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libavformat/rtp.c

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00001 /*
00002  * RTP input/output format
00003  * Copyright (c) 2002 Fabrice Bellard
00004  *
00005  * This file is part of FFmpeg.
00006  *
00007  * FFmpeg is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * FFmpeg is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with FFmpeg; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00022 #include "libavcodec/bitstream.h"
00023 #include "avformat.h"
00024 
00025 #include <unistd.h>
00026 #include "network.h"
00027 
00028 #include "rtp.h"
00029 
00030 //#define DEBUG
00031 
00032 /* from http://www.iana.org/assignments/rtp-parameters last updated 05 January 2005 */
00033 /* payload types >= 96 are dynamic;
00034  * payload types between 72 and 76 are reserved for RTCP conflict avoidance;
00035  * all the other payload types not present in the table are unassigned or
00036  * reserved
00037  */
00038 static const struct
00039 {
00040     int pt;
00041     const char enc_name[6];
00042     enum CodecType codec_type;
00043     enum CodecID codec_id;
00044     int clock_rate;
00045     int audio_channels;
00046 } AVRtpPayloadTypes[]=
00047 {
00048   {0, "PCMU",        CODEC_TYPE_AUDIO,   CODEC_ID_PCM_MULAW, 8000, 1},
00049   {3, "GSM",         CODEC_TYPE_AUDIO,   CODEC_ID_NONE, 8000, 1},
00050   {4, "G723",        CODEC_TYPE_AUDIO,   CODEC_ID_NONE, 8000, 1},
00051   {5, "DVI4",        CODEC_TYPE_AUDIO,   CODEC_ID_NONE, 8000, 1},
00052   {6, "DVI4",        CODEC_TYPE_AUDIO,   CODEC_ID_NONE, 16000, 1},
00053   {7, "LPC",         CODEC_TYPE_AUDIO,   CODEC_ID_NONE, 8000, 1},
00054   {8, "PCMA",        CODEC_TYPE_AUDIO,   CODEC_ID_PCM_ALAW, 8000, 1},
00055   {9, "G722",        CODEC_TYPE_AUDIO,   CODEC_ID_NONE, 8000, 1},
00056   {10, "L16",        CODEC_TYPE_AUDIO,   CODEC_ID_PCM_S16BE, 44100, 2},
00057   {11, "L16",        CODEC_TYPE_AUDIO,   CODEC_ID_PCM_S16BE, 44100, 1},
00058   {12, "QCELP",      CODEC_TYPE_AUDIO,   CODEC_ID_QCELP, 8000, 1},
00059   {13, "CN",         CODEC_TYPE_AUDIO,   CODEC_ID_NONE, 8000, 1},
00060   {14, "MPA",        CODEC_TYPE_AUDIO,   CODEC_ID_MP2, -1, -1},
00061   {14, "MPA",        CODEC_TYPE_AUDIO,   CODEC_ID_MP3, -1, -1},
00062   {15, "G728",       CODEC_TYPE_AUDIO,   CODEC_ID_NONE, 8000, 1},
00063   {16, "DVI4",       CODEC_TYPE_AUDIO,   CODEC_ID_NONE, 11025, 1},
00064   {17, "DVI4",       CODEC_TYPE_AUDIO,   CODEC_ID_NONE, 22050, 1},
00065   {18, "G729",       CODEC_TYPE_AUDIO,   CODEC_ID_NONE, 8000, 1},
00066   {25, "CelB",       CODEC_TYPE_VIDEO,   CODEC_ID_NONE, 90000, -1},
00067   {26, "JPEG",       CODEC_TYPE_VIDEO,   CODEC_ID_MJPEG, 90000, -1},
00068   {28, "nv",         CODEC_TYPE_VIDEO,   CODEC_ID_NONE, 90000, -1},
00069   {31, "H261",       CODEC_TYPE_VIDEO,   CODEC_ID_H261, 90000, -1},
00070   {32, "MPV",        CODEC_TYPE_VIDEO,   CODEC_ID_MPEG1VIDEO, 90000, -1},
00071   {32, "MPV",        CODEC_TYPE_VIDEO,   CODEC_ID_MPEG2VIDEO, 90000, -1},
00072   {33, "MP2T",       CODEC_TYPE_DATA,    CODEC_ID_MPEG2TS, 90000, -1},
00073   {34, "H263",       CODEC_TYPE_VIDEO,   CODEC_ID_H263, 90000, -1},
00074   {-1, "",           CODEC_TYPE_UNKNOWN, CODEC_ID_NONE, -1, -1}
00075 };
00076 
00077 int ff_rtp_get_codec_info(AVCodecContext *codec, int payload_type)
00078 {
00079     int i = 0;
00080 
00081     for (i = 0; AVRtpPayloadTypes[i].pt >= 0; i++)
00082         if (AVRtpPayloadTypes[i].pt == payload_type) {
00083             if (AVRtpPayloadTypes[i].codec_id != CODEC_ID_NONE) {
00084                 codec->codec_type = AVRtpPayloadTypes[i].codec_type;
00085                 codec->codec_id = AVRtpPayloadTypes[i].codec_id;
00086                 if (AVRtpPayloadTypes[i].audio_channels > 0)
00087                     codec->channels = AVRtpPayloadTypes[i].audio_channels;
00088                 if (AVRtpPayloadTypes[i].clock_rate > 0)
00089                     codec->sample_rate = AVRtpPayloadTypes[i].clock_rate;
00090                 return 0;
00091             }
00092         }
00093     return -1;
00094 }
00095 
00096 int ff_rtp_get_payload_type(AVCodecContext *codec)
00097 {
00098     int i, payload_type;
00099 
00100     /* compute the payload type */
00101     for (payload_type = -1, i = 0; AVRtpPayloadTypes[i].pt >= 0; ++i)
00102         if (AVRtpPayloadTypes[i].codec_id == codec->codec_id) {
00103             if (codec->codec_id == CODEC_ID_PCM_S16BE)
00104                 if (codec->channels != AVRtpPayloadTypes[i].audio_channels)
00105                     continue;
00106             payload_type = AVRtpPayloadTypes[i].pt;
00107         }
00108     return payload_type;
00109 }
00110 
00111 const char *ff_rtp_enc_name(int payload_type)
00112 {
00113     int i;
00114 
00115     for (i = 0; AVRtpPayloadTypes[i].pt >= 0; i++)
00116         if (AVRtpPayloadTypes[i].pt == payload_type) {
00117             return AVRtpPayloadTypes[i].enc_name;
00118         }
00119 
00120     return "";
00121 }
00122 
00123 enum CodecID ff_rtp_codec_id(const char *buf, enum CodecType codec_type)
00124 {
00125     int i;
00126 
00127     for (i = 0; AVRtpPayloadTypes[i].pt >= 0; i++)
00128         if (!strcmp(buf, AVRtpPayloadTypes[i].enc_name) && (codec_type == AVRtpPayloadTypes[i].codec_type)){
00129             return AVRtpPayloadTypes[i].codec_id;
00130         }
00131 
00132     return CODEC_ID_NONE;
00133 }

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