Merge seek/playback positions in ChunkSource interface.

library/src/androidTest/java/com/google/android/exoplayer/dash/DashChunkSourceTest.java

@@ -128,7 +128,7 @@ public class DashChunkSourceTest extends InstrumentationTestCase {
     ChunkOperationHolder out = new ChunkOperationHolder();
 
     // request first chunk; should get back initialization chunk
-    chunkSource.getChunkOperation(queue, 0, 0, out);
+    chunkSource.getChunkOperation(queue,  0, out);
 
     assertNotNull(out.chunk);
     assertNotNull(((InitializationChunk) out.chunk).dataSpec);
@@ -386,7 +386,7 @@ public class DashChunkSourceTest extends InstrumentationTestCase {
   private static void checkLiveEdgeConsistency(DashChunkSource chunkSource, List<MediaChunk> queue,
       ChunkOperationHolder out, long seekPositionMs, long availableRangeStartMs,
       long availableRangeEndMs, long chunkStartTimeMs, long chunkEndTimeMs) {
-    chunkSource.getChunkOperation(queue, seekPositionMs * 1000, 0, out);
+    chunkSource.getChunkOperation(queue, seekPositionMs * 1000, out);
     TimeRange availableRange = chunkSource.getAvailableRange();
     checkAvailableRange(availableRange, availableRangeStartMs * 1000, availableRangeEndMs * 1000);
     if (chunkStartTimeMs < availableRangeEndMs) {
@@ -487,7 +487,7 @@ public class DashChunkSourceTest extends InstrumentationTestCase {
 
     // request "eleventh" chunk; this chunk isn't available yet, so we should get null
     out.chunk = null;
-    chunkSource.getChunkOperation(queue, seekPositionMs * 1000, 0, out);
+    chunkSource.getChunkOperation(queue, seekPositionMs * 1000, out);
     assertNull(out.chunk);
   }
 

library/src/main/java/com/google/android/exoplayer/chunk/ChunkSampleSource.java

@@ -533,7 +533,8 @@ public class ChunkSampleSource implements SampleSource, SampleSourceReader, Load
   private void doChunkOperation() {
     currentLoadableHolder.endOfStream = false;
     currentLoadableHolder.queueSize = readOnlyMediaChunks.size();
-    chunkSource.getChunkOperation(readOnlyMediaChunks, pendingResetPositionUs, downstreamPositionUs,
+    chunkSource.getChunkOperation(readOnlyMediaChunks,
+        pendingResetPositionUs != NO_RESET_PENDING ? pendingResetPositionUs : downstreamPositionUs,
         currentLoadableHolder);
     loadingFinished = currentLoadableHolder.endOfStream;
   }

library/src/main/java/com/google/android/exoplayer/chunk/ChunkSource.java

@@ -92,9 +92,9 @@ public interface ChunkSource {
    * This method should only be called when the source is enabled.
    *
    * @param queue A representation of the currently buffered {@link MediaChunk}s.
-   * @param seekPositionUs If the queue is empty, this parameter must specify the seek position. If
+   * @param playbackPositionUs The current playback position. If the queue is empty then this
-   *     the queue is non-empty then this parameter is ignored.
+   *     parameter is the position from which playback is expected to start (or restart) and hence
-   * @param playbackPositionUs The current playback position.
+   *     should be interpreted as a seek position.
    * @param out A holder for the next operation, whose {@link ChunkOperationHolder#endOfStream} is
    *     initially set to false, whose {@link ChunkOperationHolder#queueSize} is initially equal to
    *     the length of the queue, and whose {@link ChunkOperationHolder#chunk} is initially equal to
@@ -103,8 +103,8 @@ public interface ChunkSource {
    *     unchanged. Note that leaving the chunk unchanged is both preferred and more efficient than
    *     replacing it with a new but identical chunk.
    */
-  void getChunkOperation(List<? extends MediaChunk> queue, long seekPositionUs,
+  void getChunkOperation(List<? extends MediaChunk> queue, long playbackPositionUs,
-      long playbackPositionUs, ChunkOperationHolder out);
+      ChunkOperationHolder out);
 
   /**
    * Invoked when the {@link ChunkSampleSource} has finished loading a chunk obtained from this

library/src/main/java/com/google/android/exoplayer/chunk/SingleSampleChunkSource.java

@@ -80,8 +80,8 @@ public final class SingleSampleChunkSource implements ChunkSource {
   }
 
   @Override
-  public void getChunkOperation(List<? extends MediaChunk> queue, long seekPositionUs,
+  public void getChunkOperation(List<? extends MediaChunk> queue, long playbackPositionUs,
-      long playbackPositionUs, ChunkOperationHolder out) {
+      ChunkOperationHolder out) {
     if (!queue.isEmpty()) {
       // We've already provided the single sample.
       out.endOfStream = true;

library/src/main/java/com/google/android/exoplayer/dash/DashChunkSource.java

@@ -346,8 +346,8 @@ public class DashChunkSource implements ChunkSource, Output {
   }
 
   @Override
-  public final void getChunkOperation(List<? extends MediaChunk> queue, long seekPositionUs,
+  public final void getChunkOperation(List<? extends MediaChunk> queue, long playbackPositionUs,
-      long playbackPositionUs, ChunkOperationHolder out) {
+      ChunkOperationHolder out) {
     if (fatalError != null) {
       out.chunk = null;
       return;
@@ -389,16 +389,16 @@ public class DashChunkSource implements ChunkSource, Output {
         if (startAtLiveEdge) {
           // We want live streams to start at the live edge instead of the beginning of the
           // manifest
-          seekPositionUs = Math.max(availableRangeValues[0],
+          playbackPositionUs = Math.max(availableRangeValues[0],
               availableRangeValues[1] - liveEdgeLatencyUs);
         } else {
           // we subtract 1 from the upper bound because it's exclusive for that bound
-          seekPositionUs = Math.min(seekPositionUs, availableRangeValues[1] - 1);
+          playbackPositionUs = Math.min(playbackPositionUs, availableRangeValues[1] - 1);
-          seekPositionUs = Math.max(seekPositionUs, availableRangeValues[0]);
+          playbackPositionUs = Math.max(playbackPositionUs, availableRangeValues[0]);
         }
       }
 
-      periodHolder = findPeriodHolder(seekPositionUs);
+      periodHolder = findPeriodHolder(playbackPositionUs);
       startingNewPeriod = true;
     } else {
       if (startAtLiveEdge) {
@@ -476,7 +476,7 @@ public class DashChunkSource implements ChunkSource, Output {
       return;
     }
 
-    int segmentNum = queue.isEmpty() ? representationHolder.getSegmentNum(seekPositionUs)
+    int segmentNum = queue.isEmpty() ? representationHolder.getSegmentNum(playbackPositionUs)
           : startingNewPeriod ? representationHolder.getFirstAvailableSegmentNum()
           : queue.get(out.queueSize - 1).chunkIndex + 1;
     Chunk nextMediaChunk = newMediaChunk(periodHolder, representationHolder, dataSource,

library/src/main/java/com/google/android/exoplayer/smoothstreaming/SmoothStreamingChunkSource.java

@@ -236,8 +236,8 @@ public class SmoothStreamingChunkSource implements ChunkSource,
   }
 
   @Override
-  public final void getChunkOperation(List<? extends MediaChunk> queue, long seekPositionUs,
+  public final void getChunkOperation(List<? extends MediaChunk> queue, long playbackPositionUs,
-      long playbackPositionUs, ChunkOperationHolder out) {
+      ChunkOperationHolder out) {
     if (fatalError != null) {
       out.chunk = null;
       return;
@@ -281,9 +281,9 @@ public class SmoothStreamingChunkSource implements ChunkSource,
     int chunkIndex;
     if (queue.isEmpty()) {
       if (live) {
-        seekPositionUs = getLiveSeekPosition(currentManifest, liveEdgeLatencyUs);
+        playbackPositionUs = getLiveSeekPosition(currentManifest, liveEdgeLatencyUs);
       }
-      chunkIndex = streamElement.getChunkIndex(seekPositionUs);
+      chunkIndex = streamElement.getChunkIndex(playbackPositionUs);
     } else {
       MediaChunk previous = queue.get(out.queueSize - 1);
       chunkIndex = previous.chunkIndex + 1 - currentManifestChunkOffset;