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echo-cancel: Split out speex code from the core module

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This splits out the echo-cancelling core from the PA-specific bits to
allow us to plug in other echo-cancellation engines.
This commit is contained in:
Arun Raghavan 2010-09-06 15:51:20 +05:30
parent 10937e4054
commit e7177680d1
4 changed files with 184 additions and 36 deletions
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64
src/modules/echo-cancel/speex.c Normal file
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/***
This file is part of PulseAudio.
Copyright 2010 Wim Taymans <wim.taymans@gmail.com>
Contributor: Arun Raghavan <arun.raghavan@collabora.co.uk>
PulseAudio is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published
by the Free Software Foundation; either version 2.1 of the License,
or (at your option) any later version.
PulseAudio is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with PulseAudio; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
USA.
***/
#include "echo-cancel.h"
pa_bool_t pa_speex_ec_init(pa_echo_canceller *ec, pa_sample_spec ss, pa_channel_map map, uint32_t filter_size_ms, uint32_t frame_size_ms)
{
int framelen, y, 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;
ec->params.priv.speex.blocksize = framelen * pa_frame_size (&ss);
pa_log_debug ("Using framelen %d, blocksize %lld, channels %d, rate %d", framelen, (long long) ec->params.priv.speex.blocksize, ss.channels, ss.rate);
ec->params.priv.speex.state = speex_echo_state_init_mc (framelen, (rate * filter_size_ms) / 1000, ss.channels, ss.channels);
if (ec->params.priv.speex.state) {
speex_echo_ctl(ec->params.priv.speex.state, SPEEX_ECHO_SET_SAMPLING_RATE, &rate);
return TRUE;
} else
return FALSE;
}
void pa_speex_ec_run(pa_echo_canceller *ec, uint8_t *rec, uint8_t *play, uint8_t *out)
{
speex_echo_cancellation(ec->params.priv.speex.state, (const spx_int16_t *) rec, (const spx_int16_t *) play, (spx_int16_t *) out);
}
void pa_speex_ec_done(pa_echo_canceller *ec)
{
speex_echo_state_destroy (ec->params.priv.speex.state);
ec->params.priv.speex.state = NULL;
}
uint32_t pa_speex_ec_get_block_size(pa_echo_canceller *ec)
{
return ec->params.priv.speex.blocksize;
}