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lfe-filter: Deal with empty input chunks

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It is possible that we get a zero-length memchunk to work with.
Specifically, this happens the resampler (which is called before the
lfe-filter) consumes all the input data, but does not (yet) produce any
output data.

Reproduced using:

  pulseaudio --resample-method=soxr-mq
  pactl load-module module-null-sink sink_name=lfe_test channels=3 channel_map=front-left,front-right,lfe
  paplay --raw /dev/zero --rate=48000 -d lfe_test

Thanks to the original reporter for the backtrace:

Bug: https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/1496577
This commit is contained in:
Arun Raghavan 2015-09-17 09:44:49 +05:30 • committed by David Henningsson
parent 3193f6a2c4
commit 76e2cec9a2
1 changed files with 1 additions and 1 deletions
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2
src/pulsecore/filter/lfe-filter.c
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@ -113,7 +113,7 @@ pa_memchunk * pa_lfe_filter_process(pa_lfe_filter_t *f, pa_memchunk *buf) {
struct saved_state *s, *s2;
void *data;
if (!f->active)
if (!f->active || !buf->length)
return buf;
/* Remove old states (FIXME: we could do better than searching the entire array here?) */