1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
|
/***************************************************************************
* __________ __ ___.
* 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 android.media.AudioFormat;
import android.media.AudioManager;
import android.media.AudioTrack;
import android.util.Log;
public class RockboxPCM extends AudioTrack
{
byte[] raw_data;
private int buf_len;
private PCMListener l;
private void LOG(CharSequence text)
{
Log.d("Rockbox", (String) text);
}
public RockboxPCM()
{
super(AudioManager.STREAM_MUSIC,
44100,
/* should be CHANNEL_OUT_STEREO in 2.0 and above */
AudioFormat.CHANNEL_CONFIGURATION_STEREO,
AudioFormat.ENCODING_PCM_16BIT,
24<<10,
AudioTrack.MODE_STREAM);
buf_len = 24<<10; /* in bytes */
raw_data = new byte[buf_len]; /* in shorts */
for(int i = 0; i < raw_data.length; i++) raw_data[i] = (byte)0;
l = new PCMListener(buf_len);
}
int bytes2frames(int bytes) {
/* 1 sample is 2 bytes, 2 samples are 1 frame */
return (bytes/4);
}
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.startForeground();
if (getState() == AudioTrack.STATE_INITIALIZED)
{
if (setNotificationMarkerPosition(bytes2frames(buf_len)/4) != AudioTrack.SUCCESS)
LOG("setNotificationMarkerPosition Error");
else
setPlaybackPositionUpdateListener(l);
}
/* 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.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 {
int max_len;
int refill_mark;
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;
}
@Override
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:
/* recharge */
setPlaybackPositionUpdateListener(this);
/* refill at 25% no matter of how many bytes we've written */
setNotificationMarkerPosition(bytes2frames(refill_mark));
break;
case AudioTrack.PLAYSTATE_STOPPED:
LOG("State STOPPED");
break;
}
}
else
{
LOG("Error in onMarkerReached (result="+result+")");
stop();
}
}
@Override
public void onPeriodicNotification(AudioTrack track) {
// TODO Auto-generated method stub
}
}
}
|
