1 files changed, 219 insertions, 0 deletions
diff --git a/libs/android-transcoder/src/main/java/net/ypresto/androidtranscoder/engine/MediaTranscoderEngine.java b/libs/android-transcoder/src/main/java/net/ypresto/androidtranscoder/engine/MediaTranscoderEngine.java
new file mode 100644
index 000000000..64a1edef4
--- /dev/null
+++ b/libs/android-transcoder/src/main/java/net/ypresto/androidtranscoder/engine/MediaTranscoderEngine.java
@@ -0,0 +1,219 @@
+/*
+ * 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() {
+        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) {
+                try {
+                    Thread.sleep(SLEEP_TO_WAIT_TRACK_TRANSCODERS);
+                } catch (InterruptedException e) {
+                    // nothing to do
+                }
+            }
+        }
+    }
+
+    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);
+    }
+}