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Use low latency mode on Android O and later.

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This CL makes it possible to use a low-latency mode on Android O and later. This should help to reduce the audio latency. The feature is disabled by default and needs to be enabled when creating the audio device module.

Bug: webrtc:12284
Change-Id: Idf41146aa0bc1206e9a2e28e4101d85c3e4eaefc
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/196741
Reviewed-by: Sami Kalliomäki <sakal@webrtc.org>
Reviewed-by: Henrik Andreassson <henrika@webrtc.org>
Commit-Queue: Ivo Creusen <ivoc@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#32854}
This commit is contained in:
Ivo Creusen
2020-12-16 14:28:03 +01:00
committed by Commit Bot
parent 4a541f15dd
commit c25a3a3a1e
6 changed files with 293 additions and 17 deletions
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20
sdk/android/api/org/webrtc/audio/JavaAudioDeviceModule.java
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@ -49,12 +49,14 @@ public class JavaAudioDeviceModule implements AudioDeviceModule {
private boolean useStereoInput;
private boolean useStereoOutput;
private AudioAttributes audioAttributes;
private boolean useLowLatency;
private Builder(Context context) {
this.context = context;
this.audioManager = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);
this.inputSampleRate = WebRtcAudioManager.getSampleRate(audioManager);
this.outputSampleRate = WebRtcAudioManager.getSampleRate(audioManager);
this.useLowLatency = false;
}
public Builder setScheduler(ScheduledExecutorService scheduler) {
@ -195,6 +197,14 @@ public class JavaAudioDeviceModule implements AudioDeviceModule {
return this;
}
/**
* Control if the low-latency mode should be used. The default is disabled.
*/
public Builder setUseLowLatency(boolean useLowLatency) {
this.useLowLatency = useLowLatency;
return this;
}
/**
* Set custom {@link AudioAttributes} to use.
*/
@ -225,6 +235,12 @@ public class JavaAudioDeviceModule implements AudioDeviceModule {
}
Logging.d(TAG, "HW AEC will not be used.");
}
// Low-latency mode was introduced in API version 26, see
// https://developer.android.com/reference/android/media/AudioTrack#PERFORMANCE_MODE_LOW_LATENCY
final int MIN_LOW_LATENCY_SDK_VERSION = 26;
if (useLowLatency && Build.VERSION.SDK_INT >= MIN_LOW_LATENCY_SDK_VERSION) {
Logging.d(TAG, "Low latency mode will be used.");
}
ScheduledExecutorService executor = this.scheduler;
if (executor == null) {
executor = WebRtcAudioRecord.newDefaultScheduler();
@ -232,8 +248,8 @@ public class JavaAudioDeviceModule implements AudioDeviceModule {
final WebRtcAudioRecord audioInput = new WebRtcAudioRecord(context, executor, audioManager,
audioSource, audioFormat, audioRecordErrorCallback, audioRecordStateCallback,
samplesReadyCallback, useHardwareAcousticEchoCanceler, useHardwareNoiseSuppressor);
final WebRtcAudioTrack audioOutput = new WebRtcAudioTrack(
context, audioManager, audioAttributes, audioTrackErrorCallback, audioTrackStateCallback);
final WebRtcAudioTrack audioOutput = new WebRtcAudioTrack(context, audioManager,
audioAttributes, audioTrackErrorCallback, audioTrackStateCallback, useLowLatency);
return new JavaAudioDeviceModule(context, audioManager, audioInput, audioOutput,
inputSampleRate, outputSampleRate, useStereoInput, useStereoOutput);
}