private void releaseResources() {
if (outputStream != null) {
try {
outputStream.close();
} catch (IOException e) {
e.printStackTrace();
} finally {
outputStream = null;
}
}
if (tracks != null) {
for (Track track : tracks) {
try {
track.release();
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
@Override
protected Exception doInBackground(Track... tracks) {
Thread.currentThread().setPriority(Thread.MAX_PRIORITY - 1);
try {
this.tracks = tracks;
for (Track track : tracks) {
track.startStream();
if (sampleMode) {
track.addOffsetFrame(-skipFrame);
}
}
outputStream = new VorbisFileOutputStream(outputFileName);
int read = 0;
int totalRead = 0;
int durationInMilli = (int) tracks[0].getDuration();
int durationInSec = durationInMilli / 1000;
int estimateLength = durationInSec * PcmPlayer.SAMPLERATE * PcmPlayer.CHANNELS;
int estimateLengthInPercent = estimateLength / 100;
int preProgressInPercent = 0;
int currentProgressInPercent = 0;
short[] pcm = new short[BUFFER_SIZE];
int fadeInThreshold = pcm.length * FADE_IN_AND_OUT_DISCRETE_DIVIDER;
int fadeOutThreshold = SAMPLE_LENGTH - pcm.length * FADE_IN_AND_OUT_DISCRETE_DIVIDER;
float volume = 0;
float volumeChangeAmount = 1f / FADE_IN_AND_OUT_DISCRETE_DIVIDER;
while (!interrupted && read != -1) {
Arrays.fill(pcm, (short) 0);
for (Track track : tracks) {
read = track.read(pcm);
if (read == -1) {
break;
}
}
if (sampleMode) {
if (totalRead > SAMPLE_LENGTH) {
break;
}
if (totalRead < fadeInThreshold && volume < 1) {
for (int i = 0; i < read; i++) {
pcm[i] *= volume;
}
volume += volumeChangeAmount;
}
if (totalRead > fadeOutThreshold && volume > 0) {
for (int i = 0; i < read; i++) {
pcm[i] *= volume;
}
volume -= volumeChangeAmount;
}
}
outputStream.write(pcm, 0, read);
totalRead += read;
currentProgressInPercent = Math.round(totalRead / estimateLengthInPercent);
if (currentProgressInPercent > preProgressInPercent) {
preProgressInPercent = currentProgressInPercent;
publishProgress(currentProgressInPercent);
}
}
return null;
} catch (Exception e) {
return e;
}
}