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timecode: add avpriv_timecode_to_string().

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This commit is contained in:
Clément Bœsch 2011-12-06 11:18:26 +01:00 committed by Clément Bœsch
parent 98aca4bbef
commit ad5ade6615
2 changed files with 27 additions and 0 deletions
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16
libavcodec/timecode.c
View File

@ -79,6 +79,22 @@ static int check_timecode_rate(void *avcl, AVRational rate, int drop)
}
}
char *avpriv_timecode_to_string(char *buf, const struct ff_timecode *tc, unsigned frame)
{
int frame_num = tc->start + frame;
int fps = (tc->rate.num + tc->rate.den/2) / tc->rate.den;
int ff = frame_num % fps;
int ss = frame_num / fps % 60;
int mm = frame_num / (fps*60) % 60;
int hh = frame_num / (fps*3600) % 24;
if (tc->drop)
frame_num = ff_framenum_to_drop_timecode(frame_num);
snprintf(buf, sizeof("hh:mm:ss.ff"), "%02d:%02d:%02d%c%02d",
hh, mm, ss, tc->drop ? ';' : ':', ff);
return buf;
}
int ff_init_smtpe_timecode(void *avcl, struct ff_timecode *tc)
{
int hh, mm, ss, ff, fps, ret;

11
libavcodec/timecode.h
View File

@ -60,6 +60,17 @@ int ff_framenum_to_drop_timecode(int frame_num);
*/
uint32_t ff_framenum_to_smtpe_timecode(unsigned frame, int fps, int drop);
/**
* @brief Load timecode string in buf
* @param buf Destination buffer
* @param tc Timecode struct pointer
* @param frame Frame id (timecode frame is computed with tc->start+frame)
* @return a pointer to the buf parameter
* @note buf must have enough space to store the timecode representation
* (sizeof("hh:mm:ss.ff"))
*/
char *avpriv_timecode_to_string(char *buf, const struct ff_timecode *tc, unsigned frame);
/**
* Parse SMTPE 12M time representation (hh:mm:ss[:;.]ff). str and rate fields
* from tc struct must be set.