yading@11: /*
yading@11:  * RTP definitions
yading@11:  * Copyright (c) 2002 Fabrice Bellard
yading@11:  *
yading@11:  * This file is part of FFmpeg.
yading@11:  *
yading@11:  * FFmpeg is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public
yading@11:  * License as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * FFmpeg is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@11:  * Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public
yading@11:  * License along with FFmpeg; if not, write to the Free Software
yading@11:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: #ifndef AVFORMAT_RTP_H
yading@11: #define AVFORMAT_RTP_H
yading@11: 
yading@11: #include "libavformat/avformat.h"
yading@11: #include "libavcodec/avcodec.h"
yading@11: 
yading@11: /**
yading@11:  * Return the payload type for a given stream used in the given format context.
yading@11:  * Static payload types are derived from the codec.
yading@11:  * Dynamic payload type are derived from the id field in AVStream.
yading@11:  * The format context private option payload_type overrides both.
yading@11:  *
yading@11:  * @param fmt   The context of the format
yading@11:  * @param codec The context of the codec
yading@11:  * @param idx   The stream index
yading@11:  * @return The payload type (the 'PT' field in the RTP header).
yading@11:  */
yading@11: int ff_rtp_get_payload_type(AVFormatContext *fmt, AVCodecContext *codec,
yading@11:                             int idx);
yading@11: 
yading@11: /**
yading@11:  * Initialize a codec context based on the payload type.
yading@11:  *
yading@11:  * Fill the codec_type and codec_id fields of a codec context with
yading@11:  * information depending on the payload type; for audio codecs, the
yading@11:  * channels and sample_rate fields are also filled.
yading@11:  *
yading@11:  * @param codec The context of the codec
yading@11:  * @param payload_type The payload type (the 'PT' field in the RTP header)
yading@11:  * @return In case of unknown payload type or dynamic payload type, a
yading@11:  * negative value is returned; otherwise, 0 is returned
yading@11:  */
yading@11: int ff_rtp_get_codec_info(AVCodecContext *codec, int payload_type);
yading@11: 
yading@11: /**
yading@11:  * Return the encoding name (as defined in
yading@11:  * http://www.iana.org/assignments/rtp-parameters) for a given payload type.
yading@11:  *
yading@11:  * @param payload_type The payload type (the 'PT' field in the RTP header)
yading@11:  * @return In case of unknown payload type or dynamic payload type, a pointer
yading@11:  * to an empty string is returned; otherwise, a pointer to a string containing
yading@11:  * the encoding name is returned
yading@11:  */
yading@11: const char *ff_rtp_enc_name(int payload_type);
yading@11: 
yading@11: /**
yading@11:  * Return the codec id for the given encoding name and codec type.
yading@11:  *
yading@11:  * @param buf A pointer to the string containing the encoding name
yading@11:  * @param codec_type The codec type
yading@11:  * @return In case of unknown encoding name, AV_CODEC_ID_NONE is returned;
yading@11:  * otherwise, the codec id is returned
yading@11:  */
yading@11: enum AVCodecID ff_rtp_codec_id(const char *buf, enum AVMediaType codec_type);
yading@11: 
yading@11: #define RTP_PT_PRIVATE 96
yading@11: #define RTP_VERSION 2
yading@11: #define RTP_MAX_SDES 256   /**< maximum text length for SDES */
yading@11: 
yading@11: /* RTCP packets use 0.5% of the bandwidth */
yading@11: #define RTCP_TX_RATIO_NUM 5
yading@11: #define RTCP_TX_RATIO_DEN 1000
yading@11: 
yading@11: /* An arbitrary id value for RTP Xiph streams - only relevant to indicate
yading@11:  * that the configuration has changed within a stream (by changing the
yading@11:  * ident value sent).
yading@11:  */
yading@11: #define RTP_XIPH_IDENT 0xfecdba
yading@11: 
yading@11: /* RTCP packet types */
yading@11: enum RTCPType {
yading@11:     RTCP_FIR    = 192,
yading@11:     RTCP_NACK, // 193
yading@11:     RTCP_SMPTETC,// 194
yading@11:     RTCP_IJ,   // 195
yading@11:     RTCP_SR     = 200,
yading@11:     RTCP_RR,   // 201
yading@11:     RTCP_SDES, // 202
yading@11:     RTCP_BYE,  // 203
yading@11:     RTCP_APP,  // 204
yading@11:     RTCP_RTPFB,// 205
yading@11:     RTCP_PSFB, // 206
yading@11:     RTCP_XR,   // 207
yading@11:     RTCP_AVB,  // 208
yading@11:     RTCP_RSI,  // 209
yading@11:     RTCP_TOKEN,// 210
yading@11: };
yading@11: 
yading@11: #define RTP_PT_IS_RTCP(x) (((x) >= RTCP_FIR && (x) <= RTCP_IJ) || \
yading@11:                            ((x) >= RTCP_SR  && (x) <= RTCP_TOKEN))
yading@11: 
yading@11: #endif /* AVFORMAT_RTP_H */