mirror of https://git.videolan.org/git/ffmpeg.git
353 lines
12 KiB
C
353 lines
12 KiB
C
/*
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* copyright (c) 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_DEMUX_H
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#define AVFORMAT_DEMUX_H
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#include <stdint.h>
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#include "libavutil/rational.h"
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#include "libavcodec/packet.h"
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#include "avformat.h"
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struct AVDeviceInfoList;
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/**
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* For an FFInputFormat with this flag set read_close() needs to be called
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* by the caller upon read_header() failure.
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*/
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#define FF_INFMT_FLAG_INIT_CLEANUP (1 << 0)
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typedef struct FFInputFormat {
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/**
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* The public AVInputFormat. See avformat.h for it.
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*/
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AVInputFormat p;
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/**
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* Raw demuxers store their codec ID here.
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*/
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enum AVCodecID raw_codec_id;
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/**
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* Size of private data so that it can be allocated in the wrapper.
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*/
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int priv_data_size;
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/**
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* Internal flags. See FF_INFMT_FLAG_* above and FF_FMT_FLAG_* in internal.h.
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*/
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int flags_internal;
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/**
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* Tell if a given file has a chance of being parsed as this format.
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* The buffer provided is guaranteed to be AVPROBE_PADDING_SIZE bytes
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* big so you do not have to check for that unless you need more.
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*/
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int (*read_probe)(const AVProbeData *);
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/**
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* Read the format header and initialize the AVFormatContext
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* structure. Return 0 if OK. 'avformat_new_stream' should be
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* called to create new streams.
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*/
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int (*read_header)(struct AVFormatContext *);
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/**
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* Read one packet and put it in 'pkt'. pts and flags are also
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* set. 'avformat_new_stream' can be called only if the flag
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* AVFMTCTX_NOHEADER is used and only in the calling thread (not in a
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* background thread).
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* @return 0 on success, < 0 on error.
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* Upon returning an error, pkt must be unreferenced by the caller.
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*/
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int (*read_packet)(struct AVFormatContext *, AVPacket *pkt);
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/**
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* Close the stream. The AVFormatContext and AVStreams are not
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* freed by this function
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*/
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int (*read_close)(struct AVFormatContext *);
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/**
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* Seek to a given timestamp relative to the frames in
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* stream component stream_index.
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* @param stream_index Must not be -1.
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* @param flags Selects which direction should be preferred if no exact
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* match is available.
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* @return >= 0 on success (but not necessarily the new offset)
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*/
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int (*read_seek)(struct AVFormatContext *,
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int stream_index, int64_t timestamp, int flags);
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/**
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* Get the next timestamp in stream[stream_index].time_base units.
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* @return the timestamp or AV_NOPTS_VALUE if an error occurred
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*/
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int64_t (*read_timestamp)(struct AVFormatContext *s, int stream_index,
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int64_t *pos, int64_t pos_limit);
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/**
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* Start/resume playing - only meaningful if using a network-based format
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* (RTSP).
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*/
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int (*read_play)(struct AVFormatContext *);
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/**
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* Pause playing - only meaningful if using a network-based format
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* (RTSP).
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*/
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int (*read_pause)(struct AVFormatContext *);
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/**
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* Seek to timestamp ts.
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* Seeking will be done so that the point from which all active streams
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* can be presented successfully will be closest to ts and within min/max_ts.
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* Active streams are all streams that have AVStream.discard < AVDISCARD_ALL.
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*/
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int (*read_seek2)(struct AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags);
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/**
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* Returns device list with it properties.
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* @see avdevice_list_devices() for more details.
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*/
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int (*get_device_list)(struct AVFormatContext *s, struct AVDeviceInfoList *device_list);
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} FFInputFormat;
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static inline const FFInputFormat *ffifmt(const AVInputFormat *fmt)
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{
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return (const FFInputFormat*)fmt;
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}
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#define MAX_STD_TIMEBASES (30*12+30+3+6)
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typedef struct FFStreamInfo {
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int64_t last_dts;
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int64_t duration_gcd;
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int duration_count;
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int64_t rfps_duration_sum;
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double (*duration_error)[2][MAX_STD_TIMEBASES];
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int64_t codec_info_duration;
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int64_t codec_info_duration_fields;
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int frame_delay_evidence;
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/**
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* 0 -> decoder has not been searched for yet.
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* >0 -> decoder found
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* <0 -> decoder with codec_id == -found_decoder has not been found
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*/
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int found_decoder;
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int64_t last_duration;
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/**
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* Those are used for average framerate estimation.
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*/
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int64_t fps_first_dts;
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int fps_first_dts_idx;
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int64_t fps_last_dts;
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int fps_last_dts_idx;
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} FFStreamInfo;
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/**
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* Returned by demuxers to indicate that data was consumed but discarded
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* (ignored streams or junk data). The framework will re-call the demuxer.
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*/
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#define FFERROR_REDO FFERRTAG('R','E','D','O')
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#define RELATIVE_TS_BASE (INT64_MAX - (1LL << 48))
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static av_always_inline int is_relative(int64_t ts)
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{
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return ts > (RELATIVE_TS_BASE - (1LL << 48));
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}
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/**
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* Wrap a given time stamp, if there is an indication for an overflow
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*
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* @param st stream
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* @param timestamp the time stamp to wrap
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* @return resulting time stamp
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*/
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int64_t ff_wrap_timestamp(const AVStream *st, int64_t timestamp);
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/**
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* Read a transport packet from a media file.
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*
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* @param s media file handle
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* @param pkt is filled
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* @return 0 if OK, AVERROR_xxx on error
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*/
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int ff_read_packet(AVFormatContext *s, AVPacket *pkt);
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void ff_read_frame_flush(AVFormatContext *s);
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/**
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* Perform a binary search using av_index_search_timestamp() and
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* FFInputFormat.read_timestamp().
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*
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* @param target_ts target timestamp in the time base of the given stream
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* @param stream_index stream number
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*/
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int ff_seek_frame_binary(AVFormatContext *s, int stream_index,
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int64_t target_ts, int flags);
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/**
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* Update cur_dts of all streams based on the given timestamp and AVStream.
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*
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* Stream ref_st unchanged, others set cur_dts in their native time base.
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* Only needed for timestamp wrapping or if (dts not set and pts!=dts).
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* @param timestamp new dts expressed in time_base of param ref_st
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* @param ref_st reference stream giving time_base of param timestamp
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*/
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void avpriv_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp);
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int ff_find_last_ts(AVFormatContext *s, int stream_index, int64_t *ts, int64_t *pos,
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int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t ));
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/**
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* Perform a binary search using read_timestamp().
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*
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* @param target_ts target timestamp in the time base of the given stream
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* @param stream_index stream number
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*/
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int64_t ff_gen_search(AVFormatContext *s, int stream_index,
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int64_t target_ts, int64_t pos_min,
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int64_t pos_max, int64_t pos_limit,
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int64_t ts_min, int64_t ts_max,
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int flags, int64_t *ts_ret,
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int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t ));
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/**
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* Internal version of av_index_search_timestamp
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*/
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int ff_index_search_timestamp(const AVIndexEntry *entries, int nb_entries,
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int64_t wanted_timestamp, int flags);
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/**
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* Internal version of av_add_index_entry
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*/
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int ff_add_index_entry(AVIndexEntry **index_entries,
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int *nb_index_entries,
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unsigned int *index_entries_allocated_size,
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int64_t pos, int64_t timestamp, int size, int distance, int flags);
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void ff_configure_buffers_for_index(AVFormatContext *s, int64_t time_tolerance);
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/**
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* Ensure the index uses less memory than the maximum specified in
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* AVFormatContext.max_index_size by discarding entries if it grows
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* too large.
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*/
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void ff_reduce_index(AVFormatContext *s, int stream_index);
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/**
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* add frame for rfps calculation.
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*
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* @param dts timestamp of the i-th frame
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* @return 0 if OK, AVERROR_xxx on error
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*/
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int ff_rfps_add_frame(AVFormatContext *ic, AVStream *st, int64_t dts);
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void ff_rfps_calculate(AVFormatContext *ic);
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/**
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* Rescales a timestamp and the endpoints of an interval to which the temstamp
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* belongs, from a timebase `tb_in` to a timebase `tb_out`.
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*
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* The upper (lower) bound of the output interval is rounded up (down) such that
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* the output interval always falls within the intput interval. The timestamp is
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* rounded to the nearest integer and halfway cases away from zero, and can
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* therefore fall outside of the output interval.
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*
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* Useful to simplify the rescaling of the arguments of FFInputFormat::read_seek2()
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*
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* @param[in] tb_in Timebase of the input `min_ts`, `ts` and `max_ts`
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* @param[in] tb_out Timebase of the output `min_ts`, `ts` and `max_ts`
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* @param[in,out] min_ts Lower bound of the interval
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* @param[in,out] ts Timestamp
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* @param[in,out] max_ts Upper bound of the interval
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*/
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void ff_rescale_interval(AVRational tb_in, AVRational tb_out,
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int64_t *min_ts, int64_t *ts, int64_t *max_ts);
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void avpriv_stream_set_need_parsing(AVStream *st, enum AVStreamParseType type);
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/**
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* Add a new chapter.
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*
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* @param s media file handle
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* @param id unique ID for this chapter
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* @param start chapter start time in time_base units
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* @param end chapter end time in time_base units
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* @param title chapter title
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*
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* @return AVChapter or NULL on error
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*/
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AVChapter *avpriv_new_chapter(AVFormatContext *s, int64_t id, AVRational time_base,
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int64_t start, int64_t end, const char *title);
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/**
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* Add an attached pic to an AVStream.
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*
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* @param st if set, the stream to add the attached pic to;
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* if unset, a new stream will be added to s.
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* @param pb AVIOContext to read data from if buf is unset.
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* @param buf if set, it contains the data and size information to be used
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* for the attached pic; if unset, data is read from pb.
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* @param size the size of the data to read if buf is unset.
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*
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* @return 0 on success, < 0 on error. On error, this function removes
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* the stream it has added (if any).
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*/
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int ff_add_attached_pic(AVFormatContext *s, AVStream *st, AVIOContext *pb,
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AVBufferRef **buf, int size);
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/**
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* Add side data to a packet for changing parameters to the given values.
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* Parameters set to 0 aren't included in the change.
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*/
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int ff_add_param_change(AVPacket *pkt, int32_t channels,
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uint64_t channel_layout, int32_t sample_rate,
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int32_t width, int32_t height);
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/**
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* Generate standard extradata for AVC-Intra based on width/height and field
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* order.
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*/
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int ff_generate_avci_extradata(AVStream *st);
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/**
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* Allocate extradata with additional AV_INPUT_BUFFER_PADDING_SIZE at end
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* which is always set to 0 and fill it from pb.
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*
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* @param size size of extradata
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* @return >= 0 if OK, AVERROR_xxx on error
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*/
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int ff_get_extradata(void *logctx, AVCodecParameters *par, AVIOContext *pb, int size);
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/**
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* Find stream index based on format-specific stream ID
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* @return stream index, or < 0 on error
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*/
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int ff_find_stream_index(const AVFormatContext *s, int id);
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int ff_buffer_packet(AVFormatContext *s, AVPacket *pkt);
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#endif /* AVFORMAT_DEMUX_H */
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