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authorMatthieu Bouron <matthieu.bouron@gmail.com>2012-09-20 20:31:28 +0200
committerLuca Barbato <lu_zero@gentoo.org>2014-03-06 19:28:20 +0100
commite118bb1a33889d4df56f28975b4fd0793b4f5c32 (patch)
tree9d804978f6fc2f37e07897472c7e5b1482fb7bc9 /libavformat/mxf.c
parentd48430c367947a64647c6959cf472f2c01778b17 (diff)
downloadffmpeg-e118bb1a33889d4df56f28975b4fd0793b4f5c32.tar.gz
mxf: Introduce ff_mxf_get_samples_per_frame
Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
Diffstat (limited to 'libavformat/mxf.c')
-rw-r--r--libavformat/mxf.c40
1 files changed, 40 insertions, 0 deletions
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];
+}