Bjorn Bringert | 50e657b | 2011-03-08 16:00:40 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2011 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); you may not |
| 5 | * use this file except in compliance with the License. You may obtain a copy of |
| 6 | * the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| 12 | * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the |
| 13 | * License for the specific language governing permissions and limitations under |
| 14 | * the License. |
| 15 | */ |
| 16 | package android.speech.tts; |
| 17 | |
| 18 | import android.media.AudioFormat; |
| 19 | import android.media.AudioTrack; |
| 20 | import android.util.Log; |
| 21 | |
| 22 | /** |
| 23 | * Speech synthesis request that plays the audio as it is received. |
| 24 | */ |
| 25 | class PlaybackSynthesisRequest extends SynthesisRequest { |
| 26 | |
| 27 | private static final String TAG = "PlaybackSynthesisRequest"; |
| 28 | private static final boolean DBG = false; |
| 29 | |
| 30 | private static final int MIN_AUDIO_BUFFER_SIZE = 8192; |
| 31 | |
| 32 | /** |
| 33 | * Audio stream type. Must be one of the STREAM_ contants defined in |
| 34 | * {@link android.media.AudioManager}. |
| 35 | */ |
| 36 | private final int mStreamType; |
| 37 | |
| 38 | /** |
| 39 | * Volume, in the range [0.0f, 1.0f]. The default value is |
| 40 | * {@link TextToSpeech.Engine#DEFAULT_VOLUME} (1.0f). |
| 41 | */ |
| 42 | private final float mVolume; |
| 43 | |
| 44 | /** |
| 45 | * Left/right position of the audio, in the range [-1.0f, 1.0f]. |
| 46 | * The default value is {@link TextToSpeech.Engine#DEFAULT_PAN} (0.0f). |
| 47 | */ |
| 48 | private final float mPan; |
| 49 | |
| 50 | private final Object mStateLock = new Object(); |
| 51 | private AudioTrack mAudioTrack = null; |
| 52 | private boolean mStopped = false; |
Bjorn Bringert | 360eb16 | 2011-04-19 09:20:35 +0100 | [diff] [blame] | 53 | private boolean mDone = false; |
Bjorn Bringert | 50e657b | 2011-03-08 16:00:40 +0000 | [diff] [blame] | 54 | |
| 55 | PlaybackSynthesisRequest(String text, int streamType, float volume, float pan) { |
| 56 | super(text); |
| 57 | mStreamType = streamType; |
| 58 | mVolume = volume; |
| 59 | mPan = pan; |
| 60 | } |
| 61 | |
| 62 | @Override |
| 63 | void stop() { |
| 64 | if (DBG) Log.d(TAG, "stop()"); |
| 65 | synchronized (mStateLock) { |
| 66 | mStopped = true; |
| 67 | cleanUp(); |
| 68 | } |
| 69 | } |
| 70 | |
| 71 | private void cleanUp() { |
| 72 | if (DBG) Log.d(TAG, "cleanUp()"); |
| 73 | if (mAudioTrack != null) { |
| 74 | mAudioTrack.flush(); |
| 75 | mAudioTrack.stop(); |
Bjorn Bringert | 50e657b | 2011-03-08 16:00:40 +0000 | [diff] [blame] | 76 | mAudioTrack.release(); |
| 77 | mAudioTrack = null; |
| 78 | } |
| 79 | } |
| 80 | |
Bjorn Bringert | 71e0b48 | 2011-04-15 14:37:05 +0100 | [diff] [blame] | 81 | @Override |
| 82 | public int getMaxBufferSize() { |
| 83 | // The AudioTrack buffer will be at least MIN_AUDIO_BUFFER_SIZE, so that should always be |
| 84 | // a safe buffer size to pass in. |
| 85 | return MIN_AUDIO_BUFFER_SIZE; |
| 86 | } |
| 87 | |
Bjorn Bringert | 360eb16 | 2011-04-19 09:20:35 +0100 | [diff] [blame] | 88 | @Override |
| 89 | boolean isDone() { |
| 90 | return mDone; |
| 91 | } |
| 92 | |
Bjorn Bringert | 50e657b | 2011-03-08 16:00:40 +0000 | [diff] [blame] | 93 | // TODO: add a thread that writes to the AudioTrack? |
| 94 | @Override |
| 95 | public int start(int sampleRateInHz, int audioFormat, int channelCount) { |
| 96 | if (DBG) { |
| 97 | Log.d(TAG, "start(" + sampleRateInHz + "," + audioFormat |
| 98 | + "," + channelCount + ")"); |
| 99 | } |
| 100 | |
Bjorn Bringert | 50e657b | 2011-03-08 16:00:40 +0000 | [diff] [blame] | 101 | synchronized (mStateLock) { |
| 102 | if (mStopped) { |
| 103 | if (DBG) Log.d(TAG, "Request has been aborted."); |
| 104 | return TextToSpeech.ERROR; |
| 105 | } |
| 106 | if (mAudioTrack != null) { |
| 107 | Log.e(TAG, "start() called twice"); |
| 108 | cleanUp(); |
| 109 | return TextToSpeech.ERROR; |
| 110 | } |
| 111 | |
Narayan Kamath | 53f6f95 | 2011-04-19 16:39:20 +0100 | [diff] [blame] | 112 | mAudioTrack = createStreamingAudioTrack(sampleRateInHz, audioFormat, channelCount); |
Bjorn Bringert | 71e0b48 | 2011-04-15 14:37:05 +0100 | [diff] [blame] | 113 | if (mAudioTrack == null) { |
Bjorn Bringert | 50e657b | 2011-03-08 16:00:40 +0000 | [diff] [blame] | 114 | return TextToSpeech.ERROR; |
| 115 | } |
Bjorn Bringert | 50e657b | 2011-03-08 16:00:40 +0000 | [diff] [blame] | 116 | } |
| 117 | |
| 118 | return TextToSpeech.SUCCESS; |
| 119 | } |
| 120 | |
Bjorn Bringert | 71e0b48 | 2011-04-15 14:37:05 +0100 | [diff] [blame] | 121 | private void setupVolume(AudioTrack audioTrack, float volume, float pan) { |
| 122 | float vol = clip(volume, 0.0f, 1.0f); |
| 123 | float panning = clip(pan, -1.0f, 1.0f); |
Bjorn Bringert | 50e657b | 2011-03-08 16:00:40 +0000 | [diff] [blame] | 124 | float volLeft = vol; |
| 125 | float volRight = vol; |
| 126 | if (panning > 0.0f) { |
| 127 | volLeft *= (1.0f - panning); |
| 128 | } else if (panning < 0.0f) { |
| 129 | volRight *= (1.0f + panning); |
| 130 | } |
| 131 | if (DBG) Log.d(TAG, "volLeft=" + volLeft + ",volRight=" + volRight); |
Bjorn Bringert | 71e0b48 | 2011-04-15 14:37:05 +0100 | [diff] [blame] | 132 | if (audioTrack.setStereoVolume(volLeft, volRight) != AudioTrack.SUCCESS) { |
Bjorn Bringert | 50e657b | 2011-03-08 16:00:40 +0000 | [diff] [blame] | 133 | Log.e(TAG, "Failed to set volume"); |
| 134 | } |
| 135 | } |
| 136 | |
| 137 | private float clip(float value, float min, float max) { |
| 138 | return value > max ? max : (value < min ? min : value); |
| 139 | } |
| 140 | |
| 141 | @Override |
| 142 | public int audioAvailable(byte[] buffer, int offset, int length) { |
| 143 | if (DBG) { |
| 144 | Log.d(TAG, "audioAvailable(byte[" + buffer.length + "]," |
Bjorn Bringert | 71e0b48 | 2011-04-15 14:37:05 +0100 | [diff] [blame] | 145 | + offset + "," + length + ")"); |
| 146 | } |
| 147 | if (length > getMaxBufferSize()) { |
| 148 | throw new IllegalArgumentException("buffer is too large (" + length + " bytes)"); |
Bjorn Bringert | 50e657b | 2011-03-08 16:00:40 +0000 | [diff] [blame] | 149 | } |
| 150 | synchronized (mStateLock) { |
| 151 | if (mStopped) { |
| 152 | if (DBG) Log.d(TAG, "Request has been aborted."); |
| 153 | return TextToSpeech.ERROR; |
| 154 | } |
| 155 | if (mAudioTrack == null) { |
| 156 | Log.e(TAG, "audioAvailable(): Not started"); |
| 157 | return TextToSpeech.ERROR; |
| 158 | } |
| 159 | int playState = mAudioTrack.getPlayState(); |
| 160 | if (playState == AudioTrack.PLAYSTATE_STOPPED) { |
| 161 | if (DBG) Log.d(TAG, "AudioTrack stopped, restarting"); |
| 162 | mAudioTrack.play(); |
| 163 | } |
| 164 | // TODO: loop until all data is written? |
| 165 | if (DBG) Log.d(TAG, "AudioTrack.write()"); |
| 166 | int count = mAudioTrack.write(buffer, offset, length); |
| 167 | if (DBG) Log.d(TAG, "AudioTrack.write() returned " + count); |
| 168 | if (count < 0) { |
| 169 | Log.e(TAG, "Writing to AudioTrack failed: " + count); |
| 170 | cleanUp(); |
| 171 | return TextToSpeech.ERROR; |
| 172 | } else { |
| 173 | return TextToSpeech.SUCCESS; |
| 174 | } |
| 175 | } |
| 176 | } |
| 177 | |
| 178 | @Override |
| 179 | public int done() { |
| 180 | if (DBG) Log.d(TAG, "done()"); |
| 181 | synchronized (mStateLock) { |
| 182 | if (mStopped) { |
| 183 | if (DBG) Log.d(TAG, "Request has been aborted."); |
| 184 | return TextToSpeech.ERROR; |
| 185 | } |
| 186 | if (mAudioTrack == null) { |
| 187 | Log.e(TAG, "done(): Not started"); |
| 188 | return TextToSpeech.ERROR; |
| 189 | } |
Bjorn Bringert | 360eb16 | 2011-04-19 09:20:35 +0100 | [diff] [blame] | 190 | mDone = true; |
Bjorn Bringert | 50e657b | 2011-03-08 16:00:40 +0000 | [diff] [blame] | 191 | cleanUp(); |
| 192 | } |
| 193 | return TextToSpeech.SUCCESS; |
| 194 | } |
Bjorn Bringert | 71e0b48 | 2011-04-15 14:37:05 +0100 | [diff] [blame] | 195 | |
| 196 | @Override |
Bjorn Bringert | 360eb16 | 2011-04-19 09:20:35 +0100 | [diff] [blame] | 197 | public void error() { |
| 198 | if (DBG) Log.d(TAG, "error()"); |
| 199 | synchronized (mStateLock) { |
| 200 | cleanUp(); |
| 201 | } |
| 202 | } |
| 203 | |
| 204 | @Override |
Bjorn Bringert | 71e0b48 | 2011-04-15 14:37:05 +0100 | [diff] [blame] | 205 | public int completeAudioAvailable(int sampleRateInHz, int audioFormat, int channelCount, |
| 206 | byte[] buffer, int offset, int length) { |
| 207 | if (DBG) { |
| 208 | Log.d(TAG, "completeAudioAvailable(" + sampleRateInHz + "," + audioFormat |
| 209 | + "," + channelCount + "byte[" + buffer.length + "]," |
| 210 | + offset + "," + length + ")"); |
| 211 | } |
| 212 | |
| 213 | synchronized (mStateLock) { |
| 214 | if (mStopped) { |
| 215 | if (DBG) Log.d(TAG, "Request has been aborted."); |
| 216 | return TextToSpeech.ERROR; |
| 217 | } |
| 218 | if (mAudioTrack != null) { |
| 219 | Log.e(TAG, "start() called before completeAudioAvailable()"); |
| 220 | cleanUp(); |
| 221 | return TextToSpeech.ERROR; |
| 222 | } |
| 223 | |
Narayan Kamath | 53f6f95 | 2011-04-19 16:39:20 +0100 | [diff] [blame] | 224 | int channelConfig = getChannelConfig(channelCount); |
| 225 | if (channelConfig < 0) { |
| 226 | Log.e(TAG, "Unsupported number of channels :" + channelCount); |
| 227 | cleanUp(); |
| 228 | return TextToSpeech.ERROR; |
| 229 | } |
| 230 | int bytesPerFrame = getBytesPerFrame(audioFormat); |
| 231 | if (bytesPerFrame < 0) { |
| 232 | Log.e(TAG, "Unsupported audio format :" + audioFormat); |
| 233 | cleanUp(); |
| 234 | return TextToSpeech.ERROR; |
| 235 | } |
| 236 | |
| 237 | mAudioTrack = new AudioTrack(mStreamType, sampleRateInHz, channelConfig, |
| 238 | audioFormat, buffer.length, AudioTrack.MODE_STATIC); |
Bjorn Bringert | 71e0b48 | 2011-04-15 14:37:05 +0100 | [diff] [blame] | 239 | if (mAudioTrack == null) { |
| 240 | return TextToSpeech.ERROR; |
| 241 | } |
| 242 | |
| 243 | try { |
| 244 | mAudioTrack.write(buffer, offset, length); |
Narayan Kamath | 53f6f95 | 2011-04-19 16:39:20 +0100 | [diff] [blame] | 245 | setupVolume(mAudioTrack, mVolume, mPan); |
Bjorn Bringert | 71e0b48 | 2011-04-15 14:37:05 +0100 | [diff] [blame] | 246 | mAudioTrack.play(); |
Narayan Kamath | 53f6f95 | 2011-04-19 16:39:20 +0100 | [diff] [blame] | 247 | blockUntilDone(mAudioTrack, bytesPerFrame, length); |
Bjorn Bringert | 360eb16 | 2011-04-19 09:20:35 +0100 | [diff] [blame] | 248 | mDone = true; |
Narayan Kamath | 53f6f95 | 2011-04-19 16:39:20 +0100 | [diff] [blame] | 249 | if (DBG) Log.d(TAG, "Wrote data to audio track succesfully : " + length); |
Bjorn Bringert | 71e0b48 | 2011-04-15 14:37:05 +0100 | [diff] [blame] | 250 | } catch (IllegalStateException ex) { |
| 251 | Log.e(TAG, "Playback error", ex); |
| 252 | return TextToSpeech.ERROR; |
| 253 | } finally { |
| 254 | cleanUp(); |
| 255 | } |
| 256 | } |
| 257 | |
| 258 | return TextToSpeech.SUCCESS; |
| 259 | } |
| 260 | |
Narayan Kamath | 53f6f95 | 2011-04-19 16:39:20 +0100 | [diff] [blame] | 261 | private void blockUntilDone(AudioTrack audioTrack, int bytesPerFrame, int length) { |
| 262 | int lengthInFrames = length / bytesPerFrame; |
| 263 | int currentPosition = 0; |
| 264 | while ((currentPosition = audioTrack.getPlaybackHeadPosition()) < lengthInFrames) { |
| 265 | long estimatedTimeMs = ((lengthInFrames - currentPosition) * 1000) / |
| 266 | audioTrack.getSampleRate(); |
| 267 | if (DBG) Log.d(TAG, "About to sleep for : " + estimatedTimeMs + " ms," + |
| 268 | " Playback position : " + currentPosition); |
| 269 | try { |
| 270 | Thread.sleep(estimatedTimeMs); |
| 271 | } catch (InterruptedException ie) { |
| 272 | break; |
| 273 | } |
| 274 | } |
| 275 | } |
| 276 | |
| 277 | private int getBytesPerFrame(int audioFormat) { |
| 278 | if (audioFormat == AudioFormat.ENCODING_PCM_8BIT) { |
| 279 | return 1; |
| 280 | } else if (audioFormat == AudioFormat.ENCODING_PCM_16BIT) { |
| 281 | return 2; |
| 282 | } |
| 283 | |
| 284 | return -1; |
| 285 | } |
| 286 | |
| 287 | private int getChannelConfig(int channelCount) { |
Bjorn Bringert | 71e0b48 | 2011-04-15 14:37:05 +0100 | [diff] [blame] | 288 | if (channelCount == 1) { |
Narayan Kamath | 53f6f95 | 2011-04-19 16:39:20 +0100 | [diff] [blame] | 289 | return AudioFormat.CHANNEL_OUT_MONO; |
Bjorn Bringert | 71e0b48 | 2011-04-15 14:37:05 +0100 | [diff] [blame] | 290 | } else if (channelCount == 2){ |
Narayan Kamath | 53f6f95 | 2011-04-19 16:39:20 +0100 | [diff] [blame] | 291 | return AudioFormat.CHANNEL_OUT_STEREO; |
| 292 | } |
| 293 | |
| 294 | return -1; |
| 295 | } |
| 296 | |
| 297 | private AudioTrack createStreamingAudioTrack(int sampleRateInHz, int audioFormat, |
| 298 | int channelCount) { |
| 299 | int channelConfig = getChannelConfig(channelCount); |
| 300 | |
| 301 | if (channelConfig < 0) { |
| 302 | Log.e(TAG, "Unsupported number of channels : " + channelCount); |
Bjorn Bringert | 71e0b48 | 2011-04-15 14:37:05 +0100 | [diff] [blame] | 303 | return null; |
| 304 | } |
| 305 | |
| 306 | int minBufferSizeInBytes |
| 307 | = AudioTrack.getMinBufferSize(sampleRateInHz, channelConfig, audioFormat); |
| 308 | int bufferSizeInBytes = Math.max(MIN_AUDIO_BUFFER_SIZE, minBufferSizeInBytes); |
| 309 | AudioTrack audioTrack = new AudioTrack(mStreamType, sampleRateInHz, channelConfig, |
Narayan Kamath | 53f6f95 | 2011-04-19 16:39:20 +0100 | [diff] [blame] | 310 | audioFormat, bufferSizeInBytes, AudioTrack.MODE_STREAM); |
Bjorn Bringert | 71e0b48 | 2011-04-15 14:37:05 +0100 | [diff] [blame] | 311 | if (audioTrack == null) { |
| 312 | return null; |
| 313 | } |
Narayan Kamath | 53f6f95 | 2011-04-19 16:39:20 +0100 | [diff] [blame] | 314 | |
Bjorn Bringert | 71e0b48 | 2011-04-15 14:37:05 +0100 | [diff] [blame] | 315 | if (audioTrack.getState() != AudioTrack.STATE_INITIALIZED) { |
| 316 | audioTrack.release(); |
| 317 | return null; |
| 318 | } |
| 319 | setupVolume(audioTrack, mVolume, mPan); |
| 320 | return audioTrack; |
| 321 | } |
Narayan Kamath | 53f6f95 | 2011-04-19 16:39:20 +0100 | [diff] [blame] | 322 | } |