/**
* If this is an audio ubin, we store the resource as a file that can be played with MediaPlayer.
*
* @param ubinData An object honding information about this resource.
* @param resHandle The id of the audio resource.
*/
public void storeIfAudioUBin(UBinData ubinData, int resHandle) {
SYSLOG("MoSyncSound.storeIfAudioUBin - ubinData.getSize(): " + ubinData.getSize() + "bytes");
if (!checkIfMimeAudioType(ubinData)) {
// This is not an audio resource.
return;
}
try {
// Open the resource file.
AssetManager assetManager = getActivity().getAssets();
// RESOURCE_FILE = "resources.mp3"
AssetFileDescriptor fileDescriptor = assetManager.openFd(MoSyncThread.RESOURCE_FILE);
FileInputStream inputStream = fileDescriptor.createInputStream();
// Jump to beginning of resource.
inputStream.skip(ubinData.getOffset() - mMoSyncThread.getResourceStartOffset());
// Read mime string.
String mimeType = readMimeStringFromFile(inputStream);
int mimeStringLength = mimeType.length() + 1;
// Calculate size of audio data.
int length = ubinData.getSize() - mimeStringLength;
// Create buffer to hold audio data.
byte[] buffer = new byte[length];
// We should be at the start of audio data after reading the mime string.
inputStream.read(buffer);
// Close input stream.
inputStream.close();
// Create a temporary audio file
String fileName = "MOSYNCTEMP:audio" + resHandle + ".tmp";
FileOutputStream outputStream =
getActivity()
.openFileOutput(fileName, Context.MODE_WORLD_READABLE | Context.MODE_WORLD_WRITEABLE);
// Write audio data.
outputStream.write(buffer);
// Close output steram.
outputStream.close();
// Store sound data in audio table.
// TODO: Unify AudioStore with UBinData ?
mAudioStores.put(resHandle, new AudioStore(mimeType, length, fileName));
} catch (Exception ex) {
Log.e("MoSyncAudio.storeIfAudioUBin", "Unable to save temporary audio file.");
ex.printStackTrace();
}
}
/**
* Checks if the header of a resource is of audio mime type.
*
* @param ubinData A description of a ubin resource.
* @return true if the header is of type "audio", false if not.
*/
final boolean checkIfMimeAudioType(UBinData ubinData) {
try {
// Open the resource file.
AssetManager assetManager = getActivity().getAssets();
// RESOURCE_FILE = "resources.mp3"
AssetFileDescriptor fileDescriptor = assetManager.openFd(MoSyncThread.RESOURCE_FILE);
FileInputStream stream = fileDescriptor.createInputStream();
// Jump to start of this audio resource.
stream.skip(ubinData.getOffset() - mMoSyncThread.getResourceStartOffset());
// Determine if this is an audio file by examining the header bytes.
byte header[] = new byte[5];
stream.read(header);
stream.close();
return checkIfMimeAudioType(header);
} catch (Exception ex) {
ex.printStackTrace();
return false;
}
}