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in rtpdec.c, so that they can be shared and used in the same way in rtsp.c.
The handlers, since they are specific for RDT, are registered in rdt.c and
a new registration function is thus called from allformats.c.
The dynamic payload handler also implements RDT-specific SDP-line parsing for
OpaqueData and StartTime, which are specific for RDT and needed for proper
playback. OpaqueData contains one or a list ("MLTI") of "MDPR" chunks that
can be parsed by the rmdec.c function ff_rm_read_mdpr_codecdata(). To use
this function, we create a new rdt_demuxer, which has the same private data
as the rm_demuxer. The resulting AVFormatContext created with _open_stream()
can thus be used to call functions in the RM demuxer.
See discussion in "Realmedia patch" thread on ML.
Originally committed as revision 15234 to svn://svn.ffmpeg.org/ffmpeg/trunk
113 lines
4.3 KiB
C
113 lines
4.3 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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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 */
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