libavformat/rtp.c

   1 /*
   2  * RTP input/output format
   3  * Copyright (c) 2002 Fabrice Bellard
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 #include "libavcodec/get_bits.h"
  23 #include "avformat.h"
  24
  25 #include <unistd.h>
  26 #include "network.h"
  27
  28 #include "rtp.h"
  29
  30 //#define DEBUG
  31
  32 /* from http://www.iana.org/assignments/rtp-parameters last updated 05 January 2005 */
  33 /* payload types >= 96 are dynamic;
  34  * payload types between 72 and 76 are reserved for RTCP conflict avoidance;
  35  * all the other payload types not present in the table are unassigned or
  36  * reserved
  37  */
  38 static const struct
  39 {
  40     int pt;
  41     const char enc_name[6];
  42     enum CodecType codec_type;
  43     enum CodecID codec_id;
  44     int clock_rate;
  45     int audio_channels;
  46 } AVRtpPayloadTypes[]=
  47 {
  48   {0, "PCMU",        CODEC_TYPE_AUDIO,   CODEC_ID_PCM_MULAW, 8000, 1},
  49   {3, "GSM",         CODEC_TYPE_AUDIO,   CODEC_ID_NONE, 8000, 1},
  50   {4, "G723",        CODEC_TYPE_AUDIO,   CODEC_ID_NONE, 8000, 1},
  51   {5, "DVI4",        CODEC_TYPE_AUDIO,   CODEC_ID_NONE, 8000, 1},
  52   {6, "DVI4",        CODEC_TYPE_AUDIO,   CODEC_ID_NONE, 16000, 1},
  53   {7, "LPC",         CODEC_TYPE_AUDIO,   CODEC_ID_NONE, 8000, 1},
  54   {8, "PCMA",        CODEC_TYPE_AUDIO,   CODEC_ID_PCM_ALAW, 8000, 1},
  55   {9, "G722",        CODEC_TYPE_AUDIO,   CODEC_ID_NONE, 8000, 1},
  56   {10, "L16",        CODEC_TYPE_AUDIO,   CODEC_ID_PCM_S16BE, 44100, 2},
  57   {11, "L16",        CODEC_TYPE_AUDIO,   CODEC_ID_PCM_S16BE, 44100, 1},
  58   {12, "QCELP",      CODEC_TYPE_AUDIO,   CODEC_ID_QCELP, 8000, 1},
  59   {13, "CN",         CODEC_TYPE_AUDIO,   CODEC_ID_NONE, 8000, 1},
  60   {14, "MPA",        CODEC_TYPE_AUDIO,   CODEC_ID_MP2, -1, -1},
  61   {14, "MPA",        CODEC_TYPE_AUDIO,   CODEC_ID_MP3, -1, -1},
  62   {15, "G728",       CODEC_TYPE_AUDIO,   CODEC_ID_NONE, 8000, 1},
  63   {16, "DVI4",       CODEC_TYPE_AUDIO,   CODEC_ID_NONE, 11025, 1},
  64   {17, "DVI4",       CODEC_TYPE_AUDIO,   CODEC_ID_NONE, 22050, 1},
  65   {18, "G729",       CODEC_TYPE_AUDIO,   CODEC_ID_NONE, 8000, 1},
  66   {25, "CelB",       CODEC_TYPE_VIDEO,   CODEC_ID_NONE, 90000, -1},
  67   {26, "JPEG",       CODEC_TYPE_VIDEO,   CODEC_ID_MJPEG, 90000, -1},
  68   {28, "nv",         CODEC_TYPE_VIDEO,   CODEC_ID_NONE, 90000, -1},
  69   {31, "H261",       CODEC_TYPE_VIDEO,   CODEC_ID_H261, 90000, -1},
  70   {32, "MPV",        CODEC_TYPE_VIDEO,   CODEC_ID_MPEG1VIDEO, 90000, -1},
  71   {32, "MPV",        CODEC_TYPE_VIDEO,   CODEC_ID_MPEG2VIDEO, 90000, -1},
  72   {33, "MP2T",       CODEC_TYPE_DATA,    CODEC_ID_MPEG2TS, 90000, -1},
  73   {34, "H263",       CODEC_TYPE_VIDEO,   CODEC_ID_H263, 90000, -1},
  74   {-1, "",           CODEC_TYPE_UNKNOWN, CODEC_ID_NONE, -1, -1}
  75 };
  76
  77 int ff_rtp_get_codec_info(AVCodecContext *codec, int payload_type)
  78 {
  79     int i = 0;
  80
  81     for (i = 0; AVRtpPayloadTypes[i].pt >= 0; i++)
  82         if (AVRtpPayloadTypes[i].pt == payload_type) {
  83             if (AVRtpPayloadTypes[i].codec_id != CODEC_ID_NONE) {
  84                 codec->codec_type = AVRtpPayloadTypes[i].codec_type;
  85                 codec->codec_id = AVRtpPayloadTypes[i].codec_id;
  86                 if (AVRtpPayloadTypes[i].audio_channels > 0)
  87                     codec->channels = AVRtpPayloadTypes[i].audio_channels;
  88                 if (AVRtpPayloadTypes[i].clock_rate > 0)
  89                     codec->sample_rate = AVRtpPayloadTypes[i].clock_rate;
  90                 return 0;
  91             }
  92         }
  93     return -1;
  94 }
  95
  96 int ff_rtp_get_payload_type(AVCodecContext *codec)
  97 {
  98     int i, payload_type;
  99
 100     /* compute the payload type */
 101     for (payload_type = -1, i = 0; AVRtpPayloadTypes[i].pt >= 0; ++i)
 102         if (AVRtpPayloadTypes[i].codec_id == codec->codec_id) {
 103             if (codec->codec_id == CODEC_ID_H263)
 104                 continue;
 105             if (codec->codec_id == CODEC_ID_PCM_S16BE)
 106                 if (codec->channels != AVRtpPayloadTypes[i].audio_channels)
 107                     continue;
 108             payload_type = AVRtpPayloadTypes[i].pt;
 109         }
 110     return payload_type;
 111 }
 112
 113 const char *ff_rtp_enc_name(int payload_type)
 114 {
 115     int i;
 116
 117     for (i = 0; AVRtpPayloadTypes[i].pt >= 0; i++)
 118         if (AVRtpPayloadTypes[i].pt == payload_type) {
 119             return AVRtpPayloadTypes[i].enc_name;
 120         }
 121
 122     return "";
 123 }
 124
 125 enum CodecID ff_rtp_codec_id(const char *buf, enum CodecType codec_type)
 126 {
 127     int i;
 128
 129     for (i = 0; AVRtpPayloadTypes[i].pt >= 0; i++)
 130         if (!strcmp(buf, AVRtpPayloadTypes[i].enc_name) && (codec_type == AVRtpPayloadTypes[i].codec_type)){
 131             return AVRtpPayloadTypes[i].codec_id;
 132         }
 133
 134     return CODEC_ID_NONE;
 135 }