1 files changed, 178 insertions, 0 deletions
diff --git a/tests/Camera2Tests/SmartCamera/SimpleCamera/src/androidx/media/filterfw/decoder/TrackDecoder.java b/tests/Camera2Tests/SmartCamera/SimpleCamera/src/androidx/media/filterfw/decoder/TrackDecoder.java
new file mode 100644
index 0000000..c81e8b4
--- /dev/null
+++ b/tests/Camera2Tests/SmartCamera/SimpleCamera/src/androidx/media/filterfw/decoder/TrackDecoder.java
@@ -0,0 +1,178 @@
+/*
+ * Copyright (C) 2012 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 androidx.media.filterfw.decoder;
+
+import android.annotation.TargetApi;
+import android.media.MediaCodec;
+import android.media.MediaCodec.BufferInfo;
+import android.media.MediaExtractor;
+import android.media.MediaFormat;
+import android.util.Log;
+
+import java.nio.ByteBuffer;
+
+@TargetApi(16)
+abstract class TrackDecoder {
+
+    interface Listener {
+        void onDecodedOutputAvailable(TrackDecoder decoder);
+
+        void onEndOfStream(TrackDecoder decoder);
+    }
+
+    private static final String LOG_TAG = "TrackDecoder";
+
+    private static final long TIMEOUT_US = 50; // Timeout for en-queueing and de-queueing buffers.
+
+    private static final int NO_INPUT_BUFFER = -1;
+
+    private final int mTrackIndex;
+    private final MediaFormat mMediaFormat;
+    private final Listener mListener;
+
+    private MediaCodec mMediaCodec;
+    private MediaFormat mOutputFormat;
+
+    private ByteBuffer[] mCodecInputBuffers;
+    private ByteBuffer[] mCodecOutputBuffers;
+
+    private boolean mShouldEnqueueEndOfStream;
+
+    /**
+     * @return a configured {@link MediaCodec}.
+     */
+    protected abstract MediaCodec initMediaCodec(MediaFormat format);
+
+    /**
+     * Called when decoded output is available. The implementer is responsible for releasing the
+     * assigned buffer.
+     *
+     * @return {@code true} if any further decoding should be attempted at the moment.
+     */
+    protected abstract boolean onDataAvailable(
+            MediaCodec codec, ByteBuffer[] buffers, int bufferIndex, BufferInfo info);
+
+    protected TrackDecoder(int trackIndex, MediaFormat mediaFormat, Listener listener) {
+        mTrackIndex = trackIndex;
+
+        if (mediaFormat == null) {
+            throw new NullPointerException("mediaFormat cannot be null");
+        }
+        mMediaFormat = mediaFormat;
+
+        if (listener == null) {
+            throw new NullPointerException("listener cannot be null");
+        }
+        mListener = listener;
+    }
+
+    public void init() {
+        mMediaCodec = initMediaCodec(mMediaFormat);
+        mMediaCodec.start();
+        mCodecInputBuffers = mMediaCodec.getInputBuffers();
+        mCodecOutputBuffers = mMediaCodec.getOutputBuffers();
+    }
+
+    public void signalEndOfInput() {
+        mShouldEnqueueEndOfStream = true;
+        tryEnqueueEndOfStream();
+    }
+
+    public void release() {
+        if (mMediaCodec != null) {
+            mMediaCodec.stop();
+            mMediaCodec.release();
+        }
+    }
+
+    protected MediaCodec getMediaCodec() {
+        return mMediaCodec;
+    }
+
+    protected void notifyListener() {
+        mListener.onDecodedOutputAvailable(this);
+    }
+
+    public boolean feedInput(MediaExtractor mediaExtractor) {
+        long presentationTimeUs = 0;
+
+        int inputBufferIndex = mMediaCodec.dequeueInputBuffer(TIMEOUT_US);
+        if (inputBufferIndex != NO_INPUT_BUFFER) {
+            ByteBuffer destinationBuffer = mCodecInputBuffers[inputBufferIndex];
+            int sampleSize = mediaExtractor.readSampleData(destinationBuffer, 0);
+            // We don't expect to get a sample without any data, so this should never happen.
+            if (sampleSize < 0) {
+                Log.w(LOG_TAG, "Media extractor had sample but no data.");
+
+                // Signal the end of the track immediately anyway, using the buffer.
+                mMediaCodec.queueInputBuffer(
+                        inputBufferIndex, 0, 0, 0, MediaCodec.BUFFER_FLAG_END_OF_STREAM);
+                return false;
+            }
+
+            presentationTimeUs = mediaExtractor.getSampleTime();
+            mMediaCodec.queueInputBuffer(
+                    inputBufferIndex,
+                    0,
+                    sampleSize,
+                    presentationTimeUs,
+                    0);
+
+            return mediaExtractor.advance()
+                    && mediaExtractor.getSampleTrackIndex() == mTrackIndex;
+        }
+        return false;
+    }
+
+    private void tryEnqueueEndOfStream() {
+        int inputBufferIndex = mMediaCodec.dequeueInputBuffer(TIMEOUT_US);
+        // We will always eventually have an input buffer, because we keep trying until the last
+        // decoded frame is output.
+        // The EoS does not need to be signaled if the application stops decoding.
+        if (inputBufferIndex != NO_INPUT_BUFFER) {
+            mMediaCodec.queueInputBuffer(
+                    inputBufferIndex, 0, 0, 0, MediaCodec.BUFFER_FLAG_END_OF_STREAM);
+            mShouldEnqueueEndOfStream = false;
+        }
+    }
+
+    public boolean drainOutputBuffer() {
+        BufferInfo outputInfo = new BufferInfo();
+        int outputBufferIndex = mMediaCodec.dequeueOutputBuffer(outputInfo, TIMEOUT_US);
+
+        if ((outputInfo.flags & MediaCodec.BUFFER_FLAG_END_OF_STREAM) != 0) {
+            mListener.onEndOfStream(this);
+            return false;
+        }
+        if (mShouldEnqueueEndOfStream) {
+            tryEnqueueEndOfStream();
+        }
+        if (outputBufferIndex >= 0) {
+            return onDataAvailable(
+                    mMediaCodec, mCodecOutputBuffers, outputBufferIndex, outputInfo);
+        } else if (outputBufferIndex == MediaCodec.INFO_OUTPUT_BUFFERS_CHANGED) {
+            mCodecOutputBuffers = mMediaCodec.getOutputBuffers();
+            return true;
+        } else if (outputBufferIndex == MediaCodec.INFO_OUTPUT_FORMAT_CHANGED) {
+            mOutputFormat = mMediaCodec.getOutputFormat();
+            Log.d(LOG_TAG, "Output format has changed to " + mOutputFormat);
+            return true;
+        }
+        return false;
+    }
+
+}