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echo-cancel: keep frame_size a power of 2

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The speex echo canceler prefers a power of 2 for the frame size. Round down the
ideal frame_size to the nearest power of two. This makes sure we don't create
more than the requested frame_size_ms latency while still providing a power of 2
to the speex echo canceller.
This commit is contained in:
Wim Taymans 2010-08-31 18:04:33 +02:00
parent 1983337f0e
commit d18cae458f
1 changed files with 8 additions and 1 deletions
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9
src/modules/module-echo-cancel.c
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@ -1269,7 +1269,7 @@ int pa__init(pa_module*m) {
pa_source_new_data source_data;
pa_sink_new_data sink_data;
pa_memchunk silence;
int framelen, rate;
int framelen, rate, y;
uint32_t frame_size_ms, filter_size_ms;
uint32_t adjust_time_sec;
@ -1323,6 +1323,13 @@ int pa__init(pa_module*m) {
u->frame_size_ms = frame_size_ms;
rate = ss.rate;
framelen = (rate * frame_size_ms) / 1000;
/* framelen should be a power of 2, round down to nearest power of two */
y = 1 << ((8 * sizeof (int)) - 2);
while (y > framelen)
y >>= 1;
framelen = y;
u->blocksize = framelen * pa_frame_size (&ss);
pa_log_debug ("Using framelen %d, blocksize %lld, channels %d, rate %d", framelen, (long long) u->blocksize,
ss.channels, ss.rate);