rm.h 3.82 KB
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/*
 * "Real" compatible muxer and demuxer.
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 * Copyright (c) 2000, 2001 Fabrice Bellard
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 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

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#ifndef AVFORMAT_RM_H
#define AVFORMAT_RM_H
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#include "avformat.h"

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extern const char *ff_rm_metadata[4];

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typedef struct RMStream RMStream;

RMStream *ff_rm_alloc_rmstream (void);
void      ff_rm_free_rmstream  (RMStream *rms);

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/*< input format for Realmedia-style RTSP streams */
extern AVInputFormat rdt_demuxer;

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/**
 * Read the MDPR chunk, which contains stream-specific codec initialization
 * parameters.
 *
 * @param s context containing RMContext and ByteIOContext for stream reading
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 * @param pb context to read the data from
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 * @param st the stream that the MDPR chunk belongs to and where to store the
 *           parameters read from the chunk into
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 * @param rst real-specific stream information
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 * @param codec_data_size size of the MDPR chunk
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 * @return 0 on success, errno codes on error
 */
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int ff_rm_read_mdpr_codecdata (AVFormatContext *s, ByteIOContext *pb,
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                               AVStream *st, RMStream *rst,
                               int codec_data_size);
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/**
 * Parse one rm-stream packet from the input bytestream.
 *
 * @param s context containing RMContext and ByteIOContext for stream reading
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 * @param pb context to read the data from
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 * @param st stream to which the packet to be read belongs
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 * @param rst Real-specific stream information
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 * @param len packet length to read from the input
 * @param pkt packet location to store the parsed packet data
 * @param seq pointer to an integer containing the sequence number, may be
 *            updated
 * @param flags pointer to an integer containing the packet flags, may be
                updated
 * @param ts pointer to timestamp, may be updated
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 * @return <0 on error, 0 if a packet was placed in the pkt pointer. A
 *         value >0 means that no data was placed in pkt, but that cached
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 *         data is available by calling ff_rm_retrieve_cache().
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 */
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int ff_rm_parse_packet (AVFormatContext *s, ByteIOContext *pb,
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                        AVStream *st, RMStream *rst, int len,
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                        AVPacket *pkt, int *seq, int *flags, int64_t *ts);

/**
 * Retrieve one cached packet from the rm-context. The real container can
 * store several packets (as interpreted by the codec) in a single container
 * packet, which means the demuxer holds some back when the first container
 * packet is parsed and returned. The result is that rm->audio_pkt_cnt is
 * a positive number, the amount of cached packets. Using this function, each
 * of those packets can be retrieved sequentially.
 *
 * @param s context containing RMContext and ByteIOContext for stream reading
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 * @param pb context to read the data from
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 * @param st stream that this packet belongs to
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 * @param rst Real-specific stream information
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 * @param pkt location to store the packet data
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 * @returns the number of samples left for subsequent calls to this same
 *          function, or 0 if all samples have been retrieved.
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 */
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int ff_rm_retrieve_cache (AVFormatContext *s, ByteIOContext *pb,
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                          AVStream *st, RMStream *rst, AVPacket *pkt);
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#endif /* AVFORMAT_RM_H */