/* * copyright (c) 2001 Fabrice Bellard * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #ifndef AVFORMAT_DEMUX_H #define AVFORMAT_DEMUX_H #include <stdint.h> #include "libavutil/rational.h" #include "libavcodec/packet.h" #include "avformat.h" struct AVDeviceInfoList; /** * For an FFInputFormat with this flag set read_close() needs to be called * by the caller upon read_header() failure. */ #define FF_INFMT_FLAG_INIT_CLEANUP … FFInputFormat; static inline const FFInputFormat *ffifmt(const AVInputFormat *fmt) { … } #define MAX_STD_TIMEBASES … FFStreamInfo; /** * Returned by demuxers to indicate that data was consumed but discarded * (ignored streams or junk data). The framework will re-call the demuxer. */ #define FFERROR_REDO … #define RELATIVE_TS_BASE … static av_always_inline int is_relative(int64_t ts) { … } /** * Wrap a given time stamp, if there is an indication for an overflow * * @param st stream * @param timestamp the time stamp to wrap * @return resulting time stamp */ int64_t ff_wrap_timestamp(const AVStream *st, int64_t timestamp); /** * Read a transport packet from a media file. * * @param s media file handle * @param pkt is filled * @return 0 if OK, AVERROR_xxx on error */ int ff_read_packet(AVFormatContext *s, AVPacket *pkt); void ff_read_frame_flush(AVFormatContext *s); /** * Perform a binary search using av_index_search_timestamp() and * FFInputFormat.read_timestamp(). * * @param target_ts target timestamp in the time base of the given stream * @param stream_index stream number */ int ff_seek_frame_binary(AVFormatContext *s, int stream_index, int64_t target_ts, int flags); /** * Update cur_dts of all streams based on the given timestamp and AVStream. * * Stream ref_st unchanged, others set cur_dts in their native time base. * Only needed for timestamp wrapping or if (dts not set and pts!=dts). * @param timestamp new dts expressed in time_base of param ref_st * @param ref_st reference stream giving time_base of param timestamp */ void avpriv_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp); int ff_find_last_ts(AVFormatContext *s, int stream_index, int64_t *ts, int64_t *pos, int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t )); /** * Perform a binary search using read_timestamp(). * * @param target_ts target timestamp in the time base of the given stream * @param stream_index stream number */ int64_t ff_gen_search(AVFormatContext *s, int stream_index, int64_t target_ts, int64_t pos_min, int64_t pos_max, int64_t pos_limit, int64_t ts_min, int64_t ts_max, int flags, int64_t *ts_ret, int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t )); /** * Internal version of av_index_search_timestamp */ int ff_index_search_timestamp(const AVIndexEntry *entries, int nb_entries, int64_t wanted_timestamp, int flags); /** * Internal version of av_add_index_entry */ int ff_add_index_entry(AVIndexEntry **index_entries, int *nb_index_entries, unsigned int *index_entries_allocated_size, int64_t pos, int64_t timestamp, int size, int distance, int flags); void ff_configure_buffers_for_index(AVFormatContext *s, int64_t time_tolerance); /** * Ensure the index uses less memory than the maximum specified in * AVFormatContext.max_index_size by discarding entries if it grows * too large. */ void ff_reduce_index(AVFormatContext *s, int stream_index); /** * add frame for rfps calculation. * * @param dts timestamp of the i-th frame * @return 0 if OK, AVERROR_xxx on error */ int ff_rfps_add_frame(AVFormatContext *ic, AVStream *st, int64_t dts); void ff_rfps_calculate(AVFormatContext *ic); /** * Rescales a timestamp and the endpoints of an interval to which the temstamp * belongs, from a timebase `tb_in` to a timebase `tb_out`. * * The upper (lower) bound of the output interval is rounded up (down) such that * the output interval always falls within the intput interval. The timestamp is * rounded to the nearest integer and halfway cases away from zero, and can * therefore fall outside of the output interval. * * Useful to simplify the rescaling of the arguments of FFInputFormat::read_seek2() * * @param[in] tb_in Timebase of the input `min_ts`, `ts` and `max_ts` * @param[in] tb_out Timebase of the output `min_ts`, `ts` and `max_ts` * @param[in,out] min_ts Lower bound of the interval * @param[in,out] ts Timestamp * @param[in,out] max_ts Upper bound of the interval */ void ff_rescale_interval(AVRational tb_in, AVRational tb_out, int64_t *min_ts, int64_t *ts, int64_t *max_ts); void avpriv_stream_set_need_parsing(AVStream *st, enum AVStreamParseType type); /** * Add a new chapter. * * @param s media file handle * @param id unique ID for this chapter * @param start chapter start time in time_base units * @param end chapter end time in time_base units * @param title chapter title * * @return AVChapter or NULL on error */ AVChapter *avpriv_new_chapter(AVFormatContext *s, int64_t id, AVRational time_base, int64_t start, int64_t end, const char *title); /** * Add an attached pic to an AVStream. * * @param st if set, the stream to add the attached pic to; * if unset, a new stream will be added to s. * @param pb AVIOContext to read data from if buf is unset. * @param buf if set, it contains the data and size information to be used * for the attached pic; if unset, data is read from pb. * @param size the size of the data to read if buf is unset. * * @return 0 on success, < 0 on error. On error, this function removes * the stream it has added (if any). */ int ff_add_attached_pic(AVFormatContext *s, AVStream *st, AVIOContext *pb, AVBufferRef **buf, int size); /** * Add side data to a packet for changing parameters to the given values. * Parameters set to 0 aren't included in the change. */ int ff_add_param_change(AVPacket *pkt, int32_t channels, uint64_t channel_layout, int32_t sample_rate, int32_t width, int32_t height); /** * Generate standard extradata for AVC-Intra based on width/height and field * order. */ int ff_generate_avci_extradata(AVStream *st); /** * Allocate extradata with additional AV_INPUT_BUFFER_PADDING_SIZE at end * which is always set to 0 and fill it from pb. * * @param size size of extradata * @return >= 0 if OK, AVERROR_xxx on error */ int ff_get_extradata(void *logctx, AVCodecParameters *par, AVIOContext *pb, int size); /** * Find stream index based on format-specific stream ID * @return stream index, or < 0 on error */ int ff_find_stream_index(const AVFormatContext *s, int id); int ff_buffer_packet(AVFormatContext *s, AVPacket *pkt); #endif /* AVFORMAT_DEMUX_H */
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