libavformat/rm.h

   1 /*
   2  * "Real" compatible muxer and demuxer.
   3  * Copyright (c) 2000, 2001 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
  22 #ifndef AVFORMAT_RM_H
  23 #define AVFORMAT_RM_H
  24
  25 #include "avformat.h"
  26
  27 typedef struct RMStream RMStream;
  28
  29 RMStream *ff_rm_alloc_rmstream (void);
  30 void      ff_rm_free_rmstream  (RMStream *rms);
  31
  32 /*< input format for Realmedia-style RTSP streams */
  33 extern AVInputFormat rdt_demuxer;
  34
  35 /**
  36  * Read the MDPR chunk, which contains stream-specific codec initialization
  37  * parameters.
  38  *
  39  * @param s context containing RMContext and ByteIOContext for stream reading
  40  * @param pb context to read the data from
  41  * @param st the stream that the MDPR chunk belongs to and where to store the
  42  *           parameters read from the chunk into
  43  * @param rst real-specific stream information
  44  * @param codec_data_size size of the MDPR chunk
  45  * @return 0 on success, errno codes on error
  46  */
  47 int ff_rm_read_mdpr_codecdata (AVFormatContext *s, ByteIOContext *pb,
  48                                AVStream *st, RMStream *rst,
  49                                int codec_data_size);
  50
  51 /**
  52  * Parse one rm-stream packet from the input bytestream.
  53  *
  54  * @param s context containing RMContext and ByteIOContext for stream reading
  55  * @param pb context to read the data from
  56  * @param st stream to which the packet to be read belongs
  57  * @param rst Real-specific stream information
  58  * @param len packet length to read from the input
  59  * @param pkt packet location to store the parsed packet data
  60  * @param seq pointer to an integer containing the sequence number, may be
  61  *            updated
  62  * @param flags pointer to an integer containing the packet flags, may be
  63                 updated
  64  * @param ts pointer to timestamp, may be updated
  65  * @return >=0 on success (where >0 indicates there are cached samples that
  66  *         can be retrieved with subsequent calls to ff_rm_retrieve_cache()),
  67  *         errno codes on error
  68  */
  69 int ff_rm_parse_packet (AVFormatContext *s, ByteIOContext *pb,
  70                         AVStream *st, RMStream *rst, int len,
  71                         AVPacket *pkt, int *seq, int *flags, int64_t *ts);
  72
  73 /**
  74  * Retrieve one cached packet from the rm-context. The real container can
  75  * store several packets (as interpreted by the codec) in a single container
  76  * packet, which means the demuxer holds some back when the first container
  77  * packet is parsed and returned. The result is that rm->audio_pkt_cnt is
  78  * a positive number, the amount of cached packets. Using this function, each
  79  * of those packets can be retrieved sequentially.
  80  *
  81  * @param s context containing RMContext and ByteIOContext for stream reading
  82  * @param pb context to read the data from
  83  * @param st stream that this packet belongs to
  84  * @param rst Real-specific stream information
  85  * @param pkt location to store the packet data
  86  * @returns the number of samples left for subsequent calls to this same
  87  *          function, or 0 if all samples have been retrieved.
  88  */
  89 int ff_rm_retrieve_cache (AVFormatContext *s, ByteIOContext *pb,
  90                           AVStream *st, RMStream *rst, AVPacket *pkt);
  91
  92 #endif /* AVFORMAT_RM_H */