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avformat/seek: add ff_rescale_interval() function

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Refactors a function used by avformat/concat and avformat/imf.

Signed-off-by: Zane van Iperen <zane@zanevaniperen.com>
This commit is contained in:
Pierre-Anthony Lemieux 2022-03-11 09:16:50 -08:00 committed by Zane van Iperen
parent 22e1175e39
commit b172c0f8c5
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2 changed files with 30 additions and 0 deletions
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20
libavformat/internal.h
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@ -1023,4 +1023,24 @@ void avpriv_register_devices(const AVOutputFormat * const o[], const AVInputForm
*/ */
int ff_format_shift_data(AVFormatContext *s, int64_t read_start, int shift_size); int ff_format_shift_data(AVFormatContext *s, int64_t read_start, int shift_size);
/**
* 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_INTERNAL_H */ #endif /* AVFORMAT_INTERNAL_H */

10
libavformat/seek.c
View File

@ -751,3 +751,13 @@ int avformat_flush(AVFormatContext *s)
ff_read_frame_flush(s); ff_read_frame_flush(s);
return 0; return 0;
} }
void ff_rescale_interval(AVRational tb_in, AVRational tb_out,
int64_t *min_ts, int64_t *ts, int64_t *max_ts)
{
*ts = av_rescale_q (* ts, tb_in, tb_out);
*min_ts = av_rescale_q_rnd(*min_ts, tb_in, tb_out,
AV_ROUND_UP | AV_ROUND_PASS_MINMAX);
*max_ts = av_rescale_q_rnd(*max_ts, tb_in, tb_out,
AV_ROUND_DOWN | AV_ROUND_PASS_MINMAX);
}