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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, see <http://www.gnu.org/licenses/>.
***/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <pulse/xmalloc.h>
#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 *rec_ss, pa_channel_map *rec_map,
pa_sample_spec *play_ss, pa_channel_map *play_map,
pa_sample_spec *out_ss, pa_channel_map *out_map) {
out_ss->format = PA_SAMPLE_S16NE;
out_ss->channels = 1;
pa_channel_map_init_mono(out_map);
*play_ss = *out_ss;
*play_map = *out_map;
*rec_ss = *out_ss;
*rec_map = *out_map;
}
bool pa_adrian_ec_init(pa_core *c, pa_echo_canceller *ec,
pa_sample_spec *rec_ss, pa_channel_map *rec_map,
pa_sample_spec *play_ss, pa_channel_map *play_map,
pa_sample_spec *out_ss, pa_channel_map *out_map,
uint32_t *nframes, const char *args) {
int rate, have_vector = 0;
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(rec_ss, rec_map, play_ss, play_map, out_ss, out_map);
rate = out_ss->rate;
*nframes = (rate * frame_size_ms) / 1000;
ec->params.adrian.blocksize = (*nframes) * pa_frame_size(out_ss);
pa_log_debug ("Using nframes %d, blocksize %u, channels %d, rate %d", *nframes, ec->params.adrian.blocksize, out_ss->channels, out_ss->rate);
/* For now we only support SSE */
if (c->cpu_info.cpu_type == PA_CPU_X86 && (c->cpu_info.flags.x86 & PA_CPU_X86_SSE))
have_vector = 1;
ec->params.adrian.aec = AEC_init(rate, have_vector);
if (!ec->params.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, const uint8_t *rec, const uint8_t *play, uint8_t *out) {
unsigned int i;
for (i = 0; i < ec->params.adrian.blocksize; i += 2) {
/* We know it's S16NE mono data */
int r = *(int16_t *)(rec + i);
int p = *(int16_t *)(play + i);
*(int16_t *)(out + i) = (int16_t) AEC_doAEC(ec->params.adrian.aec, r, p);
}
}
void pa_adrian_ec_done(pa_echo_canceller *ec) {
if (ec->params.adrian.aec) {
AEC_done(ec->params.adrian.aec);
ec->params.adrian.aec = NULL;
}
}
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