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/*
* Copyright (C) 2014 Yuya Tanaka
*
* 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 net.ypresto.androidtranscoder.engine;
import android.media.MediaExtractor;
import android.media.MediaFormat;
import android.media.MediaMetadataRetriever;
import android.media.MediaMuxer;
import android.util.Log;
import net.ypresto.androidtranscoder.format.MediaFormatStrategy;
import net.ypresto.androidtranscoder.utils.MediaExtractorUtils;
import java.io.FileDescriptor;
import java.io.IOException;
/**
* Internal engine, do not use this directly.
*/
// TODO: treat encrypted data
public class MediaTranscoderEngine {
private static final String TAG = "MediaTranscoderEngine";
private static final double PROGRESS_UNKNOWN = -1.0;
private static final long SLEEP_TO_WAIT_TRACK_TRANSCODERS = 10;
private static final long PROGRESS_INTERVAL_STEPS = 10;
private FileDescriptor mInputFileDescriptor;
private TrackTranscoder mVideoTrackTranscoder;
private TrackTranscoder mAudioTrackTranscoder;
private MediaExtractor mExtractor;
private MediaMuxer mMuxer;
private volatile double mProgress;
private ProgressCallback mProgressCallback;
private long mDurationUs;
/**
* Do not use this constructor unless you know what you are doing.
*/
public MediaTranscoderEngine() {
}
public void setDataSource(FileDescriptor fileDescriptor) {
mInputFileDescriptor = fileDescriptor;
}
public ProgressCallback getProgressCallback() {
return mProgressCallback;
}
public void setProgressCallback(ProgressCallback progressCallback) {
mProgressCallback = progressCallback;
}
/**
* NOTE: This method is thread safe.
*/
public double getProgress() {
return mProgress;
}
/**
* Run video transcoding. Blocks current thread.
* Audio data will not be transcoded; original stream will be wrote to output file.
*
* @param outputPath File path to output transcoded video file.
* @param formatStrategy Output format strategy.
* @throws IOException when input or output file could not be opened.
* @throws InvalidOutputFormatException when output format is not supported.
* @throws InterruptedException when cancel to transcode.
*/
public void transcodeVideo(String outputPath, MediaFormatStrategy formatStrategy) throws IOException, InterruptedException {
if (outputPath == null) {
throw new NullPointerException("Output path cannot be null.");
}
if (mInputFileDescriptor == null) {
throw new IllegalStateException("Data source is not set.");
}
try {
// NOTE: use single extractor to keep from running out audio track fast.
mExtractor = new MediaExtractor();
mExtractor.setDataSource(mInputFileDescriptor);
mMuxer = new MediaMuxer(outputPath, MediaMuxer.OutputFormat.MUXER_OUTPUT_MPEG_4);
setupMetadata();
setupTrackTranscoders(formatStrategy);
runPipelines();
mMuxer.stop();
} finally {
try {
if (mVideoTrackTranscoder != null) {
mVideoTrackTranscoder.release();
mVideoTrackTranscoder = null;
}
if (mAudioTrackTranscoder != null) {
mAudioTrackTranscoder.release();
mAudioTrackTranscoder = null;
}
if (mExtractor != null) {
mExtractor.release();
mExtractor = null;
}
} catch (RuntimeException e) {
// Too fatal to make alive the app, because it may leak native resources.
//noinspection ThrowFromFinallyBlock
throw new Error("Could not shutdown extractor, codecs and muxer pipeline.", e);
}
try {
if (mMuxer != null) {
mMuxer.release();
mMuxer = null;
}
} catch (RuntimeException e) {
Log.e(TAG, "Failed to release muxer.", e);
}
}
}
private void setupMetadata() throws IOException {
MediaMetadataRetriever mediaMetadataRetriever = new MediaMetadataRetriever();
mediaMetadataRetriever.setDataSource(mInputFileDescriptor);
String rotationString = mediaMetadataRetriever.extractMetadata(MediaMetadataRetriever.METADATA_KEY_VIDEO_ROTATION);
try {
mMuxer.setOrientationHint(Integer.parseInt(rotationString));
} catch (NumberFormatException e) {
// skip
}
// TODO: parse ISO 6709
// String locationString = mediaMetadataRetriever.extractMetadata(MediaMetadataRetriever.METADATA_KEY_LOCATION);
// mMuxer.setLocation(Integer.getInteger(rotationString, 0));
try {
mDurationUs = Long.parseLong(mediaMetadataRetriever.extractMetadata(MediaMetadataRetriever.METADATA_KEY_DURATION)) * 1000;
} catch (NumberFormatException e) {
mDurationUs = -1;
}
Log.d(TAG, "Duration (us): " + mDurationUs);
}
private void setupTrackTranscoders(MediaFormatStrategy formatStrategy) {
MediaExtractorUtils.TrackResult trackResult = MediaExtractorUtils.getFirstVideoAndAudioTrack(mExtractor);
MediaFormat videoOutputFormat = formatStrategy.createVideoOutputFormat(trackResult.mVideoTrackFormat);
MediaFormat audioOutputFormat = formatStrategy.createAudioOutputFormat(trackResult.mAudioTrackFormat);
if (videoOutputFormat == null && audioOutputFormat == null) {
throw new InvalidOutputFormatException("MediaFormatStrategy returned pass-through for both video and audio. No transcoding is necessary.");
}
QueuedMuxer queuedMuxer = new QueuedMuxer(mMuxer, new QueuedMuxer.Listener() {
@Override
public void onDetermineOutputFormat() {
MediaFormatValidator.validateVideoOutputFormat(mVideoTrackTranscoder.getDeterminedFormat());
MediaFormatValidator.validateAudioOutputFormat(mAudioTrackTranscoder.getDeterminedFormat());
}
});
if (videoOutputFormat == null) {
mVideoTrackTranscoder = new PassThroughTrackTranscoder(mExtractor, trackResult.mVideoTrackIndex, queuedMuxer, QueuedMuxer.SampleType.VIDEO);
} else {
mVideoTrackTranscoder = new VideoTrackTranscoder(mExtractor, trackResult.mVideoTrackIndex, videoOutputFormat, queuedMuxer);
}
mVideoTrackTranscoder.setup();
if (audioOutputFormat == null) {
mAudioTrackTranscoder = new PassThroughTrackTranscoder(mExtractor, trackResult.mAudioTrackIndex, queuedMuxer, QueuedMuxer.SampleType.AUDIO);
} else {
mAudioTrackTranscoder = new AudioTrackTranscoder(mExtractor, trackResult.mAudioTrackIndex, audioOutputFormat, queuedMuxer);
}
mAudioTrackTranscoder.setup();
mExtractor.selectTrack(trackResult.mVideoTrackIndex);
mExtractor.selectTrack(trackResult.mAudioTrackIndex);
}
private void runPipelines() throws InterruptedException {
long loopCount = 0;
if (mDurationUs <= 0) {
double progress = PROGRESS_UNKNOWN;
mProgress = progress;
if (mProgressCallback != null) mProgressCallback.onProgress(progress); // unknown
}
while (!(mVideoTrackTranscoder.isFinished() && mAudioTrackTranscoder.isFinished())) {
boolean stepped = mVideoTrackTranscoder.stepPipeline()
|| mAudioTrackTranscoder.stepPipeline();
loopCount++;
if (mDurationUs > 0 && loopCount % PROGRESS_INTERVAL_STEPS == 0) {
double videoProgress = mVideoTrackTranscoder.isFinished() ? 1.0 : Math.min(1.0, (double) mVideoTrackTranscoder.getWrittenPresentationTimeUs() / mDurationUs);
double audioProgress = mAudioTrackTranscoder.isFinished() ? 1.0 : Math.min(1.0, (double) mAudioTrackTranscoder.getWrittenPresentationTimeUs() / mDurationUs);
double progress = (videoProgress + audioProgress) / 2.0;
mProgress = progress;
if (mProgressCallback != null) mProgressCallback.onProgress(progress);
}
if (!stepped) {
Thread.sleep(SLEEP_TO_WAIT_TRACK_TRANSCODERS);
}
}
}
public interface ProgressCallback {
/**
* Called to notify progress. Same thread which initiated transcode is used.
*
* @param progress Progress in [0.0, 1.0] range, or negative value if progress is unknown.
*/
void onProgress(double progress);
}
}
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