diff options
Diffstat (limited to 'chromium/third_party/ffmpeg/libavutil/mathematics.h')
| -rw-r--r-- | chromium/third_party/ffmpeg/libavutil/mathematics.h | 21 |
1 files changed, 19 insertions, 2 deletions
diff --git a/chromium/third_party/ffmpeg/libavutil/mathematics.h b/chromium/third_party/ffmpeg/libavutil/mathematics.h index 71f0392218d..88739e80b8f 100644 --- a/chromium/third_party/ffmpeg/libavutil/mathematics.h +++ b/chromium/third_party/ffmpeg/libavutil/mathematics.h @@ -45,6 +45,9 @@ #ifndef M_PI #define M_PI 3.14159265358979323846 /* pi */ #endif +#ifndef M_PI_2 +#define M_PI_2 1.57079632679489661923 /* pi/2 */ +#endif #ifndef M_SQRT1_2 #define M_SQRT1_2 0.70710678118654752440 /* 1/sqrt(2) */ #endif @@ -133,14 +136,28 @@ int64_t av_compare_mod(uint64_t a, uint64_t b, uint64_t mod); * Rescale a timestamp while preserving known durations. * * @param in_ts Input timestamp - * @param in_tb Input timesbase + * @param in_tb Input timebase * @param fs_tb Duration and *last timebase * @param duration duration till the next call - * @param out_tb Output timesbase + * @param out_tb Output timebase */ int64_t av_rescale_delta(AVRational in_tb, int64_t in_ts, AVRational fs_tb, int duration, int64_t *last, AVRational out_tb); /** + * Add a value to a timestamp. + * + * This function gurantees that when the same value is repeatly added that + * no accumulation of rounding errors occurs. + * + * @param ts Input timestamp + * @param ts_tb Input timestamp timebase + * @param inc value to add to ts + * @param inc_tb inc timebase + */ +int64_t av_add_stable(AVRational ts_tb, int64_t ts, AVRational inc_tb, int64_t inc); + + + /** * @} */ |