rtmpproto.c 87.3 KB
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/*
 * RTMP network protocol
 * Copyright (c) 2009 Kostya Shishkov
 *
 * 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/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 "libavutil/sha.h"
#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 DEBUG

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#define APP_MAX_LENGTH 1024
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#define PLAYPATH_MAX_LENGTH 256
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#define TCURL_MAX_LENGTH 512
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#define FLASHVER_MAX_LENGTH 64
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#define RTMP_PKTDATA_DEFAULT_SIZE 4096
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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_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_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
    RTMPPacket    prev_pkt[2][RTMP_CHANNELS]; ///< packet history used when reading and sending packets
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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
    int           main_channel_id;            ///< an additional channel ID which is used for some invocations
    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
    uint32_t      bytes_read;                 ///< number of bytes read from server
    uint32_t      last_bytes_read;            ///< number of bytes read last reported to server
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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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    uint8_t       flv_header[11];             ///< partial incoming flv packet header
    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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    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 add_tracked_method(RTMPContext *rt, const char *name, int id)
{
    void *ptr;

    if (rt->nb_tracked_methods + 1 > rt->tracked_methods_size) {
        rt->tracked_methods_size = (rt->nb_tracked_methods + 1) * 2;
        ptr = av_realloc(rt->tracked_methods,
                         rt->tracked_methods_size * sizeof(*rt->tracked_methods));
        if (!ptr)
            return AVERROR(ENOMEM);
        rt->tracked_methods = ptr;
    }

    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;

    bytestream2_init(&gbc, pkt->data + offset, pkt->data_size - offset);
    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 ++)
        av_free(rt->tracked_methods[i].name);
    av_free(rt->tracked_methods);
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    rt->tracked_methods      = NULL;
    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;

        bytestream2_init(&gbc, pkt->data, pkt->data_size);
        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]);
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) {
        ff_amf_write_field_name(&p, "swfUrl");
        ff_amf_write_string(&p, rt->swfurl);
    }

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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.
        while (param != NULL) {
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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.data_size = p - pkt.data;

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

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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;

    if ((ret = ff_rtmp_packet_read(rt->stream, &pkt, rt->in_chunk_size,
                                   rt->prev_pkt[1])) < 0)
        return ret;
    cp = pkt.data;
    bytestream2_init(&gbc, cp, pkt.data_size);
    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);

    // Send Window Acknowledgement Size (as defined in speficication)
    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);
    pkt.data_size = p - pkt.data;
    ret = ff_rtmp_packet_write(rt->stream, &pkt, rt->out_chunk_size,
                               rt->prev_pkt[1]);
    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
    pkt.data_size = p - pkt.data;
    ret = ff_rtmp_packet_write(rt->stream, &pkt, rt->out_chunk_size,
                               rt->prev_pkt[1]);
    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,
                               rt->prev_pkt[1]);
    ff_rtmp_packet_destroy(&pkt);
    if (ret < 0)
        return ret;

    // Chunk size
    if ((ret = ff_rtmp_packet_create(&pkt, RTMP_SYSTEM_CHANNEL,
                                     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,
                               rt->prev_pkt[1]);
    ff_rtmp_packet_destroy(&pkt);
    if (ret < 0)
        return ret;

    // Send result_ NetConnection.Connect.Success to connect
    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);

    pkt.data_size = p - pkt.data;
    ret = ff_rtmp_packet_write(rt->stream, &pkt, rt->out_chunk_size,
                               rt->prev_pkt[1]);
    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);
    pkt.data_size = p - pkt.data;
    ret = ff_rtmp_packet_write(rt->stream, &pkt, rt->out_chunk_size,
                               rt->prev_pkt[1]);
    ff_rtmp_packet_destroy(&pkt);

    return ret;
}

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/**
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 * Generate 'releaseStream' call and send it to the server. It should make
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 * the server release some channel for media streams.
 */
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static int gen_release_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, 29 + strlen(rt->playpath))) < 0)
        return ret;
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    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);

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

/**
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 * Generate 'FCPublish' call and send it to the server. It should make
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 * the server preapare for receiving media streams.
 */
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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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    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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}

/**
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 * Generate 'FCUnpublish' call and send it to the server. It should make
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 * the server destroy stream.
 */
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static int gen_fcunpublish_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, 27 + strlen(rt->playpath))) < 0)
        return ret;
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    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);

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

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/**
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 * 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)
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{
    RTMPPacket pkt;
    uint8_t *p;
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    int ret;
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    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);

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


/**
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 * 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)
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{
    RTMPPacket pkt;
    uint8_t *p;
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    int ret;
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    av_log(s, AV_LOG_DEBUG, "Deleting stream...\n");
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    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->main_channel_id);
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    return rtmp_send_packet(rt, &pkt, 0);
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}

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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);
    bytestream_put_be32(&p, rt->main_channel_id);
    bytestream_put_be32(&p, rt->client_buffer_time);

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

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

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    pkt.extra = rt->main_channel_id;

    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);
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706
    return rtmp_send_packet(rt, &pkt, 1);
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}

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/**
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 * Generate 'publish' call and send it to the server.
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 */
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static int gen_publish(URLContext *s, RTMPContext *rt)
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{
    RTMPPacket pkt;
    uint8_t *p;
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    int ret;
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    av_log(s, AV_LOG_DEBUG, "Sending publish command for '%s'\n", rt->playpath);
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    if ((ret = ff_rtmp_packet_create(&pkt, RTMP_SOURCE_CHANNEL, RTMP_PT_INVOKE,
                                     0, 30 + strlen(rt->playpath))) < 0)
        return ret;

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    pkt.extra = rt->main_channel_id;

    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");

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

736
/**
737
 * Generate ping reply and send it to the server.
738
 */
739
static int gen_pong(URLContext *s, RTMPContext *rt, RTMPPacket *ppkt)
740 741 742
{
    RTMPPacket pkt;
    uint8_t *p;
743 744
    int ret;

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

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    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));
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759
    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);
}

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/**
 * Generate server bandwidth message and send it to the server.
 */
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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;
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    bytestream_put_be32(&p, rt->server_bw);
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    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.
 */
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static int gen_check_bw(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, 21)) < 0)
        return ret;
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    p = pkt.data;
    ff_amf_write_string(&p, "_checkbw");
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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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    return rtmp_send_packet(rt, &pkt, 1);
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}

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/**
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 * Generate report on bytes read so far and send it to the server.
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 */
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static int gen_bytes_read(URLContext *s, RTMPContext *rt, uint32_t ts)
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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_BYTES_READ,
                                     ts, 4)) < 0)
        return ret;
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    p = pkt.data;
    bytestream_put_be32(&p, rt->bytes_read);
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    return rtmp_send_packet(rt, &pkt, 0);
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}

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static int gen_fcsubscribe_stream(URLContext *s, RTMPContext *rt,
                                  const char *subscribe)
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{
    RTMPPacket pkt;
    uint8_t *p;
    int ret;

    if ((ret = ff_rtmp_packet_create(&pkt, RTMP_SYSTEM_CHANNEL, RTMP_PT_INVOKE,
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                                     0, 27 + strlen(subscribe))) < 0)
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        return ret;

    p = pkt.data;
    ff_amf_write_string(&p, "FCSubscribe");
    ff_amf_write_number(&p, ++rt->nb_invokes);
    ff_amf_write_null(&p);
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    ff_amf_write_string(&p, subscribe);
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859
    return rtmp_send_packet(rt, &pkt, 1);
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}

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int ff_rtmp_calc_digest(const uint8_t *src, int len, int gap,
                        const uint8_t *key, int keylen, uint8_t *dst)
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{
    struct AVSHA *sha;
    uint8_t hmac_buf[64+32] = {0};
    int i;

869
    sha = av_sha_alloc();
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    if (!sha)
        return AVERROR(ENOMEM);
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    if (keylen < 64) {
        memcpy(hmac_buf, key, keylen);
    } else {
        av_sha_init(sha, 256);
        av_sha_update(sha,key, keylen);
        av_sha_final(sha, hmac_buf);
    }
    for (i = 0; i < 64; i++)
        hmac_buf[i] ^= HMAC_IPAD_VAL;

    av_sha_init(sha, 256);
    av_sha_update(sha, hmac_buf, 64);
    if (gap <= 0) {
        av_sha_update(sha, src, len);
    } else { //skip 32 bytes used for storing digest
        av_sha_update(sha, src, gap);
        av_sha_update(sha, src + gap + 32, len - gap - 32);
    }
    av_sha_final(sha, hmac_buf + 64);

    for (i = 0; i < 64; i++)
        hmac_buf[i] ^= HMAC_IPAD_VAL ^ HMAC_OPAD_VAL; //reuse XORed key for opad
    av_sha_init(sha, 256);
    av_sha_update(sha, hmac_buf, 64+32);
    av_sha_final(sha, dst);

    av_free(sha);
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    return 0;
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}

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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;
}

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/**
917
 * Put HMAC-SHA2 digest of packet data (except for the bytes where this digest
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 * will be stored) into that packet.
 *
 * @param buf handshake data (1536 bytes)
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 * @param encrypted use an encrypted connection (RTMPE)
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 * @return offset to the digest inside input data
 */
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static int rtmp_handshake_imprint_with_digest(uint8_t *buf, int encrypted)
925
{
926
    int ret, digest_pos;
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    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);
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    ret = ff_rtmp_calc_digest(buf, RTMP_HANDSHAKE_PACKET_SIZE, digest_pos,
                              rtmp_player_key, PLAYER_KEY_OPEN_PART_LEN,
                              buf + digest_pos);
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    if (ret < 0)
        return ret;

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    return digest_pos;
}

/**
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 * Verify that the received server response has the expected digest value.
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 *
 * @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];
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    int ret, digest_pos;
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954
    digest_pos = ff_rtmp_calc_digest_pos(buf, off, 728, off + 4);
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    ret = ff_rtmp_calc_digest(buf, RTMP_HANDSHAKE_PACKET_SIZE, digest_pos,
                              rtmp_server_key, SERVER_KEY_OPEN_PART_LEN,
                              digest);
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    if (ret < 0)
        return ret;

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    if (!memcmp(digest, buf + digest_pos, 32))
        return digest_pos;
    return 0;
}

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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;
}

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#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;
    int64_t in_size, out_size;
    URLContext *stream;
    char swfhash[32];
    int swfsize;
    int ret = 0;

    /* Get the SWF player file. */
    if ((ret = ffurl_open(&stream, rt->swfverify, AVIO_FLAG_READ,
                          &s->interrupt_callback, NULL)) < 0) {
        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)) {
        /* 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 CONFIG_ZLIB
        if ((ret = rtmp_uncompress_swfplayer(in_data + 8, in_size - 8,
                                             &out_data, &out_size)) < 0)
            goto fail;
#else
        av_log(s, AV_LOG_ERROR,
               "Zlib is required for decompressing the SWF player file.\n");
        ret = AVERROR(EINVAL);
        goto fail;
#endif
        swfsize = out_size;
        swfdata = out_data;
    } 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;
}

1114
/**
1115
 * 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
        RTMP_CLIENT_VER1,
        RTMP_CLIENT_VER2,
        RTMP_CLIENT_VER3,
        RTMP_CLIENT_VER4,
    };
    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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1145
    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;
    }

1161
    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) {
1173
        av_log(s, AV_LOG_ERROR, "Cannot read RTMP handshake response\n");
1174
        return ret;
1175
    }
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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);
    AV_WB32(arraydata + 4, first_int);
    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;
    }
    if (zeroes)
        av_log(s, AV_LOG_WARNING, "Erroneous C1 Message zero != 0\n");
    /* 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;

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    if (pkt->data_size < 4) {
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        av_log(s, AV_LOG_ERROR,
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               "Too short chunk size change packet (%d)\n",
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               pkt->data_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])) < 0)
            return ret;
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        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;

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    if (pkt->data_size < 2) {
        av_log(s, AV_LOG_ERROR, "Too short ping packet (%d)\n",
               pkt->data_size);
        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)
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{
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    RTMPContext *rt = s->priv_data;

    if (pkt->data_size < 4) {
        av_log(s, AV_LOG_ERROR,
               "Client bandwidth report packet is less than 4 bytes long (%d)\n",
               pkt->data_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;

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

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static int handle_connect_error(URLContext *s, const char *desc)
{
    RTMPContext *rt = s->priv_data;
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    char buf[300], *ptr, authmod[15];
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    int i = 0, ret = 0;
    const char *user = "", *salt = "", *opaque = NULL,
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               *challenge = NULL, *cptr = NULL, *nonce = NULL;
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    if (!(cptr = strstr(desc, "authmod=adobe")) &&
        !(cptr = strstr(desc, "authmod=llnw"))) {
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        av_log(s, AV_LOG_ERROR,
               "Unknown connect error (unsupported authentication method?)\n");
        return AVERROR_UNKNOWN;
    }
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    cptr += strlen("authmod=");
    while (*cptr && *cptr != ' ' && i < sizeof(authmod) - 1)
        authmod[i++] = *cptr++;
    authmod[i] = '\0';
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    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),
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                 "?authmod=%s&user=%s", authmod, rt->username);
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        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';
        if (value)
            *value++ = '\0';
        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;
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        } else if (!strcmp(ptr, "nonce")) {
            nonce = value;
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        }
        ptr = next;
    }

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    if (!strcmp(authmod, "adobe")) {
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        if ((ret = do_adobe_auth(rt, user, salt, opaque, challenge)) < 0)
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            return ret;
    } else {
        if ((ret = do_llnw_auth(rt, user, nonce)) < 0)
            return ret;
    }
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    rt->auth_tried = 1;
    return 0;
}

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static int handle_invoke_error(URLContext *s, RTMPPacket *pkt)
1705
{
1706
    RTMPContext *rt = s->priv_data;
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    const uint8_t *data_end = pkt->data + pkt->data_size;
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    char *tracked_method = NULL;
    int level = AV_LOG_ERROR;
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    uint8_t tmpstr[256];
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    int ret;

    if ((ret = find_tracked_method(s, pkt, 9, &tracked_method)) < 0)
        return ret;
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    if (!ff_amf_get_field_value(pkt->data + 9, data_end,
                                "description", tmpstr, sizeof(tmpstr))) {
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        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. */
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            level = AV_LOG_WARNING;
            ret = 0;
1725 1726 1727 1728 1729 1730
        } else if (tracked_method && !strcmp(tracked_method, "connect")) {
            ret = handle_connect_error(s, tmpstr);
            if (!ret) {
                rt->do_reconnect = 1;
                level = AV_LOG_VERBOSE;
            }
1731
        } else
1732
            ret = AVERROR_UNKNOWN;
1733
        av_log(s, level, "Server error: %s\n", tmpstr);
1734 1735
    }

1736 1737
    av_free(tracked_method);
    return ret;
1738 1739
}

1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872
static int send_invoke_response(URLContext *s, RTMPPacket *pkt)
{
    RTMPContext *rt = s->priv_data;
    double seqnum;
    char filename[64];
    char command[64];
    char statusmsg[128];
    int stringlen;
    char *pchar;
    const uint8_t *p = pkt->data;
    uint8_t *pp      = NULL;
    RTMPPacket spkt  = { 0 };
    GetByteContext gbc;
    int ret;

    bytestream2_init(&gbc, p, pkt->data_size);
    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);
        // 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")) {
        PutByteContext pbc;
        // 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;
        }
        pp = spkt.data;
        bytestream2_init_writer(&pbc, pp, spkt.data_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,
                                   rt->prev_pkt[1]);
        ff_rtmp_packet_destroy(&spkt);
        if (ret < 0)
            return ret;

        // Send onStatus(NetStream.Publish.Start)
        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;
        }
        spkt.extra = pkt->extra;
        pp = spkt.data;
        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, "NetStream.Publish.Start");
        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_field_name(&pp, "clientid");
        snprintf(statusmsg, sizeof(statusmsg), "%s", LIBAVFORMAT_IDENT);
        ff_amf_write_string(&pp, statusmsg);
        ff_amf_write_object_end(&pp);

    } 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. */
        }
    }
    spkt.data_size = pp - spkt.data;
    ret = ff_rtmp_packet_write(rt->stream, &spkt, rt->out_chunk_size,
                               rt->prev_pkt[1]);
    ff_rtmp_packet_destroy(&spkt);
    return ret;
}

1873 1874 1875
static int handle_invoke_result(URLContext *s, RTMPPacket *pkt)
{
    RTMPContext *rt = s->priv_data;
1876 1877
    char *tracked_method = NULL;
    int ret = 0;
1878

1879
    if ((ret = find_tracked_method(s, pkt, 10, &tracked_method)) < 0)
1880
        return ret;
1881

1882 1883 1884 1885
    if (!tracked_method) {
        /* Ignore this reply when the current method is not tracked. */
        return ret;
    }
1886

1887 1888 1889 1890
    if (!memcmp(tracked_method, "connect", 7)) {
        if (!rt->is_input) {
            if ((ret = gen_release_stream(s, rt)) < 0)
                goto fail;
1891

1892 1893 1894 1895 1896
            if ((ret = gen_fcpublish_stream(s, rt)) < 0)
                goto fail;
        } else {
            if ((ret = gen_server_bw(s, rt)) < 0)
                goto fail;
1897 1898
        }

1899 1900
        if ((ret = gen_create_stream(s, rt)) < 0)
            goto fail;
1901

1902 1903 1904 1905 1906 1907 1908 1909 1910
        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;
1911
            }
1912
        }
1913 1914 1915 1916 1917 1918
    } else if (!memcmp(tracked_method, "createStream", 12)) {
        //extract a number from the result
        if (pkt->data[10] || pkt->data[19] != 5 || pkt->data[20]) {
            av_log(s, AV_LOG_WARNING, "Unexpected reply on connect()\n");
        } else {
            rt->main_channel_id = av_int2double(AV_RB64(pkt->data + 21));
1919
        }
1920 1921 1922 1923 1924 1925 1926 1927 1928

        if (!rt->is_input) {
            if ((ret = gen_publish(s, rt)) < 0)
                goto fail;
        } else {
            if ((ret = gen_play(s, rt)) < 0)
                goto fail;
            if ((ret = gen_buffer_time(s, rt)) < 0)
                goto fail;
1929
        }
1930 1931 1932 1933 1934 1935 1936
    }

fail:
    av_free(tracked_method);
    return ret;
}

1937
static int handle_invoke_status(URLContext *s, RTMPPacket *pkt)
1938
{
1939
    RTMPContext *rt = s->priv_data;
1940 1941 1942
    const uint8_t *data_end = pkt->data + pkt->data_size;
    const uint8_t *ptr = pkt->data + 11;
    uint8_t tmpstr[256];
1943
    int i, t;
1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971

    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")) {
        if (!ff_amf_get_field_value(ptr, data_end,
                                    "description", tmpstr, sizeof(tmpstr)))
            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;

    return 0;
}

static int handle_invoke(URLContext *s, RTMPPacket *pkt)
{
    RTMPContext *rt = s->priv_data;
1972
    int ret = 0;
1973

1974 1975
    //TODO: check for the messages sent for wrong state?
    if (!memcmp(pkt->data, "\002\000\006_error", 9)) {
1976 1977
        if ((ret = handle_invoke_error(s, pkt)) < 0)
            return ret;
1978
    } else if (!memcmp(pkt->data, "\002\000\007_result", 10)) {
1979
        if ((ret = handle_invoke_result(s, pkt)) < 0)
1980
            return ret;
1981
    } else if (!memcmp(pkt->data, "\002\000\010onStatus", 11)) {
1982 1983
        if ((ret = handle_invoke_status(s, pkt)) < 0)
            return ret;
1984 1985 1986
    } else if (!memcmp(pkt->data, "\002\000\010onBWDone", 11)) {
        if ((ret = gen_check_bw(s, rt)) < 0)
            return ret;
1987 1988 1989 1990 1991
    } else if (!memcmp(pkt->data, "\002\000\015releaseStream", 16) ||
               !memcmp(pkt->data, "\002\000\011FCPublish", 12)     ||
               !memcmp(pkt->data, "\002\000\007publish", 10)       ||
               !memcmp(pkt->data, "\002\000\010_checkbw", 11)      ||
               !memcmp(pkt->data, "\002\000\014createStream", 15)) {
1992
        if ((ret = send_invoke_response(s, pkt)) < 0)
1993
            return ret;
1994 1995
    }

1996
    return ret;
1997 1998
}

1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059
static int handle_notify(URLContext *s, RTMPPacket *pkt) {
    RTMPContext *rt  = s->priv_data;
    const uint8_t *p = NULL;
    uint8_t *cp      = NULL;
    uint8_t commandbuffer[64];
    char statusmsg[128];
    int stringlen;
    GetByteContext gbc;
    PutByteContext pbc;
    uint32_t ts;
    int old_flv_size;
    const uint8_t *datatowrite;
    unsigned datatowritelength;

    p = pkt->data;
    bytestream2_init(&gbc, p, pkt->data_size);
    if (ff_amf_read_string(&gbc, commandbuffer, sizeof(commandbuffer),
                           &stringlen))
        return AVERROR_INVALIDDATA;
    if (!strcmp(commandbuffer, "@setDataFrame")) {
        datatowrite       = gbc.buffer;
        datatowritelength = bytestream2_get_bytes_left(&gbc);
        if (ff_amf_read_string(&gbc, statusmsg,
                               sizeof(statusmsg), &stringlen))
            return AVERROR_INVALIDDATA;
        if (strcmp(statusmsg, "onMetaData")) {
            av_log(s, AV_LOG_INFO, "Expecting onMetadata but got %s\n",
                   statusmsg);
            return 0;
        }

        /* Provide ECMAArray to flv */
        ts = pkt->timestamp;

        // generate packet header and put data into buffer for FLV demuxer
        if (rt->flv_off < rt->flv_size) {
            old_flv_size  = rt->flv_size;
            rt->flv_size += datatowritelength + 15;
        } else {
            old_flv_size = 0;
            rt->flv_size = datatowritelength + 15;
            rt->flv_off  = 0;
        }

        cp = av_realloc(rt->flv_data, rt->flv_size);
        if (!cp)
            return AVERROR(ENOMEM);
        rt->flv_data = cp;
        bytestream2_init_writer(&pbc, cp, rt->flv_size);
        bytestream2_skip_p(&pbc, old_flv_size);
        bytestream2_put_byte(&pbc, pkt->type);
        bytestream2_put_be24(&pbc, datatowritelength);
        bytestream2_put_be24(&pbc, ts);
        bytestream2_put_byte(&pbc, ts >> 24);
        bytestream2_put_be24(&pbc, 0);
        bytestream2_put_buffer(&pbc, datatowrite, datatowritelength);
        bytestream2_put_be32(&pbc, 0);
    }
    return 0;
}

2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074
/**
 * 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) {
2075 2076 2077
    case RTMP_PT_BYTES_READ:
        av_dlog(s, "received bytes read report\n");
        break;
2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096
    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;
2097
        break;
2098 2099
    case RTMP_PT_VIDEO:
    case RTMP_PT_AUDIO:
2100
    case RTMP_PT_METADATA:
2101
    case RTMP_PT_NOTIFY:
2102
        /* Audio, Video and Metadata packets are parsed in get_packet() */
2103
        break;
2104 2105 2106
    default:
        av_log(s, AV_LOG_VERBOSE, "Unknown packet type received 0x%02X\n", pkt->type);
        break;
2107 2108 2109 2110 2111
    }
    return 0;
}

/**
2112
 * Interact with the server by receiving and sending RTMP packets until
2113 2114 2115
 * there is some significant data (media data or expected status notification).
 *
 * @param s          reading context
2116 2117 2118 2119
 * @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)
2120 2121 2122 2123 2124 2125
 * @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;
2126 2127 2128 2129
    uint8_t *p;
    const uint8_t *next;
    uint32_t data_size;
    uint32_t ts, cts, pts=0;
2130

2131 2132 2133
    if (rt->state == STATE_STOPPED)
        return AVERROR_EOF;

2134
    for (;;) {
2135
        RTMPPacket rpkt = { 0 };
2136
        if ((ret = ff_rtmp_packet_read(rt->stream, &rpkt,
2137
                                       rt->in_chunk_size, rt->prev_pkt[0])) <= 0) {
2138
            if (ret == 0) {
2139 2140 2141 2142 2143
                return AVERROR(EAGAIN);
            } else {
                return AVERROR(EIO);
            }
        }
2144
        rt->bytes_read += ret;
2145
        if (rt->bytes_read - rt->last_bytes_read > rt->client_report_size) {
2146
            av_log(s, AV_LOG_DEBUG, "Sending bytes read report\n");
2147 2148
            if ((ret = gen_bytes_read(s, rt, rpkt.timestamp + 1)) < 0)
                return ret;
2149 2150
            rt->last_bytes_read = rt->bytes_read;
        }
2151 2152 2153 2154

        ret = rtmp_parse_result(s, rt, &rpkt);
        if (ret < 0) {//serious error in current packet
            ff_rtmp_packet_destroy(&rpkt);
2155
            return ret;
2156
        }
2157 2158 2159 2160
        if (rt->do_reconnect && for_header) {
            ff_rtmp_packet_destroy(&rpkt);
            return 0;
        }
2161 2162 2163 2164
        if (rt->state == STATE_STOPPED) {
            ff_rtmp_packet_destroy(&rpkt);
            return AVERROR_EOF;
        }
2165 2166 2167
        if (for_header && (rt->state == STATE_PLAYING    ||
                           rt->state == STATE_PUBLISHING ||
                           rt->state == STATE_RECEIVING)) {
2168 2169 2170
            ff_rtmp_packet_destroy(&rpkt);
            return 0;
        }
2171
        if (!rpkt.data_size || !rt->is_input) {
2172 2173 2174 2175
            ff_rtmp_packet_destroy(&rpkt);
            continue;
        }
        if (rpkt.type == RTMP_PT_VIDEO || rpkt.type == RTMP_PT_AUDIO ||
2176
           (rpkt.type == RTMP_PT_NOTIFY && !memcmp("\002\000\012onMetaData", rpkt.data, 13))) {
2177
            ts = rpkt.timestamp;
2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191

            // generate packet header and put data into buffer for FLV demuxer
            rt->flv_off  = 0;
            rt->flv_size = rpkt.data_size + 15;
            rt->flv_data = p = av_realloc(rt->flv_data, rt->flv_size);
            bytestream_put_byte(&p, rpkt.type);
            bytestream_put_be24(&p, rpkt.data_size);
            bytestream_put_be24(&p, ts);
            bytestream_put_byte(&p, ts >> 24);
            bytestream_put_be24(&p, 0);
            bytestream_put_buffer(&p, rpkt.data, rpkt.data_size);
            bytestream_put_be32(&p, 0);
            ff_rtmp_packet_destroy(&rpkt);
            return 0;
2192 2193 2194 2195 2196 2197 2198 2199
        } else if (rpkt.type == RTMP_PT_NOTIFY) {
            ret = handle_notify(s, &rpkt);
            ff_rtmp_packet_destroy(&rpkt);
            if (ret) {
                av_log(s, AV_LOG_ERROR, "Handle notify error\n");
                return ret;
            }
            return 0;
2200 2201 2202 2203 2204
        } else if (rpkt.type == RTMP_PT_METADATA) {
            // we got raw FLV data, make it available for FLV demuxer
            rt->flv_off  = 0;
            rt->flv_size = rpkt.data_size;
            rt->flv_data = av_realloc(rt->flv_data, rt->flv_size);
2205 2206 2207 2208 2209 2210 2211 2212
            /* rewrite timestamps */
            next = rpkt.data;
            ts = rpkt.timestamp;
            while (next - rpkt.data < rpkt.data_size - 11) {
                next++;
                data_size = bytestream_get_be24(&next);
                p=next;
                cts = bytestream_get_be24(&next);
2213
                cts |= bytestream_get_byte(&next) << 24;
2214 2215 2216 2217 2218 2219 2220 2221
                if (pts==0)
                    pts=cts;
                ts += cts - pts;
                pts = cts;
                bytestream_put_be24(&p, ts);
                bytestream_put_byte(&p, ts >> 24);
                next += data_size + 3 + 4;
            }
2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232
            memcpy(rt->flv_data, rpkt.data, rpkt.data_size);
            ff_rtmp_packet_destroy(&rpkt);
            return 0;
        }
        ff_rtmp_packet_destroy(&rpkt);
    }
}

static int rtmp_close(URLContext *h)
{
    RTMPContext *rt = h->priv_data;
2233
    int ret = 0;
2234

2235
    if (!rt->is_input) {
2236 2237 2238
        rt->flv_data = NULL;
        if (rt->out_pkt.data_size)
            ff_rtmp_packet_destroy(&rt->out_pkt);
2239
        if (rt->state > STATE_FCPUBLISH)
2240
            ret = gen_fcunpublish_stream(h, rt);
2241
    }
2242
    if (rt->state > STATE_HANDSHAKED)
2243
        ret = gen_delete_stream(h, rt);
2244

2245
    free_tracked_methods(rt);
2246
    av_freep(&rt->flv_data);
2247
    ffurl_close(rt->stream);
2248
    return ret;
2249 2250 2251
}

/**
2252
 * Open RTMP connection and verify that the stream can be played.
2253 2254 2255 2256 2257 2258 2259 2260 2261
 *
 * 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:")
 */
static int rtmp_open(URLContext *s, const char *uri, int flags)
{
2262
    RTMPContext *rt = s->priv_data;
2263
    char proto[8], hostname[256], path[1024], auth[100], *fname;
2264
    char *old_app;
2265
    uint8_t buf[2048];
2266
    int port;
2267
    AVDictionary *opts = NULL;
2268 2269
    int ret;

2270 2271 2272
    if (rt->listen_timeout > 0)
        rt->listen = 1;

2273
    rt->is_input = !(flags & AVIO_FLAG_WRITE);
2274

2275 2276
    av_url_split(proto, sizeof(proto), auth, sizeof(auth),
                 hostname, sizeof(hostname), &port,
Martin Storsjö's avatar
Martin Storsjö committed
2277
                 path, sizeof(path), s->filename);
2278

2279 2280 2281 2282 2283 2284 2285 2286 2287
    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));
        }
    }

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

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        /* open the http tunneling connection */
2298
        ff_url_join(buf, sizeof(buf), "ffrtmphttp", NULL, hostname, port, NULL);
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    } 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);
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    } else if (!strcmp(proto, "rtmpe") || (!strcmp(proto, "rtmpte"))) {
        if (!strcmp(proto, "rtmpte"))
            av_dict_set(&opts, "ffrtmpcrypt_tunneling", "1", 1);

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        /* open the encrypted connection */
        ff_url_join(buf, sizeof(buf), "ffrtmpcrypt", NULL, hostname, port, NULL);
        rt->encrypted = 1;
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    } else {
        /* open the tcp connection */
        if (port < 0)
            port = RTMP_DEFAULT_PORT;
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        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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    }
2322

2323
reconnect:
2324
    if ((ret = ffurl_open(&rt->stream, buf, AVIO_FLAG_READ_WRITE,
2325
                          &s->interrupt_callback, &opts)) < 0) {
2326
        av_log(s , AV_LOG_ERROR, "Cannot open connection %s\n", buf);
2327
        goto fail;
2328
    }
2329

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    if (rt->swfverify) {
        if ((ret = rtmp_calc_swfhash(s)) < 0)
            goto fail;
    }

2335
    rt->state = STATE_START;
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    if (!rt->listen && (ret = rtmp_handshake(s, rt)) < 0)
        goto fail;
    if (rt->listen && (ret = rtmp_server_handshake(s, rt)) < 0)
2339
        goto fail;
2340

2341 2342
    rt->out_chunk_size = 128;
    rt->in_chunk_size  = 128; // Probably overwritten later
2343
    rt->state = STATE_HANDSHAKED;
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    // 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) {
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        ret = AVERROR(ENOMEM);
        goto fail;
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    }

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    //extract "app" part from path
    if (!strncmp(path, "/ondemand/", 10)) {
        fname = path + 10;
        memcpy(rt->app, "ondemand", 9);
    } else {
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        char *next = *path ? path + 1 : path;
        char *p = strchr(next, '/');
2361
        if (!p) {
2362
            fname = next;
2363
            rt->app[0] = '\0';
2364
        } else {
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            // make sure we do not mismatch a playpath for an application instance
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            char *c = strchr(p + 1, ':');
            fname = strchr(p + 1, '/');
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            if (!fname || (c && c < fname)) {
2369
                fname = p + 1;
2370
                av_strlcpy(rt->app, path + 1, FFMIN(p - path, APP_MAX_LENGTH));
2371
            } else {
2372
                fname++;
2373
                av_strlcpy(rt->app, path + 1, FFMIN(fname - path - 1, APP_MAX_LENGTH));
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            }
        }
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    }
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    if (old_app) {
        // The name of application has been defined by the user, override it.
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        if (strlen(old_app) >= APP_MAX_LENGTH) {
            ret = AVERROR(EINVAL);
            goto fail;
        }
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        av_free(rt->app);
        rt->app = old_app;
    }

2388
    if (!rt->playpath) {
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        int len = strlen(fname);

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        rt->playpath = av_malloc(PLAYPATH_MAX_LENGTH);
        if (!rt->playpath) {
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            ret = AVERROR(ENOMEM);
            goto fail;
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        }

2397
        if (!strchr(fname, ':') && len >= 4 &&
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            (!strcmp(fname + len - 4, ".f4v") ||
             !strcmp(fname + len - 4, ".mp4"))) {
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            memcpy(rt->playpath, "mp4:", 5);
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        } else if (len >= 4 && !strcmp(fname + len - 4, ".flv")) {
2402
            fname[len - 4] = '\0';
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        } else {
            rt->playpath[0] = 0;
        }
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        av_strlcat(rt->playpath, fname, PLAYPATH_MAX_LENGTH);
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    }
2408

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    if (!rt->tcurl) {
        rt->tcurl = av_malloc(TCURL_MAX_LENGTH);
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        if (!rt->tcurl) {
            ret = AVERROR(ENOMEM);
            goto fail;
        }
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        ff_url_join(rt->tcurl, TCURL_MAX_LENGTH, proto, NULL, hostname,
                    port, "/%s", rt->app);
    }

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    if (!rt->flashver) {
        rt->flashver = av_malloc(FLASHVER_MAX_LENGTH);
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        if (!rt->flashver) {
            ret = AVERROR(ENOMEM);
            goto fail;
        }
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        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);
        }
    }

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    rt->client_report_size = 1048576;
    rt->bytes_read = 0;
    rt->last_bytes_read = 0;
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    rt->server_bw = 2500000;
2439

2440
    av_log(s, AV_LOG_DEBUG, "Proto = %s, path = %s, app = %s, fname = %s\n",
2441
           proto, path, rt->app, rt->playpath);
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    if (!rt->listen) {
        if ((ret = gen_connect(s, rt)) < 0)
            goto fail;
    } else {
        if (read_connect(s, s->priv_data) < 0)
            goto fail;
        rt->is_input = 1;
    }
2450

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    do {
        ret = get_packet(s, 1);
    } while (ret == EAGAIN);
    if (ret < 0)
        goto fail;
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    if (rt->do_reconnect) {
        ffurl_close(rt->stream);
        rt->stream       = NULL;
        rt->do_reconnect = 0;
        rt->nb_invokes   = 0;
        memset(rt->prev_pkt, 0, sizeof(rt->prev_pkt));
        free_tracked_methods(rt);
        goto reconnect;
    }

2467
    if (rt->is_input) {
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        // generate FLV header for demuxer
        rt->flv_size = 13;
        rt->flv_data = av_realloc(rt->flv_data, rt->flv_size);
        rt->flv_off  = 0;
        memcpy(rt->flv_data, "FLV\1\5\0\0\0\011\0\0\0\0", rt->flv_size);
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    } else {
        rt->flv_size = 0;
        rt->flv_data = NULL;
        rt->flv_off  = 0;
2477
        rt->skip_bytes = 13;
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    }

2480
    s->max_packet_size = rt->stream->max_packet_size;
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    s->is_streamed     = 1;
    return 0;

fail:
2485
    av_dict_free(&opts);
2486
    rtmp_close(s);
2487
    return ret;
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}

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;
2509
            return data_left;
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        }
        if ((ret = get_packet(s, 0)) < 0)
           return ret;
    }
    return orig_size;
}

2517
static int rtmp_write(URLContext *s, const uint8_t *buf, int size)
2518
{
2519
    RTMPContext *rt = s->priv_data;
2520 2521 2522 2523
    int size_temp = size;
    int pktsize, pkttype;
    uint32_t ts;
    const uint8_t *buf_temp = buf;
2524
    uint8_t c;
2525
    int ret;
2526 2527

    do {
2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 2538 2539 2540 2541 2542 2543
        if (rt->skip_bytes) {
            int skip = FFMIN(rt->skip_bytes, size_temp);
            buf_temp       += skip;
            size_temp      -= skip;
            rt->skip_bytes -= skip;
            continue;
        }

        if (rt->flv_header_bytes < 11) {
            const uint8_t *header = rt->flv_header;
            int copy = FFMIN(11 - rt->flv_header_bytes, size_temp);
            bytestream_get_buffer(&buf_temp, rt->flv_header + rt->flv_header_bytes, copy);
            rt->flv_header_bytes += copy;
            size_temp            -= copy;
            if (rt->flv_header_bytes < 11)
                break;
2544

2545 2546 2547 2548 2549
            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);
2550 2551 2552 2553 2554 2555 2556 2557 2558 2559 2560
            rt->flv_size = pktsize;

            //force 12bytes header
            if (((pkttype == RTMP_PT_VIDEO || pkttype == RTMP_PT_AUDIO) && ts == 0) ||
                pkttype == RTMP_PT_NOTIFY) {
                if (pkttype == RTMP_PT_NOTIFY)
                    pktsize += 16;
                rt->prev_pkt[1][RTMP_SOURCE_CHANNEL].channel_id = 0;
            }

            //this can be a big packet, it's better to send it right here
2561 2562 2563 2564
            if ((ret = ff_rtmp_packet_create(&rt->out_pkt, RTMP_SOURCE_CHANNEL,
                                             pkttype, ts, pktsize)) < 0)
                return ret;

2565 2566 2567 2568 2569 2570 2571 2572 2573 2574
            rt->out_pkt.extra = rt->main_channel_id;
            rt->flv_data = rt->out_pkt.data;

            if (pkttype == RTMP_PT_NOTIFY)
                ff_amf_write_string(&rt->flv_data, "@setDataFrame");
        }

        if (rt->flv_size - rt->flv_off > size_temp) {
            bytestream_get_buffer(&buf_temp, rt->flv_data + rt->flv_off, size_temp);
            rt->flv_off += size_temp;
2575
            size_temp = 0;
2576 2577
        } else {
            bytestream_get_buffer(&buf_temp, rt->flv_data + rt->flv_off, rt->flv_size - rt->flv_off);
2578
            size_temp   -= rt->flv_size - rt->flv_off;
2579 2580 2581 2582
            rt->flv_off += rt->flv_size - rt->flv_off;
        }

        if (rt->flv_off == rt->flv_size) {
2583 2584
            rt->skip_bytes = 4;

2585
            if ((ret = rtmp_send_packet(rt, &rt->out_pkt, 0)) < 0)
2586
                return ret;
2587 2588
            rt->flv_size = 0;
            rt->flv_off = 0;
2589
            rt->flv_header_bytes = 0;
2590
            rt->flv_nb_packets++;
2591
        }
2592
    } while (buf_temp - buf < size);
2593

2594 2595 2596 2597
    if (rt->flv_nb_packets < rt->flush_interval)
        return size;
    rt->flv_nb_packets = 0;

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    /* 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,
2616
                                                rt->in_chunk_size,
2617 2618 2619 2620 2621 2622 2623 2624 2625
                                                rt->prev_pkt[0], c)) <= 0)
             return ret;

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

        ff_rtmp_packet_destroy(&rpkt);
    }

2626
    return size;
2627 2628
}

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#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},
2635
    {"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},
2636
    {"rtmp_conn", "Append arbitrary AMF data to the Connect message", OFFSET(conn), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, DEC|ENC},
2637
    {"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},
2638 2639
    {"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"},
2640 2641 2642
    {"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"},
2643
    {"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},
2644
    {"rtmp_playpath", "Stream identifier to play or to publish", OFFSET(playpath), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, DEC|ENC},
2645
    {"rtmp_subscribe", "Name of live stream to subscribe to. Defaults to rtmp_playpath.", OFFSET(subscribe), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, DEC},
2646
    {"rtmp_swfhash", "SHA256 hash of the decompressed SWF file (32 bytes).", OFFSET(swfhash), AV_OPT_TYPE_BINARY, .flags = DEC},
2647
    {"rtmp_swfsize", "Size of the decompressed SWF file, required for SWFVerification.", OFFSET(swfsize), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, DEC},
2648
    {"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},
2649
    {"rtmp_swfverify", "URL to player swf file, compute hash/size automatically.", OFFSET(swfverify), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, DEC},
2650
    {"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},
2651 2652
    {"rtmp_listen", "Listen for incoming rtmp connections", OFFSET(listen), AV_OPT_TYPE_INT, {.i64 = 0}, INT_MIN, INT_MAX, DEC, "rtmp_listen" },
    {"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" },
2653 2654 2655
    { NULL },
};

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#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,         \
};                                               \
                                                 \
URLProtocol ff_##flavor##_protocol = {           \
    .name           = #flavor,                   \
    .url_open       = rtmp_open,                 \
    .url_read       = rtmp_read,                 \
    .url_write      = rtmp_write,                \
    .url_close      = rtmp_close,                \
    .priv_data_size = sizeof(RTMPContext),       \
    .flags          = URL_PROTOCOL_FLAG_NETWORK, \
    .priv_data_class= &flavor##_class,           \
2673
};
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RTMP_PROTOCOL(rtmp)
RTMP_PROTOCOL(rtmpe)
RTMP_PROTOCOL(rtmps)
RTMP_PROTOCOL(rtmpt)
RTMP_PROTOCOL(rtmpte)
RTMP_PROTOCOL(rtmpts)