Support AAC without platform MediaExtractor.

Issue: #231
Issue: #227

demo/src/main/java/com/google/android/exoplayer/demo/DemoUtil.java

@@ -43,10 +43,11 @@ public class DemoUtil {
 
   public static final int TYPE_DASH = 0;
   public static final int TYPE_SS = 1;
-  public static final int TYPE_OTHER = 2;
-  public static final int TYPE_HLS = 3;
-  public static final int TYPE_MP4 = 4;
-  public static final int TYPE_MP3 = 5;
+  public static final int TYPE_HLS = 2;
+  public static final int TYPE_MP4 = 3;
+  public static final int TYPE_MP3 = 4;
+  public static final int TYPE_AAC = 5;
+  public static final int TYPE_OTHER = 6;
 
   private static final CookieManager defaultCookieManager;
 

demo/src/main/java/com/google/android/exoplayer/demo/PlayerActivity.java

@@ -29,6 +29,7 @@ import com.google.android.exoplayer.demo.player.SmoothStreamingRendererBuilder;
 import com.google.android.exoplayer.demo.player.UnsupportedDrmException;
 import com.google.android.exoplayer.extractor.mp3.Mp3Extractor;
 import com.google.android.exoplayer.extractor.mp4.Mp4Extractor;
+import com.google.android.exoplayer.extractor.ts.AdtsExtractor;
 import com.google.android.exoplayer.metadata.GeobMetadata;
 import com.google.android.exoplayer.metadata.PrivMetadata;
 import com.google.android.exoplayer.metadata.TxxxMetadata;
@@ -234,6 +235,9 @@ public class PlayerActivity extends Activity implements SurfaceHolder.Callback,
       case DemoUtil.TYPE_MP3:
         return new ExtractorRendererBuilder(userAgent, contentUri, debugTextView,
             new Mp3Extractor());
+      case DemoUtil.TYPE_AAC:
+        return new ExtractorRendererBuilder(userAgent, contentUri, debugTextView,
+            new AdtsExtractor());
       default:
         return new DefaultRendererBuilder(this, contentUri, debugTextView);
     }

demo/src/main/java/com/google/android/exoplayer/demo/Samples.java

@@ -134,7 +134,7 @@ import java.util.Locale;
         DemoUtil.TYPE_OTHER),
     new Sample("Apple AAC 10s", "https://devimages.apple.com.edgekey.net/"
         + "streaming/examples/bipbop_4x3/gear0/fileSequence0.aac",
-        DemoUtil.TYPE_OTHER),
+        DemoUtil.TYPE_AAC),
     new Sample("Big Buck Bunny (MP4 Video)",
         "http://redirector.c.youtube.com/videoplayback?id=604ed5ce52eda7ee&itag=22&source=youtube"
         + "&sparams=ip,ipbits,expire&ip=0.0.0.0&ipbits=0&expire=19000000000&signature="

library/src/main/java/com/google/android/exoplayer/extractor/ChunkIndex.java

@@ -71,6 +71,13 @@ public final class ChunkIndex implements SeekMap {
     return Util.binarySearchFloor(timesUs, timeUs, true, true);
   }
 
+  // SeekMap implementation.
+
+  @Override
+  public boolean isSeekable() {
+    return true;
+  }
+
   @Override
   public long getPosition(long timeUs) {
     return offsets[getChunkIndex(timeUs)];

library/src/main/java/com/google/android/exoplayer/extractor/SeekMap.java

@@ -21,12 +21,22 @@ package com.google.android.exoplayer.extractor;
 public interface SeekMap {
 
   /**
+   * Whether or not the seeking is supported.
+   * <p>
+   * If seeking is not supported then the only valid seek position is the start of the file, and so
+   * {@link #getPosition(long)} will return 0 for all input values.
+   *
+   * @return True if seeking is supported. False otherwise.
+   */
+  boolean isSeekable();
+
+  /**
    * Maps a seek position in microseconds to a corresponding position (byte offset) in the stream
    * from which data can be provided to the extractor.
    *
    * @param timeUs A seek position in microseconds.
    * @return The corresponding position (byte offset) in the stream from which data can be provided
-   *     to the extractor.
+   *     to the extractor, or 0 if {@code #isSeekable()} returns false.
    */
   long getPosition(long timeUs);
 

library/src/main/java/com/google/android/exoplayer/extractor/mp3/ConstantBitrateSeeker.java

@@ -20,7 +20,7 @@ import com.google.android.exoplayer.C;
 /**
  * MP3 seeker that doesn't rely on metadata and seeks assuming the source has a constant bitrate.
  */
-/* package */ final class ConstantBitrateSeeker implements Mp3Extractor.Seeker {
+/* package */ final class ConstantBitrateSeeker extends Mp3Extractor.Seeker {
 
   private static final int MICROSECONDS_PER_SECOND = 1000000;
   private static final int BITS_PER_BYTE = 8;

library/src/main/java/com/google/android/exoplayer/extractor/mp3/Mp3Extractor.java

@@ -37,25 +37,6 @@ import java.util.Collections;
  */
 public final class Mp3Extractor implements Extractor {
 
-  /**
-   * {@link SeekMap} that also allows mapping from position (byte offset) back to time, which can be
-   * used to work out the new sample basis timestamp after seeking and resynchronization.
-   */
-  /* package */ interface Seeker extends SeekMap {
-
-    /**
-     * Maps a position (byte offset) to a corresponding sample timestamp.
-     *
-     * @param position A seek position (byte offset) relative to the start of the stream.
-     * @return The corresponding timestamp of the next sample to be read, in microseconds.
-     */
-    long getTimeUs(long position);
-
-    /** Returns the duration of the source, in microseconds. */
-    long getDurationUs();
-
-  }
-
   /** The maximum number of bytes to search when synchronizing, before giving up. */
   private static final int MAX_BYTES_TO_SEARCH = 128 * 1024;
 
@@ -288,4 +269,28 @@ public final class Mp3Extractor implements Extractor {
     return extractorInput.getPosition() - bufferingInput.getAvailableByteCount();
   }
 
+  /**
+   * {@link SeekMap} that also allows mapping from position (byte offset) back to time, which can be
+   * used to work out the new sample basis timestamp after seeking and resynchronization.
+   */
+  /* package */ abstract static class Seeker implements SeekMap {
+
+    @Override
+    public final boolean isSeekable() {
+      return true;
+    }
+
+    /**
+     * Maps a position (byte offset) to a corresponding sample timestamp.
+     *
+     * @param position A seek position (byte offset) relative to the start of the stream.
+     * @return The corresponding timestamp of the next sample to be read, in microseconds.
+     */
+    abstract long getTimeUs(long position);
+
+    /** Returns the duration of the source, in microseconds. */
+    abstract long getDurationUs();
+
+  }
+
 }

library/src/main/java/com/google/android/exoplayer/extractor/mp3/VbriSeeker.java

@@ -21,7 +21,7 @@ import com.google.android.exoplayer.util.Util;
 /**
  * MP3 seeker that uses metadata from a VBRI header.
  */
-/* package */ final class VbriSeeker implements Mp3Extractor.Seeker {
+/* package */ final class VbriSeeker extends Mp3Extractor.Seeker {
 
   private static final int VBRI_HEADER = Util.getIntegerCodeForString("VBRI");
 

library/src/main/java/com/google/android/exoplayer/extractor/mp3/XingSeeker.java

@@ -22,7 +22,7 @@ import com.google.android.exoplayer.util.Util;
 /**
  * MP3 seeker that uses metadata from a XING header.
  */
-/* package */ final class XingSeeker implements Mp3Extractor.Seeker {
+/* package */ final class XingSeeker extends Mp3Extractor.Seeker {
 
   private static final int XING_HEADER = Util.getIntegerCodeForString("Xing");
   private static final int INFO_HEADER = Util.getIntegerCodeForString("Info");

library/src/main/java/com/google/android/exoplayer/extractor/mp4/Mp4Extractor.java

@@ -114,6 +114,11 @@ public final class Mp4Extractor implements Extractor, SeekMap {
   // SeekMap implementation.
 
   @Override
+  public boolean isSeekable() {
+    return true;
+  }
+
+  @Override
   public long getPosition(long timeUs) {
     long earliestSamplePosition = Long.MAX_VALUE;
     for (int trackIndex = 0; trackIndex < tracks.length; trackIndex++) {
@@ -132,6 +137,8 @@ public final class Mp4Extractor implements Extractor, SeekMap {
     return earliestSamplePosition;
   }
 
+  // Private methods.
+
   private boolean readAtomHeader(ExtractorInput input) throws IOException, InterruptedException {
     if (!input.readFully(atomHeader.data, 0, Atom.HEADER_SIZE, true)) {
       return false;

library/src/main/java/com/google/android/exoplayer/extractor/ts/AdtsExtractor.java

@@ -19,6 +19,7 @@ import com.google.android.exoplayer.extractor.Extractor;
 import com.google.android.exoplayer.extractor.ExtractorInput;
 import com.google.android.exoplayer.extractor.ExtractorOutput;
 import com.google.android.exoplayer.extractor.PositionHolder;
+import com.google.android.exoplayer.extractor.SeekMap;
 import com.google.android.exoplayer.util.ParsableByteArray;
 
 import java.io.IOException;
@@ -27,19 +28,23 @@ import java.io.IOException;
  * Facilitates the extraction of AAC samples from elementary audio files formatted as AAC with ADTS
  * headers.
  */
-public class AdtsExtractor implements Extractor {
+public class AdtsExtractor implements Extractor, SeekMap {
 
   private static final int MAX_PACKET_SIZE = 200;
 
-  private final long firstSampleTimestamp;
+  private final long firstSampleTimestampUs;
   private final ParsableByteArray packetBuffer;
 
   // Accessed only by the loading thread.
   private AdtsReader adtsReader;
   private boolean firstPacket;
 
-  public AdtsExtractor(long firstSampleTimestamp) {
-    this.firstSampleTimestamp = firstSampleTimestamp;
+  public AdtsExtractor() {
+    this(0);
+  }
+
+  public AdtsExtractor(long firstSampleTimestampUs) {
+    this.firstSampleTimestampUs = firstSampleTimestampUs;
     packetBuffer = new ParsableByteArray(MAX_PACKET_SIZE);
     firstPacket = true;
   }
@@ -48,11 +53,13 @@ public class AdtsExtractor implements Extractor {
   public void init(ExtractorOutput output) {
     adtsReader = new AdtsReader(output.track(0));
     output.endTracks();
+    output.seekMap(this);
   }
 
   @Override
   public void seek() {
-    throw new UnsupportedOperationException();
+    adtsReader.seek();
+    firstPacket = true;
   }
 
   @Override
@@ -69,9 +76,21 @@ public class AdtsExtractor implements Extractor {
 
     // TODO: Make it possible for adtsReader to consume the dataSource directly, so that it becomes
     // unnecessary to copy the data through packetBuffer.
-    adtsReader.consume(packetBuffer, firstSampleTimestamp, firstPacket);
+    adtsReader.consume(packetBuffer, firstSampleTimestampUs, firstPacket);
     firstPacket = false;
     return RESULT_CONTINUE;
   }
 
+  // SeekMap implementation.
+
+  @Override
+  public boolean isSeekable() {
+    return false;
+  }
+
+  @Override
+  public long getPosition(long timeUs) {
+    return 0;
+  }
+
 }

library/src/main/java/com/google/android/exoplayer/extractor/ts/AdtsReader.java

@@ -62,6 +62,18 @@ import java.util.Collections;
     state = STATE_FINDING_SYNC;
   }
 
+  /**
+   * Notifies the reader that a seek has occurred.
+   * <p>
+   * The data passed to the next invocation of {@link #consume(ParsableByteArray, long, boolean)}
+   * should not be treated as a continuation of the data passed to previous calls.
+   */
+  public void seek() {
+    state = STATE_FINDING_SYNC;
+    bytesRead = 0;
+    lastByteWasFF = false;
+  }
+
   @Override
   public void consume(ParsableByteArray data, long pesTimeUs, boolean startOfPacket) {
     if (startOfPacket) {