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echo-cancel: Add function pa_echo_canceller_blocksize_power2()

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computes EC block size in frames (rounded down to nearest power-of-2) based
on sample rate and milliseconds

move code from speex AEC implementation to module-echo-cancel such that
functionality can be reused by other AEC implementations

Signed-off-by: Peter Meerwald <p.meerwald@bct-electronic.com>
This commit is contained in:
Peter Meerwald 2013-02-13 17:26:51 +01:00 • committed by Tanu Kaskinen
parent e845c86c64
commit db7415b7e9
3 changed files with 22 additions and 9 deletions
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12
src/modules/echo-cancel/speex.c
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@ -151,7 +151,7 @@ pa_bool_t pa_speex_ec_init(pa_core *c, pa_echo_canceller *ec,
uint32_t *nframes, const char *args)
{
int rate;
uint32_t y, frame_size_ms, filter_size_ms;
uint32_t frame_size_ms, filter_size_ms;
pa_modargs *ma;
if (!(ma = pa_modargs_new(args, valid_modargs))) {
@ -174,16 +174,10 @@ pa_bool_t pa_speex_ec_init(pa_core *c, pa_echo_canceller *ec,
pa_speex_ec_fixate_spec(source_ss, source_map, sink_ss, sink_map);
rate = source_ss->rate;
*nframes = (rate * frame_size_ms) / 1000;
/* nframes should be a power of 2, round down to nearest power of two */
y = 1 << ((8 * sizeof (uint32_t)) - 2);
while (y > *nframes)
y >>= 1;
*nframes = y;
*nframes = pa_echo_canceller_blocksize_power2(rate, frame_size_ms);
pa_log_debug ("Using nframes %d, channels %d, rate %d", *nframes, source_ss->channels, source_ss->rate);
ec->params.priv.speex.state = speex_echo_state_init_mc (*nframes, (rate * filter_size_ms) / 1000, source_ss->channels, source_ss->channels);
ec->params.priv.speex.state = speex_echo_state_init_mc(*nframes, (rate * filter_size_ms) / 1000, source_ss->channels, source_ss->channels);
if (!ec->params.priv.speex.state)
goto fail;