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ffmpeg / libavformat / rtp.c @ 72415b2a

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/*
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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.
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 *
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 * 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
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 * 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
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * 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 "avformat.h"
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#include "rtp.h"
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//#define DEBUG
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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;
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 * payload types between 72 and 76 are reserved for RTCP conflict avoidance;
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 * all the other payload types not present in the table are unassigned or
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 * reserved
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 */
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static const struct
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{
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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 CodecID codec_id;
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    int clock_rate;
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    int audio_channels;
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} AVRtpPayloadTypes[]=
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{
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  {0, "PCMU",        AVMEDIA_TYPE_AUDIO,   CODEC_ID_PCM_MULAW, 8000, 1},
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  {3, "GSM",         AVMEDIA_TYPE_AUDIO,   CODEC_ID_NONE, 8000, 1},
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  {4, "G723",        AVMEDIA_TYPE_AUDIO,   CODEC_ID_NONE, 8000, 1},
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  {5, "DVI4",        AVMEDIA_TYPE_AUDIO,   CODEC_ID_NONE, 8000, 1},
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  {6, "DVI4",        AVMEDIA_TYPE_AUDIO,   CODEC_ID_NONE, 16000, 1},
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  {7, "LPC",         AVMEDIA_TYPE_AUDIO,   CODEC_ID_NONE, 8000, 1},
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  {8, "PCMA",        AVMEDIA_TYPE_AUDIO,   CODEC_ID_PCM_ALAW, 8000, 1},
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  {9, "G722",        AVMEDIA_TYPE_AUDIO,   CODEC_ID_NONE, 8000, 1},
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  {10, "L16",        AVMEDIA_TYPE_AUDIO,   CODEC_ID_PCM_S16BE, 44100, 2},
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  {11, "L16",        AVMEDIA_TYPE_AUDIO,   CODEC_ID_PCM_S16BE, 44100, 1},
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  {12, "QCELP",      AVMEDIA_TYPE_AUDIO,   CODEC_ID_QCELP, 8000, 1},
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  {13, "CN",         AVMEDIA_TYPE_AUDIO,   CODEC_ID_NONE, 8000, 1},
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  {14, "MPA",        AVMEDIA_TYPE_AUDIO,   CODEC_ID_MP2, -1, -1},
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  {14, "MPA",        AVMEDIA_TYPE_AUDIO,   CODEC_ID_MP3, -1, -1},
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  {15, "G728",       AVMEDIA_TYPE_AUDIO,   CODEC_ID_NONE, 8000, 1},
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  {16, "DVI4",       AVMEDIA_TYPE_AUDIO,   CODEC_ID_NONE, 11025, 1},
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  {17, "DVI4",       AVMEDIA_TYPE_AUDIO,   CODEC_ID_NONE, 22050, 1},
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  {18, "G729",       AVMEDIA_TYPE_AUDIO,   CODEC_ID_NONE, 8000, 1},
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  {25, "CelB",       AVMEDIA_TYPE_VIDEO,   CODEC_ID_NONE, 90000, -1},
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  {26, "JPEG",       AVMEDIA_TYPE_VIDEO,   CODEC_ID_MJPEG, 90000, -1},
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  {28, "nv",         AVMEDIA_TYPE_VIDEO,   CODEC_ID_NONE, 90000, -1},
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  {31, "H261",       AVMEDIA_TYPE_VIDEO,   CODEC_ID_H261, 90000, -1},
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  {32, "MPV",        AVMEDIA_TYPE_VIDEO,   CODEC_ID_MPEG1VIDEO, 90000, -1},
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  {32, "MPV",        AVMEDIA_TYPE_VIDEO,   CODEC_ID_MPEG2VIDEO, 90000, -1},
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  {33, "MP2T",       AVMEDIA_TYPE_DATA,    CODEC_ID_MPEG2TS, 90000, -1},
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  {34, "H263",       AVMEDIA_TYPE_VIDEO,   CODEC_ID_H263, 90000, -1},
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  {-1, "",           AVMEDIA_TYPE_UNKNOWN, 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; AVRtpPayloadTypes[i].pt >= 0; i++)
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        if (AVRtpPayloadTypes[i].pt == payload_type) {
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            if (AVRtpPayloadTypes[i].codec_id != CODEC_ID_NONE) {
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                codec->codec_type = AVRtpPayloadTypes[i].codec_type;
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                codec->codec_id = AVRtpPayloadTypes[i].codec_id;
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                if (AVRtpPayloadTypes[i].audio_channels > 0)
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                    codec->channels = AVRtpPayloadTypes[i].audio_channels;
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                if (AVRtpPayloadTypes[i].clock_rate > 0)
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                    codec->sample_rate = AVRtpPayloadTypes[i].clock_rate;
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                return 0;
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            }
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        }
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    return -1;
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}
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int ff_rtp_get_payload_type(AVCodecContext *codec)
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{
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    int i, payload_type;
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    /* compute the payload type */
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    for (payload_type = -1, i = 0; AVRtpPayloadTypes[i].pt >= 0; ++i)
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        if (AVRtpPayloadTypes[i].codec_id == codec->codec_id) {
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            if (codec->codec_id == CODEC_ID_H263)
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                continue;
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            if (codec->codec_id == CODEC_ID_PCM_S16BE)
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                if (codec->channels != AVRtpPayloadTypes[i].audio_channels)
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                    continue;
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            payload_type = AVRtpPayloadTypes[i].pt;
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        }
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    return payload_type;
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}
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const char *ff_rtp_enc_name(int payload_type)
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{
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    int i;
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    for (i = 0; AVRtpPayloadTypes[i].pt >= 0; i++)
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        if (AVRtpPayloadTypes[i].pt == payload_type) {
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            return AVRtpPayloadTypes[i].enc_name;
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        }
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    return "";
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}
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enum CodecID ff_rtp_codec_id(const char *buf, enum AVMediaType codec_type)
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{
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    int i;
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    for (i = 0; AVRtpPayloadTypes[i].pt >= 0; i++)
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        if (!strcmp(buf, AVRtpPayloadTypes[i].enc_name) && (codec_type == AVRtpPayloadTypes[i].codec_type)){
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            return AVRtpPayloadTypes[i].codec_id;
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        }
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    return CODEC_ID_NONE;
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}