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level: avoid division by zero on silence

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Fixes bug #630458.
This commit is contained in:
Havard Graff 2010-08-24 13:25:02 +02:00 committed by Sebastian Dröge
parent 9e7b890a22
commit 3e894a1f29
1 changed files with 5 additions and 3 deletions
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8
gst/level/gstlevel.c
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@ -114,6 +114,8 @@
GST_DEBUG_CATEGORY_STATIC (level_debug);
#define GST_CAT_DEFAULT level_debug
#define EPSILON 1e-35f
static GstStaticPadTemplate sink_template_factory =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
@ -676,10 +678,10 @@ gst_level_transform_ip (GstBaseTransform * trans, GstBuffer * in)
"message: last_peak: %f, decay_peak: %f",
filter->last_peak[i], filter->decay_peak[i]);
/* RMS values are calculated in amplitude, so 20 * log 10 */
RMSdB = 20 * log10 (RMS);
RMSdB = 20 * log10 (RMS + EPSILON);
/* peak values are square sums, ie. power, so 10 * log 10 */
lastdB = 10 * log10 (filter->last_peak[i]);
decaydB = 10 * log10 (filter->decay_peak[i]);
lastdB = 10 * log10 (filter->last_peak[i] + EPSILON);
decaydB = 10 * log10 (filter->decay_peak[i] + EPSILON);
if (filter->decay_peak[i] < filter->last_peak[i]) {
/* this can happen in certain cases, for example when