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/*
* Copyright (C) 2022 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 android.companion.virtual.audio;
import static android.media.AudioTrack.PLAYSTATE_PLAYING;
import static android.media.AudioTrack.PLAYSTATE_STOPPED;
import static android.media.AudioTrack.STATE_INITIALIZED;
import static android.media.AudioTrack.WRITE_BLOCKING;
import android.annotation.NonNull;
import android.annotation.Nullable;
import android.annotation.SuppressLint;
import android.annotation.SystemApi;
import android.media.AudioFormat;
import android.media.AudioTrack;
import android.util.Log;
import com.android.internal.annotations.GuardedBy;
import java.nio.ByteBuffer;
/**
* Wrapper around {@link AudioTrack} that allows for the underlying {@link AudioTrack} to
* be swapped out while playout is ongoing.
*
* @hide
*/
// The stop() actually doesn't release resources, so should not force implementing Closeable.
@SuppressLint("NotCloseable")
@SystemApi
public final class AudioInjection {
private static final String TAG = "AudioInjection";
private final AudioFormat mAudioFormat;
private final Object mLock = new Object();
@GuardedBy("mLock")
@Nullable
private AudioTrack mAudioTrack;
@GuardedBy("mLock")
private int mPlayState = PLAYSTATE_STOPPED;
@GuardedBy("mLock")
private boolean mIsSilent;
/** Sets if the injected microphone sound is silent. */
void setSilent(boolean isSilent) {
synchronized (mLock) {
mIsSilent = isSilent;
}
}
/**
* Sets the {@link AudioTrack} to handle audio injection.
* Callers may call this multiple times with different audio tracks to change
* the underlying {@link AudioTrack} without stopping and re-starting injection.
*
* @param audioTrack The underlying {@link AudioTrack} to use for injection,
* or null if no audio (i.e. silence) should be injected while still keeping the
* record in a playing state.
*/
void setAudioTrack(@Nullable AudioTrack audioTrack) {
Log.d(TAG, "set AudioTrack with " + audioTrack);
synchronized (mLock) {
// Sync play state for new reference.
if (audioTrack != null) {
if (audioTrack.getState() != STATE_INITIALIZED) {
throw new IllegalStateException("set an uninitialized AudioTrack.");
}
if (mPlayState == PLAYSTATE_PLAYING
&& audioTrack.getPlayState() != PLAYSTATE_PLAYING) {
audioTrack.play();
}
if (mPlayState == PLAYSTATE_STOPPED
&& audioTrack.getPlayState() != PLAYSTATE_STOPPED) {
audioTrack.stop();
}
}
// Release old reference before assigning the new reference.
if (mAudioTrack != null) {
mAudioTrack.release();
}
mAudioTrack = audioTrack;
}
}
AudioInjection(@NonNull AudioFormat audioFormat) {
mAudioFormat = audioFormat;
}
void close() {
synchronized (mLock) {
if (mAudioTrack != null) {
mAudioTrack.release();
mAudioTrack = null;
}
}
}
/** See {@link AudioTrack#getFormat()}. */
public @NonNull AudioFormat getFormat() {
return mAudioFormat;
}
/** See {@link AudioTrack#write(byte[], int, int)}. */
public int write(@NonNull byte[] audioData, int offsetInBytes, int sizeInBytes) {
return write(audioData, offsetInBytes, sizeInBytes, WRITE_BLOCKING);
}
/** See {@link AudioTrack#write(byte[], int, int, int)}. */
public int write(@NonNull byte[] audioData, int offsetInBytes, int sizeInBytes,
@AudioTrack.WriteMode int writeMode) {
final int sizeWrite;
synchronized (mLock) {
if (mAudioTrack != null && !mIsSilent) {
sizeWrite = mAudioTrack.write(audioData, offsetInBytes, sizeInBytes, writeMode);
} else {
sizeWrite = 0;
}
}
return sizeWrite;
}
/** See {@link AudioTrack#write(ByteBuffer, int, int)}. */
public int write(@NonNull ByteBuffer audioBuffer, int sizeInBytes, int writeMode) {
final int sizeWrite;
synchronized (mLock) {
if (mAudioTrack != null && !mIsSilent) {
sizeWrite = mAudioTrack.write(audioBuffer, sizeInBytes, writeMode);
} else {
sizeWrite = 0;
}
}
return sizeWrite;
}
/** See {@link AudioTrack#write(ByteBuffer, int, int, long)}. */
public int write(@NonNull ByteBuffer audioBuffer, int sizeInBytes,
@AudioTrack.WriteMode int writeMode, long timestamp) {
final int sizeWrite;
synchronized (mLock) {
if (mAudioTrack != null && !mIsSilent) {
sizeWrite = mAudioTrack.write(audioBuffer, sizeInBytes, writeMode, timestamp);
} else {
sizeWrite = 0;
}
}
return sizeWrite;
}
/** See {@link AudioTrack#write(float[], int, int, int)}. */
public int write(@NonNull float[] audioData, int offsetInFloats, int sizeInFloats,
@AudioTrack.WriteMode int writeMode) {
final int sizeWrite;
synchronized (mLock) {
if (mAudioTrack != null && !mIsSilent) {
sizeWrite = mAudioTrack.write(audioData, offsetInFloats, sizeInFloats, writeMode);
} else {
sizeWrite = 0;
}
}
return sizeWrite;
}
/** See {@link AudioTrack#write(short[], int, int)}. */
public int write(@NonNull short[] audioData, int offsetInShorts, int sizeInShorts) {
return write(audioData, offsetInShorts, sizeInShorts, WRITE_BLOCKING);
}
/** See {@link AudioTrack#write(short[], int, int, int)}. */
public int write(@NonNull short[] audioData, int offsetInShorts, int sizeInShorts,
@AudioTrack.WriteMode int writeMode) {
final int sizeWrite;
synchronized (mLock) {
if (mAudioTrack != null && !mIsSilent) {
sizeWrite = mAudioTrack.write(audioData, offsetInShorts, sizeInShorts, writeMode);
} else {
sizeWrite = 0;
}
}
return sizeWrite;
}
/** See {@link AudioTrack#play()}. */
public void play() {
synchronized (mLock) {
mPlayState = PLAYSTATE_PLAYING;
if (mAudioTrack != null && mAudioTrack.getPlayState() != PLAYSTATE_PLAYING) {
mAudioTrack.play();
}
}
}
/** See {@link AudioTrack#stop()}. */
public void stop() {
synchronized (mLock) {
mPlayState = PLAYSTATE_STOPPED;
if (mAudioTrack != null && mAudioTrack.getPlayState() != PLAYSTATE_STOPPED) {
mAudioTrack.stop();
}
}
}
/** See {@link AudioTrack#getPlayState()}. */
public int getPlayState() {
synchronized (mLock) {
return mPlayState;
}
}
}
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