Androidエミュレーター用のSDCardでmp3ファイルを再生しようとしましたが、奇妙なブーンというノイズだけが出てきます。サンプルレートが 44.1k Hz であることを確認しましたが、他に何が間違っているのかわかりません
if(AudioTrack.MODE_STATIC != mode && AudioTrack.MODE_STREAM != mode)
throw new InvalidParameterException();
String audioFilePath = "/sdcard/test.mp3";
long fileSize = 0;
long bytesWritten = 0;
int bytesRead = 0;
int bufferSize = 0;
byte[] buffer;
AudioTrack track;
File audioFile = new File(audioFilePath);
fileSize = audioFile.length();
if(AudioTrack.MODE_STREAM == mode)
{
bufferSize = 8000;
}
else
{// AudioTrack.MODE_STATIC
bufferSize = (int)fileSize;
}
buffer = new byte[bufferSize];
track = new AudioTrack(AudioManager.STREAM_MUSIC,/* this is for pcm*/ /*22050*/ /*this is for mp3*/ 44100,
AudioFormat.CHANNEL_CONFIGURATION_MONO, AudioFormat.ENCODING_DEFAULT/*AudioFormat.ENCODING_PCM_16BIT*/,
bufferSize, mode);
// in stream mode,
// 1. start track playback
// 2. write data to track
if(AudioTrack.MODE_STREAM == mode)
track.play();
FileInputStream audioStream = null;
try {
audioStream = new FileInputStream(audioFile);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
while(bytesWritten < fileSize)
{
try {
bytesRead = audioStream.read(buffer, 0, bufferSize);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
bytesWritten += track.write(buffer, 0, bytesRead);
}
// in static mode,
// 1. write data to track
// 2. start track playback
if(AudioTrack.MODE_STATIC == mode)
track.play();