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mxf: export ff_mxf_get_samples_per_frame to lavf

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Reviewed-by: Tomas Härdin <tomas.hardin@codemill.se>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Matthieu Bouron 2012-09-20 20:31:28 +02:00 • committed by Michael Niedermayer
parent 7bc70930dd
commit 41f7e0649f
3 changed files with 38 additions and 36 deletions
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29
libavformat/mxf.c
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@ -106,3 +106,32 @@ int ff_mxf_decode_pixel_layout(const char pixel_layout[16], enum PixelFormat *pi
return -1;
}
static const MXFSamplesPerFrame mxf_samples_per_frames[] = {
{ { 1001, 24000 }, { 2002, 0, 0, 0, 0, 0 } }, // FILM 23.976
{ { 1, 24}, { 2000, 0, 0, 0, 0, 0 } }, // FILM 24
{ { 1001, 30000 }, { 1602, 1601, 1602, 1601, 1602, 0 } }, // NTSC 29.97
{ { 1001, 60000 }, { 801, 801, 801, 801, 800, 0 } }, // NTSC 59.94
{ { 1, 25 }, { 1920, 0, 0, 0, 0, 0 } }, // PAL 25
{ { 1, 50 }, { 960, 0, 0, 0, 0, 0 } }, // PAL 50
};
const MXFSamplesPerFrame *ff_mxf_get_samples_per_frame(AVFormatContext *s, AVRational time_base)
{
int i;
for (i = 0; i < FF_ARRAY_ELEMS(mxf_samples_per_frames); i++) {
if (!av_cmp_q(mxf_samples_per_frames[i].time_base, time_base))
return &mxf_samples_per_frames[i];
}
// Find closest container time base for approximative codec time base like 1/29.97, 1/30, ...
for (i = 0; i < FF_ARRAY_ELEMS(mxf_samples_per_frames); i++) {
if (fabs(av_q2d(mxf_samples_per_frames[i].time_base) - av_q2d(time_base)) < 0.0001) {
av_log(s, AV_LOG_WARNING, "%d/%d input time base matched %d/%d container time base\n",
time_base.num, time_base.den,
mxf_samples_per_frames[i].time_base.num, mxf_samples_per_frames[i].time_base.den);
return &mxf_samples_per_frames[i];
}
}
return NULL;
}