1 files changed, 177 insertions, 0 deletions
diff --git a/tuner/src/com/android/tv/tuner/exoplayer/buffer/SimpleSampleBuffer.java b/tuner/src/com/android/tv/tuner/exoplayer/buffer/SimpleSampleBuffer.java
new file mode 100644
index 00000000..4c6260bf
--- /dev/null
+++ b/tuner/src/com/android/tv/tuner/exoplayer/buffer/SimpleSampleBuffer.java
@@ -0,0 +1,177 @@
+/*
+ * Copyright (C) 2015 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.android.tv.tuner.exoplayer.buffer;
+
+import android.os.ConditionVariable;
+import android.support.annotation.NonNull;
+import com.android.tv.common.SoftPreconditions;
+import com.android.tv.tuner.exoplayer.SampleExtractor;
+import com.android.tv.tuner.tvinput.PlaybackBufferListener;
+import com.google.android.exoplayer.C;
+import com.google.android.exoplayer.MediaFormat;
+import com.google.android.exoplayer.SampleHolder;
+import com.google.android.exoplayer.SampleSource;
+import java.io.IOException;
+import java.util.List;
+
+/**
+ * Handles I/O for {@link SampleExtractor} when physical storage based buffer is not used. Trickplay
+ * is disabled.
+ */
+public class SimpleSampleBuffer implements BufferManager.SampleBuffer {
+    private final SamplePool mSamplePool = new SamplePool();
+    private SampleQueue[] mPlayingSampleQueues;
+    private long mLastBufferedPositionUs = C.UNKNOWN_TIME_US;
+
+    private volatile boolean mEos;
+
+    public SimpleSampleBuffer(PlaybackBufferListener bufferListener) {
+        if (bufferListener != null) {
+            // Disables trickplay.
+            bufferListener.onBufferStateChanged(false);
+        }
+    }
+
+    @Override
+    public synchronized void init(
+            @NonNull List<String> ids, @NonNull List<MediaFormat> mediaFormats) {
+        int trackCount = ids.size();
+        mPlayingSampleQueues = new SampleQueue[trackCount];
+        for (int i = 0; i < trackCount; i++) {
+            mPlayingSampleQueues[i] = null;
+        }
+    }
+
+    @Override
+    public void setEos() {
+        mEos = true;
+    }
+
+    private boolean reachedEos() {
+        return mEos;
+    }
+
+    @Override
+    public void selectTrack(int index) {
+        synchronized (this) {
+            if (mPlayingSampleQueues[index] == null) {
+                mPlayingSampleQueues[index] = new SampleQueue(mSamplePool);
+            } else {
+                mPlayingSampleQueues[index].clear();
+            }
+        }
+    }
+
+    @Override
+    public void deselectTrack(int index) {
+        synchronized (this) {
+            if (mPlayingSampleQueues[index] != null) {
+                mPlayingSampleQueues[index].clear();
+                mPlayingSampleQueues[index] = null;
+            }
+        }
+    }
+
+    @Override
+    public synchronized long getBufferedPositionUs() {
+        Long result = null;
+        for (SampleQueue queue : mPlayingSampleQueues) {
+            if (queue == null) {
+                continue;
+            }
+            Long lastQueuedSamplePositionUs = queue.getLastQueuedPositionUs();
+            if (lastQueuedSamplePositionUs == null) {
+                // No sample has been queued.
+                result = mLastBufferedPositionUs;
+                continue;
+            }
+            if (result == null || result > lastQueuedSamplePositionUs) {
+                result = lastQueuedSamplePositionUs;
+            }
+        }
+        if (result == null) {
+            return mLastBufferedPositionUs;
+        }
+        return (mLastBufferedPositionUs = result);
+    }
+
+    @Override
+    public synchronized int readSample(int track, SampleHolder sampleHolder) {
+        SampleQueue queue = mPlayingSampleQueues[track];
+        SoftPreconditions.checkNotNull(queue);
+        int result = queue == null ? SampleSource.NOTHING_READ : queue.dequeueSample(sampleHolder);
+        if (result != SampleSource.SAMPLE_READ && reachedEos()) {
+            return SampleSource.END_OF_STREAM;
+        }
+        return result;
+    }
+
+    @Override
+    public void writeSample(int index, SampleHolder sample, ConditionVariable conditionVariable)
+            throws IOException {
+        sample.data.position(0).limit(sample.size);
+        SampleHolder sampleToQueue = mSamplePool.acquireSample(sample.size);
+        sampleToQueue.size = sample.size;
+        sampleToQueue.clearData();
+        sampleToQueue.data.put(sample.data);
+        sampleToQueue.timeUs = sample.timeUs;
+        sampleToQueue.flags = sample.flags;
+
+        synchronized (this) {
+            if (mPlayingSampleQueues[index] != null) {
+                mPlayingSampleQueues[index].queueSample(sampleToQueue);
+            }
+        }
+    }
+
+    @Override
+    public boolean isWriteSpeedSlow(int sampleSize, long durationNs) {
+        // Since SimpleSampleBuffer write samples only to memory (not to physical storage),
+        // write speed is always fine.
+        return false;
+    }
+
+    @Override
+    public void handleWriteSpeedSlow() {
+        // no-op
+    }
+
+    @Override
+    public synchronized boolean continueBuffering(long positionUs) {
+        for (SampleQueue queue : mPlayingSampleQueues) {
+            if (queue == null) {
+                continue;
+            }
+            if (queue.getLastQueuedPositionUs() == null
+                    || positionUs > queue.getLastQueuedPositionUs()) {
+                // No more buffered data.
+                return false;
+            }
+        }
+        return true;
+    }
+
+    @Override
+    public void seekTo(long positionUs) {
+        // Not used.
+    }
+
+    @Override
+    public void release() {
+        // Not used.
+    }
+}