libavformat/rtp.h

   1 /*
   2  * RTP definitions
   3  * Copyright (c) 2002 Fabrice Bellard
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21 #ifndef AVFORMAT_RTP_H
  22 #define AVFORMAT_RTP_H
  23
  24 #include "libavcodec/avcodec.h"
  25
  26 /**
  27  * Return the payload type for a given codec.
  28  *
  29  * @param codec The context of the codec
  30  * @return In case of unknown payload type or dynamic payload type, a
  31  * negative value is returned; otherwise, the payload type (the 'PT' field
  32  * in the RTP header) is returned.
  33  */
  34 int ff_rtp_get_payload_type(AVCodecContext *codec);
  35
  36 /**
  37  * Initialize a codec context based on the payload type.
  38  *
  39  * Fill the codec_type and codec_id fields of a codec context with
  40  * information depending on the payload type; for audio codecs, the
  41  * channels and sample_rate fields are also filled.
  42  *
  43  * @param codec The context of the codec
  44  * @param payload_type The payload type (the 'PT' field in the RTP header)
  45  * @return In case of unknown payload type or dynamic payload type, a
  46  * negative value is returned; otherwise, 0 is returned
  47  */
  48 int ff_rtp_get_codec_info(AVCodecContext *codec, int payload_type);
  49
  50 /**
  51  * Return the encoding name (as defined in
  52  * http://www.iana.org/assignments/rtp-parameters) for a given payload type.
  53  *
  54  * @param payload_type The payload type (the 'PT' field in the RTP header)
  55  * @return In case of unknown payload type or dynamic payload type, a pointer
  56  * to an empty string is returned; otherwise, a pointer to a string containing
  57  * the encoding name is returned
  58  */
  59 const char *ff_rtp_enc_name(int payload_type);
  60
  61 /**
  62  * Return the codec id for the given encoding name and codec type.
  63  *
  64  * @param buf A pointer to the string containing the encoding name
  65  * @param codec_type The codec type
  66  * @return In case of unknown encoding name, CODEC_ID_NONE is returned;
  67  * otherwise, the codec id is returned
  68  */
  69 enum CodecID ff_rtp_codec_id(const char *buf, enum CodecType codec_type);
  70
  71 #define RTP_PT_PRIVATE 96
  72 #define RTP_VERSION 2
  73 #define RTP_MAX_SDES 256   /**< maximum text length for SDES */
  74
  75 /* RTCP paquets use 0.5 % of the bandwidth */
  76 #define RTCP_TX_RATIO_NUM 5
  77 #define RTCP_TX_RATIO_DEN 1000
  78
  79 #endif /* AVFORMAT_RTP_H */