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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2010 Thomas Martitz
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
package org.rockbox;
import java.util.Arrays;
import android.media.AudioFormat;
import android.media.AudioManager;
import android.media.AudioTrack;
import android.os.Handler;
import android.os.HandlerThread;
import android.os.Process;
import android.util.Log;
public class RockboxPCM extends AudioTrack
{
private byte[] raw_data;
private PCMListener l;
private HandlerThread ht;
private Handler h = null;
private static final int samplerate = 44100;
/* should be CHANNEL_OUT_STEREO in 2.0 and above */
private static final int channels =
AudioFormat.CHANNEL_CONFIGURATION_STEREO;
private static final int encoding =
AudioFormat.ENCODING_PCM_16BIT;
/* 24k is plenty, but some devices may have a higher minimum */
private static final int buf_len =
Math.max(24<<10, getMinBufferSize(samplerate, channels, encoding));
private void LOG(CharSequence text)
{
Log.d("Rockbox", (String) text);
}
public RockboxPCM()
{
super(AudioManager.STREAM_MUSIC, samplerate, channels, encoding,
buf_len, AudioTrack.MODE_STREAM);
ht = new HandlerThread("audio thread",
Process.THREAD_PRIORITY_URGENT_AUDIO);
ht.start();
raw_data = new byte[buf_len]; /* in shorts */
Arrays.fill(raw_data, (byte) 0);
l = new PCMListener(buf_len);
}
private int bytes2frames(int bytes)
{
/* 1 sample is 2 bytes, 2 samples are 1 frame */
return (bytes/4);
}
private int frames2bytes(int frames)
{
/* 1 frame is 2 samples, 1 sample is 2 bytes */
return (frames*4);
}
@SuppressWarnings("unused")
private void play_pause(boolean pause) {
if (pause)
{
pause();
}
else
{
if (getPlayState() == AudioTrack.PLAYSTATE_STOPPED)
{
RockboxService.get_instance().startForeground();
if (getState() == AudioTrack.STATE_INITIALIZED)
{
if (h == null)
h = new Handler(ht.getLooper());
if (setNotificationMarkerPosition(bytes2frames(buf_len)/4)
!= AudioTrack.SUCCESS)
LOG("setNotificationMarkerPosition Error");
else
setPlaybackPositionUpdateListener(l, h);
}
/* need to fill with silence before starting playback */
write(raw_data, frames2bytes(getPlaybackHeadPosition()),
raw_data.length);
}
play();
}
}
@Override
public void stop() throws IllegalStateException
{
try {
super.stop();
} catch (IllegalStateException e) {
throw new IllegalStateException(e);
}
RockboxService.get_instance().stopForeground();
}
@SuppressWarnings("unused")
private void set_volume(int volume)
{
/* volume comes from 0..-990 from Rockbox */
/* TODO:
* volume is in dB, but this code acts as if it were in %, convert? */
float fvolume;
/* special case min and max volume to not suffer from
* floating point accuracy */
if (volume == 0)
fvolume = 1.0f;
else if (volume == -990)
fvolume = 0.0f;
else
fvolume = (volume + 990)/990.0f;
setStereoVolume(fvolume, fvolume);
}
public native void pcmSamplesToByteArray(byte[] dest);
private class PCMListener implements OnPlaybackPositionUpdateListener
{
private int max_len;
private int refill_mark;
private byte[] buf;
public PCMListener(int len)
{
max_len = len;
/* refill to 100% when reached the 25% */
buf = new byte[max_len*3/4];
refill_mark = max_len - buf.length;
}
public void onMarkerReached(AudioTrack track)
{
/* push new data to the hardware */
RockboxPCM pcm = (RockboxPCM)track;
int result = -1;
pcm.pcmSamplesToByteArray(buf);
result = track.write(buf, 0, buf.length);
if (result >= 0)
{
switch(track.getPlayState())
{
case AudioTrack.PLAYSTATE_PLAYING:
case AudioTrack.PLAYSTATE_PAUSED:
/* refill at 25% no matter of how many
* bytes we've written */
if (setNotificationMarkerPosition(
bytes2frames(refill_mark))
!= AudioTrack.SUCCESS)
{
LOG("Error in onMarkerReached: " +
"Could not set notification marker");
}
else /* recharge */
setPlaybackPositionUpdateListener(this, h);
break;
case AudioTrack.PLAYSTATE_STOPPED:
LOG("State STOPPED");
break;
}
}
else
{
LOG("Error in onMarkerReached (result="+result+")");
stop();
}
}
public void onPeriodicNotification(AudioTrack track)
{
}
}
}
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