Android 媒体播放器在流彩信协议时停止播放?
我的 Android 应用程序使用 AudioTrack 类通过 MMS 流播放广播,如下所述 此处
问题是,播放第一个块后,设备没有获得任何音频输出。
这是可能有用的 logcat 信息
DEBUG/WifiService(1904): ACTION_BATTERY_CHANGED pluggedType: 2
11-12 11:21:07.953: INFO/Hello(2821): There
11-12 11:21:07.958: INFO/Get Current Player State(2821): 3
11-12 11:21:07.958: INFO/Paused(2821): 2
11-12 11:21:07.958: INFO/Playing(2821): 3
11-12 11:21:07.958: INFO/Stopped(2821): 1
11-12 11:21:07.963: INFO/Size(2821): 7864364
11-12 11:21:08.023: DEBUG/dalvikvm(2821): GC freed 103 objects / 4184 bytes in 62ms
11-12 11:21:08.078: INFO/dalvikvm-heap(2821): Grow heap (frag case) to 14.770MB for 7864380-byte allocation
11-12 11:21:08.153: DEBUG/dalvikvm(2821): GC freed 0 objects / 0 bytes in 74ms
11-12 11:21:08.273: ERROR/AudioPolicyManager(1868): [HJ] isDuplicated = 0
11-12 11:21:08.273: ERROR/AudioPolicyManager(1868): 1.[HJ] Headset Volume = 0.354813 , device = 4
11-12 11:21:08.273: INFO/Offset(2821): 11837528
这是代码(这是从 C 代码定期调用的方法本身)
boolean b = false;
Log.i("Hello", "There");
if (at != null) {
Log.i("Comparing", "" + at.getPlayState());
Log.i("Paused", "" + AudioTrack.PLAYSTATE_PAUSED);
Log.i("Playing", "" + AudioTrack.PLAYSTATE_PLAYING);
Log.i("Stopped", "" + AudioTrack.PLAYSTATE_STOPPED);
b = at.getPlayState() != AudioTrack.PLAYSTATE_PLAYING;
}
try {
if (!b) {
int intSize = android.media.AudioTrack.getMinBufferSize(33075,
AudioFormat.CHANNEL_CONFIGURATION_STEREO,
AudioFormat.ENCODING_PCM_16BIT);
at = new AudioTrack(AudioManager.STREAM_MUSIC, 33075,
AudioFormat.CHANNEL_CONFIGURATION_STEREO,
AudioFormat.ENCODING_PCM_16BIT, intSize * 20,
AudioTrack.MODE_STREAM);
}
if (at == null) {
Log.d("TCAudio", "audio track is not initialised ");
return;
}
// 512 kb
// Reading the file..
byte[] byteData = null;
if (file == null)
file = new File("/sdcard/outmms.wav");
int size = (int) file.length();
Log.i("Size", "" + size);
byteData = new byte[size];
FileInputStream in = null;
try {
in = new FileInputStream(file);
in.read(byteData);
// if (!b) {
at.play();
// }
at.write(byteData, offset, byteData.length);
offset += byteData.length;
Log.i("Offset", "" + offset);
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
} catch (Exception e) {
e.printStackTrace();
}
My android application plays a radio through MMS Stream using AudioTrack class as described here
The Problem is that after playing first chunk the device doesn't get any audio output.
Here is the logcat info that may be useful
DEBUG/WifiService(1904): ACTION_BATTERY_CHANGED pluggedType: 2
11-12 11:21:07.953: INFO/Hello(2821): There
11-12 11:21:07.958: INFO/Get Current Player State(2821): 3
11-12 11:21:07.958: INFO/Paused(2821): 2
11-12 11:21:07.958: INFO/Playing(2821): 3
11-12 11:21:07.958: INFO/Stopped(2821): 1
11-12 11:21:07.963: INFO/Size(2821): 7864364
11-12 11:21:08.023: DEBUG/dalvikvm(2821): GC freed 103 objects / 4184 bytes in 62ms
11-12 11:21:08.078: INFO/dalvikvm-heap(2821): Grow heap (frag case) to 14.770MB for 7864380-byte allocation
11-12 11:21:08.153: DEBUG/dalvikvm(2821): GC freed 0 objects / 0 bytes in 74ms
11-12 11:21:08.273: ERROR/AudioPolicyManager(1868): [HJ] isDuplicated = 0
11-12 11:21:08.273: ERROR/AudioPolicyManager(1868): 1.[HJ] Headset Volume = 0.354813 , device = 4
11-12 11:21:08.273: INFO/Offset(2821): 11837528
Here is the code (It's the method itself which called periodically from C code)
boolean b = false;
Log.i("Hello", "There");
if (at != null) {
Log.i("Comparing", "" + at.getPlayState());
Log.i("Paused", "" + AudioTrack.PLAYSTATE_PAUSED);
Log.i("Playing", "" + AudioTrack.PLAYSTATE_PLAYING);
Log.i("Stopped", "" + AudioTrack.PLAYSTATE_STOPPED);
b = at.getPlayState() != AudioTrack.PLAYSTATE_PLAYING;
}
try {
if (!b) {
int intSize = android.media.AudioTrack.getMinBufferSize(33075,
AudioFormat.CHANNEL_CONFIGURATION_STEREO,
AudioFormat.ENCODING_PCM_16BIT);
at = new AudioTrack(AudioManager.STREAM_MUSIC, 33075,
AudioFormat.CHANNEL_CONFIGURATION_STEREO,
AudioFormat.ENCODING_PCM_16BIT, intSize * 20,
AudioTrack.MODE_STREAM);
}
if (at == null) {
Log.d("TCAudio", "audio track is not initialised ");
return;
}
// 512 kb
// Reading the file..
byte[] byteData = null;
if (file == null)
file = new File("/sdcard/outmms.wav");
int size = (int) file.length();
Log.i("Size", "" + size);
byteData = new byte[size];
FileInputStream in = null;
try {
in = new FileInputStream(file);
in.read(byteData);
// if (!b) {
at.play();
// }
at.write(byteData, offset, byteData.length);
offset += byteData.length;
Log.i("Offset", "" + offset);
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
} catch (Exception e) {
e.printStackTrace();
}
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