From e118bb1a33889d4df56f28975b4fd0793b4f5c32 Mon Sep 17 00:00:00 2001 From: Matthieu Bouron Date: Thu, 20 Sep 2012 20:31:28 +0200 Subject: mxf: Introduce ff_mxf_get_samples_per_frame Signed-off-by: Luca Barbato --- libavformat/mxf.c | 40 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 40 insertions(+) (limited to 'libavformat/mxf.c') diff --git a/libavformat/mxf.c b/libavformat/mxf.c index d3798cdb4d..01018d35f2 100644 --- a/libavformat/mxf.c +++ b/libavformat/mxf.c @@ -106,3 +106,43 @@ int ff_mxf_decode_pixel_layout(const char pixel_layout[16], enum AVPixelFormat * return -1; } + +static const MXFSamplesPerFrame mxf_spf[] = { + { { 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 +}; + +static const AVRational mxf_time_base[] = { + { 1001, 24000 }, + { 1, 24}, + { 1001, 30000 }, + { 1001, 60000 }, + { 1, 25 }, + { 1, 50 }, + { 0, 0} +}; + +const MXFSamplesPerFrame *ff_mxf_get_samples_per_frame(AVFormatContext *s, + AVRational time_base) +{ + int idx = av_find_nearest_q_idx(time_base, mxf_time_base); + AVRational diff = av_sub_q(time_base, mxf_time_base[idx]); + + diff.num = abs(diff.num); + + if (av_cmp_q(diff, (AVRational){1, 1000}) >= 0) + return NULL; + + if (av_cmp_q(time_base, mxf_time_base[idx])) + 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_spf[idx].time_base.num, + mxf_spf[idx].time_base.den); + + return &mxf_spf[idx]; +} -- cgit v1.2.3