        return ret;
    }
2085

2086
    if (!strcmp(tracked_method, "connect")) {
2087 2088 2089
        if (!rt->is_input) {
            if ((ret = gen_release_stream(s, rt)) < 0)
                goto fail;
2090

2091 2092 2093 2094 2095
            if ((ret = gen_fcpublish_stream(s, rt)) < 0)
                goto fail;
        } else {
            if ((ret = gen_server_bw(s, rt)) < 0)
                goto fail;
2096 2097
        }

2098 2099
        if ((ret = gen_create_stream(s, rt)) < 0)
            goto fail;
2100

2101 2102 2103 2104 2105 2106 2107 2108 2109
        if (rt->is_input) {
            /* Send the FCSubscribe command when the name of live
             * stream is defined by the user or if it's a live stream. */
            if (rt->subscribe) {
                if ((ret = gen_fcsubscribe_stream(s, rt, rt->subscribe)) < 0)
                    goto fail;
            } else if (rt->live == -1) {
                if ((ret = gen_fcsubscribe_stream(s, rt, rt->playpath)) < 0)
                    goto fail;
2110
            }
2111
        }
2112
    } else if (!strcmp(tracked_method, "createStream")) {
2113 2114
        double stream_id;
        if (read_number_result(pkt, &stream_id)) {
2115 2116
            av_log(s, AV_LOG_WARNING, "Unexpected reply on connect()\n");
        } else {
2117
            rt->stream_id = stream_id;
2118
        }
2119 2120 2121 2122 2123

        if (!rt->is_input) {
            if ((ret = gen_publish(s, rt)) < 0)
                goto fail;
        } else {
2124 2125 2126 2127
            if (rt->live != -1) {
                if ((ret = gen_get_stream_length(s, rt)) < 0)
                    goto fail;
            }
2128 2129 2130 2131
            if ((ret = gen_play(s, rt)) < 0)
                goto fail;
            if ((ret = gen_buffer_time(s, rt)) < 0)
                goto fail;
2132
        }
2133 2134 2135 2136
    } else if (!strcmp(tracked_method, "getStreamLength")) {
        if (read_number_result(pkt, &rt->duration)) {
            av_log(s, AV_LOG_WARNING, "Unexpected reply on getStreamLength()\n");
        }
2137 2138 2139 2140 2141 2142 2143
    }

fail:
    av_free(tracked_method);
    return ret;
}

2144
static int handle_invoke_status(URLContext *s, RTMPPacket *pkt)
2145
{
2146
    RTMPContext *rt = s->priv_data;
2147
    const uint8_t *data_end = pkt->data + pkt->size;
2148
    const uint8_t *ptr = pkt->data + RTMP_HEADER;
2149
    uint8_t tmpstr[256];
2150
    int i, t;
2151 2152 2153 2154 2155 2156 2157 2158 2159 2160

    for (i = 0; i < 2; i++) {
        t = ff_amf_tag_size(ptr, data_end);
        if (t < 0)
            return 1;
        ptr += t;
    }

    t = ff_amf_get_field_value(ptr, data_end, "level", tmpstr, sizeof(tmpstr));
    if (!t && !strcmp(tmpstr, "error")) {
2161 2162 2163 2164 2165 2166
        t = ff_amf_get_field_value(ptr, data_end,
                                   "description", tmpstr, sizeof(tmpstr));
        if (t || !tmpstr[0])
            t = ff_amf_get_field_value(ptr, data_end, "code",
                                       tmpstr, sizeof(tmpstr));
        if (!t)
2167 2168 2169 2170 2171 2172 2173 2174 2175
            av_log(s, AV_LOG_ERROR, "Server error: %s\n", tmpstr);
        return -1;
    }

    t = ff_amf_get_field_value(ptr, data_end, "code", tmpstr, sizeof(tmpstr));
    if (!t && !strcmp(tmpstr, "NetStream.Play.Start")) rt->state = STATE_PLAYING;
    if (!t && !strcmp(tmpstr, "NetStream.Play.Stop")) rt->state = STATE_STOPPED;
    if (!t && !strcmp(tmpstr, "NetStream.Play.UnpublishNotify")) rt->state = STATE_STOPPED;
    if (!t && !strcmp(tmpstr, "NetStream.Publish.Start")) rt->state = STATE_PUBLISHING;
2176
    if (!t && !strcmp(tmpstr, "NetStream.Seek.Notify")) rt->state = STATE_PLAYING;
2177 2178 2179 2180 2181 2182 2183

    return 0;
}

static int handle_invoke(URLContext *s, RTMPPacket *pkt)
{
    RTMPContext *rt = s->priv_data;
2184
    int ret = 0;
2185

2186
    //TODO: check for the messages sent for wrong state?
2187
    if (ff_amf_match_string(pkt->data, pkt->size, "_error")) {
2188 2189
        if ((ret = handle_invoke_error(s, pkt)) < 0)
            return ret;
2190
    } else if (ff_amf_match_string(pkt->data, pkt->size, "_result")) {
2191
        if ((ret = handle_invoke_result(s, pkt)) < 0)
2192
            return ret;
2193
    } else if (ff_amf_match_string(pkt->data, pkt->size, "onStatus")) {
2194 2195
        if ((ret = handle_invoke_status(s, pkt)) < 0)
            return ret;
2196
    } else if (ff_amf_match_string(pkt->data, pkt->size, "onBWDone")) {
2197 2198
        if ((ret = gen_check_bw(s, rt)) < 0)
            return ret;
2199 2200 2201
    } else if (ff_amf_match_string(pkt->data, pkt->size, "releaseStream") ||
               ff_amf_match_string(pkt->data, pkt->size, "FCPublish")     ||
               ff_amf_match_string(pkt->data, pkt->size, "publish")       ||
2202
               ff_amf_match_string(pkt->data, pkt->size, "play")          ||
2203 2204
               ff_amf_match_string(pkt->data, pkt->size, "_checkbw")      ||
               ff_amf_match_string(pkt->data, pkt->size, "createStream")) {
2205
        if ((ret = send_invoke_response(s, pkt)) < 0)
2206
            return ret;
2207 2208
    }

2209
    return ret;
2210 2211
}

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2212 2213 2214
static int update_offset(RTMPContext *rt, int size)
{
    int old_flv_size;
2215

2216 2217
    // generate packet header and put data into buffer for FLV demuxer
    if (rt->flv_off < rt->flv_size) {
2218
        // There is old unread data in the buffer, thus append at the end
2219
        old_flv_size  = rt->flv_size;
2220
        rt->flv_size += size;
2221
    } else {
2222
        // All data has been read, write the new data at the start of the buffer
2223
        old_flv_size = 0;
2224
        rt->flv_size = size;
2225
        rt->flv_off  = 0;
2226
    }
2227

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    return old_flv_size;
}

static int append_flv_data(RTMPContext *rt, RTMPPacket *pkt, int skip)
{
    int old_flv_size, ret;
    PutByteContext pbc;
    const uint8_t *data = pkt->data + skip;
    const int size      = pkt->size - skip;
    uint32_t ts         = pkt->timestamp;

2239 2240 2241 2242 2243 2244
    if (pkt->type == RTMP_PT_AUDIO) {
        rt->has_audio = 1;
    } else if (pkt->type == RTMP_PT_VIDEO) {
        rt->has_video = 1;
    }

2245
    old_flv_size = update_offset(rt, size + 15);
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2246

2247 2248
    if ((ret = av_reallocp(&rt->flv_data, rt->flv_size)) < 0) {
        rt->flv_size = rt->flv_off = 0;
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        return ret;
2250
    }
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    bytestream2_init_writer(&pbc, rt->flv_data, rt->flv_size);
    bytestream2_skip_p(&pbc, old_flv_size);
    bytestream2_put_byte(&pbc, pkt->type);
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    bytestream2_put_be24(&pbc, size);
2255 2256 2257
    bytestream2_put_be24(&pbc, ts);
    bytestream2_put_byte(&pbc, ts >> 24);
    bytestream2_put_be24(&pbc, 0);
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2258
    bytestream2_put_buffer(&pbc, data, size);
2259
    bytestream2_put_be32(&pbc, size + RTMP_HEADER);
2260

2261 2262 2263
    return 0;
}

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static int handle_notify(URLContext *s, RTMPPacket *pkt)
{
    RTMPContext *rt  = s->priv_data;
    uint8_t commandbuffer[64];
    char statusmsg[128];
    int stringlen, ret, skip = 0;
    GetByteContext gbc;

    bytestream2_init(&gbc, pkt->data, pkt->size);
    if (ff_amf_read_string(&gbc, commandbuffer, sizeof(commandbuffer),
                           &stringlen))
        return AVERROR_INVALIDDATA;

2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308
    if (!strcmp(commandbuffer, "onMetaData")) {
        // metadata properties should be stored in a mixed array
        if (bytestream2_get_byte(&gbc) == AMF_DATA_TYPE_MIXEDARRAY) {
            // We have found a metaData Array so flv can determine the streams
            // from this.
            rt->received_metadata = 1;
            // skip 32-bit max array index
            bytestream2_skip(&gbc, 4);
            while (bytestream2_get_bytes_left(&gbc) > 3) {
                if (ff_amf_get_string(&gbc, statusmsg, sizeof(statusmsg),
                                      &stringlen))
                    return AVERROR_INVALIDDATA;
                // We do not care about the content of the property (yet).
                stringlen = ff_amf_tag_size(gbc.buffer, gbc.buffer_end);
                if (stringlen < 0)
                    return AVERROR_INVALIDDATA;
                bytestream2_skip(&gbc, stringlen);

                // The presence of the following properties indicates that the
                // respective streams are present.
                if (!strcmp(statusmsg, "videocodecid")) {
                    rt->has_video = 1;
                }
                if (!strcmp(statusmsg, "audiocodecid")) {
                    rt->has_audio = 1;
                }
            }
            if (bytestream2_get_be24(&gbc) != AMF_END_OF_OBJECT)
                return AVERROR_INVALIDDATA;
        }
    }

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2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320
    // Skip the @setDataFrame string and validate it is a notification
    if (!strcmp(commandbuffer, "@setDataFrame")) {
        skip = gbc.buffer - pkt->data;
        ret = ff_amf_read_string(&gbc, statusmsg,
                                 sizeof(statusmsg), &stringlen);
        if (ret < 0)
            return AVERROR_INVALIDDATA;
    }

    return append_flv_data(rt, pkt, skip);
}

2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334 2335
/**
 * Parse received packet and possibly perform some action depending on
 * the packet contents.
 * @return 0 for no errors, negative values for serious errors which prevent
 *         further communications, positive values for uncritical errors
 */
static int rtmp_parse_result(URLContext *s, RTMPContext *rt, RTMPPacket *pkt)
{
    int ret;

#ifdef DEBUG
    ff_rtmp_packet_dump(s, pkt);
#endif

    switch (pkt->type) {
2336
    case RTMP_PT_BYTES_READ:
2337
        av_log(s, AV_LOG_TRACE, "received bytes read report\n");
2338
        break;
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    case RTMP_PT_CHUNK_SIZE:
        if ((ret = handle_chunk_size(s, pkt)) < 0)
            return ret;
        break;
    case RTMP_PT_PING:
        if ((ret = handle_ping(s, pkt)) < 0)
            return ret;
        break;
    case RTMP_PT_CLIENT_BW:
        if ((ret = handle_client_bw(s, pkt)) < 0)
            return ret;
        break;
    case RTMP_PT_SERVER_BW:
        if ((ret = handle_server_bw(s, pkt)) < 0)
            return ret;
        break;
    case RTMP_PT_INVOKE:
        if ((ret = handle_invoke(s, pkt)) < 0)
            return ret;
2358
        break;
2359 2360
    case RTMP_PT_VIDEO:
    case RTMP_PT_AUDIO:
2361
    case RTMP_PT_METADATA:
2362
    case RTMP_PT_NOTIFY:
2363
        /* Audio, Video and Metadata packets are parsed in get_packet() */
2364
        break;
2365 2366 2367
    default:
        av_log(s, AV_LOG_VERBOSE, "Unknown packet type received 0x%02X\n", pkt->type);
        break;
2368 2369 2370 2371
    }
    return 0;
}

2372 2373 2374 2375 2376 2377 2378 2379 2380 2381
static int handle_metadata(RTMPContext *rt, RTMPPacket *pkt)
{
    int ret, old_flv_size, type;
    const uint8_t *next;
    uint8_t *p;
    uint32_t size;
    uint32_t ts, cts, pts = 0;

    old_flv_size = update_offset(rt, pkt->size);

2382 2383
    if ((ret = av_reallocp(&rt->flv_data, rt->flv_size)) < 0) {
        rt->flv_size = rt->flv_off = 0;
2384
        return ret;
2385
    }
2386 2387 2388 2389 2390 2391 2392

    next = pkt->data;
    p    = rt->flv_data + old_flv_size;

    /* copy data while rewriting timestamps */
    ts = pkt->timestamp;

2393
    while (next - pkt->data < pkt->size - RTMP_HEADER) {
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        type = bytestream_get_byte(&next);
        size = bytestream_get_be24(&next);
        cts  = bytestream_get_be24(&next);
        cts |= bytestream_get_byte(&next) << 24;
        if (!pts)
            pts = cts;
        ts += cts - pts;
        pts = cts;
2402 2403
        if (size + 3 + 4 > pkt->data + pkt->size - next)
            break;
2404 2405 2406 2407 2408
        bytestream_put_byte(&p, type);
        bytestream_put_be24(&p, size);
        bytestream_put_be24(&p, ts);
        bytestream_put_byte(&p, ts >> 24);
        memcpy(p, next, size + 3 + 4);
2409
        p    += size + 3;
2410
        bytestream_put_be32(&p, size + RTMP_HEADER);
2411 2412
        next += size + 3 + 4;
    }
2413 2414 2415 2416 2417
    if (p != rt->flv_data + rt->flv_size) {
        av_log(NULL, AV_LOG_WARNING, "Incomplete flv packets in "
                                     "RTMP_PT_METADATA packet\n");
        rt->flv_size = p - rt->flv_data;
    }
2418 2419 2420 2421

    return 0;
}

2422
/**
2423
 * Interact with the server by receiving and sending RTMP packets until
2424 2425 2426
 * there is some significant data (media data or expected status notification).
 *
 * @param s          reading context
2427 2428 2429 2430
 * @param for_header non-zero value tells function to work until it
 * gets notification from the server that playing has been started,
 * otherwise function will work until some media data is received (or
 * an error happens)
2431 2432 2433 2434 2435 2436 2437
 * @return 0 for successful operation, negative value in case of error
 */
static int get_packet(URLContext *s, int for_header)
{
    RTMPContext *rt = s->priv_data;
    int ret;

2438 2439 2440
    if (rt->state == STATE_STOPPED)
        return AVERROR_EOF;

2441
    for (;;) {
2442
        RTMPPacket rpkt = { 0 };
2443
        if ((ret = ff_rtmp_packet_read(rt->stream, &rpkt,
2444 2445
                                       rt->in_chunk_size, &rt->prev_pkt[0],
                                       &rt->nb_prev_pkt[0])) <= 0) {
2446
            if (ret == 0) {
2447 2448 2449 2450 2451
                return AVERROR(EAGAIN);
            } else {
                return AVERROR(EIO);
            }
        }
2452 2453 2454 2455

        // Track timestamp for later use
        rt->last_timestamp = rpkt.timestamp;

2456
        rt->bytes_read += ret;
2457
        if (rt->bytes_read - rt->last_bytes_read > rt->client_report_size) {
2458
            av_log(s, AV_LOG_DEBUG, "Sending bytes read report\n");
2459 2460
            if ((ret = gen_bytes_read(s, rt, rpkt.timestamp + 1)) < 0)
                return ret;
2461 2462
            rt->last_bytes_read = rt->bytes_read;
        }
2463 2464

        ret = rtmp_parse_result(s, rt, &rpkt);
2465 2466 2467 2468 2469 2470 2471 2472 2473 2474 2475

        // At this point we must check if we are in the seek state and continue
        // with the next packet. handle_invoke will get us out of this state
        // when the right message is encountered
        if (rt->state == STATE_SEEKING) {
            ff_rtmp_packet_destroy(&rpkt);
            // We continue, let the natural flow of things happen:
            // AVERROR(EAGAIN) or handle_invoke gets us out of here
            continue;
        }

2476 2477
        if (ret < 0) {//serious error in current packet
            ff_rtmp_packet_destroy(&rpkt);
2478
            return ret;
2479
        }
2480 2481 2482 2483
        if (rt->do_reconnect && for_header) {
            ff_rtmp_packet_destroy(&rpkt);
            return 0;
        }
2484 2485 2486 2487
        if (rt->state == STATE_STOPPED) {
            ff_rtmp_packet_destroy(&rpkt);
            return AVERROR_EOF;
        }
2488 2489
        if (for_header && (rt->state == STATE_PLAYING    ||
                           rt->state == STATE_PUBLISHING ||
2490
                           rt->state == STATE_SENDING    ||
2491
                           rt->state == STATE_RECEIVING)) {
2492 2493 2494
            ff_rtmp_packet_destroy(&rpkt);
            return 0;
        }
2495
        if (!rpkt.size || !rt->is_input) {
2496 2497 2498
            ff_rtmp_packet_destroy(&rpkt);
            continue;
        }
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        if (rpkt.type == RTMP_PT_VIDEO || rpkt.type == RTMP_PT_AUDIO) {
            ret = append_flv_data(rt, &rpkt, 0);
2501
            ff_rtmp_packet_destroy(&rpkt);
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2502
            return ret;
2503 2504 2505
        } else if (rpkt.type == RTMP_PT_NOTIFY) {
            ret = handle_notify(s, &rpkt);
            ff_rtmp_packet_destroy(&rpkt);
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2506
            return ret;
2507
        } else if (rpkt.type == RTMP_PT_METADATA) {
2508
            ret = handle_metadata(rt, &rpkt);
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            ff_rtmp_packet_destroy(&rpkt);
            return 0;
        }
        ff_rtmp_packet_destroy(&rpkt);
    }
}

static int rtmp_close(URLContext *h)
{
    RTMPContext *rt = h->priv_data;
2519
    int ret = 0, i, j;
2520

2521
    if (!rt->is_input) {
2522
        rt->flv_data = NULL;
2523
        if (rt->out_pkt.size)
2524
            ff_rtmp_packet_destroy(&rt->out_pkt);
2525
        if (rt->state > STATE_FCPUBLISH)
2526
            ret = gen_fcunpublish_stream(h, rt);
2527
    }
2528
    if (rt->state > STATE_HANDSHAKED)
2529
        ret = gen_delete_stream(h, rt);
2530 2531
    for (i = 0; i < 2; i++) {
        for (j = 0; j < rt->nb_prev_pkt[i]; j++)
2532
            ff_rtmp_packet_destroy(&rt->prev_pkt[i][j]);
2533 2534
        av_freep(&rt->prev_pkt[i]);
    }
2535

2536
    free_tracked_methods(rt);
2537
    av_freep(&rt->flv_data);
2538
    ffurl_close(rt->stream);
2539
    return ret;
2540 2541
}

2542 2543 2544 2545 2546 2547 2548 2549 2550 2551 2552 2553
/**
 * Insert a fake onMetadata packet into the FLV stream to notify the FLV
 * demuxer about the duration of the stream.
 *
 * This should only be done if there was no real onMetadata packet sent by the
 * server at the start of the stream and if we were able to retrieve a valid
 * duration via a getStreamLength call.
 *
 * @return 0 for successful operation, negative value in case of error
 */
static int inject_fake_duration_metadata(RTMPContext *rt)
{
2554
    // We need to insert the metadata packet directly after the FLV
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    // header, i.e. we need to move all other already read data by the
    // size of our fake metadata packet.

    uint8_t* p;
    // Keep old flv_data pointer
    uint8_t* old_flv_data = rt->flv_data;
    // Allocate a new flv_data pointer with enough space for the additional package
    if (!(rt->flv_data = av_malloc(rt->flv_size + 55))) {
        rt->flv_data = old_flv_data;
        return AVERROR(ENOMEM);
    }

    // Copy FLV header
    memcpy(rt->flv_data, old_flv_data, 13);
    // Copy remaining packets
    memcpy(rt->flv_data + 13 + 55, old_flv_data + 13, rt->flv_size - 13);
    // Increase the size by the injected packet
    rt->flv_size += 55;
    // Delete the old FLV data
2574
    av_freep(&old_flv_data);
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    p = rt->flv_data + 13;
    bytestream_put_byte(&p, FLV_TAG_TYPE_META);
    bytestream_put_be24(&p, 40); // size of data part (sum of all parts below)
    bytestream_put_be24(&p, 0);  // timestamp
    bytestream_put_be32(&p, 0);  // reserved

    // first event name as a string
    bytestream_put_byte(&p, AMF_DATA_TYPE_STRING);
    // "onMetaData" as AMF string
    bytestream_put_be16(&p, 10);
    bytestream_put_buffer(&p, "onMetaData", 10);

    // mixed array (hash) with size and string/type/data tuples
    bytestream_put_byte(&p, AMF_DATA_TYPE_MIXEDARRAY);
    bytestream_put_be32(&p, 1); // metadata_count

    // "duration" as AMF string
    bytestream_put_be16(&p, 8);
    bytestream_put_buffer(&p, "duration", 8);
    bytestream_put_byte(&p, AMF_DATA_TYPE_NUMBER);
    bytestream_put_be64(&p, av_double2int(rt->duration));

    // Finalise object
    bytestream_put_be16(&p, 0); // Empty string
    bytestream_put_byte(&p, AMF_END_OF_OBJECT);
2601
    bytestream_put_be32(&p, 40 + RTMP_HEADER); // size of data part (sum of all parts above)
2602 2603 2604 2605

    return 0;
}

2606
/**
2607
 * Open RTMP connection and verify that the stream can be played.
2608 2609 2610 2611 2612 2613 2614
 *
 * URL syntax: rtmp://server[:port][/app][/playpath]
 *             where 'app' is first one or two directories in the path
 *             (e.g. /ondemand/, /flash/live/, etc.)
 *             and 'playpath' is a file name (the rest of the path,
 *             may be prefixed with "mp4:")
 */
2615
static int rtmp_open(URLContext *s, const char *uri, int flags, AVDictionary **opts)
2616
{
2617
    RTMPContext *rt = s->priv_data;
2618
    char proto[8], hostname[256], path[1024], auth[100], *fname;
2619
    char *old_app, *qmark, *n, fname_buffer[1024];
2620
    uint8_t buf[2048];
2621
    int port;
2622 2623
    int ret;

2624 2625 2626
    if (rt->listen_timeout > 0)
        rt->listen = 1;

2627
    rt->is_input = !(flags & AVIO_FLAG_WRITE);
2628

2629 2630
    av_url_split(proto, sizeof(proto), auth, sizeof(auth),
                 hostname, sizeof(hostname), &port,
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Martin Storsjö committed
2631
                 path, sizeof(path), s->filename);
2632

2633 2634
    n = strchr(path, ' ');
    if (n) {
2635 2636 2637 2638
        av_log(s, AV_LOG_WARNING,
               "Detected librtmp style URL parameters, these aren't supported "
               "by the libavformat internal RTMP handler currently enabled. "
               "See the documentation for the correct way to pass parameters.\n");
2639
        *n = '\0'; // Trim not supported part
2640 2641
    }

2642 2643 2644 2645 2646 2647 2648 2649 2650
    if (auth[0]) {
        char *ptr = strchr(auth, ':');
        if (ptr) {
            *ptr = '\0';
            av_strlcpy(rt->username, auth, sizeof(rt->username));
            av_strlcpy(rt->password, ptr + 1, sizeof(rt->password));
        }
    }

2651 2652 2653 2654 2655
    if (rt->listen && strcmp(proto, "rtmp")) {
        av_log(s, AV_LOG_ERROR, "rtmp_listen not available for %s\n",
               proto);
        return AVERROR(EINVAL);
    }
2656 2657
    if (!strcmp(proto, "rtmpt") || !strcmp(proto, "rtmpts")) {
        if (!strcmp(proto, "rtmpts"))
2658
            av_dict_set(opts, "ffrtmphttp_tls", "1", 1);
2659

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2660
        /* open the http tunneling connection */
2661
        ff_url_join(buf, sizeof(buf), "ffrtmphttp", NULL, hostname, port, NULL);
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2662 2663 2664 2665 2666
    } else if (!strcmp(proto, "rtmps")) {
        /* open the tls connection */
        if (port < 0)
            port = RTMPS_DEFAULT_PORT;
        ff_url_join(buf, sizeof(buf), "tls", NULL, hostname, port, NULL);
2667 2668
    } else if (!strcmp(proto, "rtmpe") || (!strcmp(proto, "rtmpte"))) {
        if (!strcmp(proto, "rtmpte"))
2669
            av_dict_set(opts, "ffrtmpcrypt_tunneling", "1", 1);
2670

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2671 2672 2673
        /* open the encrypted connection */
        ff_url_join(buf, sizeof(buf), "ffrtmpcrypt", NULL, hostname, port, NULL);
        rt->encrypted = 1;
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2674 2675 2676 2677
    } else {
        /* open the tcp connection */
        if (port < 0)
            port = RTMP_DEFAULT_PORT;
2678 2679 2680 2681 2682 2683
        if (rt->listen)
            ff_url_join(buf, sizeof(buf), "tcp", NULL, hostname, port,
                        "?listen&listen_timeout=%d",
                        rt->listen_timeout * 1000);
        else
            ff_url_join(buf, sizeof(buf), "tcp", NULL, hostname, port, NULL);
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Samuel Pitoiset committed
2684
    }
2685

2686
reconnect:
2687
    if ((ret = ffurl_open_whitelist(&rt->stream, buf, AVIO_FLAG_READ_WRITE,
2688
                                    &s->interrupt_callback, opts,
2689
                                    s->protocol_whitelist, s->protocol_blacklist, s)) < 0) {
2690
        av_log(s , AV_LOG_ERROR, "Cannot open connection %s\n", buf);
2691
        goto fail;
2692
    }
2693

2694 2695 2696 2697 2698
    if (rt->swfverify) {
        if ((ret = rtmp_calc_swfhash(s)) < 0)
            goto fail;
    }

2699
    rt->state = STATE_START;
2700 2701 2702
    if (!rt->listen && (ret = rtmp_handshake(s, rt)) < 0)
        goto fail;
    if (rt->listen && (ret = rtmp_server_handshake(s, rt)) < 0)
2703
        goto fail;
2704

2705 2706
    rt->out_chunk_size = 128;
    rt->in_chunk_size  = 128; // Probably overwritten later
2707
    rt->state = STATE_HANDSHAKED;
2708 2709 2710 2711 2712 2713

    // Keep the application name when it has been defined by the user.
    old_app = rt->app;

    rt->app = av_malloc(APP_MAX_LENGTH);
    if (!rt->app) {
2714 2715
        ret = AVERROR(ENOMEM);
        goto fail;
2716 2717
    }

2718
    //extract "app" part from path
2719 2720 2721
    qmark = strchr(path, '?');
    if (qmark && strstr(qmark, "slist=")) {
        char* amp;
2722 2723
        // After slist we have the playpath, the full path is used as app
        av_strlcpy(rt->app, path + 1, APP_MAX_LENGTH);
2724 2725 2726 2727
        fname = strstr(path, "slist=") + 6;
        // Strip any further query parameters from fname
        amp = strchr(fname, '&');
        if (amp) {
2728 2729
            av_strlcpy(fname_buffer, fname, FFMIN(amp - fname + 1,
                                                  sizeof(fname_buffer)));
2730 2731 2732
            fname = fname_buffer;
        }
    } else if (!strncmp(path, "/ondemand/", 10)) {
2733 2734 2735
        fname = path + 10;
        memcpy(rt->app, "ondemand", 9);
    } else {
2736 2737
        char *next = *path ? path + 1 : path;
        char *p = strchr(next, '/');
2738
        if (!p) {
2739 2740 2741 2742 2743 2744 2745 2746
            if (old_app) {
                // If name of application has been defined by the user, assume that
                // playpath is provided in the URL
                fname = next;
            } else {
                fname = NULL;
                av_strlcpy(rt->app, next, APP_MAX_LENGTH);
            }
2747
        } else {
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2748
            // make sure we do not mismatch a playpath for an application instance
2749 2750
            char *c = strchr(p + 1, ':');
            fname = strchr(p + 1, '/');
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2751
            if (!fname || (c && c < fname)) {
2752
                fname = p + 1;
2753
                av_strlcpy(rt->app, path + 1, FFMIN(p - path, APP_MAX_LENGTH));
2754
            } else {
2755
                fname++;
2756
                av_strlcpy(rt->app, path + 1, FFMIN(fname - path - 1, APP_MAX_LENGTH));
2757 2758
            }
        }
2759
    }
2760 2761 2762

    if (old_app) {
        // The name of application has been defined by the user, override it.
2763 2764 2765 2766
        if (strlen(old_app) >= APP_MAX_LENGTH) {
            ret = AVERROR(EINVAL);
            goto fail;
        }
2767 2768 2769 2770
        av_free(rt->app);
        rt->app = old_app;
    }

2771 2772 2773
    if (!rt->playpath) {
        rt->playpath = av_malloc(PLAYPATH_MAX_LENGTH);
        if (!rt->playpath) {
2774 2775
            ret = AVERROR(ENOMEM);
            goto fail;
2776 2777
        }

2778 2779 2780 2781 2782 2783 2784 2785 2786 2787 2788 2789
        if (fname) {
            int len = strlen(fname);
            if (!strchr(fname, ':') && len >= 4 &&
                (!strcmp(fname + len - 4, ".f4v") ||
                 !strcmp(fname + len - 4, ".mp4"))) {
                memcpy(rt->playpath, "mp4:", 5);
            } else {
                if (len >= 4 && !strcmp(fname + len - 4, ".flv"))
                    fname[len - 4] = '\0';
                rt->playpath[0] = 0;
            }
            av_strlcat(rt->playpath, fname, PLAYPATH_MAX_LENGTH);
2790
        } else {
2791
            rt->playpath[0] = '\0';
2792
        }
2793
    }
2794

2795 2796
    if (!rt->tcurl) {
        rt->tcurl = av_malloc(TCURL_MAX_LENGTH);
2797 2798 2799 2800
        if (!rt->tcurl) {
            ret = AVERROR(ENOMEM);
            goto fail;
        }
2801 2802 2803 2804
        ff_url_join(rt->tcurl, TCURL_MAX_LENGTH, proto, NULL, hostname,
                    port, "/%s", rt->app);
    }

2805 2806
    if (!rt->flashver) {
        rt->flashver = av_malloc(FLASHVER_MAX_LENGTH);
2807 2808 2809 2810
        if (!rt->flashver) {
            ret = AVERROR(ENOMEM);
            goto fail;
        }
2811 2812 2813 2814 2815 2816 2817 2818 2819 2820
        if (rt->is_input) {
            snprintf(rt->flashver, FLASHVER_MAX_LENGTH, "%s %d,%d,%d,%d",
                    RTMP_CLIENT_PLATFORM, RTMP_CLIENT_VER1, RTMP_CLIENT_VER2,
                    RTMP_CLIENT_VER3, RTMP_CLIENT_VER4);
        } else {
            snprintf(rt->flashver, FLASHVER_MAX_LENGTH,
                    "FMLE/3.0 (compatible; %s)", LIBAVFORMAT_IDENT);
        }
    }

2821 2822
    rt->client_report_size = 1048576;
    rt->bytes_read = 0;
2823 2824 2825
    rt->has_audio = 0;
    rt->has_video = 0;
    rt->received_metadata = 0;
2826
    rt->last_bytes_read = 0;
2827
    rt->server_bw = 2500000;
2828
    rt->duration = 0;
2829

2830
    av_log(s, AV_LOG_DEBUG, "Proto = %s, path = %s, app = %s, fname = %s\n",
2831
           proto, path, rt->app, rt->playpath);
2832 2833 2834 2835
    if (!rt->listen) {
        if ((ret = gen_connect(s, rt)) < 0)
            goto fail;
    } else {
2836
        if ((ret = read_connect(s, s->priv_data)) < 0)
2837 2838
            goto fail;
    }
2839

2840 2841
    do {
        ret = get_packet(s, 1);
2842
    } while (ret == AVERROR(EAGAIN));
2843 2844
    if (ret < 0)
        goto fail;
2845

2846
    if (rt->do_reconnect) {
2847
        int i;
2848 2849 2850 2851
        ffurl_close(rt->stream);
        rt->stream       = NULL;
        rt->do_reconnect = 0;
        rt->nb_invokes   = 0;
2852 2853 2854
        for (i = 0; i < 2; i++)
            memset(rt->prev_pkt[i], 0,
                   sizeof(**rt->prev_pkt) * rt->nb_prev_pkt[i]);
2855 2856 2857 2858
        free_tracked_methods(rt);
        goto reconnect;
    }

2859
    if (rt->is_input) {
2860 2861
        // generate FLV header for demuxer
        rt->flv_size = 13;
2862 2863
        if ((ret = av_reallocp(&rt->flv_data, rt->flv_size)) < 0)
            goto fail;
2864
        rt->flv_off  = 0;
2865 2866 2867 2868 2869 2870 2871 2872 2873
        memcpy(rt->flv_data, "FLV\1\0\0\0\0\011\0\0\0\0", rt->flv_size);

        // Read packets until we reach the first A/V packet or read metadata.
        // If there was a metadata package in front of the A/V packets, we can
        // build the FLV header from this. If we do not receive any metadata,
        // the FLV decoder will allocate the needed streams when their first
        // audio or video packet arrives.
        while (!rt->has_audio && !rt->has_video && !rt->received_metadata) {
            if ((ret = get_packet(s, 0)) < 0)
2874
               goto fail;
2875 2876 2877 2878 2879 2880 2881 2882 2883 2884 2885
        }

        // Either after we have read the metadata or (if there is none) the
        // first packet of an A/V stream, we have a better knowledge about the
        // streams, so set the FLV header accordingly.
        if (rt->has_audio) {
            rt->flv_data[4] |= FLV_HEADER_FLAG_HASAUDIO;
        }
        if (rt->has_video) {
            rt->flv_data[4] |= FLV_HEADER_FLAG_HASVIDEO;
        }
2886 2887 2888 2889 2890 2891 2892 2893

        // If we received the first packet of an A/V stream and no metadata but
        // the server returned a valid duration, create a fake metadata packet
        // to inform the FLV decoder about the duration.
        if (!rt->received_metadata && rt->duration > 0) {
            if ((ret = inject_fake_duration_metadata(rt)) < 0)
                goto fail;
        }
2894 2895 2896 2897
    } else {
        rt->flv_size = 0;
        rt->flv_data = NULL;
        rt->flv_off  = 0;
2898
        rt->skip_bytes = 13;
2899 2900
    }

2901
    s->max_packet_size = rt->stream->max_packet_size;
2902 2903 2904 2905
    s->is_streamed     = 1;
    return 0;

fail:
2906
    av_dict_free(opts);
2907
    rtmp_close(s);
2908
    return ret;
2909 2910 2911 2912 2913 2914 2915 2916 2917 2918 2919 2920 2921 2922 2923 2924 2925 2926 2927 2928 2929
}

static int rtmp_read(URLContext *s, uint8_t *buf, int size)
{
    RTMPContext *rt = s->priv_data;
    int orig_size = size;
    int ret;

    while (size > 0) {
        int data_left = rt->flv_size - rt->flv_off;

        if (data_left >= size) {
            memcpy(buf, rt->flv_data + rt->flv_off, size);
            rt->flv_off += size;
            return orig_size;
        }
        if (data_left > 0) {
            memcpy(buf, rt->flv_data + rt->flv_off, data_left);
            buf  += data_left;
            size -= data_left;
            rt->flv_off = rt->flv_size;
2930
            return data_left;
2931 2932 2933 2934 2935 2936 2937
        }
        if ((ret = get_packet(s, 0)) < 0)
           return ret;
    }
    return orig_size;
}

2938 2939 2940 2941 2942 2943
static int64_t rtmp_seek(URLContext *s, int stream_index, int64_t timestamp,
                         int flags)
{
    RTMPContext *rt = s->priv_data;
    int ret;
    av_log(s, AV_LOG_DEBUG,
2944
           "Seek on stream index %d at timestamp %"PRId64" with flags %08x\n",
2945 2946 2947
           stream_index, timestamp, flags);
    if ((ret = gen_seek(s, rt, timestamp)) < 0) {
        av_log(s, AV_LOG_ERROR,
2948 2949
               "Unable to send seek command on stream index %d at timestamp "
               "%"PRId64" with flags %08x\n",
2950 2951 2952 2953 2954 2955 2956 2957
               stream_index, timestamp, flags);
        return ret;
    }
    rt->flv_off = rt->flv_size;
    rt->state = STATE_SEEKING;
    return timestamp;
}

2958 2959 2960 2961 2962 2963 2964 2965 2966 2967 2968 2969 2970 2971
static int rtmp_pause(URLContext *s, int pause)
{
    RTMPContext *rt = s->priv_data;
    int ret;
    av_log(s, AV_LOG_DEBUG, "Pause at timestamp %d\n",
           rt->last_timestamp);
    if ((ret = gen_pause(s, rt, pause, rt->last_timestamp)) < 0) {
        av_log(s, AV_LOG_ERROR, "Unable to send pause command at timestamp %d\n",
               rt->last_timestamp);
        return ret;
    }
    return 0;
}

2972
static int rtmp_write(URLContext *s, const uint8_t *buf, int size)
2973
{
2974
    RTMPContext *rt = s->priv_data;
2975
    int size_temp = size;
2976
    int pktsize, pkttype, copy;
2977 2978
    uint32_t ts;
    const uint8_t *buf_temp = buf;
2979
    uint8_t c;
2980
    int ret;
2981 2982

    do {
2983 2984 2985 2986 2987 2988 2989 2990
        if (rt->skip_bytes) {
            int skip = FFMIN(rt->skip_bytes, size_temp);
            buf_temp       += skip;
            size_temp      -= skip;
            rt->skip_bytes -= skip;
            continue;
        }

2991
        if (rt->flv_header_bytes < RTMP_HEADER) {
2992
            const uint8_t *header = rt->flv_header;
2993
            int channel = RTMP_AUDIO_CHANNEL;
2994

2995
            copy = FFMIN(RTMP_HEADER - rt->flv_header_bytes, size_temp);
2996 2997 2998
            bytestream_get_buffer(&buf_temp, rt->flv_header + rt->flv_header_bytes, copy);
            rt->flv_header_bytes += copy;
            size_temp            -= copy;
2999
            if (rt->flv_header_bytes < RTMP_HEADER)
3000
                break;
3001

3002 3003 3004 3005 3006
            pkttype = bytestream_get_byte(&header);
            pktsize = bytestream_get_be24(&header);
            ts = bytestream_get_be24(&header);
            ts |= bytestream_get_byte(&header) << 24;
            bytestream_get_be24(&header);
3007 3008
            rt->flv_size = pktsize;

3009 3010 3011
            if (pkttype == RTMP_PT_VIDEO)
                channel = RTMP_VIDEO_CHANNEL;

3012 3013
            if (((pkttype == RTMP_PT_VIDEO || pkttype == RTMP_PT_AUDIO) && ts == 0) ||
                pkttype == RTMP_PT_NOTIFY) {
3014 3015 3016 3017
                if ((ret = ff_rtmp_check_alloc_array(&rt->prev_pkt[1],
                                                     &rt->nb_prev_pkt[1],
                                                     channel)) < 0)
                    return ret;
3018
                // Force sending a full 12 bytes header by clearing the
3019 3020
                // channel id, to make it not match a potential earlier
                // packet in the same channel.
3021
                rt->prev_pkt[1][channel].channel_id = 0;
3022 3023 3024
            }

            //this can be a big packet, it's better to send it right here
3025
            if ((ret = ff_rtmp_packet_create(&rt->out_pkt, channel,
3026 3027 3028
                                             pkttype, ts, pktsize)) < 0)
                return ret;

3029
            rt->out_pkt.extra = rt->stream_id;
3030 3031 3032
            rt->flv_data = rt->out_pkt.data;
        }

3033 3034 3035 3036
        copy = FFMIN(rt->flv_size - rt->flv_off, size_temp);
        bytestream_get_buffer(&buf_temp, rt->flv_data + rt->flv_off, copy);
        rt->flv_off += copy;
        size_temp   -= copy;
3037 3038

        if (rt->flv_off == rt->flv_size) {
3039 3040
            rt->skip_bytes = 4;

3041 3042 3043 3044 3045 3046 3047 3048 3049 3050 3051 3052 3053 3054 3055 3056 3057 3058 3059 3060 3061 3062 3063 3064 3065 3066 3067
            if (rt->out_pkt.type == RTMP_PT_NOTIFY) {
                // For onMetaData and |RtmpSampleAccess packets, we want
                // @setDataFrame prepended to the packet before it gets sent.
                // However, not all RTMP_PT_NOTIFY packets (e.g., onTextData
                // and onCuePoint).
                uint8_t commandbuffer[64];
                int stringlen = 0;
                GetByteContext gbc;

                bytestream2_init(&gbc, rt->flv_data, rt->flv_size);
                if (!ff_amf_read_string(&gbc, commandbuffer, sizeof(commandbuffer),
                                        &stringlen)) {
                    if (!strcmp(commandbuffer, "onMetaData") ||
                        !strcmp(commandbuffer, "|RtmpSampleAccess")) {
                        uint8_t *ptr;
                        if ((ret = av_reallocp(&rt->out_pkt.data, rt->out_pkt.size + 16)) < 0) {
                            rt->flv_size = rt->flv_off = rt->flv_header_bytes = 0;
                            return ret;
                        }
                        memmove(rt->out_pkt.data + 16, rt->out_pkt.data, rt->out_pkt.size);
                        rt->out_pkt.size += 16;
                        ptr = rt->out_pkt.data;
                        ff_amf_write_string(&ptr, "@setDataFrame");
                    }
                }
            }

3068
            if ((ret = rtmp_send_packet(rt, &rt->out_pkt, 0)) < 0)
3069
                return ret;
3070 3071
            rt->flv_size = 0;
            rt->flv_off = 0;
3072
            rt->flv_header_bytes = 0;
3073
            rt->flv_nb_packets++;
3074
        }
3075
    } while (buf_temp - buf < size);
3076

3077 3078 3079 3080
    if (rt->flv_nb_packets < rt->flush_interval)
        return size;
    rt->flv_nb_packets = 0;

3081 3082 3083 3084 3085 3086 3087 3088 3089 3090 3091 3092 3093 3094 3095 3096 3097 3098
    /* set stream into nonblocking mode */
    rt->stream->flags |= AVIO_FLAG_NONBLOCK;

    /* try to read one byte from the stream */
    ret = ffurl_read(rt->stream, &c, 1);

    /* switch the stream back into blocking mode */
    rt->stream->flags &= ~AVIO_FLAG_NONBLOCK;

    if (ret == AVERROR(EAGAIN)) {
        /* no incoming data to handle */
        return size;
    } else if (ret < 0) {
        return ret;
    } else if (ret == 1) {
        RTMPPacket rpkt = { 0 };

        if ((ret = ff_rtmp_packet_read_internal(rt->stream, &rpkt,
3099
                                                rt->in_chunk_size,
3100 3101
                                                &rt->prev_pkt[0],
                                                &rt->nb_prev_pkt[0], c)) <= 0)
3102 3103 3104 3105 3106 3107 3108 3109
             return ret;

        if ((ret = rtmp_parse_result(s, rt, &rpkt)) < 0)
            return ret;

        ff_rtmp_packet_destroy(&rpkt);
    }

3110
    return size;
3111 3112
}

3113 3114 3115 3116 3117 3118
#define OFFSET(x) offsetof(RTMPContext, x)
#define DEC AV_OPT_FLAG_DECODING_PARAM
#define ENC AV_OPT_FLAG_ENCODING_PARAM

static const AVOption rtmp_options[] = {
    {"rtmp_app", "Name of application to connect to on the RTMP server", OFFSET(app), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, DEC|ENC},
3119
    {"rtmp_buffer", "Set buffer time in milliseconds. The default is 3000.", OFFSET(client_buffer_time), AV_OPT_TYPE_INT, {.i64 = 3000}, 0, INT_MAX, DEC|ENC},
3120
    {"rtmp_conn", "Append arbitrary AMF data to the Connect message", OFFSET(conn), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, DEC|ENC},
3121
    {"rtmp_flashver", "Version of the Flash plugin used to run the SWF player.", OFFSET(flashver), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, DEC|ENC},
3122 3123
    {"rtmp_flush_interval", "Number of packets flushed in the same request (RTMPT only).", OFFSET(flush_interval), AV_OPT_TYPE_INT, {.i64 = 10}, 0, INT_MAX, ENC},
    {"rtmp_live", "Specify that the media is a live stream.", OFFSET(live), AV_OPT_TYPE_INT, {.i64 = -2}, INT_MIN, INT_MAX, DEC, "rtmp_live"},
3124 3125 3126
    {"any", "both", 0, AV_OPT_TYPE_CONST, {.i64 = -2}, 0, 0, DEC, "rtmp_live"},
    {"live", "live stream", 0, AV_OPT_TYPE_CONST, {.i64 = -1}, 0, 0, DEC, "rtmp_live"},
    {"recorded", "recorded stream", 0, AV_OPT_TYPE_CONST, {.i64 = 0}, 0, 0, DEC, "rtmp_live"},
3127
    {"rtmp_pageurl", "URL of the web page in which the media was embedded. By default no value will be sent.", OFFSET(pageurl), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, DEC},
3128
    {"rtmp_playpath", "Stream identifier to play or to publish", OFFSET(playpath), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, DEC|ENC},
3129
    {"rtmp_subscribe", "Name of live stream to subscribe to. Defaults to rtmp_playpath.", OFFSET(subscribe), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, DEC},
3130
    {"rtmp_swfhash", "SHA256 hash of the decompressed SWF file (32 bytes).", OFFSET(swfhash), AV_OPT_TYPE_BINARY, .flags = DEC},
3131
    {"rtmp_swfsize", "Size of the decompressed SWF file, required for SWFVerification.", OFFSET(swfsize), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, DEC},
3132
    {"rtmp_swfurl", "URL of the SWF player. By default no value will be sent", OFFSET(swfurl), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, DEC|ENC},
3133
    {"rtmp_swfverify", "URL to player swf file, compute hash/size automatically.", OFFSET(swfverify), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, DEC},
3134
    {"rtmp_tcurl", "URL of the target stream. Defaults to proto://host[:port]/app.", OFFSET(tcurl), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, DEC|ENC},
3135
    {"rtmp_listen", "Listen for incoming rtmp connections", OFFSET(listen), AV_OPT_TYPE_INT, {.i64 = 0}, INT_MIN, INT_MAX, DEC, "rtmp_listen" },
3136
    {"listen",      "Listen for incoming rtmp connections", OFFSET(listen), AV_OPT_TYPE_INT, {.i64 = 0}, INT_MIN, INT_MAX, DEC, "rtmp_listen" },
3137
    {"timeout", "Maximum timeout (in seconds) to wait for incoming connections. -1 is infinite. Implies -rtmp_listen 1",  OFFSET(listen_timeout), AV_OPT_TYPE_INT, {.i64 = -1}, INT_MIN, INT_MAX, DEC, "rtmp_listen" },
3138 3139 3140
    { NULL },
};

3141 3142 3143 3144 3145 3146 3147 3148
#define RTMP_PROTOCOL(flavor)                    \
static const AVClass flavor##_class = {          \
    .class_name = #flavor,                       \
    .item_name  = av_default_item_name,          \
    .option     = rtmp_options,                  \
    .version    = LIBAVUTIL_VERSION_INT,         \
};                                               \
                                                 \
3149
const URLProtocol ff_##flavor##_protocol = {     \
3150
    .name           = #flavor,                   \
3151
    .url_open2      = rtmp_open,                 \
3152
    .url_read       = rtmp_read,                 \
3153
    .url_read_seek  = rtmp_seek,                 \
3154
    .url_read_pause = rtmp_pause,                \
3155 3156 3157 3158 3159
    .url_write      = rtmp_write,                \
    .url_close      = rtmp_close,                \
    .priv_data_size = sizeof(RTMPContext),       \
    .flags          = URL_PROTOCOL_FLAG_NETWORK, \
    .priv_data_class= &flavor##_class,           \
3160
};
Samuel Pitoiset's avatar
Samuel Pitoiset committed
3161

Samuel Pitoiset's avatar
Samuel Pitoiset committed
3162

3163 3164 3165 3166 3167 3168
RTMP_PROTOCOL(rtmp)
RTMP_PROTOCOL(rtmpe)
RTMP_PROTOCOL(rtmps)
RTMP_PROTOCOL(rtmpt)
RTMP_PROTOCOL(rtmpte)
RTMP_PROTOCOL(rtmpts)