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avfilter/af_dynaudnorm: improve pre-filling code

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In order to avoid possible clipping at the very
beginning. Especially apparent when "alternative"
boundary mode is used.

Adopted from original commit by committer.
This commit is contained in:
LoRd_MuldeR 2016-08-02 19:50:26 +02:00 committed by Paul B Mahol
parent 82b84c71b0
commit 8ab200fb8a
1 changed files with 15 additions and 6 deletions
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21
libavfilter/af_dynaudnorm.c
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@ -439,15 +439,12 @@ static void update_gain_history(DynamicAudioNormalizerContext *s, int channel,
if (cqueue_empty(s->gain_history_original[channel]) ||
cqueue_empty(s->gain_history_minimum[channel])) {
const int pre_fill_size = s->filter_size / 2;
const double initial_value = s->alt_boundary_mode ? current_gain_factor : 1.0;
s->prev_amplification_factor[channel] = s->alt_boundary_mode ? current_gain_factor : 1.0;
s->prev_amplification_factor[channel] = initial_value;
while (cqueue_size(s->gain_history_original[channel]) < pre_fill_size) {
cqueue_enqueue(s->gain_history_original[channel], s->alt_boundary_mode ? current_gain_factor : 1.0);
}
while (cqueue_size(s->gain_history_minimum[channel]) < pre_fill_size) {
cqueue_enqueue(s->gain_history_minimum[channel], s->alt_boundary_mode ? current_gain_factor : 1.0);
cqueue_enqueue(s->gain_history_original[channel], initial_value);
}
}
@ -456,6 +453,18 @@ static void update_gain_history(DynamicAudioNormalizerContext *s, int channel,
while (cqueue_size(s->gain_history_original[channel]) >= s->filter_size) {
double minimum;
av_assert0(cqueue_size(s->gain_history_original[channel]) == s->filter_size);
if (cqueue_empty(s->gain_history_minimum[channel])) {
const int pre_fill_size = s->filter_size / 2;
double initial_value = s->alt_boundary_mode ? cqueue_peek(s->gain_history_original[channel], 0) : 1.0;
int input = pre_fill_size;
while (cqueue_size(s->gain_history_minimum[channel]) < pre_fill_size) {
initial_value = FFMIN(initial_value, cqueue_peek(s->gain_history_original[channel], ++input));
cqueue_enqueue(s->gain_history_minimum[channel], initial_value);
}
}
minimum = minimum_filter(s->gain_history_original[channel]);
cqueue_enqueue(s->gain_history_minimum[channel], minimum);