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mxf: move framenum to timecode convert to timecode helpers.

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This is based on the original work by Baptiste Coudurier.
This commit is contained in:
Clément Bœsch
2011-07-06 15:04:26 +02:00
committed by Clément Bœsch
parent b7b72963e0
commit 4c3c6e60f9
3 changed files with 30 additions and 19 deletions
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18
libavcodec/timecode.c
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@@ -37,6 +37,24 @@ int ff_framenum_to_drop_timecode(int frame_num)
return frame_num + 18 * d + 2 * ((m - 2) / 1798);
}
uint32_t ff_framenum_to_smtpe_timecode(unsigned frame, int fps, int drop)
{
return (0 << 31) | // color frame flag
(drop << 30) | // drop frame flag
( ((frame % fps) / 10) << 28) | // tens of frames
( ((frame % fps) % 10) << 24) | // units of frames
(0 << 23) | // field phase (NTSC), b0 (PAL)
((((frame / fps) % 60) / 10) << 20) | // tens of seconds
((((frame / fps) % 60) % 10) << 16) | // units of seconds
(0 << 15) | // b0 (NTSC), b2 (PAL)
((((frame / (fps * 60)) % 60) / 10) << 12) | // tens of minutes
((((frame / (fps * 60)) % 60) % 10) << 8) | // units of minutes
(0 << 7) | // b1
(0 << 6) | // b2 (NTSC), field phase (PAL)
((((frame / (fps * 3600) % 24)) / 10) << 4) | // tens of hours
( (frame / (fps * 3600) % 24)) % 10; // units of hours
}
int ff_init_smtpe_timecode(void *avcl, struct ff_timecode *tc)
{
int hh, mm, ss, ff, fps;