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libav: avoid dividing by zero on insane fps/par

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While there, fix mixup in num/den with par (copied from fps,
apparently, and fps inverts fps to time base).

Coverity 1139696
This commit is contained in:
Vincent Penquerc'h 2014-04-30 16:14:50 +01:00
parent 3529de1784
commit 4f1fd2687d
1 changed files with 30 additions and 13 deletions
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27
ext/libav/gstavcodecmap.c
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@ -2379,7 +2379,12 @@ gst_ffmpeg_caps_to_pixfmt (const GstCaps * caps,
fps = gst_structure_get_value (structure, "framerate");
if (fps != NULL && GST_VALUE_HOLDS_FRACTION (fps)) {
int num = gst_value_get_fraction_numerator (fps);
int den = gst_value_get_fraction_denominator (fps);
if (num > 0 && den > 0) {
/* somehow these seem mixed up.. */
/* they're fine, this is because it does period=1/frequency */
context->time_base.den = gst_value_get_fraction_numerator (fps);
context->time_base.num = gst_value_get_fraction_denominator (fps);
context->ticks_per_frame = 1;
@ -2387,18 +2392,30 @@ gst_ffmpeg_caps_to_pixfmt (const GstCaps * caps,
GST_DEBUG ("setting framerate %d/%d = %lf",
context->time_base.den, context->time_base.num,
1. * context->time_base.den / context->time_base.num);
} else {
GST_WARNING ("ignoring insane framerate %d/%d",
context->time_base.den, context->time_base.num);
}
}
par = gst_structure_get_value (structure, "pixel-aspect-ratio");
if (par && GST_VALUE_HOLDS_FRACTION (par)) {
context->sample_aspect_ratio.num = gst_value_get_fraction_numerator (par);
context->sample_aspect_ratio.den = gst_value_get_fraction_denominator (par);
int num = gst_value_get_fraction_numerator (par);
int den = gst_value_get_fraction_denominator (par);
if (num > 0 && den > 0) {
context->sample_aspect_ratio.num = num;
context->sample_aspect_ratio.den = den;
GST_DEBUG ("setting pixel-aspect-ratio %d/%d = %lf",
context->sample_aspect_ratio.den, context->sample_aspect_ratio.num,
1. * context->sample_aspect_ratio.den /
context->sample_aspect_ratio.num);
context->sample_aspect_ratio.num, context->sample_aspect_ratio.den,
1. * context->sample_aspect_ratio.num /
context->sample_aspect_ratio.den);
} else {
GST_WARNING ("ignoring insane pixel-aspect-ratio %d/%d",
context->sample_aspect_ratio.num, context->sample_aspect_ratio.den);
}
}
if (!raw)