Enhance SampleQueue/RollingSampleBuffer to support other use cases.

- This is a step toward hopefully converging HLS and CHUNK packages.
- Add support for encrypted samples.
- Add support for appending from a DataSource.

library/src/main/java/com/google/android/exoplayer/hls/parser/AdtsReader.java

@@ -88,7 +88,7 @@ import java.util.Collections;
           appendData(data, bytesToRead);
           bytesRead += bytesToRead;
           if (bytesRead == sampleSize) {
-            commitSample(true);
+            commitSample(C.SAMPLE_FLAG_SYNC);
             timeUs += frameDurationUs;
             bytesRead = 0;
             state = STATE_FINDING_SYNC;

library/src/main/java/com/google/android/exoplayer/hls/parser/H264Reader.java

@@ -15,6 +15,7 @@
  */
 package com.google.android.exoplayer.hls.parser;
 
+import com.google.android.exoplayer.C;
 import com.google.android.exoplayer.MediaFormat;
 import com.google.android.exoplayer.mp4.Mp4Util;
 import com.google.android.exoplayer.upstream.BufferPool;
@@ -88,7 +89,7 @@ import java.util.List;
               if (isKeyframe && !hasMediaFormat() && sps.isCompleted() && pps.isCompleted()) {
                 parseMediaFormat(sps, pps);
               }
-              commitSample(isKeyframe, nalUnitOffsetInData);
+              commitSample(isKeyframe ? C.SAMPLE_FLAG_SYNC : 0, nalUnitOffsetInData);
             }
             startSample(pesTimeUs, nalUnitOffsetInData);
             isKeyframe = false;

library/src/main/java/com/google/android/exoplayer/hls/parser/Id3Reader.java

@@ -15,6 +15,7 @@
  */
 package com.google.android.exoplayer.hls.parser;
 
+import com.google.android.exoplayer.C;
 import com.google.android.exoplayer.MediaFormat;
 import com.google.android.exoplayer.upstream.BufferPool;
 import com.google.android.exoplayer.util.ParsableByteArray;
@@ -41,7 +42,7 @@ import com.google.android.exoplayer.util.ParsableByteArray;
 
   @Override
   public void packetFinished() {
-    commitSample(true);
+    commitSample(C.SAMPLE_FLAG_SYNC);
   }
 
 }

library/src/main/java/com/google/android/exoplayer/hls/parser/SampleQueue.java

@@ -19,8 +19,11 @@ import com.google.android.exoplayer.C;
 import com.google.android.exoplayer.MediaFormat;
 import com.google.android.exoplayer.SampleHolder;
 import com.google.android.exoplayer.upstream.BufferPool;
+import com.google.android.exoplayer.upstream.DataSource;
 import com.google.android.exoplayer.util.ParsableByteArray;
 
+import java.io.IOException;
+
 /**
  * Wraps a {@link RollingSampleBuffer}, adding higher level functionality such as enforcing that
  * the first sample returned from the queue is a keyframe, allowing splicing to another queue, and
@@ -186,16 +189,24 @@ import com.google.android.exoplayer.util.ParsableByteArray;
     rollingBuffer.startSample(sampleTimeUs, offset);
   }
 
+  protected int appendData(DataSource dataSource, int length) throws IOException {
+    return rollingBuffer.appendData(dataSource, length);
+  }
+
   protected void appendData(ParsableByteArray buffer, int length) {
     rollingBuffer.appendData(buffer, length);
   }
 
-  protected void commitSample(boolean isKeyframe) {
-    commitSample(isKeyframe, 0);
+  protected void commitSample(int flags) {
+    commitSample(flags, 0, null);
+  }
+
+  protected void commitSample(int flags, int offset) {
+    commitSample(flags, offset, null);
   }
 
-  protected void commitSample(boolean isKeyframe, int offset) {
-    rollingBuffer.commitSample(isKeyframe, offset);
+  protected void commitSample(int flags, int offset, byte[] encryptionKey) {
+    rollingBuffer.commitSample(flags, offset, encryptionKey);
     writingSample = false;
   }
 

library/src/main/java/com/google/android/exoplayer/hls/parser/SeiReader.java

@@ -15,6 +15,7 @@
  */
 package com.google.android.exoplayer.hls.parser;
 
+import com.google.android.exoplayer.C;
 import com.google.android.exoplayer.MediaFormat;
 import com.google.android.exoplayer.text.eia608.Eia608Parser;
 import com.google.android.exoplayer.upstream.BufferPool;
@@ -59,7 +60,7 @@ import com.google.android.exoplayer.util.ParsableByteArray;
       if (Eia608Parser.isSeiMessageEia608(payloadType, payloadSize, seiBuffer)) {
         startSample(pesTimeUs);
         appendData(seiBuffer, payloadSize);
-        commitSample(true);
+        commitSample(C.SAMPLE_FLAG_SYNC);
       } else {
         seiBuffer.skip(payloadSize);
       }