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/*
* Copyright (C) 2017 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.google.android.exoplayer2.ext.ffmpeg;
import android.content.Context;
import android.content.pm.PackageManager;
import com.google.android.exoplayer2.decoder.DecoderInputBuffer;
import com.google.android.exoplayer2.decoder.SimpleOutputBuffer;
import com.google.android.exoplayer2.util.MimeTypes;
import com.android.tv.common.SoftPreconditions;
import java.nio.ByteBuffer;
/**
* Audio decoder which uses ffmpeg extension of ExoPlayer2. Since {@link FfmpegDecoder} is package
* private, expose the decoder via this class. Supported formats are AC3 and MP2.
*/
public class FfmpegAudioDecoder {
private static final int NUM_DECODER_BUFFERS = 1;
// The largest AC3 sample size. This is bigger than the largest MP2 sample size (1729).
private static final int INITIAL_INPUT_BUFFER_SIZE = 2560;
private static boolean AVAILABLE;
static {
AVAILABLE =
FfmpegLibrary.supportsFormat(MimeTypes.AUDIO_AC3)
&& FfmpegLibrary.supportsFormat(MimeTypes.AUDIO_MPEG_L2);
}
private FfmpegDecoder mDecoder;
private DecoderInputBuffer mInputBuffer;
private SimpleOutputBuffer mOutputBuffer;
private boolean mStarted;
/** Return whether Ffmpeg based software audio decoder is available. */
public static boolean isAvailable() {
return AVAILABLE;
}
/** Creates an Ffmpeg based software audio decoder. */
public FfmpegAudioDecoder(Context context) {
if (context.checkSelfPermission("android.permission.INTERNET")
== PackageManager.PERMISSION_GRANTED) {
throw new IllegalStateException("This code should run in an isolated process");
}
}
/**
* Decodes an audio sample.
*
* @param timeUs presentation timestamp of the sample
* @param sample data
*/
public void decode(long timeUs, byte[] sample) {
SoftPreconditions.checkState(AVAILABLE);
mInputBuffer.data.clear();
mInputBuffer.data.put(sample);
mInputBuffer.data.flip();
mInputBuffer.timeUs = timeUs;
mDecoder.decode(mInputBuffer, mOutputBuffer, !mStarted);
if (!mStarted) {
mStarted = true;
}
}
/** Returns a decoded sample from decoder. */
public ByteBuffer getDecodedSample() {
return mOutputBuffer.data;
}
/** Returns the presentation time for the decoded sample. */
public long getDecodedTimeUs() {
return mOutputBuffer.timeUs;
}
/**
* Clear previous decode state if any. Prepares to decode samples of the specified encoding.
* This method should be called before using decode.
*
* @param mime audio encoding
*/
public void resetDecoderState(String mime) {
SoftPreconditions.checkState(AVAILABLE);
release();
try {
mDecoder =
new FfmpegDecoder(
NUM_DECODER_BUFFERS,
NUM_DECODER_BUFFERS,
INITIAL_INPUT_BUFFER_SIZE,
mime,
null);
mStarted = false;
mInputBuffer = mDecoder.createInputBuffer();
// Since native JNI requires direct buffer, we should allocate it by #allocateDirect.
mInputBuffer.data = ByteBuffer.allocateDirect(INITIAL_INPUT_BUFFER_SIZE);
mOutputBuffer = mDecoder.createOutputBuffer();
} catch (FfmpegDecoderException e) {
// if AVAILABLE is {@code true}, this will not happen.
}
}
/** Releases all the resource. */
public void release() {
SoftPreconditions.checkState(AVAILABLE);
if (mDecoder != null) {
mDecoder.release();
mInputBuffer = null;
mOutputBuffer = null;
mDecoder = null;
}
}
}
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