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ffmpeg / libavformat / rm.h @ 74e8ccad

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/*
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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 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 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
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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, ByteIOContext *pb,
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                               AVStream *st, RMStream *rst,
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                               int codec_data_size);
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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 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
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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, 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);
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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 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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 * @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, ByteIOContext *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 */