rtp.c 6.29 KB
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/*
 * RTP input/output format
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 * Copyright (c) 2002 Fabrice Bellard
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 *
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 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * 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
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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#include "libavutil/avstring.h"
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#include "libavutil/opt.h"
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#include "avformat.h"

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#include "rtp.h"
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/* from http://www.iana.org/assignments/rtp-parameters last updated 05 January 2005 */
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/* payload types >= 96 are dynamic;
 * payload types between 72 and 76 are reserved for RTCP conflict avoidance;
 * all the other payload types not present in the table are unassigned or
 * reserved
 */
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static const struct {
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    int pt;
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    const char enc_name[6];
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    enum AVMediaType codec_type;
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    enum AVCodecID codec_id;
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    int clock_rate;
    int audio_channels;
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} rtp_payload_types[] = {
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  {0, "PCMU",        AVMEDIA_TYPE_AUDIO,   AV_CODEC_ID_PCM_MULAW, 8000, 1},
  {3, "GSM",         AVMEDIA_TYPE_AUDIO,   AV_CODEC_ID_NONE, 8000, 1},
  {4, "G723",        AVMEDIA_TYPE_AUDIO,   AV_CODEC_ID_G723_1, 8000, 1},
  {5, "DVI4",        AVMEDIA_TYPE_AUDIO,   AV_CODEC_ID_NONE, 8000, 1},
  {6, "DVI4",        AVMEDIA_TYPE_AUDIO,   AV_CODEC_ID_NONE, 16000, 1},
  {7, "LPC",         AVMEDIA_TYPE_AUDIO,   AV_CODEC_ID_NONE, 8000, 1},
  {8, "PCMA",        AVMEDIA_TYPE_AUDIO,   AV_CODEC_ID_PCM_ALAW, 8000, 1},
  {9, "G722",        AVMEDIA_TYPE_AUDIO,   AV_CODEC_ID_ADPCM_G722, 8000, 1},
  {10, "L16",        AVMEDIA_TYPE_AUDIO,   AV_CODEC_ID_PCM_S16BE, 44100, 2},
  {11, "L16",        AVMEDIA_TYPE_AUDIO,   AV_CODEC_ID_PCM_S16BE, 44100, 1},
  {12, "QCELP",      AVMEDIA_TYPE_AUDIO,   AV_CODEC_ID_QCELP, 8000, 1},
  {13, "CN",         AVMEDIA_TYPE_AUDIO,   AV_CODEC_ID_NONE, 8000, 1},
  {14, "MPA",        AVMEDIA_TYPE_AUDIO,   AV_CODEC_ID_MP2, -1, -1},
  {14, "MPA",        AVMEDIA_TYPE_AUDIO,   AV_CODEC_ID_MP3, -1, -1},
  {15, "G728",       AVMEDIA_TYPE_AUDIO,   AV_CODEC_ID_NONE, 8000, 1},
  {16, "DVI4",       AVMEDIA_TYPE_AUDIO,   AV_CODEC_ID_NONE, 11025, 1},
  {17, "DVI4",       AVMEDIA_TYPE_AUDIO,   AV_CODEC_ID_NONE, 22050, 1},
  {18, "G729",       AVMEDIA_TYPE_AUDIO,   AV_CODEC_ID_NONE, 8000, 1},
  {25, "CelB",       AVMEDIA_TYPE_VIDEO,   AV_CODEC_ID_NONE, 90000, -1},
  {26, "JPEG",       AVMEDIA_TYPE_VIDEO,   AV_CODEC_ID_MJPEG, 90000, -1},
  {28, "nv",         AVMEDIA_TYPE_VIDEO,   AV_CODEC_ID_NONE, 90000, -1},
  {31, "H261",       AVMEDIA_TYPE_VIDEO,   AV_CODEC_ID_H261, 90000, -1},
  {32, "MPV",        AVMEDIA_TYPE_VIDEO,   AV_CODEC_ID_MPEG1VIDEO, 90000, -1},
  {32, "MPV",        AVMEDIA_TYPE_VIDEO,   AV_CODEC_ID_MPEG2VIDEO, 90000, -1},
  {33, "MP2T",       AVMEDIA_TYPE_DATA,    AV_CODEC_ID_MPEG2TS, 90000, -1},
  {34, "H263",       AVMEDIA_TYPE_VIDEO,   AV_CODEC_ID_H263, 90000, -1},
  {-1, "",           AVMEDIA_TYPE_UNKNOWN, AV_CODEC_ID_NONE, -1, -1}
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};

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int ff_rtp_get_codec_info(AVCodecContext *codec, int payload_type)
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{
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    int i = 0;

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    for (i = 0; rtp_payload_types[i].pt >= 0; i++)
        if (rtp_payload_types[i].pt == payload_type) {
            if (rtp_payload_types[i].codec_id != AV_CODEC_ID_NONE) {
                codec->codec_type = rtp_payload_types[i].codec_type;
                codec->codec_id = rtp_payload_types[i].codec_id;
                if (rtp_payload_types[i].audio_channels > 0)
                    codec->channels = rtp_payload_types[i].audio_channels;
                if (rtp_payload_types[i].clock_rate > 0)
                    codec->sample_rate = rtp_payload_types[i].clock_rate;
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                return 0;
            }
        }
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    return -1;
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}

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int ff_rtp_get_payload_type(AVFormatContext *fmt,
                            AVCodecContext *codec, int idx)
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{
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    int i;
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    AVOutputFormat *ofmt = fmt ? fmt->oformat : NULL;

    /* Was the payload type already specified for the RTP muxer? */
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    if (ofmt && ofmt->priv_class && fmt->priv_data) {
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        int64_t payload_type;
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        if (av_opt_get_int(fmt->priv_data, "payload_type", 0, &payload_type) >= 0 &&
            payload_type >= 0)
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            return (int)payload_type;
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    }
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    /* static payload type */
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    for (i = 0; rtp_payload_types[i].pt >= 0; ++i)
        if (rtp_payload_types[i].codec_id == codec->codec_id) {
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            if (codec->codec_id == AV_CODEC_ID_H263 && (!fmt || !fmt->oformat ||
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                !fmt->oformat->priv_class || !fmt->priv_data ||
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                !av_opt_flag_is_set(fmt->priv_data, "rtpflags", "rfc2190")))
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                continue;
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            /* G722 has 8000 as nominal rate even if the sample rate is 16000,
             * see section 4.5.2 in RFC 3551. */
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            if (codec->codec_id == AV_CODEC_ID_ADPCM_G722 &&
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                codec->sample_rate == 16000 && codec->channels == 1)
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                return rtp_payload_types[i].pt;
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            if (codec->codec_type == AVMEDIA_TYPE_AUDIO &&
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                ((rtp_payload_types[i].clock_rate > 0 &&
                  codec->sample_rate != rtp_payload_types[i].clock_rate) ||
                 (rtp_payload_types[i].audio_channels > 0 &&
                  codec->channels != rtp_payload_types[i].audio_channels)))
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                continue;
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            return rtp_payload_types[i].pt;
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        }
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    if (idx < 0)
        idx = codec->codec_type == AVMEDIA_TYPE_AUDIO;

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    /* dynamic payload type */
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    return RTP_PT_PRIVATE + idx;
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}

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const char *ff_rtp_enc_name(int payload_type)
{
    int i;

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    for (i = 0; rtp_payload_types[i].pt >= 0; i++)
        if (rtp_payload_types[i].pt == payload_type)
            return rtp_payload_types[i].enc_name;
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    return "";
}

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enum AVCodecID ff_rtp_codec_id(const char *buf, enum AVMediaType codec_type)
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{
    int i;

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    for (i = 0; rtp_payload_types[i].pt >= 0; i++)
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        if (!av_strcasecmp(buf, rtp_payload_types[i].enc_name) && (codec_type == rtp_payload_types[i].codec_type))
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            return rtp_payload_types[i].codec_id;
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    return AV_CODEC_ID_NONE;
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}