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104 lines
4.0 KiB
C
104 lines
4.0 KiB
C
/*
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* "Real" compatible muxer and demuxer.
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* Copyright (c) 2000, 2001 Fabrice Bellard
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVFORMAT_RM_H
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#define AVFORMAT_RM_H
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#include "avformat.h"
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#include "internal.h"
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extern const char * const ff_rm_metadata[4];
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extern const unsigned char ff_sipr_subpk_size[4];
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extern const AVCodecTag ff_rm_codec_tags[];
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typedef struct RMStream RMStream;
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RMStream *ff_rm_alloc_rmstream (void);
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void ff_rm_free_rmstream (RMStream *rms);
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/*< input format for Realmedia-style RTSP streams */
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extern AVInputFormat ff_rdt_demuxer;
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/**
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* Read the MDPR chunk, which contains stream-specific codec initialization
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* parameters.
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*
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* @param s context containing RMContext and AVIOContext 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
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* 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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*/
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int ff_rm_read_mdpr_codecdata (AVFormatContext *s, AVIOContext *pb,
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AVStream *st, RMStream *rst,
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int codec_data_size, const uint8_t *mime);
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/**
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* Parse one rm-stream packet from the input bytestream.
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*
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* @param s context containing RMContext and AVIOContext 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
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* @param pkt packet location to store the parsed packet data
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* @param seq pointer to an integer containing the sequence number, may be
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* updated
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* @param flags the packet flags
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* @param ts timestamp of the current packet
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* @return <0 on error, 0 if a packet was placed in the pkt pointer. A
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* 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, AVIOContext *pb,
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AVStream *st, RMStream *rst, int len,
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AVPacket *pkt, int *seq, int flags, int64_t ts);
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/**
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* Retrieve one cached packet from the rm-context. The real container can
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* store several packets (as interpreted by the codec) in a single container
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* packet, which means the demuxer holds some back when the first container
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* packet is parsed and returned. The result is that rm->audio_pkt_cnt is
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* a positive number, the amount of cached packets. Using this function, each
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* of those packets can be retrieved sequentially.
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*
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* @param s context containing RMContext and AVIOContext 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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* @return the number of samples left for subsequent calls to this same
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* function, or 0 if all samples have been retrieved.
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*/
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int ff_rm_retrieve_cache (AVFormatContext *s, AVIOContext *pb,
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AVStream *st, RMStream *rst, AVPacket *pkt);
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/**
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* Perform 4-bit block reordering for SIPR data.
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*
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* @param buf SIPR data
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*/
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void ff_rm_reorder_sipr_data(uint8_t *buf, int sub_packet_h, int framesize);
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#endif /* AVFORMAT_RM_H */
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