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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, see <http://www.gnu.org/licenses/>.
***/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <pulsecore/core-util.h>
#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
#define DEFAULT_AGC_ENABLED true
#define DEFAULT_DENOISE_ENABLED true
#define DEFAULT_ECHO_SUPPRESS_ENABLED true
#define DEFAULT_ECHO_SUPPRESS_ATTENUATION 0
static const char* const valid_modargs[] = {
"frame_size_ms",
"filter_size_ms",
"agc",
"denoise",
"echo_suppress",
"echo_suppress_attenuation",
"echo_suppress_attenuation_active",
NULL
};
static void pa_speex_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;
*play_ss = *out_ss;
*play_map = *out_map;
*rec_ss = *out_ss;
*rec_map = *out_map;
}
static bool pa_speex_ec_preprocessor_init(pa_echo_canceller *ec, pa_sample_spec *out_ss, uint32_t nframes, pa_modargs *ma) {
bool agc;
bool denoise;
bool echo_suppress;
int32_t echo_suppress_attenuation;
int32_t echo_suppress_attenuation_active;
agc = DEFAULT_AGC_ENABLED;
if (pa_modargs_get_value_boolean(ma, "agc", &agc) < 0) {
pa_log("Failed to parse agc value");
goto fail;
}
denoise = DEFAULT_DENOISE_ENABLED;
if (pa_modargs_get_value_boolean(ma, "denoise", &denoise) < 0) {
pa_log("Failed to parse denoise value");
goto fail;
}
echo_suppress = DEFAULT_ECHO_SUPPRESS_ENABLED;
if (pa_modargs_get_value_boolean(ma, "echo_suppress", &echo_suppress) < 0) {
pa_log("Failed to parse echo_suppress value");
goto fail;
}
echo_suppress_attenuation = DEFAULT_ECHO_SUPPRESS_ATTENUATION;
if (pa_modargs_get_value_s32(ma, "echo_suppress_attenuation", &echo_suppress_attenuation) < 0) {
pa_log("Failed to parse echo_suppress_attenuation value");
goto fail;
}
if (echo_suppress_attenuation > 0) {
pa_log("echo_suppress_attenuation should be a negative dB value");
goto fail;
}
echo_suppress_attenuation_active = DEFAULT_ECHO_SUPPRESS_ATTENUATION;
if (pa_modargs_get_value_s32(ma, "echo_suppress_attenuation_active", &echo_suppress_attenuation_active) < 0) {
pa_log("Failed to parse echo_suppress_attenuation_active value");
goto fail;
}
if (echo_suppress_attenuation_active > 0) {
pa_log("echo_suppress_attenuation_active should be a negative dB value");
goto fail;
}
if (agc || denoise || echo_suppress) {
spx_int32_t tmp;
if (out_ss->channels != 1) {
pa_log("AGC, denoising and echo suppression only work with channels=1");
goto fail;
}
ec->params.priv.speex.pp_state = speex_preprocess_state_init(nframes, out_ss->rate);
tmp = agc;
speex_preprocess_ctl(ec->params.priv.speex.pp_state, SPEEX_PREPROCESS_SET_AGC, &tmp);
tmp = denoise;
speex_preprocess_ctl(ec->params.priv.speex.pp_state, SPEEX_PREPROCESS_SET_DENOISE, &tmp);
if (echo_suppress) {
if (echo_suppress_attenuation)
speex_preprocess_ctl(ec->params.priv.speex.pp_state, SPEEX_PREPROCESS_SET_ECHO_SUPPRESS,
&echo_suppress_attenuation);
if (echo_suppress_attenuation_active) {
speex_preprocess_ctl(ec->params.priv.speex.pp_state, SPEEX_PREPROCESS_SET_ECHO_SUPPRESS_ACTIVE,
&echo_suppress_attenuation_active);
}
speex_preprocess_ctl(ec->params.priv.speex.pp_state, SPEEX_PREPROCESS_SET_ECHO_STATE,
ec->params.priv.speex.state);
}
pa_log_info("Loaded speex preprocessor with params: agc=%s, denoise=%s, echo_suppress=%s", pa_yes_no(agc),
pa_yes_no(denoise), pa_yes_no(echo_suppress));
} else
pa_log_info("All preprocessing options are disabled");
return true;
fail:
return false;
}
bool pa_speex_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;
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;
}
pa_speex_ec_fixate_spec(rec_ss, rec_map, play_ss, play_map, out_ss, out_map);
rate = out_ss->rate;
*nframes = pa_echo_canceller_blocksize_power2(rate, frame_size_ms);
pa_log_debug ("Using nframes %d, channels %d, rate %d", *nframes, out_ss->channels, out_ss->rate);
ec->params.priv.speex.state = speex_echo_state_init_mc(*nframes, (rate * filter_size_ms) / 1000, out_ss->channels, out_ss->channels);
if (!ec->params.priv.speex.state)
goto fail;
speex_echo_ctl(ec->params.priv.speex.state, SPEEX_ECHO_SET_SAMPLING_RATE, &rate);
if (!pa_speex_ec_preprocessor_init(ec, out_ss, *nframes, ma))
goto fail;
pa_modargs_free(ma);
return true;
fail:
if (ma)
pa_modargs_free(ma);
if (ec->params.priv.speex.pp_state) {
speex_preprocess_state_destroy(ec->params.priv.speex.pp_state);
ec->params.priv.speex.pp_state = NULL;
}
if (ec->params.priv.speex.state) {
speex_echo_state_destroy(ec->params.priv.speex.state);
ec->params.priv.speex.state = NULL;
}
return false;
}
void pa_speex_ec_run(pa_echo_canceller *ec, const uint8_t *rec, const 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);
/* preprecessor is run after AEC. This is not a mistake! */
if (ec->params.priv.speex.pp_state)
speex_preprocess_run(ec->params.priv.speex.pp_state, (spx_int16_t *) out);
}
void pa_speex_ec_done(pa_echo_canceller *ec) {
if (ec->params.priv.speex.pp_state) {
speex_preprocess_state_destroy(ec->params.priv.speex.pp_state);
ec->params.priv.speex.pp_state = NULL;
}
if (ec->params.priv.speex.state) {
speex_echo_state_destroy(ec->params.priv.speex.state);
ec->params.priv.speex.state = NULL;
}
}
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