Added a MediaCoded based video view to the widevine sample player app.

Change-Id: I514fee7312c485aa5f7a8c6c0a42ce62e71d2578

proprietary/samplePlayer/src/com/widevine/demo/NonBlockingAudioTrack.java

@@ -0,0 +1,207 @@
+/*
+ * 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 com.widevine.demo;
+
+import android.media.AudioFormat;
+import android.media.AudioManager;
+import android.media.AudioTrack;
+import android.os.Handler;
+import android.os.Message;
+import android.util.Log;
+
+import java.util.LinkedList;
+
+class NonBlockingAudioTrack {
+    private static final String TAG = "NonBlockingAudioTrack";
+
+    private AudioTrack mAudioTrack;
+    private int mSampleRate;
+    private int mFrameSize;
+    private int mBufferSizeInFrames;
+    private int mNumFramesSubmitted = 0;
+
+    class QueueElem {
+        byte[] data;
+        int offset;
+        int size;
+    }
+    private LinkedList<QueueElem> mQueue = new LinkedList();
+
+    private Handler mHandler;
+    private boolean mWriteMorePending = false;
+    private static final int EVENT_WRITE_MORE = 1;
+
+    public NonBlockingAudioTrack(int sampleRate, int channelCount) {
+        int channelConfig;
+        switch (channelCount) {
+            case 1:
+                channelConfig = AudioFormat.CHANNEL_OUT_MONO;
+                break;
+            case 2:
+                channelConfig = AudioFormat.CHANNEL_OUT_STEREO;
+                break;
+            case 6:
+                channelConfig = AudioFormat.CHANNEL_OUT_5POINT1;
+                break;
+            default:
+                throw new IllegalArgumentException();
+        }
+
+        int minBufferSize =
+            AudioTrack.getMinBufferSize(
+                    sampleRate,
+                    channelConfig,
+                    AudioFormat.ENCODING_PCM_16BIT);
+
+        int bufferSize = 2 * minBufferSize;
+
+        mAudioTrack = new AudioTrack(
+                AudioManager.STREAM_MUSIC,
+                sampleRate,
+                channelConfig,
+                AudioFormat.ENCODING_PCM_16BIT,
+                bufferSize,
+                AudioTrack.MODE_STREAM);
+
+        mSampleRate = sampleRate;
+        mFrameSize = 2 * channelCount;
+        mBufferSizeInFrames = bufferSize / mFrameSize;
+
+        mHandler = new Handler() {
+            public void handleMessage(Message msg) {
+                switch (msg.what) {
+                    case EVENT_WRITE_MORE:
+                        mWriteMorePending = false;
+                        writeMore();
+                        break;
+
+                    default:
+                        break;
+                }
+            }
+        };
+    }
+
+    public long getAudioTimeUs() {
+        int numFramesPlayed = mAudioTrack.getPlaybackHeadPosition();
+
+        return (numFramesPlayed * 1000000L) / mSampleRate;
+    }
+
+    public void play() {
+        mAudioTrack.play();
+    }
+
+    public void stop() {
+        cancelWriteMore();
+
+        mAudioTrack.stop();
+
+        mNumFramesSubmitted = 0;
+    }
+
+    public void pause() {
+        cancelWriteMore();
+
+        mAudioTrack.pause();
+    }
+
+    public void release() {
+        cancelWriteMore();
+
+        mAudioTrack.release();
+        mAudioTrack = null;
+    }
+
+    public int getPlayState() {
+        return mAudioTrack.getPlayState();
+    }
+
+    private void writeMore() {
+        if (mQueue.isEmpty()) {
+            return;
+        }
+
+        int numFramesPlayed = mAudioTrack.getPlaybackHeadPosition();
+        int numFramesPending = mNumFramesSubmitted - numFramesPlayed;
+        int numFramesAvailableToWrite = mBufferSizeInFrames - numFramesPending;
+        int numBytesAvailableToWrite = numFramesAvailableToWrite * mFrameSize;
+
+        while (numBytesAvailableToWrite > 0) {
+            QueueElem elem = mQueue.peekFirst();
+
+            int numBytes = elem.size;
+            if (numBytes > numBytesAvailableToWrite) {
+                numBytes = numBytesAvailableToWrite;
+            }
+
+            int written = mAudioTrack.write(elem.data, elem.offset, numBytes);
+            assert(written == numBytes);
+
+            mNumFramesSubmitted += written / mFrameSize;
+
+            elem.size -= numBytes;
+            if (elem.size == 0) {
+                mQueue.removeFirst();
+
+                if (mQueue.isEmpty()) {
+                    break;
+                }
+            } else {
+                elem.offset += numBytes;
+                break;
+            }
+
+            numBytesAvailableToWrite -= numBytes;
+        }
+
+        if (!mQueue.isEmpty()) {
+            scheduleWriteMore();
+        }
+    }
+
+    private void scheduleWriteMore() {
+        if (mWriteMorePending) {
+            return;
+        }
+
+        int numFramesPlayed = mAudioTrack.getPlaybackHeadPosition();
+        int numFramesPending = mNumFramesSubmitted - numFramesPlayed;
+        int pendingDurationMs = 1000 * numFramesPending / mSampleRate;
+
+        mWriteMorePending = true;
+        mHandler.sendMessageDelayed(
+                mHandler.obtainMessage(EVENT_WRITE_MORE),
+                pendingDurationMs / 3);
+    }
+
+    private void cancelWriteMore() {
+        mHandler.removeMessages(EVENT_WRITE_MORE);
+        mWriteMorePending = false;
+    }
+
+    public void write(byte[] data, int size) {
+        QueueElem elem = new QueueElem();
+        elem.data = data;
+        elem.offset = 0;
+        elem.size = size;
+
+        mQueue.add(elem);
+
+        scheduleWriteMore();
+    }
+}