public AudioSample getAudioSample(String filename, int bufferSize) {
AudioInputStream ais = getAudioInputStream(filename);
if (ais != null) {
AudioMetaData meta = null;
AudioFormat format = ais.getFormat();
FloatSampleBuffer samples = null;
if (format instanceof MpegAudioFormat) {
AudioFormat baseFormat = format;
format =
new AudioFormat(
AudioFormat.Encoding.PCM_SIGNED,
baseFormat.getSampleRate(),
16,
baseFormat.getChannels(),
baseFormat.getChannels() * 2,
baseFormat.getSampleRate(),
false);
// converts the stream to PCM audio from mp3 audio
ais = getAudioInputStream(format, ais);
// get a map of properties so we can find out how long it is
Map<String, Object> props = getID3Tags(filename);
// there is a property called mp3.length.bytes, but that is
// the length in bytes of the mp3 file, which will of course
// be much shorter than the decoded version. so we use the
// duration of the file to figure out how many bytes the
// decoded file will be.
long dur = ((Long) props.get("duration")).longValue();
int toRead = (int) AudioUtils.millis2Bytes(dur / 1000, format);
samples = loadFloatAudio(ais, toRead);
meta = new MP3MetaData(filename, dur / 1000, props);
} else {
samples = loadFloatAudio(ais, (int) ais.getFrameLength() * format.getFrameSize());
long length = AudioUtils.frames2Millis(samples.getSampleCount(), format);
meta = new BasicMetaData(filename, length);
}
AudioSynthesizer out =
getAudioSynthesizer(
format.getChannels(),
bufferSize,
format.getSampleRate(),
format.getSampleSizeInBits());
if (out != null) {
SampleSignal ssig = new SampleSignal(samples);
out.setAudioSignal(ssig);
return new JSAudioSample(meta, ssig, out);
} else {
error("Couldn't acquire an output.");
}
}
return null;
}
private JSAudioSample getAudioSampleImp(
FloatSampleBuffer samples, AudioFormat format, int bufferSize) {
AudioSynthesizer out =
getAudioSynthesizer(
samples.getChannelCount(),
bufferSize,
format.getSampleRate(),
format.getSampleSizeInBits());
if (out != null) {
SampleSignal ssig = new SampleSignal(samples);
out.setAudioSignal(ssig);
long length = AudioUtils.frames2Millis(samples.getSampleCount(), format);
BasicMetaData meta = new BasicMetaData(samples.toString(), length);
return new JSAudioSample(meta, ssig, out);
} else {
error("Couldn't acquire an output.");
}
return null;
}
