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avutil: support 50 and 60 frame rates in timecode api

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Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Matthieu Bouron 2012-05-27 14:21:39 +02:00 • committed by Michael Niedermayer
parent 3be02afb56
commit 789f8cb03a
4 changed files with 41 additions and 5 deletions
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28
libavutil/timecode.c
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@ -31,6 +31,7 @@
#include "log.h"
#include "error.h"
#ifdef FF_API_OLD_TC_ADJUST_FRAMENUM
int av_timecode_adjust_ntsc_framenum(int framenum)
{
/* only works for NTSC 29.97 */
@ -39,6 +40,25 @@ int av_timecode_adjust_ntsc_framenum(int framenum)
//if (m < 2) m += 2; /* not needed since -2,-1 / 1798 in C returns 0 */
return framenum + 18 * d + 2 * ((m - 2) / 1798);
}
#endif
int av_timecode_adjust_ntsc_framenum2(int framenum, int fps)
{
/* only works for NTSC 29.97 and 59.94 */
int drop_frames = 0;
int d = framenum / 17982;
int m = framenum % 17982;
if (fps == 30)
drop_frames = 2;
else if (fps == 60)
drop_frames = 4;
else
return framenum;
//if (m < 2) m += 2; /* not needed since -2,-1 / 1798 in C returns 0 */
return framenum + 9 * drop_frames * d + drop_frames * ((m - 2) / 1798);
}
uint32_t av_timecode_get_smpte_from_framenum(const AVTimecode *tc, int framenum)
{
@ -48,7 +68,7 @@ uint32_t av_timecode_get_smpte_from_framenum(const AVTimecode *tc, int framenum)
framenum += tc->start;
if (drop)
framenum = av_timecode_adjust_ntsc_framenum(framenum);
framenum = av_timecode_adjust_ntsc_framenum2(framenum, tc->fps);
ff = framenum % fps;
ss = framenum / fps % 60;
mm = framenum / (fps*60) % 60;
@ -77,7 +97,7 @@ char *av_timecode_make_string(const AVTimecode *tc, char *buf, int framenum)
framenum += tc->start;
if (drop)
framenum = av_timecode_adjust_ntsc_framenum(framenum);
framenum = av_timecode_adjust_ntsc_framenum2(framenum, fps);
if (framenum < 0) {
framenum = -framenum;
neg = tc->flags & AV_TIMECODE_FLAG_ALLOWNEGATIVE;
@ -139,7 +159,9 @@ static int check_timecode(void *log_ctx, AVTimecode *tc)
switch (tc->fps) {
case 24:
case 25:
case 30: return 0;
case 30:
case 50:
case 60: return 0;
default:
av_log(log_ctx, AV_LOG_ERROR, "Timecode frame rate not supported\n");