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ffmpeg / libavformat / rm.h @ ff13ba92

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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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typedef struct {
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    int nb_packets;
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    int packet_total_size;
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    int packet_max_size;
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    /* codec related output */
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    int bit_rate;
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    float frame_rate;
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    int nb_frames;    /* current frame number */
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    int total_frames; /* total number of frames */
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    int num;
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    AVCodecContext *enc;
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} StreamInfo;
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typedef struct {
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    StreamInfo streams[2];
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    StreamInfo *audio_stream, *video_stream;
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    int data_pos; /* position of the data after the header */
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    int nb_packets;
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    int old_format;
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    int current_stream;
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    int remaining_len;
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    uint8_t *videobuf; ///< place to store merged video frame
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    int videobufsize;  ///< current assembled frame size
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    int videobufpos;   ///< position for the next slice in the video buffer
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    int curpic_num;    ///< picture number of current frame
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    int cur_slice, slices;
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    int64_t pktpos;    ///< first slice position in file
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    /// Audio descrambling matrix parameters
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    uint8_t *audiobuf; ///< place to store reordered audio data
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    int64_t audiotimestamp; ///< Audio packet timestamp
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    int sub_packet_cnt; // Subpacket counter, used while reading
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    int sub_packet_size, sub_packet_h, coded_framesize; ///< Descrambling parameters from container
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    int audio_stream_num; ///< Stream number for audio packets
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    int audio_pkt_cnt; ///< Output packet counter
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    int audio_framesize; /// Audio frame size from container
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    int sub_packet_lengths[16]; /// Length of each aac subpacket
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} RMContext;
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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 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 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, AVStream *st, 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 st stream to which the packet to be read belongs
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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 pointer to an integer containing the packet flags, may be
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                updated
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 * @param ts pointer to timestamp, may be updated
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 * @return 0 on success, errno codes on error
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 */
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int ff_rm_parse_packet (AVFormatContext *s, AVStream *st, 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 st stream that this packet belongs to
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 * @param pkt location to store the packet data
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 */
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void ff_rm_retrieve_cache (AVFormatContext *s, AVStream *st, AVPacket *pkt);
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#endif /* AVFORMAT_RM_H */