diff options
author | Andreas Rheinhardt <andreas.rheinhardt@outlook.com> | 2022-05-06 18:28:08 +0200 |
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committer | Andreas Rheinhardt <andreas.rheinhardt@outlook.com> | 2022-05-10 07:37:38 +0200 |
commit | 35ec5c819b0f472536eb48e8f3871eb5ca222da6 (patch) | |
tree | baa0423f54594b4d020f38114ff06034cec6707b /libavformat/demux.h | |
parent | 20ca491664513c936f7960473b833038b0d5ca99 (diff) |
avformat/demux: Add new demux.h header
And move those stuff already in demuxer-only files to it.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
Diffstat (limited to 'libavformat/demux.h')
-rw-r--r-- | libavformat/demux.h | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/libavformat/demux.h b/libavformat/demux.h new file mode 100644 index 0000000000..f003d81f52 --- /dev/null +++ b/libavformat/demux.h @@ -0,0 +1,145 @@ +/* + * 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" + +#define RELATIVE_TS_BASE (INT64_MAX - (1LL << 48)) + +static av_always_inline int is_relative(int64_t ts) +{ + return ts > (RELATIVE_TS_BASE - (1LL << 48)); +} + +/** + * 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 + * AVInputFormat.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 AVInputFormat::read_seek2() + * + * @param[in] tb_in Timebase of the input `min_ts`, `ts` and `max_ts` + * @param[in] tb_out Timebase of the ouput `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); + +#endif /* AVFORMAT_DEMUX_H */ |