void kill_filter_audio(Filter_Audio *f_a)
{
if (!f_a) {
return;
}
WebRtcNsx_Free(f_a->noise_sup_x);
WebRtcAgc_Free(f_a->gain_control);
WebRtcAec_Free(f_a->echo_cancellation);
WebRtcVad_Free(f_a->Vad_handle);
speex_resampler_destroy(f_a->upsampler);
speex_resampler_destroy(f_a->downsampler);
speex_resampler_destroy(f_a->downsampler_echo);
free(f_a);
}
Filter_Audio *new_filter_audio(uint32_t fs)
{
if (fs == 0) {
return NULL;
}
Filter_Audio *f_a = calloc(sizeof(Filter_Audio), 1);
if (!f_a) {
return NULL;
}
f_a->fs = fs;
if (fs != 16000)
fs = 32000;
init_highpass_filter_zam(&f_a->hpfa, 100, (float) f_a->fs);
init_highpass_filter_zam(&f_a->hpfb, 100, (float) f_a->fs);
unsigned int lowpass_filter_frequency = 12000;
if (f_a->fs > (lowpass_filter_frequency * 2)) {
init_lowpass_filter_zam(&f_a->lpfa, lowpass_filter_frequency, (float) f_a->fs);
init_lowpass_filter_zam(&f_a->lpfb, lowpass_filter_frequency, (float) f_a->fs);
f_a->lowpass_enabled = 1;
}
if (WebRtcAgc_Create(&f_a->gain_control) == -1) {
free(f_a);
return NULL;
}
if (WebRtcNsx_Create(&f_a->noise_sup_x) == -1) {
WebRtcAgc_Free(f_a->gain_control);
free(f_a);
return NULL;
}
if (WebRtcAec_Create(&f_a->echo_cancellation) == -1) {
WebRtcAgc_Free(f_a->gain_control);
WebRtcNsx_Free(f_a->noise_sup_x);
free(f_a);
return NULL;
}
if (WebRtcVad_Create(&f_a->Vad_handle) == -1){
WebRtcAec_Free(f_a->echo_cancellation);
WebRtcAgc_Free(f_a->gain_control);
WebRtcNsx_Free(f_a->noise_sup_x);
free(f_a);
return NULL;
}
WebRtcAgc_config_t gain_config;
gain_config.targetLevelDbfs = 1;
gain_config.compressionGaindB = 20;
gain_config.limiterEnable = kAgcTrue;
if (WebRtcAgc_Init(f_a->gain_control, 0, 255, kAgcModeAdaptiveDigital, fs) == -1 || WebRtcAgc_set_config(f_a->gain_control, gain_config) == -1) {
kill_filter_audio(f_a);
return NULL;
}
if (WebRtcNsx_Init(f_a->noise_sup_x, fs) == -1 || WebRtcNsx_set_policy(f_a->noise_sup_x, 2) == -1) {
kill_filter_audio(f_a);
return NULL;
}
AecConfig echo_config;
echo_config.nlpMode = kAecNlpAggressive;
echo_config.skewMode = kAecFalse;
echo_config.metricsMode = kAecFalse;
echo_config.delay_logging = kAecFalse;
if (WebRtcAec_Init(f_a->echo_cancellation, fs, f_a->fs) == -1 || WebRtcAec_set_config(f_a->echo_cancellation, echo_config) == -1) {
kill_filter_audio(f_a);
return NULL;
}
int vad_mode = 1; //Aggressiveness mode (0, 1, 2, or 3).
if (WebRtcVad_Init(f_a->Vad_handle) == -1 || WebRtcVad_set_mode(f_a->Vad_handle,vad_mode) == -1){
kill_filter_audio(f_a);
return NULL;
}
f_a->echo_enabled = 1;
f_a->gain_enabled = 1;
f_a->noise_enabled = 1;
f_a->vad_enabled = 1;
int quality = 4;
if (f_a->fs != 16000) {
f_a->downsampler = speex_resampler_init(1, f_a->fs, 32000, quality, 0);
f_a->upsampler = speex_resampler_init(1, 32000, f_a->fs, quality, 0);
/* quality doesn't need to be high for this one. */
quality = 0;
f_a->downsampler_echo = speex_resampler_init(1, f_a->fs, 16000, quality, 0);
if (!f_a->upsampler || !f_a->downsampler || !f_a->downsampler_echo) {
kill_filter_audio(f_a);
return NULL;
}
}
return f_a;
}
void KotiAEC_destory()
{
if(speex_aec_pty.speex_echo_state != NULL && speex_aec_pty.speex_preprocess_state != NULL)
{
speex_echo_state_destroy((SpeexEchoState*)speex_aec_pty.speex_echo_state);
speex_preprocess_state_destroy((SpeexPreprocessState*)speex_aec_pty.speex_preprocess_state);
if(speex_aec_pty.speex_preprocess_state_tmp)
speex_preprocess_state_destroy((SpeexPreprocessState*)speex_aec_pty.speex_preprocess_state_tmp);
if(speex_aec_pty.nosie)
free(speex_aec_pty.nosie);
speex_aec_pty.speex_echo_state = NULL;
speex_aec_pty.speex_preprocess_state = NULL;
speex_aec_pty.speex_preprocess_state_tmp = NULL;
speex_aec_pty.frame_size = 0;
speex_aec_pty.sample_freq = 0;
speex_aec_pty.filter_length = 0;
speex_aec_pty.nosie = NULL;
}
#ifdef WEBRTC_AEC_CORE_ENABLED
if(webrtc_aec_pty.webrtc_aec != NULL)
{
WebRtcAec_Free(webrtc_aec_pty.webrtc_aec);
webrtc_aec_pty.webrtc_aec = NULL;
webrtc_aec_pty.frame_size = 0;
webrtc_aec_pty.sample_freq = 0;
webrtc_aec_pty.sndcard_sample_freq = 0;
if(webrtc_aec_pty.webrtc_ns)
{
WebRtcNsx_Free((NsxHandle*)webrtc_aec_pty.webrtc_ns);
webrtc_aec_pty.webrtc_ns = NULL;
}
if(webrtc_aec_pty.webrtc_agc)
{
WebRtcAgc_Free(webrtc_aec_pty.webrtc_agc);
webrtc_aec_pty.webrtc_agc = NULL;
}
}
if(webrtc_aecm_pty.webrtc_aec != NULL)
{
WebRtcAecm_Free(webrtc_aecm_pty.webrtc_aec);
webrtc_aecm_pty.webrtc_aec = NULL;
webrtc_aecm_pty.frame_size = 0;
webrtc_aecm_pty.sample_freq = 0;
webrtc_aecm_pty.sndcard_sample_freq = 0;
if(webrtc_aecm_pty.webrtc_ns)
{
WebRtcNsx_Free((NsxHandle*)webrtc_aecm_pty.webrtc_ns);
webrtc_aecm_pty.webrtc_ns = NULL;
}
if(webrtc_aecm_pty.webrtc_agc)
{
WebRtcAgc_Free(webrtc_aecm_pty.webrtc_agc);
webrtc_aecm_pty.webrtc_agc = NULL;
}
}
#endif
}