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/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.ex.variablespeed;
import com.android.common.io.MoreCloseables;
import android.content.Context;
import android.content.res.AssetFileDescriptor;
import android.net.Uri;
import java.io.FileDescriptor;
import java.io.FileNotFoundException;
import java.lang.reflect.Field;
/**
* Provides all the native calls through to the underlying audio library.
* <p>
* You should not use this class directly. Prefer to use the {@link VariableSpeed}
* class instead.
*/
/*package*/ class VariableSpeedNative {
/*package*/ static void loadLibrary() throws UnsatisfiedLinkError, SecurityException {
System.loadLibrary("variablespeed");
}
/*package*/ static boolean playFromContext(Context context, Uri uri)
throws FileNotFoundException {
AssetFileDescriptor afd = context.getContentResolver().openAssetFileDescriptor(uri, "r");
try {
FileDescriptor fileDescriptor = afd.getFileDescriptor();
Field descriptorField = fileDescriptor.getClass().getDeclaredField("descriptor");
descriptorField.setAccessible(true);
int fd = descriptorField.getInt(fileDescriptor);
VariableSpeedNative.playFileDescriptor(fd, afd.getStartOffset(), afd.getLength());
return true;
} catch (SecurityException e) {
// Fall through.
} catch (NoSuchFieldException e) {
// Fall through.
} catch (IllegalArgumentException e) {
// Fall through.
} catch (IllegalAccessException e) {
// Fall through.
} finally {
MoreCloseables.closeQuietly(afd);
}
return false;
}
/*package*/ static native void playUri(String uri);
/*package*/ static native void playFileDescriptor(int fd, long offset, long length);
/*package*/ static native void setVariableSpeed(float speed);
/*package*/ static native void startPlayback();
/*package*/ static native void stopPlayback();
/*package*/ static native void shutdownEngine();
/*package*/ static native int getCurrentPosition();
/*package*/ static native int getTotalDuration();
/*package*/ static void initializeEngine(EngineParameters params) {
initializeEngine(params.getTargetFrames(),
params.getWindowDuration(), params.getWindowOverlapDuration(),
params.getMaxPlayBufferCount(), params.getInitialRate(),
params.getDecodeBufferInitialSize(), params.getDecodeBufferMaxSize(),
params.getStartPositionMillis(), params.getAudioStreamType());
}
private static native void initializeEngine(int targetFrames,
float windowDuration, float windowOverlapDuration, int maxPlayBufferCount,
float initialRate, int decodeBufferInitialSize, int decodeBufferMaxSize,
int startPositionMillis, int audioStreamType);
}
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