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echo-cancel: Start capture at a sane volume if we're doing webrtc AGC

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This is required to make sure the capture output has sufficient energy
for the AGC to do its job.
This commit is contained in:
Arun Raghavan 2016-02-17 19:47:02 +05:30
parent a84d65d748
commit 19fb2481ea
2 changed files with 14 additions and 1 deletions
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1
src/modules/echo-cancel/echo-cancel.h
View file

@ -68,6 +68,7 @@ struct pa_echo_canceller_params {
pa_sample_spec sample_spec;
void *trace_callback;
bool agc;
bool first;
} webrtc;
#endif
/* each canceller-specific structure goes here */

12
src/modules/echo-cancel/webrtc.cc
View file

@ -52,6 +52,7 @@ PA_C_DECL_END
#define DEFAULT_TRACE false
#define WEBRTC_AGC_MAX_VOLUME 255
#define WEBRTC_AGC_START_VOLUME 85
static const char* const valid_modargs[] = {
"high_pass_filter",
@ -299,6 +300,7 @@ bool pa_webrtc_ec_init(pa_core *c, pa_echo_canceller *ec,
ec->params.priv.webrtc.sample_spec = *out_ss;
ec->params.priv.webrtc.blocksize = (uint64_t)pa_bytes_per_second(out_ss) * BLOCK_SIZE_US / PA_USEC_PER_SEC;
*nframes = ec->params.priv.webrtc.blocksize / pa_frame_size(out_ss);
ec->params.priv.webrtc.first = true;
pa_modargs_free(ma);
return true;
@ -363,7 +365,17 @@ void pa_webrtc_ec_record(pa_echo_canceller *ec, const uint8_t *rec, uint8_t *out
apm->ProcessStream(&out_frame);
if (ec->params.priv.webrtc.agc) {
if (PA_UNLIKELY(ec->params.priv.webrtc.first)) {
/* We start at a sane default volume (taken from the Chromium
* condition on the experimental AGC in audio_processing.h). This is
* needed to make sure that there's enough energy in the capture
* signal for the AGC to work */
ec->params.priv.webrtc.first = false;
new_volume = WEBRTC_AGC_START_VOLUME;
} else {
new_volume = apm->gain_control()->stream_analog_level();
}
if (old_volume != new_volume) {
pa_cvolume_set(&v, ss->channels, webrtc_volume_to_pa(new_volume));
pa_echo_canceller_set_capture_volume(ec, &v);