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/*
* Copyright (C) 2011 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.speech.tts;
import android.media.AudioFormat;
import android.media.AudioTrack;
import android.util.Log;
/**
* Speech synthesis request that plays the audio as it is received.
*/
class PlaybackSynthesisRequest extends SynthesisRequest {
private static final String TAG = "PlaybackSynthesisRequest";
private static final boolean DBG = false;
private static final int MIN_AUDIO_BUFFER_SIZE = 8192;
/**
* Audio stream type. Must be one of the STREAM_ contants defined in
* {@link android.media.AudioManager}.
*/
private final int mStreamType;
/**
* Volume, in the range [0.0f, 1.0f]. The default value is
* {@link TextToSpeech.Engine#DEFAULT_VOLUME} (1.0f).
*/
private final float mVolume;
/**
* Left/right position of the audio, in the range [-1.0f, 1.0f].
* The default value is {@link TextToSpeech.Engine#DEFAULT_PAN} (0.0f).
*/
private final float mPan;
private final Object mStateLock = new Object();
private AudioTrack mAudioTrack = null;
private boolean mStopped = false;
PlaybackSynthesisRequest(String text, int streamType, float volume, float pan) {
super(text);
mStreamType = streamType;
mVolume = volume;
mPan = pan;
}
@Override
void stop() {
if (DBG) Log.d(TAG, "stop()");
synchronized (mStateLock) {
mStopped = true;
cleanUp();
}
}
private void cleanUp() {
if (DBG) Log.d(TAG, "cleanUp()");
if (mAudioTrack != null) {
mAudioTrack.flush();
mAudioTrack.stop();
// TODO: do we need to wait for playback to finish before releasing?
mAudioTrack.release();
mAudioTrack = null;
}
}
// TODO: add a thread that writes to the AudioTrack?
@Override
public int start(int sampleRateInHz, int audioFormat, int channelCount) {
if (DBG) {
Log.d(TAG, "start(" + sampleRateInHz + "," + audioFormat
+ "," + channelCount + ")");
}
int channelConfig;
if (channelCount == 1) {
channelConfig = AudioFormat.CHANNEL_OUT_MONO;
} else if (channelCount == 2){
channelConfig = AudioFormat.CHANNEL_OUT_STEREO;
} else {
Log.e(TAG, "Unsupported number of channels: " + channelCount);
return TextToSpeech.ERROR;
}
int minBufferSizeInBytes
= AudioTrack.getMinBufferSize(sampleRateInHz, channelConfig, audioFormat);
int bufferSizeInBytes = Math.max(MIN_AUDIO_BUFFER_SIZE, minBufferSizeInBytes);
synchronized (mStateLock) {
if (mStopped) {
if (DBG) Log.d(TAG, "Request has been aborted.");
return TextToSpeech.ERROR;
}
if (mAudioTrack != null) {
Log.e(TAG, "start() called twice");
cleanUp();
return TextToSpeech.ERROR;
}
mAudioTrack = new AudioTrack(mStreamType, sampleRateInHz, channelConfig, audioFormat,
bufferSizeInBytes, AudioTrack.MODE_STREAM);
if (mAudioTrack.getState() != AudioTrack.STATE_INITIALIZED) {
cleanUp();
return TextToSpeech.ERROR;
}
setupVolume();
}
return TextToSpeech.SUCCESS;
}
private void setupVolume() {
float vol = clip(mVolume, 0.0f, 1.0f);
float panning = clip(mPan, -1.0f, 1.0f);
float volLeft = vol;
float volRight = vol;
if (panning > 0.0f) {
volLeft *= (1.0f - panning);
} else if (panning < 0.0f) {
volRight *= (1.0f + panning);
}
if (DBG) Log.d(TAG, "volLeft=" + volLeft + ",volRight=" + volRight);
if (mAudioTrack.setStereoVolume(volLeft, volRight) != AudioTrack.SUCCESS) {
Log.e(TAG, "Failed to set volume");
}
}
private float clip(float value, float min, float max) {
return value > max ? max : (value < min ? min : value);
}
@Override
public int audioAvailable(byte[] buffer, int offset, int length) {
if (DBG) {
Log.d(TAG, "audioAvailable(byte[" + buffer.length + "],"
+ offset + "," + length + "), thread ID=" + android.os.Process.myTid());
}
synchronized (mStateLock) {
if (mStopped) {
if (DBG) Log.d(TAG, "Request has been aborted.");
return TextToSpeech.ERROR;
}
if (mAudioTrack == null) {
Log.e(TAG, "audioAvailable(): Not started");
return TextToSpeech.ERROR;
}
int playState = mAudioTrack.getPlayState();
if (playState == AudioTrack.PLAYSTATE_STOPPED) {
if (DBG) Log.d(TAG, "AudioTrack stopped, restarting");
mAudioTrack.play();
}
// TODO: loop until all data is written?
if (DBG) Log.d(TAG, "AudioTrack.write()");
int count = mAudioTrack.write(buffer, offset, length);
if (DBG) Log.d(TAG, "AudioTrack.write() returned " + count);
if (count < 0) {
Log.e(TAG, "Writing to AudioTrack failed: " + count);
cleanUp();
return TextToSpeech.ERROR;
} else {
return TextToSpeech.SUCCESS;
}
}
}
@Override
public int done() {
if (DBG) Log.d(TAG, "done()");
synchronized (mStateLock) {
if (mStopped) {
if (DBG) Log.d(TAG, "Request has been aborted.");
return TextToSpeech.ERROR;
}
if (mAudioTrack == null) {
Log.e(TAG, "done(): Not started");
return TextToSpeech.ERROR;
}
cleanUp();
}
return TextToSpeech.SUCCESS;
}
}
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