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115 lines
3.9 KiB
115 lines
3.9 KiB
/* |
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* RTP definitions |
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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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#ifndef AVFORMAT_RTP_H |
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#define AVFORMAT_RTP_H |
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#include "libavformat/avformat.h" |
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#include "libavcodec/avcodec.h" |
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#include "libavutil/mathematics.h" |
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/** |
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* Return the payload type for a given stream used in the given format context. |
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* Static payload types are derived from the codec. |
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* Dynamic payload type are derived from the id field in AVStream. |
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* The format context private option payload_type overrides both. |
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* |
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* @param fmt The context of the format |
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* @param codec The context of the codec |
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* @param idx The stream index |
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* @return The payload type (the 'PT' field in the RTP header). |
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*/ |
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int ff_rtp_get_payload_type(AVFormatContext *fmt, AVCodecContext *codec, |
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int idx); |
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/** |
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* Initialize a codec context based on the payload type. |
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* |
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* Fill the codec_type and codec_id fields of a codec context with |
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* information depending on the payload type; for audio codecs, the |
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* channels and sample_rate fields are also filled. |
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* |
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* @param codec The context of the codec |
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* @param payload_type The payload type (the 'PT' field in the RTP header) |
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* @return In case of unknown payload type or dynamic payload type, a |
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* negative value is returned; otherwise, 0 is returned |
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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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* Return the encoding name (as defined in |
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* http://www.iana.org/assignments/rtp-parameters) for a given payload type. |
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* |
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* @param payload_type The payload type (the 'PT' field in the RTP header) |
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* @return In case of unknown payload type or dynamic payload type, a pointer |
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* to an empty string is returned; otherwise, a pointer to a string containing |
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* the encoding name is returned |
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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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* Return the codec id for the given encoding name and codec type. |
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* |
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* @param buf A pointer to the string containing the encoding name |
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* @param codec_type The codec type |
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* @return In case of unknown encoding name, AV_CODEC_ID_NONE is returned; |
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* otherwise, the codec id is returned |
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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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#define RTP_PT_PRIVATE 96 |
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#define RTP_VERSION 2 |
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#define RTP_MAX_SDES 256 /**< maximum text length for SDES */ |
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/* RTCP packets use 0.5% of the bandwidth */ |
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#define RTCP_TX_RATIO_NUM 5 |
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#define RTCP_TX_RATIO_DEN 1000 |
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/* An arbitrary id value for RTP Xiph streams - only relevant to indicate |
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* that the configuration has changed within a stream (by changing the |
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* ident value sent). |
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*/ |
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#define RTP_XIPH_IDENT 0xfecdba |
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/* RTCP packet types */ |
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enum RTCPType { |
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RTCP_FIR = 192, |
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RTCP_NACK, // 193 |
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RTCP_SMPTETC,// 194 |
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RTCP_IJ, // 195 |
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RTCP_SR = 200, |
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RTCP_RR, // 201 |
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RTCP_SDES, // 202 |
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RTCP_BYE, // 203 |
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RTCP_APP, // 204 |
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RTCP_RTPFB,// 205 |
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RTCP_PSFB, // 206 |
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RTCP_XR, // 207 |
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RTCP_AVB, // 208 |
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RTCP_RSI, // 209 |
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RTCP_TOKEN,// 210 |
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}; |
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#define RTP_PT_IS_RTCP(x) (((x) >= RTCP_FIR && (x) <= RTCP_IJ) || \ |
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((x) >= RTCP_SR && (x) <= RTCP_TOKEN)) |
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#define NTP_TO_RTP_FORMAT(x) av_rescale((x), INT64_C(1) << 32, 1000000) |
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#endif /* AVFORMAT_RTP_H */
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