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/***
This file is part of PulseAudio.
Copyright 2010 Arun Raghavan <arun.raghavan@collabora.co.uk>
Contributor: Wim Taymans <wim.taymans@gmail.com>
The actual implementation is taken from the sources at
http://andreadrian.de/intercom/ - for the license, look for
adrian-license.txt in the same directory as this file.
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
static const char* const valid_modargs[] = {
"frame_size_ms",
NULL
};
static void pa_adrian_ec_fixate_spec(pa_sample_spec *source_ss, pa_channel_map *source_map,
pa_sample_spec *sink_ss, pa_channel_map *sink_map)
{
source_ss->format = PA_SAMPLE_S16LE;
source_ss->channels = 1;
pa_channel_map_init_mono(source_map);
*sink_ss = *source_ss;
*sink_map = *source_map;
}
pa_bool_t pa_adrian_ec_init(pa_echo_canceller *ec,
pa_sample_spec *source_ss, pa_channel_map *source_map,
pa_sample_spec *sink_ss, pa_channel_map *sink_map,
uint32_t *blocksize, const char *args)
{
int framelen, rate;
uint32_t frame_size_ms;
pa_modargs *ma;
if (!(ma = pa_modargs_new(args, valid_modargs))) {
pa_log("Failed to parse submodule arguments.");
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;
}
pa_adrian_ec_fixate_spec(source_ss, source_map, sink_ss, sink_map);
rate = source_ss->rate;
framelen = (rate * frame_size_ms) / 1000;
*blocksize = ec->params.priv.adrian.blocksize = framelen * pa_frame_size (source_ss);
pa_log_debug ("Using framelen %d, blocksize %u, channels %d, rate %d", framelen, ec->params.priv.adrian.blocksize, source_ss->channels, source_ss->rate);
ec->params.priv.adrian.aec = AEC_init(rate);
if (!ec->params.priv.adrian.aec)
goto fail;
pa_modargs_free(ma);
return TRUE;
fail:
if (ma)
pa_modargs_free(ma);
return FALSE;
}
void pa_adrian_ec_run(pa_echo_canceller *ec, uint8_t *rec, uint8_t *play, uint8_t *out)
{
unsigned int i;
for (i = 0; i < ec->params.priv.adrian.blocksize; i += 2) {
/* We know it's S16LE mono data */
int r = (((int8_t) rec[i + 1]) << 8) | rec[i];
int p = (((int8_t) play[i + 1]) << 8) | play[i];
int res;
res = AEC_doAEC(ec->params.priv.adrian.aec, r, p);
out[i] = (uint8_t) (res & 0xff);
out[i + 1] = (uint8_t) ((res >> 8) & 0xff);
}
}
void pa_adrian_ec_done(pa_echo_canceller *ec)
{
pa_xfree(ec->params.priv.adrian.aec);
ec->params.priv.adrian.aec = NULL;
}
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