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Expose APM pipeline parameter to select downmixing method

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Bug: b/257289030
Change-Id: I03a666a15752d7a1125af2f8d3edae530493618c
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/285473
Reviewed-by: Jesus de Vicente Pena <devicentepena@webrtc.org>
Commit-Queue: Alessio Bazzica <alessiob@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#38789}
This commit is contained in:
Alessio Bazzica
2022-12-01 13:26:26 +01:00
committed by WebRTC LUCI CQ
parent 8754a3c945
commit 504bd59422
2 changed files with 29 additions and 1 deletions
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21
modules/audio_processing/audio_processing_impl.cc
View File

@ -442,6 +442,19 @@ const AudioProcessing::Config AdjustConfig(
return adjusted_config;
}
using DownmixMethod = AudioProcessing::Config::Pipeline::DownmixMethod;
void SetDownmixMethod(AudioBuffer& buffer, DownmixMethod method) {
switch (method) {
case DownmixMethod::kAverageChannels:
buffer.set_downmixing_by_averaging();
break;
case DownmixMethod::kUseFirstChannel:
buffer.set_downmixing_to_specific_channel(/*channel=*/0);
break;
}
}
constexpr int kUnspecifiedDataDumpInputVolume = -100;
} // namespace
@ -689,6 +702,8 @@ void AudioProcessingImpl::InitializeLocked() {
formats_.api_format.output_stream().num_channels(),
formats_.api_format.output_stream().sample_rate_hz(),
formats_.api_format.output_stream().num_channels()));
SetDownmixMethod(*capture_.capture_audio,
config_.pipeline.capture_downmix_method);
if (capture_nonlocked_.capture_processing_format.sample_rate_hz() <
formats_.api_format.output_stream().sample_rate_hz() &&
@ -700,6 +715,8 @@ void AudioProcessingImpl::InitializeLocked() {
formats_.api_format.output_stream().num_channels(),
formats_.api_format.output_stream().sample_rate_hz(),
formats_.api_format.output_stream().num_channels()));
SetDownmixMethod(*capture_.capture_fullband_audio,
config_.pipeline.capture_downmix_method);
} else {
capture_.capture_fullband_audio.reset();
}
@ -821,7 +838,9 @@ void AudioProcessingImpl::ApplyConfig(const AudioProcessing::Config& config) {
config_.pipeline.multi_channel_capture !=
adjusted_config.pipeline.multi_channel_capture ||
config_.pipeline.maximum_internal_processing_rate !=
adjusted_config.pipeline.maximum_internal_processing_rate;
adjusted_config.pipeline.maximum_internal_processing_rate ||
config_.pipeline.capture_downmix_method !=
adjusted_config.pipeline.capture_downmix_method;
const bool aec_config_changed =
config_.echo_canceller.enabled !=

9
modules/audio_processing/include/audio_processing.h
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@ -146,6 +146,12 @@ class RTC_EXPORT AudioProcessing : public rtc::RefCountInterface {
struct RTC_EXPORT Config {
// Sets the properties of the audio processing pipeline.
struct RTC_EXPORT Pipeline {
// Ways to downmix a multi-channel track to mono.
enum class DownmixMethod {
kAverageChannels, // Average across channels.
kUseFirstChannel // Use the first channel.
};
// Maximum allowed processing rate used internally. May only be set to
// 32000 or 48000 and any differing values will be treated as 48000.
int maximum_internal_processing_rate = 48000;
@ -154,6 +160,9 @@ class RTC_EXPORT AudioProcessing : public rtc::RefCountInterface {
// Allow multi-channel processing of capture audio when AEC3 is active
// or a custom AEC is injected..
bool multi_channel_capture = false;
// Indicates how to downmix multi-channel capture audio to mono (when
// needed).
DownmixMethod capture_downmix_method = DownmixMethod::kAverageChannels;
} pipeline;
// Enabled the pre-amplifier. It amplifies the capture signal