AudioSourceSettingsDefaultResolver.java
/*
* Copyright 2021 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package androidx.camera.video.internal.config;
import android.util.Range;
import androidx.annotation.NonNull;
import androidx.annotation.RequiresApi;
import androidx.camera.core.Logger;
import androidx.camera.video.AudioSpec;
import androidx.camera.video.internal.AudioSource;
import androidx.core.util.Supplier;
/**
* An {@link AudioSource.Settings} supplier that resolves requested source settings from an
* {@link AudioSpec} using pre-defined default values.
*/
@RequiresApi(21) // TODO(b/200306659): Remove and replace with annotation on package-info.java
public final class AudioSourceSettingsDefaultResolver implements Supplier<AudioSource.Settings> {
private static final String TAG = "DefAudioSrcResolver";
private final AudioSpec mAudioSpec;
/**
* Constructor for an AudioSourceSettingsDefaultResolver.
*
* @param audioSpec The {@link AudioSpec} which defines the settings that should be used with
* the audio source.
*/
public AudioSourceSettingsDefaultResolver(@NonNull AudioSpec audioSpec) {
mAudioSpec = audioSpec;
}
@Override
@NonNull
public AudioSource.Settings get() {
// Resolve audio source
int resolvedAudioSource = AudioConfigUtil.resolveAudioSource(mAudioSpec);
// Resolve source format
int resolvedSourceFormat = AudioConfigUtil.resolveAudioSourceFormat(mAudioSpec);
// Resolve channel count
int audioSpecChannelCount = mAudioSpec.getChannelCount();
int resolvedChannelCount;
if (audioSpecChannelCount == AudioSpec.CHANNEL_COUNT_AUTO) {
resolvedChannelCount = AudioConfigUtil.AUDIO_CHANNEL_COUNT_DEFAULT;
Logger.d(TAG, "Using fallback AUDIO channel count: " + resolvedChannelCount);
} else {
resolvedChannelCount = audioSpecChannelCount;
Logger.d(TAG, "Using supplied AUDIO channel count: " + audioSpecChannelCount);
}
// Resolve sample rate
Range<Integer> audioSpecSampleRateRange = mAudioSpec.getSampleRate();
int resolvedSampleRate;
if (AudioSpec.SAMPLE_RATE_RANGE_AUTO.equals(audioSpecSampleRateRange)) {
resolvedSampleRate = AudioConfigUtil.AUDIO_SAMPLE_RATE_DEFAULT;
Logger.d(TAG, "Using fallback AUDIO sample rate: " + resolvedSampleRate + "Hz");
} else {
resolvedSampleRate = AudioConfigUtil.selectSampleRateOrNearestSupported(
audioSpecSampleRateRange,
resolvedChannelCount, resolvedSourceFormat,
audioSpecSampleRateRange.getUpper());
Logger.d(TAG, "Using AUDIO sample rate resolved from AudioSpec: " + resolvedSampleRate
+ "Hz");
}
return AudioSource.Settings.builder()
.setAudioSource(resolvedAudioSource)
.setAudioFormat(resolvedSourceFormat)
.setChannelCount(resolvedChannelCount)
.setSampleRate(resolvedSampleRate)
.build();
}
}