Merge fMP4/H264 and WebM/VP9 DASH implementations.

52a300f1 · Oliver Woodman · 1ddd5c6e · 52a300f1 · 52a300f1 · 52a300f1
Commit 52a300f1 authored Sep 08, 2014 by Oliver Woodman
Showing with 187 additions and 480 deletions
demo/src/main/java/com/google/android/exoplayer/demo/full/player/DashVodRendererBuilder.java
demo/src/main/java/com/google/android/exoplayer/demo/simple/DashVodRendererBuilder.java
library/src/main/java/com/google/android/exoplayer/chunk/Mp4MediaChunk.java
library/src/main/java/com/google/android/exoplayer/chunk/WebmMediaChunk.java
library/src/main/java/com/google/android/exoplayer/dash/DashMp4ChunkSource.java → library/src/main/java/com/google/android/exoplayer/dash/DashChunkSource.java
library/src/main/java/com/google/android/exoplayer/dash/DashWebmChunkSource.java
library/src/main/java/com/google/android/exoplayer/parser/Extractor.java
library/src/main/java/com/google/android/exoplayer/parser/mp4/FragmentedMp4Extractor.java
library/src/main/java/com/google/android/exoplayer/parser/webm/DefaultWebmExtractor.java
library/src/main/java/com/google/android/exoplayer/parser/webm/WebmExtractor.java
library/src/main/java/com/google/android/exoplayer/smoothstreaming/SmoothStreamingChunkSource.java
--- a/demo/src/main/java/com/google/android/exoplayer/demo/full/player/DashVodRendererBuilder.java
+++ b/demo/src/main/java/com/google/android/exoplayer/demo/full/player/DashVodRendererBuilder.java
@@ -28,8 +28,7 @@ import com.google.android.exoplayer.chunk.Format;
 import com.google.android.exoplayer.chunk.FormatEvaluator;
 import com.google.android.exoplayer.chunk.FormatEvaluator.AdaptiveEvaluator;
 import com.google.android.exoplayer.chunk.MultiTrackChunkSource;
-import com.google.android.exoplayer.dash.DashMp4ChunkSource;
+import com.google.android.exoplayer.dash.DashChunkSource;
-import com.google.android.exoplayer.dash.DashWebmChunkSource;
 import com.google.android.exoplayer.dash.mpd.AdaptationSet;
 import com.google.android.exoplayer.dash.mpd.MediaPresentationDescription;
 import com.google.android.exoplayer.dash.mpd.MediaPresentationDescriptionFetcher;
@@ -163,14 +162,8 @@ public class DashVodRendererBuilder implements RendererBuilder,
    DataSource videoDataSource = new HttpDataSource(userAgent, null, bandwidthMeter);
    ChunkSource videoChunkSource;
    String mimeType = videoRepresentations[0].format.mimeType;
-    if (mimeType.equals(MimeTypes.VIDEO_MP4)) {
+    if (mimeType.equals(MimeTypes.VIDEO_MP4) || mimeType.equals(MimeTypes.VIDEO_WEBM)) {
-      videoChunkSource = new DashMp4ChunkSource(videoDataSource,
+      videoChunkSource = new DashChunkSource(videoDataSource,
-          new AdaptiveEvaluator(bandwidthMeter), videoRepresentations);
-    } else if (mimeType.equals(MimeTypes.VIDEO_WEBM)) {
-      // TODO: Figure out how to query supported vpX resolutions. For now, restrict to standard
-      // definition streams.
-      videoRepresentations = getSdRepresentations(videoRepresentations);
-      videoChunkSource = new DashWebmChunkSource(videoDataSource,
          new AdaptiveEvaluator(bandwidthMeter), videoRepresentations);
    } else {
      throw new IllegalStateException("Unexpected mime type: " + mimeType);
@@ -200,7 +193,7 @@ public class DashVodRendererBuilder implements RendererBuilder,
        Format format = representation.format;
        audioTrackNames[i] = format.id + " (" + format.numChannels + "ch, " +
            format.audioSamplingRate + "Hz)";
-        audioChunkSources[i] = new DashMp4ChunkSource(audioDataSource,
+        audioChunkSources[i] = new DashChunkSource(audioDataSource,
            audioEvaluator, representation);
      }
      audioChunkSource = new MultiTrackChunkSource(audioChunkSources);

--- a/demo/src/main/java/com/google/android/exoplayer/demo/simple/DashVodRendererBuilder.java
+++ b/demo/src/main/java/com/google/android/exoplayer/demo/simple/DashVodRendererBuilder.java
@@ -26,7 +26,7 @@ import com.google.android.exoplayer.chunk.ChunkSource;
 import com.google.android.exoplayer.chunk.Format;
 import com.google.android.exoplayer.chunk.FormatEvaluator;
 import com.google.android.exoplayer.chunk.FormatEvaluator.AdaptiveEvaluator;
-import com.google.android.exoplayer.dash.DashMp4ChunkSource;
+import com.google.android.exoplayer.dash.DashChunkSource;
 import com.google.android.exoplayer.dash.mpd.AdaptationSet;
 import com.google.android.exoplayer.dash.mpd.MediaPresentationDescription;
 import com.google.android.exoplayer.dash.mpd.MediaPresentationDescriptionFetcher;
@@ -116,7 +116,7 @@ import java.util.ArrayList;
    // Build the video renderer.
    DataSource videoDataSource = new HttpDataSource(userAgent, null, bandwidthMeter);
-    ChunkSource videoChunkSource = new DashMp4ChunkSource(videoDataSource,
+    ChunkSource videoChunkSource = new DashChunkSource(videoDataSource,
        new AdaptiveEvaluator(bandwidthMeter), videoRepresentations);
    ChunkSampleSource videoSampleSource = new ChunkSampleSource(videoChunkSource, loadControl,
        VIDEO_BUFFER_SEGMENTS * BUFFER_SEGMENT_SIZE, true);
@@ -125,7 +125,7 @@ import java.util.ArrayList;
    // Build the audio renderer.
    DataSource audioDataSource = new HttpDataSource(userAgent, null, bandwidthMeter);
-    ChunkSource audioChunkSource = new DashMp4ChunkSource(audioDataSource,
+    ChunkSource audioChunkSource = new DashChunkSource(audioDataSource,
        new FormatEvaluator.FixedEvaluator(), audioRepresentation);
    SampleSource audioSampleSource = new ChunkSampleSource(audioChunkSource, loadControl,
        AUDIO_BUFFER_SEGMENTS * BUFFER_SEGMENT_SIZE, true);

--- a/library/src/main/java/com/google/android/exoplayer/chunk/Mp4MediaChunk.java
+++ b/library/src/main/java/com/google/android/exoplayer/chunk/Mp4MediaChunk.java
@@ -18,7 +18,7 @@ package com.google.android.exoplayer.chunk;
 import com.google.android.exoplayer.MediaFormat;
 import com.google.android.exoplayer.ParserException;
 import com.google.android.exoplayer.SampleHolder;
-import com.google.android.exoplayer.parser.mp4.FragmentedMp4Extractor;
+import com.google.android.exoplayer.parser.Extractor;
 import com.google.android.exoplayer.upstream.DataSource;
 import com.google.android.exoplayer.upstream.DataSpec;
 import com.google.android.exoplayer.upstream.NonBlockingInputStream;
@@ -32,7 +32,7 @@ import java.util.UUID;
 */
 public final class Mp4MediaChunk extends MediaChunk {
-  private final FragmentedMp4Extractor extractor;
+  private final Extractor extractor;
  private final boolean maybeSelfContained;
  private final long sampleOffsetUs;
@@ -57,7 +57,7 @@ public final class Mp4MediaChunk extends MediaChunk {
   */
  public Mp4MediaChunk(DataSource dataSource, DataSpec dataSpec, Format format,
      int trigger, long startTimeUs, long endTimeUs, int nextChunkIndex,
-      FragmentedMp4Extractor extractor, boolean maybeSelfContained, long sampleOffsetUs) {
+      Extractor extractor, boolean maybeSelfContained, long sampleOffsetUs) {
    super(dataSource, dataSpec, format, trigger, startTimeUs, endTimeUs, nextChunkIndex);
    this.extractor = extractor;
    this.maybeSelfContained = maybeSelfContained;
@@ -89,7 +89,7 @@ public final class Mp4MediaChunk extends MediaChunk {
        NonBlockingInputStream inputStream = getNonBlockingInputStream();
        Assertions.checkState(inputStream != null);
        int result = extractor.read(inputStream, null);
-        prepared = (result & FragmentedMp4Extractor.RESULT_NEED_SAMPLE_HOLDER) != 0;
+        prepared = (result & Extractor.RESULT_NEED_SAMPLE_HOLDER) != 0;
      } else {
        // We know there isn't a moov atom. The extractor must have parsed one from a separate
        // initialization chunk.
@@ -107,7 +107,7 @@ public final class Mp4MediaChunk extends MediaChunk {
  public boolean sampleAvailable() throws ParserException {
    NonBlockingInputStream inputStream = getNonBlockingInputStream();
    int result = extractor.read(inputStream, null);
-    return (result & FragmentedMp4Extractor.RESULT_NEED_SAMPLE_HOLDER) != 0;
+    return (result & Extractor.RESULT_NEED_SAMPLE_HOLDER) != 0;
  }
  @Override
@@ -115,7 +115,7 @@ public final class Mp4MediaChunk extends MediaChunk {
    NonBlockingInputStream inputStream = getNonBlockingInputStream();
    Assertions.checkState(inputStream != null);
    int result = extractor.read(inputStream, holder);
-    boolean sampleRead = (result & FragmentedMp4Extractor.RESULT_READ_SAMPLE) != 0;
+    boolean sampleRead = (result & Extractor.RESULT_READ_SAMPLE) != 0;
    if (sampleRead) {
      holder.timeUs -= sampleOffsetUs;
    }

--- a/library/src/main/java/com/google/android/exoplayer/chunk/WebmMediaChunk.java
+++ b/library/src/main/java/com/google/android/exoplayer/chunk/WebmMediaChunk.java
-/*
- * Copyright (C) 2014 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.google.android.exoplayer.chunk;
-import com.google.android.exoplayer.MediaFormat;
-import com.google.android.exoplayer.ParserException;
-import com.google.android.exoplayer.SampleHolder;
-import com.google.android.exoplayer.parser.webm.WebmExtractor;
-import com.google.android.exoplayer.upstream.DataSource;
-import com.google.android.exoplayer.upstream.DataSpec;
-import com.google.android.exoplayer.upstream.NonBlockingInputStream;
-import com.google.android.exoplayer.util.Assertions;
-import java.util.Map;
-import java.util.UUID;
-/**
- * A WebM {@link MediaChunk}.
- */
-public final class WebmMediaChunk extends MediaChunk {
-  private final WebmExtractor extractor;
-  /**
-   * @param dataSource A {@link DataSource} for loading the data.
-   * @param dataSpec Defines the data to be loaded.
-   * @param format The format of the stream to which this chunk belongs.
-   * @param extractor The extractor that will be used to extract the samples.
-   * @param trigger The reason for this chunk being selected.
-   * @param startTimeUs The start time of the media contained by the chunk, in microseconds.
-   * @param endTimeUs The end time of the media contained by the chunk, in microseconds.
-   * @param nextChunkIndex The index of the next chunk, or -1 if this is the last chunk.
-   */
-  public WebmMediaChunk(DataSource dataSource, DataSpec dataSpec, Format format,
-      int trigger, WebmExtractor extractor, long startTimeUs, long endTimeUs,
-      int nextChunkIndex) {
-    super(dataSource, dataSpec, format, trigger, startTimeUs, endTimeUs, nextChunkIndex);
-    this.extractor = extractor;
-  }
-  @Override
-  public void seekToStart() {
-    seekTo(0, false);
-  }
-  @Override
-  public boolean seekTo(long positionUs, boolean allowNoop) {
-    boolean isDiscontinuous = extractor.seekTo(positionUs, allowNoop);
-    if (isDiscontinuous) {
-      resetReadPosition();
-    }
-    return isDiscontinuous;
-  }
-  @Override
-  public boolean prepare() {
-    return true;
-  }
-  @Override
-  public boolean sampleAvailable() throws ParserException {
-    NonBlockingInputStream inputStream = getNonBlockingInputStream();
-    int result = extractor.read(inputStream, null);
-    return (result & WebmExtractor.RESULT_NEED_SAMPLE_HOLDER) != 0;
-  }
-  @Override
-  public boolean read(SampleHolder holder) {
-    NonBlockingInputStream inputStream = getNonBlockingInputStream();
-    Assertions.checkState(inputStream != null);
-    int result = extractor.read(inputStream, holder);
-    return (result & WebmExtractor.RESULT_READ_SAMPLE) != 0;
-  }
-  @Override
-  public MediaFormat getMediaFormat() {
-    return extractor.getFormat();
-  }
-  @Override
-  public Map<UUID, byte[]> getPsshInfo() {
-    // TODO: Add support for Pssh to WebmExtractor
-    return null;
-  }
-}
--- a/library/src/main/java/com/google/android/exoplayer/dash/DashMp4ChunkSource.java
+++ b/library/src/main/java/com/google/android/exoplayer/dash/DashMp4ChunkSource.java
@@ -29,10 +29,13 @@ import com.google.android.exoplayer.chunk.MediaChunk;
 import com.google.android.exoplayer.chunk.Mp4MediaChunk;
 import com.google.android.exoplayer.dash.mpd.RangedUri;
 import com.google.android.exoplayer.dash.mpd.Representation;
+import com.google.android.exoplayer.parser.Extractor;
 import com.google.android.exoplayer.parser.mp4.FragmentedMp4Extractor;
+import com.google.android.exoplayer.parser.webm.WebmExtractor;
 import com.google.android.exoplayer.upstream.DataSource;
 import com.google.android.exoplayer.upstream.DataSpec;
 import com.google.android.exoplayer.upstream.NonBlockingInputStream;
+import com.google.android.exoplayer.util.MimeTypes;
 import android.net.Uri;
@@ -42,9 +45,11 @@ import java.util.HashMap;
 import java.util.List;
 /**
- * An {@link ChunkSource} for Mp4 DASH streams.
+ * An {@link ChunkSource} for DASH streams.
+ * <p>
+ * This implementation currently supports fMP4 and webm.
 */
-public class DashMp4ChunkSource implements ChunkSource {
+public class DashChunkSource implements ChunkSource {
  private final TrackInfo trackInfo;
  private final DataSource dataSource;
@@ -55,7 +60,7 @@ public class DashMp4ChunkSource implements ChunkSource {
  private final Format[] formats;
  private final HashMap<String, Representation> representations;
-  private final HashMap<String, FragmentedMp4Extractor> extractors;
+  private final HashMap<String, Extractor> extractors;
  private final HashMap<String, DashSegmentIndex> segmentIndexes;
  private boolean lastChunkWasInitialization;
@@ -65,12 +70,12 @@ public class DashMp4ChunkSource implements ChunkSource {
   * @param evaluator Selects from the available formats.
   * @param representations The representations to be considered by the source.
   */
-  public DashMp4ChunkSource(DataSource dataSource, FormatEvaluator evaluator,
+  public DashChunkSource(DataSource dataSource, FormatEvaluator evaluator,
      Representation... representations) {
    this.dataSource = dataSource;
    this.evaluator = evaluator;
    this.formats = new Format[representations.length];
-    this.extractors = new HashMap<String, FragmentedMp4Extractor>();
+    this.extractors = new HashMap<String, Extractor>();
    this.segmentIndexes = new HashMap<String, DashSegmentIndex>();
    this.representations = new HashMap<String, Representation>();
    this.trackInfo = new TrackInfo(representations[0].format.mimeType,
@@ -82,7 +87,9 @@ public class DashMp4ChunkSource implements ChunkSource {
      formats[i] = representations[i].format;
      maxWidth = Math.max(formats[i].width, maxWidth);
      maxHeight = Math.max(formats[i].height, maxHeight);
-      extractors.put(formats[i].id, new FragmentedMp4Extractor());
+      Extractor extractor = formats[i].mimeType.startsWith(MimeTypes.VIDEO_WEBM)
+          ? new WebmExtractor() : new FragmentedMp4Extractor();
+      extractors.put(formats[i].id, extractor);
      this.representations.put(formats[i].id, representations[i]);
      DashSegmentIndex segmentIndex = representations[i].getIndex();
      if (segmentIndex != null) {
@@ -142,7 +149,7 @@ public class DashMp4ChunkSource implements ChunkSource {
    }
    Representation selectedRepresentation = representations.get(selectedFormat.id);
-    FragmentedMp4Extractor extractor = extractors.get(selectedRepresentation.format.id);
+    Extractor extractor = extractors.get(selectedRepresentation.format.id);
    RangedUri pendingInitializationUri = null;
    RangedUri pendingIndexUri = null;
@@ -191,35 +198,39 @@ public class DashMp4ChunkSource implements ChunkSource {
  }
  private Chunk newInitializationChunk(RangedUri initializationUri, RangedUri indexUri,
-      Representation representation, FragmentedMp4Extractor extractor, DataSource dataSource,
+      Representation representation, Extractor extractor, DataSource dataSource,
      int trigger) {
-    int expectedExtractorResult = FragmentedMp4Extractor.RESULT_END_OF_STREAM;
+    int expectedExtractorResult = Extractor.RESULT_END_OF_STREAM;
    long indexAnchor = 0;
    RangedUri requestUri;
    if (initializationUri != null) {
      // It's common for initialization and index data to be stored adjacently. Attempt to merge
      // the two requests together to request both at once.
-      expectedExtractorResult |= FragmentedMp4Extractor.RESULT_READ_INIT;
+      expectedExtractorResult |= Extractor.RESULT_READ_INIT;
      requestUri = initializationUri.attemptMerge(indexUri);
      if (requestUri != null) {
-        expectedExtractorResult |= FragmentedMp4Extractor.RESULT_READ_INDEX;
+        expectedExtractorResult |= Extractor.RESULT_READ_INDEX;
-        indexAnchor = indexUri.start + indexUri.length;
+        if (extractor.hasRelativeIndexOffsets()) {
+          indexAnchor = indexUri.start + indexUri.length;
+        }
      } else {
        requestUri = initializationUri;
      }
    } else {
      requestUri = indexUri;
-      indexAnchor = indexUri.start + indexUri.length;
+      if (extractor.hasRelativeIndexOffsets()) {
-      expectedExtractorResult |= FragmentedMp4Extractor.RESULT_READ_INDEX;
+        indexAnchor = indexUri.start + indexUri.length;
+      }
+      expectedExtractorResult |= Extractor.RESULT_READ_INDEX;
    }
    DataSpec dataSpec = new DataSpec(requestUri.getUri(), requestUri.start, requestUri.length,
        representation.getCacheKey());
-    return new InitializationMp4Loadable(dataSource, dataSpec, trigger, representation.format,
+    return new InitializationLoadable(dataSource, dataSpec, trigger, representation.format,
        extractor, expectedExtractorResult, indexAnchor);
  }
  private Chunk newMediaChunk(Representation representation, DashSegmentIndex segmentIndex,
-      FragmentedMp4Extractor extractor, DataSource dataSource, int segmentNum, int trigger) {
+      Extractor extractor, DataSource dataSource, int segmentNum, int trigger) {
    int lastSegmentNum = segmentIndex.getLastSegmentNum();
    int nextSegmentNum = segmentNum == lastSegmentNum ? -1 : segmentNum + 1;
    long startTimeUs = segmentIndex.getTimeUs(segmentNum);
@@ -232,15 +243,15 @@ public class DashMp4ChunkSource implements ChunkSource {
        endTimeUs, nextSegmentNum, extractor, false, 0);
  }
-  private class InitializationMp4Loadable extends Chunk {
+  private class InitializationLoadable extends Chunk {
-    private final FragmentedMp4Extractor extractor;
+    private final Extractor extractor;
    private final int expectedExtractorResult;
    private final long indexAnchor;
    private final Uri uri;
-    public InitializationMp4Loadable(DataSource dataSource, DataSpec dataSpec, int trigger,
+    public InitializationLoadable(DataSource dataSource, DataSpec dataSpec, int trigger,
-        Format format, FragmentedMp4Extractor extractor, int expectedExtractorResult,
+        Format format, Extractor extractor, int expectedExtractorResult,
        long indexAnchor) {
      super(dataSource, dataSpec, format, trigger);
      this.extractor = extractor;
@@ -256,7 +267,7 @@ public class DashMp4ChunkSource implements ChunkSource {
        throw new ParserException("Invalid extractor result. Expected "
            + expectedExtractorResult + ", got " + result);
      }
-      if ((result & FragmentedMp4Extractor.RESULT_READ_INDEX) != 0) {
+      if ((result & Extractor.RESULT_READ_INDEX) != 0) {
        segmentIndexes.put(format.id,
            new DashWrappingSegmentIndex(extractor.getIndex(), uri, indexAnchor));
      }

--- a/library/src/main/java/com/google/android/exoplayer/dash/DashWebmChunkSource.java
+++ b/library/src/main/java/com/google/android/exoplayer/dash/DashWebmChunkSource.java
--- a/library/src/main/java/com/google/android/exoplayer/parser/Extractor.java
+++ b/library/src/main/java/com/google/android/exoplayer/parser/Extractor.java
+/*
+ * Copyright (C) 2014 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.google.android.exoplayer.parser;
+import com.google.android.exoplayer.MediaFormat;
+import com.google.android.exoplayer.ParserException;
+import com.google.android.exoplayer.SampleHolder;
+import com.google.android.exoplayer.upstream.NonBlockingInputStream;
+import java.util.Map;
+import java.util.UUID;
+/**
+ * Facilitates extraction of media samples from a container format.
+ */
+public interface Extractor {
+  /**
+   * An attempt to read from the input stream returned insufficient data.
+   */
+  public static final int RESULT_NEED_MORE_DATA = 1;
+  /**
+   * The end of the input stream was reached.
+   */
+  public static final int RESULT_END_OF_STREAM = 2;
+  /**
+   * A media sample was read.
+   */
+  public static final int RESULT_READ_SAMPLE = 4;
+  /**
+   * Initialization data was read. The parsed data can be read using {@link #getFormat()} and
+   * {@link #getPsshInfo}.
+   */
+  public static final int RESULT_READ_INIT = 8;
+  /**
+   * A sidx atom was read. The parsed data can be read using {@link #getIndex()}.
+   */
+  public static final int RESULT_READ_INDEX = 16;
+  /**
+   * The next thing to be read is a sample, but a {@link SampleHolder} was not supplied.
+   */
+  public static final int RESULT_NEED_SAMPLE_HOLDER = 32;
+  /**
+   * Returns the segment index parsed from the stream.
+   *
+   * @return The segment index, or null if a SIDX atom has yet to be parsed.
+   */
+  public SegmentIndex getIndex();
+  /**
+   * Returns true if the offsets in the index returned by {@link #getIndex()} are relative to the
+   * first byte following the initialization data, or false if they are absolute (i.e. relative to
+   * the first byte of the stream).
+   *
+   * @return True if the offsets are relative to the first byte following the initialization data.
+   *     False otherwise.
+   */
+  public boolean hasRelativeIndexOffsets();
+  /**
+   * Returns the format of the samples contained within the media stream.
+   *
+   * @return The sample media format, or null if the format has yet to be parsed.
+   */
+  public MediaFormat getFormat();
+  /**
+   * Returns the pssh information parsed from the stream.
+   *
+   * @return The pssh information. May be null if pssh data has yet to be parsed, or if the stream
+   *     does not contain any pssh data.
+   */
+  public Map<UUID, byte[]> getPsshInfo();
+  /**
+   * Consumes data from a {@link NonBlockingInputStream}.
+   * <p>
+   * The read terminates if the end of the input stream is reached, if an attempt to read from the
+   * input stream returned 0 bytes of data, or if a sample is read. The returned flags indicate
+   * both the reason for termination and data that was parsed during the read.
+   *
+   * @param inputStream The input stream from which data should be read.
+   * @param out A {@link SampleHolder} into which the next sample should be read. If null then
+   *     {@link #RESULT_NEED_SAMPLE_HOLDER} will be returned once a sample has been reached.
+   * @return One or more of the {@code RESULT_*} flags defined in this class.
+   * @throws ParserException If an error occurs parsing the media data.
+   */
+  public int read(NonBlockingInputStream inputStream, SampleHolder out) throws ParserException;
+  /**
+   * Seeks to a position before or equal to the requested time.
+   *
+   * @param seekTimeUs The desired seek time in microseconds.
+   * @param allowNoop Allow the seek operation to do nothing if the seek time is in the current
+   *     fragment run, is equal to or greater than the time of the current sample, and if there
+   *     does not exist a sync frame between these two times.
+   * @return True if the operation resulted in a change of state. False if it was a no-op.
+   */
+  public boolean seekTo(long seekTimeUs, boolean allowNoop);
+}
--- a/library/src/main/java/com/google/android/exoplayer/parser/mp4/FragmentedMp4Extractor.java
+++ b/library/src/main/java/com/google/android/exoplayer/parser/mp4/FragmentedMp4Extractor.java
@@ -18,6 +18,7 @@ package com.google.android.exoplayer.parser.mp4;
 import com.google.android.exoplayer.MediaFormat;
 import com.google.android.exoplayer.ParserException;
 import com.google.android.exoplayer.SampleHolder;
+import com.google.android.exoplayer.parser.Extractor;
 import com.google.android.exoplayer.parser.SegmentIndex;
 import com.google.android.exoplayer.parser.mp4.Atom.ContainerAtom;
 import com.google.android.exoplayer.parser.mp4.Atom.LeafAtom;
@@ -48,7 +49,7 @@ import java.util.UUID;
 * <p>
 * This implementation only supports de-muxed (i.e. single track) streams.
 */
-public final class FragmentedMp4Extractor {
+public final class FragmentedMp4Extractor implements Extractor {
  /**
   * Flag to work around an issue in some video streams where every frame is marked as a sync frame.
@@ -59,32 +60,6 @@ public final class FragmentedMp4Extractor {
   */
  public static final int WORKAROUND_EVERY_VIDEO_FRAME_IS_SYNC_FRAME = 1;
-  /**
-   * An attempt to read from the input stream returned insufficient data.
-   */
-  public static final int RESULT_NEED_MORE_DATA = 1;
-  /**
-   * The end of the input stream was reached.
-   */
-  public static final int RESULT_END_OF_STREAM = 2;
-  /**
-   * A media sample was read.
-   */
-  public static final int RESULT_READ_SAMPLE = 4;
-  /**
-   * A moov atom was read. The parsed data can be read using {@link #getFormat()} and
-   * {@link #getPsshInfo}.
-   */
-  public static final int RESULT_READ_INIT = 8;
-  /**
-   * A sidx atom was read. The parsed data can be read using {@link #getIndex()}.
-   */
-  public static final int RESULT_READ_INDEX = 16;
-  /**
-   * The next thing to be read is a sample, but a {@link SampleHolder} was not supplied.
-   */
-  public static final int RESULT_NEED_SAMPLE_HOLDER = 32;
  private static final int READ_TERMINATING_RESULTS = RESULT_NEED_MORE_DATA | RESULT_END_OF_STREAM
      | RESULT_READ_SAMPLE | RESULT_NEED_SAMPLE_HOLDER;
  private static final byte[] NAL_START_CODE = new byte[] {0, 0, 0, 1};
@@ -197,22 +172,13 @@ public final class FragmentedMp4Extractor {
  }
  /**
-   * Returns the segment index parsed from the stream.
+   * Sideloads track information into the extractor.
-   *
-   * @return The segment index, or null if a SIDX atom has yet to be parsed.
-   */
-  public SegmentIndex getIndex() {
-    return segmentIndex;
-  }
-  /**
-   * Returns the pssh information parsed from the stream.
   *
-   * @return The pssh information. May be null if the MOOV atom has yet to be parsed of if it did
+   * @param track The track to sideload.
-   *     not contain any pssh information.
   */
-  public Map<UUID, byte[]> getPsshInfo() {
+  public void setTrack(Track track) {
-    return psshData.isEmpty() ? null : psshData;
+    this.extendsDefaults = new DefaultSampleValues(0, 0, 0, 0);
+    this.track = track;
  }
  /**
@@ -229,38 +195,27 @@ public final class FragmentedMp4Extractor {
    psshData.put(uuid, data);
  }
-  /**
+  @Override
-   * Returns the format of the samples contained within the media stream.
+  public Map<UUID, byte[]> getPsshInfo() {
-   *
+    return psshData.isEmpty() ? null : psshData;
-   * @return The sample media format, or null if a MOOV atom has yet to be parsed.
-   */
-  public MediaFormat getFormat() {
-    return track == null ? null : track.mediaFormat;
  }
-  /**
+  @Override
-   * Sideloads track information into the extractor.
+  public SegmentIndex getIndex() {
-   *
+    return segmentIndex;
-   * @param track The track to sideload.
-   */
-  public void setTrack(Track track) {
-    this.extendsDefaults = new DefaultSampleValues(0, 0, 0, 0);
-    this.track = track;
  }
-  /**
+  @Override
-   * Consumes data from a {@link NonBlockingInputStream}.
+  public boolean hasRelativeIndexOffsets() {
-   * <p>
+    return true;
-   * The read terminates if the end of the input stream is reached, if an attempt to read from the
+  }
-   * input stream returned 0 bytes of data, or if a sample is read. The returned flags indicate
-   * both the reason for termination and data that was parsed during the read.
+  @Override
-   *
+  public MediaFormat getFormat() {
-   * @param inputStream The input stream from which data should be read.
+    return track == null ? null : track.mediaFormat;
-   * @param out A {@link SampleHolder} into which the next sample should be read. If null then
+  }
-   *     {@link #RESULT_NEED_SAMPLE_HOLDER} will be returned once a sample has been reached.
-   * @return One or more of the {@code RESULT_*} flags defined in this class.
+  @Override
-   * @throws ParserException If an error occurs parsing the media data.
-   */
  public int read(NonBlockingInputStream inputStream, SampleHolder out)
      throws ParserException {
    try {
@@ -287,15 +242,7 @@ public final class FragmentedMp4Extractor {
    }
  }
-  /**
+  @Override
-   * Seeks to a position before or equal to the requested time.
-   *
-   * @param seekTimeUs The desired seek time in microseconds.
-   * @param allowNoop Allow the seek operation to do nothing if the seek time is in the current
-   *     fragment run, is equal to or greater than the time of the current sample, and if there
-   *     does not exist a sync frame between these two times.
-   * @return True if the operation resulted in a change of state. False if it was a no-op.
-   */
  public boolean seekTo(long seekTimeUs, boolean allowNoop) {
    pendingSeekTimeMs = (int) (seekTimeUs / 1000);
    if (allowNoop && fragmentRun != null

--- a/library/src/main/java/com/google/android/exoplayer/parser/webm/DefaultWebmExtractor.java
+++ b/library/src/main/java/com/google/android/exoplayer/parser/webm/DefaultWebmExtractor.java
--- a/library/src/main/java/com/google/android/exoplayer/parser/webm/WebmExtractor.java
+++ b/library/src/main/java/com/google/android/exoplayer/parser/webm/WebmExtractor.java
--- a/library/src/main/java/com/google/android/exoplayer/smoothstreaming/SmoothStreamingChunkSource.java
+++ b/library/src/main/java/com/google/android/exoplayer/smoothstreaming/SmoothStreamingChunkSource.java
@@ -26,6 +26,7 @@ import com.google.android.exoplayer.chunk.FormatEvaluator;
 import com.google.android.exoplayer.chunk.FormatEvaluator.Evaluation;
 import com.google.android.exoplayer.chunk.MediaChunk;
 import com.google.android.exoplayer.chunk.Mp4MediaChunk;
+import com.google.android.exoplayer.parser.Extractor;
 import com.google.android.exoplayer.parser.mp4.FragmentedMp4Extractor;
 import com.google.android.exoplayer.parser.mp4.Track;
 import com.google.android.exoplayer.parser.mp4.TrackEncryptionBox;
@@ -227,7 +228,7 @@ public class SmoothStreamingChunkSource implements ChunkSource {
  }
  private static MediaChunk newMediaChunk(Format formatInfo, Uri uri, String cacheKey,
-      FragmentedMp4Extractor extractor, DataSource dataSource, int chunkIndex,
+      Extractor extractor, DataSource dataSource, int chunkIndex,
      boolean isLast, long chunkStartTimeUs, long nextChunkStartTimeUs, int trigger) {
    int nextChunkIndex = isLast ? -1 : chunkIndex + 1;
    long nextStartTimeUs = isLast ? -1 : nextChunkStartTimeUs;