From: Pierre-Anthony Lemieux <p...@palemieux.com> Refactors a function used by avformat/concat and avformat/imf.
--- libavformat/avio_internal.h | 21 +++++++++++++++++++++ libavformat/seek.c | 10 ++++++++++ 2 files changed, 31 insertions(+) diff --git a/libavformat/avio_internal.h b/libavformat/avio_internal.h index 1f5e3d474b..ef2ec7864f 100644 --- a/libavformat/avio_internal.h +++ b/libavformat/avio_internal.h @@ -23,6 +23,7 @@ #include "url.h" #include "libavutil/log.h" +#include "libavutil/rational.h" extern const AVClass ff_avio_class; @@ -281,4 +282,24 @@ int64_t ff_read_line_to_bprint_overwrite(AVIOContext *s, struct AVBPrint *bp); int64_t ff_read_string_to_bprint_overwrite(AVIOContext *s, struct AVBPrint *bp, int64_t max_len); +/** + * 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_AVIO_INTERNAL_H */ diff --git a/libavformat/seek.c b/libavformat/seek.c index 405ca316b3..890aea7f8a 100644 --- a/libavformat/seek.c +++ b/libavformat/seek.c @@ -751,3 +751,13 @@ int avformat_flush(AVFormatContext *s) ff_read_frame_flush(s); 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); +} -- 2.17.1 _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".