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151 lines
6.2 KiB
151 lines
6.2 KiB
/* |
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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 Libav. |
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* |
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* Libav 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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* Libav 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 Libav; 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/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(AVCodecParameters *par, 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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par->codec_type = rtp_payload_types[i].codec_type; |
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par->codec_id = rtp_payload_types[i].codec_id; |
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if (rtp_payload_types[i].audio_channels > 0) |
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par->channels = rtp_payload_types[i].audio_channels; |
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if (rtp_payload_types[i].clock_rate > 0) |
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par->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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AVCodecParameters *par, 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 == par->codec_id) { |
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if (par->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 (par->codec_id == AV_CODEC_ID_ADPCM_G722 && |
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par->sample_rate == 16000 && par->channels == 1) |
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return rtp_payload_types[i].pt; |
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if (par->codec_type == AVMEDIA_TYPE_AUDIO && |
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((rtp_payload_types[i].clock_rate > 0 && |
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par->sample_rate != rtp_payload_types[i].clock_rate) || |
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(rtp_payload_types[i].audio_channels > 0 && |
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par->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 = par->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 (!strcmp(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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