mirror of
https://github.com/librempeg/librempeg
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153 lines
6.3 KiB
C
153 lines
6.3 KiB
C
/*
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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 "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;
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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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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;
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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},
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{3, "GSM", AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_NONE, 8000, 1},
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{4, "G723", AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_G723_1, 8000, 1},
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{5, "DVI4", AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_NONE, 8000, 1},
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{6, "DVI4", AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_NONE, 16000, 1},
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{7, "LPC", AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_NONE, 8000, 1},
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{8, "PCMA", AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_PCM_ALAW, 8000, 1},
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{9, "G722", AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_ADPCM_G722, 8000, 1},
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{10, "L16", AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_PCM_S16BE, 44100, 2},
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{11, "L16", AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_PCM_S16BE, 44100, 1},
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{12, "QCELP", AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_QCELP, 8000, 1},
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{13, "CN", AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_NONE, 8000, 1},
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{14, "MPA", AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_MP2, -1, -1},
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{14, "MPA", AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_MP3, -1, -1},
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{15, "G728", AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_NONE, 8000, 1},
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{16, "DVI4", AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_NONE, 11025, 1},
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{17, "DVI4", AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_NONE, 22050, 1},
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{18, "G729", AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_NONE, 8000, 1},
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{25, "CelB", AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_NONE, 90000, -1},
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{26, "JPEG", AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MJPEG, 90000, -1},
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{28, "nv", AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_NONE, 90000, -1},
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{31, "H261", AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_H261, 90000, -1},
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{32, "MPV", AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG1VIDEO, 90000, -1},
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{32, "MPV", AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG2VIDEO, 90000, -1},
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{33, "MP2T", AVMEDIA_TYPE_DATA, AV_CODEC_ID_MPEG2TS, 90000, -1},
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{34, "H263", AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_H263, 90000, -1},
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{-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++)
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if (rtp_payload_types[i].pt == payload_type) {
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if (rtp_payload_types[i].codec_id != AV_CODEC_ID_NONE) {
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codec->codec_type = rtp_payload_types[i].codec_type;
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codec->codec_id = rtp_payload_types[i].codec_id;
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if (rtp_payload_types[i].audio_channels > 0)
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codec->channels = rtp_payload_types[i].audio_channels;
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if (rtp_payload_types[i].clock_rate > 0)
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codec->sample_rate = rtp_payload_types[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(AVFormatContext *fmt,
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AVCodecContext *codec, int idx)
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{
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int i;
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AVOutputFormat *ofmt = fmt ? fmt->oformat : NULL;
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/* 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 &&
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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)
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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,
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* 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 &&
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codec->sample_rate != rtp_payload_types[i].clock_rate) ||
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(rtp_payload_types[i].audio_channels > 0 &&
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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)
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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)
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{
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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 (rtp_payload_types[i].pt == payload_type)
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return rtp_payload_types[i].enc_name;
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return "";
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}
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enum AVCodecID 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; 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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}
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