aac5773f
 hucm
功能基本完成，接口待打磨
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/*
* "Real" compatible muxer and demuxer.
* Copyright (c) 2000, 2001 Fabrice Bellard
*
* 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
*/
#ifndef AVFORMAT_RM_H
#define AVFORMAT_RM_H
#include "avformat.h"
#include "internal.h"
extern const char * const ff_rm_metadata[4];
extern const AVCodecTag ff_rm_codec_tags[];
typedef struct RMStream RMStream;
RMStream *ff_rm_alloc_rmstream (void);
void ff_rm_free_rmstream (RMStream *rms);
/*< input format for Realmedia-style RTSP streams */
extern AVInputFormat ff_rdt_demuxer;
/**
* Read the MDPR chunk, which contains stream-specific codec initialization
* parameters.
*
* @param s context containing RMContext and AVIOContext for stream reading
* @param pb context to read the data from
* @param st the stream that the MDPR chunk belongs to and where to store the
* parameters read from the chunk into
* @param rst real-specific stream information
* @param codec_data_size size of the MDPR chunk
* @return 0 on success, errno codes on error
*/
int ff_rm_read_mdpr_codecdata (AVFormatContext *s, AVIOContext *pb,
AVStream *st, RMStream *rst,
unsigned int codec_data_size, const uint8_t *mime);
/**
* Parse one rm-stream packet from the input bytestream.
*
* @param s context containing RMContext and AVIOContext for stream reading
* @param pb context to read the data from
* @param st stream to which the packet to be read belongs
* @param rst Real-specific stream information
* @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 the packet flags
* @param ts timestamp of the current packet
* @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
* data is available by calling ff_rm_retrieve_cache().
*/
int ff_rm_parse_packet (AVFormatContext *s, AVIOContext *pb,
AVStream *st, RMStream *rst, int len,
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 AVIOContext for stream reading
* @param pb context to read the data from
* @param st stream that this packet belongs to
* @param rst Real-specific stream information
* @param pkt location to store the packet data
* @return the number of samples left for subsequent calls to this same
* function, or 0 if all samples have been retrieved.
*/
int ff_rm_retrieve_cache (AVFormatContext *s, AVIOContext *pb,
AVStream *st, RMStream *rst, AVPacket *pkt);
#endif /* AVFORMAT_RM_H */
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