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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.
***/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <pulsecore/modargs.h>
#include "echo-cancel.h"
/* should be between 10-20 ms */
#define DEFAULT_FRAME_SIZE_MS 20
/* should be between 100-500 ms */
#define DEFAULT_FILTER_SIZE_MS 200
static const char* const valid_modargs[] = {
"frame_size_ms",
"filter_size_ms",
NULL
};
pa_bool_t pa_speex_ec_init(pa_echo_canceller *ec, pa_sample_spec ss, pa_channel_map map, const char *args)
{
int framelen, y, rate = ss.rate;
uint32_t frame_size_ms, filter_size_ms;
pa_modargs *ma;
if (!(ma = pa_modargs_new(args, valid_modargs))) {
pa_log("Failed to parse submodule arguments.");
goto fail;
}
filter_size_ms = DEFAULT_FILTER_SIZE_MS;
if (pa_modargs_get_value_u32(ma, "filter_size_ms", &filter_size_ms) < 0 || filter_size_ms < 1 || filter_size_ms > 2000) {
pa_log("Invalid filter_size_ms specification");
goto fail;
}
frame_size_ms = DEFAULT_FRAME_SIZE_MS;
if (pa_modargs_get_value_u32(ma, "frame_size_ms", &frame_size_ms) < 0 || frame_size_ms < 1 || frame_size_ms > 200) {
pa_log("Invalid frame_size_ms specification");
goto fail;
}
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)
goto fail;
speex_echo_ctl(ec->params.priv.speex.state, SPEEX_ECHO_SET_SAMPLING_RATE, &rate);
pa_modargs_free(ma);
return TRUE;
fail:
if (ma)
pa_modargs_free(ma);
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;
}
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