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在我的項目中，我使用mediaplayer錄製了聲音並保存爲.3gp文件，但是當我想在播放時使用某些音頻效果或快進或播放音頻音調時播放它。我已經使用mediaplayer但不工作。然後我使用audiotrack，但audiotrack只需要bytestream作爲輸入播放。我只想播放.3gp文件並在播放時更改音調。我在下面使用這一個。 幫我...在此先感謝...在播放時更改.3gp文件的音高
public void play() {
File path = new File(
Environment.getExternalStorageDirectory().getAbsolutePath()
+ "/sdcard/meditest/");
File[] f=path.listFiles();
isPlaying=true;
int bufferSize = AudioTrack.getMinBufferSize(outfrequency,
channelConfigurationout, audioEncoding);
short[] audiodata = new short[bufferSize];
try {
DataInputStream dis = new DataInputStream(
new BufferedInputStream(new FileInputStream(
f[0])));
audioTrack = new AudioTrack(
AudioManager.STREAM_MUSIC, outfrequency,
channelConfigurationout, audioEncoding, bufferSize,
AudioTrack.MODE_STREAM);
audioTrack.setPlaybackRate((int) (frequency*1.5));
AudioManager audioManager = (AudioManager)this.getSystemService(Context.AUDIO_SERVICE);
// Set the volume of played media to maximum.
audioTrack.setStereoVolume(1.0f,1.0f);
Log.d("Clapper","player start");
audioTrack.play();
while (isPlaying && dis.available() > 0) {
int i = 0;
while (dis.available() > 0 && i < audiodata.length) {
audiodata[i] = dis.readShort();
i++;
if(i/50==0)
Log.d("Clapper", "playing now"+i);
}
audioTrack.write(audiodata, 0, audiodata.length);
}
Log.d("Clapper","AUDIO LENGTH: "+String.valueOf(audiodata));
dis.close();
audioTrack.stop();
} catch (Throwable t) {
Log.e("AudioTrack", "Playback Failed");
}
Log.d("Clapper","AUDIO state: "+String.valueOf(audioTrack.getPlayState()));
talkAnimation.stop();
if(audioTrack.getPlayState()!=AudioTrack.PLAYSTATE_PLAYING)
{
runOnUiThread(new Runnable() {
public void run() {
// TODO Auto-generated method stub
imgtalk.setBackgroundResource(R.drawable.talk1);
}
});
}
}