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avfilter/af_volume: fix precision=fixed and volume=0 case 

When precision is fixed and volume is 0, filter_frame does not
perform any operation on the output buffer. This works if the
output buffer has been allocated and zeroed with ff_get_audio_buffer
but not if the input buffer is used as output buffer.

Fix this by not using the input buffer as output buffer if
precision is fixed and volume is 0.

Signed-off-by: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Gilles Chanteperdrix 2015-02-28 23:15:39 +01:00 committed by Michael Niedermayer
parent 5cb6b53050
commit dcf19008a6
1 changed files with 2 additions and 1 deletions
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3
libavfilter/af_volume.c
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@ -402,7 +402,8 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *buf)
}
/* do volume scaling in-place if input buffer is writable */
if (av_frame_is_writable(buf)) {
if (av_frame_is_writable(buf)
&& (vol->precision != PRECISION_FIXED || vol->volume_i > 0)) {
out_buf = buf;
} else {
out_buf = ff_get_audio_buffer(inlink, nb_samples);