public boolean testRecord() throws Exception {
AudioStream stream = getRecordedStream();
if (stream != null) {
audioSpec.inferResultsFrom(stream); // do not move this before the corrector
return stream.isValid(recordTimeMS) && stream.isDecodeable();
} else return false;
}
@Override
public synchronized void start() throws IllegalStateException, IOException {
if (!mStreaming) {
configure();
super.start();
}
}
/** Stops the stream. */
public synchronized void stop() {
if (mStreaming) {
Log.d(TAG, "Interrupting threads...");
mThread.interrupt();
mAudioRecord.stop();
mAudioRecord.release();
mAudioRecord = null;
super.stop();
}
}
public synchronized void configure() throws IllegalStateException, IOException {
super.configure();
mQuality = mRequestedQuality.clone();
// Checks if the user has supplied an exotic sampling rate
int i = 0;
for (; i < AUDIO_SAMPLING_RATES.length; i++) {
if (AUDIO_SAMPLING_RATES[i] == mQuality.samplingRate) {
mSamplingRateIndex = i;
break;
}
}
// If he did, we force a reasonable one: 16 kHz
if (i > 12) mQuality.samplingRate = 16000;
if (mMode != mRequestedMode || mPacketizer == null) {
mMode = mRequestedMode;
mPacketizer = new AACLATMPacketizer();
mPacketizer.setDestination(mDestination, mRtpPort, mRtcpPort);
mPacketizer.getRtpSocket().setOutputStream(mOutputStream, mChannelIdentifier);
}
mProfile = 2; // AAC LC
mChannel = 1;
mConfig = mProfile << 11 | mSamplingRateIndex << 7 | mChannel << 3;
mSessionDescription =
"m=audio "
+ String.valueOf(getDestinationPorts()[0])
+ " RTP/AVP 96\r\n"
+ "a=rtpmap:96 mpeg4-generic/"
+ mQuality.samplingRate
+ "\r\n"
+ "a=fmtp:96 streamtype=5; profile-level-id=15; mode=AAC-hbr; config="
+ Integer.toHexString(mConfig)
+ "; SizeLength=13; IndexLength=3; IndexDeltaLength=3;\r\n";
}
/**
* Records a short sample of AAC ADTS from the microphone to find out what the sampling rate
* really is On some phone indeed, no error will be reported if the sampling rate used differs
* from the one selected with setAudioSamplingRate
*
* @throws IOException
* @throws IllegalStateException
*/
private void testADTS() throws IllegalStateException, IOException {
if (mSettings != null) {
if (mSettings.contains("aac-" + mSamplingRate)) {
String[] s = mSettings.getString("aac-" + mSamplingRate, "").split(",");
mActualSamplingRate = Integer.valueOf(s[0]);
mConfig = Integer.valueOf(s[1]);
mChannel = Integer.valueOf(s[2]);
return;
}
}
final String TESTFILE =
Environment.getExternalStorageDirectory().getPath() + "/spydroid-test.adts";
if (!Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
throw new IllegalStateException("No external storage or external storage not ready !");
}
// The structure of an ADTS packet is described here:
// http://wiki.multimedia.cx/index.php?title=ADTS
// ADTS header is 7 or 9 bytes long
byte[] buffer = new byte[9];
// That means the H264Stream will behave as a regular MediaRecorder object
// it will not start the packetizer thread and can be used to save video in a file
setMode(MODE_DEFAULT);
mMediaRecorder.setOutputFile(TESTFILE);
super.prepare();
start();
// We record for 1 sec
// TODO: use the MediaRecorder.OnInfoListener
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
}
stop();
setMode(MODE_STREAMING);
File file = new File(TESTFILE);
RandomAccessFile raf = new RandomAccessFile(file, "r");
// ADTS packets start with a sync word: 12bits set to 1
while (true) {
if ((raf.readByte() & 0xFF) == 0xFF) {
buffer[0] = raf.readByte();
if ((buffer[0] & 0xF0) == 0xF0) break;
}
}
raf.read(buffer, 1, 5);
mSamplingRateIndex = (buffer[1] & 0x3C) >> 2;
mProfile = ((buffer[1] & 0xC0) >> 6) + 1;
mChannel = (buffer[1] & 0x01) << 2 | (buffer[2] & 0xC0) >> 6;
mActualSamplingRate = sADTSSamplingRates[mSamplingRateIndex];
// 5 bits for the object type / 4 bits for the sampling rate / 4 bits for the channel / padding
mConfig = mProfile << 11 | mSamplingRateIndex << 7 | mChannel << 3;
Log.i(TAG, "MPEG VERSION: " + ((buffer[0] & 0x08) >> 3));
Log.i(TAG, "PROTECTION: " + (buffer[0] & 0x01));
Log.i(TAG, "PROFILE: " + sAudioObjectTypes[mProfile]);
Log.i(TAG, "SAMPLING FREQUENCY: " + mActualSamplingRate);
Log.i(TAG, "CHANNEL: " + mChannel);
raf.close();
if (mSettings != null) {
Editor editor = mSettings.edit();
editor.putString(
"aac-" + mSamplingRate, mActualSamplingRate + "," + mConfig + "," + mChannel);
editor.commit();
}
if (!file.delete()) Log.e(TAG, "Temp file could not be erased");
}
public void prepare() throws IllegalStateException, IOException {
testADTS();
((AACADTSPacketizer) mPacketizer).setSamplingRate(mActualSamplingRate);
super.prepare();
}
