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 extern const char *ff_rm_metadata[4];
  28
  29 typedef struct RMStream RMStream;
  30
  31 RMStream *ff_rm_alloc_rmstream (void);
  32 void      ff_rm_free_rmstream  (RMStream *rms);
  33
  34 /*< input format for Realmedia-style RTSP streams */
  35 extern AVInputFormat rdt_demuxer;
  36
  37 /**
  38  * Read the MDPR chunk, which contains stream-specific codec initialization
  39  * parameters.
  40  *
  41  * @param s context containing RMContext and ByteIOContext for stream reading
  42  * @param pb context to read the data from
  43  * @param st the stream that the MDPR chunk belongs to and where to store the
  44  *           parameters read from the chunk into
  45  * @param rst real-specific stream information
  46  * @param codec_data_size size of the MDPR chunk
  47  * @return 0 on success, errno codes on error
  48  */
  49 int ff_rm_read_mdpr_codecdata (AVFormatContext *s, ByteIOContext *pb,
  50                                AVStream *st, RMStream *rst,
  51                                int codec_data_size);
  52
  53 /**
  54  * Parse one rm-stream packet from the input bytestream.
  55  *
  56  * @param s context containing RMContext and ByteIOContext for stream reading
  57  * @param pb context to read the data from
  58  * @param st stream to which the packet to be read belongs
  59  * @param rst Real-specific stream information
  60  * @param len packet length to read from the input
  61  * @param pkt packet location to store the parsed packet data
  62  * @param seq pointer to an integer containing the sequence number, may be
  63  *            updated
  64  * @param flags pointer to an integer containing the packet flags, may be
  65                 updated
  66  * @param ts pointer to timestamp, may be updated
  67  * @return <0 on error, 0 if a packet was placed in the \p pkt pointer. A
  68  *         value >0 means that no data was placed in \p pkt, but that cached
  69  *         data is available by calling ff_rm_retrieve_cache().
  70  */
  71 int ff_rm_parse_packet (AVFormatContext *s, ByteIOContext *pb,
  72                         AVStream *st, RMStream *rst, int len,
  73                         AVPacket *pkt, int *seq, int *flags, int64_t *ts);
  74
  75 /**
  76  * Retrieve one cached packet from the rm-context. The real container can
  77  * store several packets (as interpreted by the codec) in a single container
  78  * packet, which means the demuxer holds some back when the first container
  79  * packet is parsed and returned. The result is that rm->audio_pkt_cnt is
  80  * a positive number, the amount of cached packets. Using this function, each
  81  * of those packets can be retrieved sequentially.
  82  *
  83  * @param s context containing RMContext and ByteIOContext for stream reading
  84  * @param pb context to read the data from
  85  * @param st stream that this packet belongs to
  86  * @param rst Real-specific stream information
  87  * @param pkt location to store the packet data
  88  * @returns the number of samples left for subsequent calls to this same
  89  *          function, or 0 if all samples have been retrieved.
  90  */
  91 int ff_rm_retrieve_cache (AVFormatContext *s, ByteIOContext *pb,
  92                           AVStream *st, RMStream *rst, AVPacket *pkt);
  93
  94 #endif /* AVFORMAT_RM_H */