setDataSource() with offset is for playing an embedded media file. In
other words, there must be a valid WAVE header at the specified
offset. An example use case is a resource file that contains many WAVE
files with a table of contents at the beginning.
You can call seekTo() to start playback at time offset.
On Dec 19, 8:28 am, Kenneth Loafman <kenneth.loaf...@gmail.com> wrote:
> This code segment:
>
>
>
> > path = "/data/noise.wav";
> > file = new File(path);
>
> > tx.setText("Prepping audio...");
> > Log.i(TAG, "Prepping audio");
>
> > for (int i = 0; i < nPlay; ++i) {
> > myPlayers[i] = new MediaPlayer();
> > randFile[i] = new RandomAccessFile(file, "r");
> > myPlayers[i].setAudioStreamType(AudioManager.STREAM_MUSIC);
> > myPlayers[i].setDataSource(randFile[i].getFD(),
> > i * segSize,
> > segSize);
> > Log.i(TAG, "Prepping: " + i);
> > myPlayers[i].prepare();
> > }
>
> produces this log:
>
>
>
> >12-19 10:05:38.369: INFO/SilentSpeech(3427): Prepping audio
> >12-19 10:05:38.409: INFO/SilentSpeech(3427): Prepping: 0
> >12-19 10:05:38.449: INFO/SilentSpeech(3427): Prepping: 1
> >12-19 10:05:38.469: ERROR/SilentSpeech(3427): error: Prepare failed.:
> >status=0xFFFFFFFC
> >12-19 10:05:38.469: ERROR/SilentSpeech(3427): java.io.IOException: Prepare
> >failed.: status=0xFFFFFFFC
> >12-19 10:05:38.469: ERROR/SilentSpeech(3427): at
> >android.media.MediaPlayer.prepare(Native Method)
> >12-19 10:05:38.469: ERROR/SilentSpeech(3427): at
> >com.android.silentspeech.SSActivity.playAudio(SSActivity.java:55)
> >12-19 10:05:38.469: ERROR/SilentSpeech(3427): at
> >com.android.silentspeech.SSActivity.onCreate(SSActivity.java:38)
> >12-19 10:05:38.469: ERROR/SilentSpeech(3427): at
> >android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1122)
> >12-19 10:05:38.469: ERROR/SilentSpeech(3427): at
> >android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2103)
> >12-19 10:05:38.469: ERROR/SilentSpeech(3427): at
> >android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2156)
> >12-19 10:05:38.469: ERROR/SilentSpeech(3427): at
> >android.app.ActivityThread.access$1800(ActivityThread.java:112)
> >12-19 10:05:38.469: ERROR/SilentSpeech(3427): at
> >android.app.ActivityThread$H.handleMessage(ActivityThread.java:1580)
> >12-19 10:05:38.469: ERROR/SilentSpeech(3427): at
> >android.os.Handler.dispatchMessage(Handler.java:88)
> >12-19 10:05:38.469: ERROR/SilentSpeech(3427): at
> >android.os.Looper.loop(Looper.java:123)
> >12-19 10:05:38.469: ERROR/SilentSpeech(3427): at
> >android.app.ActivityThread.main(ActivityThread.java:3742)
> >12-19 10:05:38.469: ERROR/SilentSpeech(3427): at
> >java.lang.reflect.Method.invokeNative(Native Method)
> >12-19 10:05:38.469: ERROR/SilentSpeech(3427): at
> >java.lang.reflect.Method.invoke(Method.java:515)
> >12-19 10:05:38.469: ERROR/SilentSpeech(3427): at
> >com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:739)
> >12-19 10:05:38.469: ERROR/SilentSpeech(3427): at
> >com.android.internal.os.ZygoteInit.main(ZygoteInit.java:497)
> >12-19 10:05:38.469: ERROR/SilentSpeech(3427): at
> >dalvik.system.NativeStart.main(Native Method)
>
> If I replace "i * segSize" with "0" to always start at the front, it
> works. Strange.
>
> Does this mean that:
> 1) setDataSource() does not work with offset? -or-
> 2) do I need to put a file header at each offset?
>
> If the answer is 2, is there an option to take raw input?
>
> ...Thanks,
> ...Ken
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