diff --git a/RELEASENOTES.md b/RELEASENOTES.md
index 435658a954..47180ebfc8 100644
--- a/RELEASENOTES.md
+++ b/RELEASENOTES.md
@@ -35,6 +35,8 @@
 * IMA: Allow setting the ad media load timeout
   ([#3691](https://github.com/google/ExoPlayer/issues/3691)).
 * Audio:
+  * Support extracting data from AMR container formats, including both narrow
+    and wide band ([#2527](https://github.com/google/ExoPlayer/issues/2527)).
   * FLAC:
     * Sniff FLAC files correctly if they have ID3 headers
       ([#4055](https://github.com/google/ExoPlayer/issues/4055)).
diff --git a/extensions/flac/build.gradle b/extensions/flac/build.gradle
index 9bf8d39435..609953130b 100644
--- a/extensions/flac/build.gradle
+++ b/extensions/flac/build.gradle
@@ -34,6 +34,7 @@ dependencies {
     implementation 'com.android.support:support-annotations:' + supportLibraryVersion
     implementation project(modulePrefix + 'library-core')
     androidTestImplementation project(modulePrefix + 'testutils')
+    testImplementation project(modulePrefix + 'testutils-robolectric')
 }
 
 ext {
diff --git a/library/core/src/main/java/com/google/android/exoplayer2/extractor/DefaultExtractorsFactory.java b/library/core/src/main/java/com/google/android/exoplayer2/extractor/DefaultExtractorsFactory.java
index b85ecba3a4..425f2b77cd 100644
--- a/library/core/src/main/java/com/google/android/exoplayer2/extractor/DefaultExtractorsFactory.java
+++ b/library/core/src/main/java/com/google/android/exoplayer2/extractor/DefaultExtractorsFactory.java
@@ -15,6 +15,7 @@
  */
 package com.google.android.exoplayer2.extractor;
 
+import com.google.android.exoplayer2.extractor.amr.AmrExtractor;
 import com.google.android.exoplayer2.extractor.flv.FlvExtractor;
 import com.google.android.exoplayer2.extractor.mkv.MatroskaExtractor;
 import com.google.android.exoplayer2.extractor.mp3.Mp3Extractor;
@@ -35,18 +36,19 @@ import java.lang.reflect.Constructor;
  * An {@link ExtractorsFactory} that provides an array of extractors for the following formats:
  *
  * <ul>
- * <li>MP4, including M4A ({@link Mp4Extractor})</li>
- * <li>fMP4 ({@link FragmentedMp4Extractor})</li>
- * <li>Matroska and WebM ({@link MatroskaExtractor})</li>
- * <li>Ogg Vorbis/FLAC ({@link OggExtractor}</li>
- * <li>MP3 ({@link Mp3Extractor})</li>
- * <li>AAC ({@link AdtsExtractor})</li>
- * <li>MPEG TS ({@link TsExtractor})</li>
- * <li>MPEG PS ({@link PsExtractor})</li>
- * <li>FLV ({@link FlvExtractor})</li>
- * <li>WAV ({@link WavExtractor})</li>
- * <li>AC3 ({@link Ac3Extractor})</li>
- * <li>FLAC (only available if the FLAC extension is built and included)</li>
+ *   <li>MP4, including M4A ({@link Mp4Extractor})
+ *   <li>fMP4 ({@link FragmentedMp4Extractor})
+ *   <li>Matroska and WebM ({@link MatroskaExtractor})
+ *   <li>Ogg Vorbis/FLAC ({@link OggExtractor}
+ *   <li>MP3 ({@link Mp3Extractor})
+ *   <li>AAC ({@link AdtsExtractor})
+ *   <li>MPEG TS ({@link TsExtractor})
+ *   <li>MPEG PS ({@link PsExtractor})
+ *   <li>FLV ({@link FlvExtractor})
+ *   <li>WAV ({@link WavExtractor})
+ *   <li>AC3 ({@link Ac3Extractor})
+ *   <li>AMR ({@link AmrExtractor})
+ *   <li>FLAC (only available if the FLAC extension is built and included)
  * </ul>
  */
 public final class DefaultExtractorsFactory implements ExtractorsFactory {
@@ -159,7 +161,7 @@ public final class DefaultExtractorsFactory implements ExtractorsFactory {
 
   @Override
   public synchronized Extractor[] createExtractors() {
-    Extractor[] extractors = new Extractor[FLAC_EXTRACTOR_CONSTRUCTOR == null ? 11 : 12];
+    Extractor[] extractors = new Extractor[FLAC_EXTRACTOR_CONSTRUCTOR == null ? 12 : 13];
     extractors[0] = new MatroskaExtractor(matroskaFlags);
     extractors[1] = new FragmentedMp4Extractor(fragmentedMp4Flags);
     extractors[2] = new Mp4Extractor(mp4Flags);
@@ -171,9 +173,10 @@ public final class DefaultExtractorsFactory implements ExtractorsFactory {
     extractors[8] = new OggExtractor();
     extractors[9] = new PsExtractor();
     extractors[10] = new WavExtractor();
+    extractors[11] = new AmrExtractor();
     if (FLAC_EXTRACTOR_CONSTRUCTOR != null) {
       try {
-        extractors[11] = FLAC_EXTRACTOR_CONSTRUCTOR.newInstance();
+        extractors[12] = FLAC_EXTRACTOR_CONSTRUCTOR.newInstance();
       } catch (Exception e) {
         // Should never happen.
         throw new IllegalStateException("Unexpected error creating FLAC extractor", e);
diff --git a/library/core/src/main/java/com/google/android/exoplayer2/extractor/amr/AmrExtractor.java b/library/core/src/main/java/com/google/android/exoplayer2/extractor/amr/AmrExtractor.java
new file mode 100644
index 0000000000..b58e979c26
--- /dev/null
+++ b/library/core/src/main/java/com/google/android/exoplayer2/extractor/amr/AmrExtractor.java
@@ -0,0 +1,299 @@
+/*
+ * Copyright (C) 2018 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.exoplayer2.extractor.amr;
+
+import com.google.android.exoplayer2.C;
+import com.google.android.exoplayer2.Format;
+import com.google.android.exoplayer2.ParserException;
+import com.google.android.exoplayer2.extractor.Extractor;
+import com.google.android.exoplayer2.extractor.ExtractorInput;
+import com.google.android.exoplayer2.extractor.ExtractorOutput;
+import com.google.android.exoplayer2.extractor.ExtractorsFactory;
+import com.google.android.exoplayer2.extractor.PositionHolder;
+import com.google.android.exoplayer2.extractor.SeekMap;
+import com.google.android.exoplayer2.extractor.TrackOutput;
+import com.google.android.exoplayer2.util.MimeTypes;
+import com.google.android.exoplayer2.util.Util;
+import java.io.EOFException;
+import java.io.IOException;
+import java.util.Arrays;
+
+/**
+ * Extracts data from the AMR containers format (either AMR or AMR-WB). This follows RFC-4867,
+ * section 5.
+ *
+ * <p>This extractor only supports single-channel AMR container formats.
+ */
+public final class AmrExtractor implements Extractor {
+
+  /** Factory for {@link AmrExtractor} instances. */
+  public static final ExtractorsFactory FACTORY =
+      new ExtractorsFactory() {
+
+        @Override
+        public Extractor[] createExtractors() {
+          return new Extractor[] {new AmrExtractor()};
+        }
+      };
+
+  /**
+   * The frame size in bytes, including header (1 byte), for each of the 16 frame types for AMR
+   * narrow band.
+   */
+  private static final int[] frameSizeBytesByTypeNb = {
+    13,
+    14,
+    16,
+    18,
+    20,
+    21,
+    27,
+    32,
+    6, // AMR SID
+    7, // GSM-EFR SID
+    6, // TDMA-EFR SID
+    6, // PDC-EFR SID
+    1, // Future use
+    1, // Future use
+    1, // Future use
+    1 // No data
+  };
+
+  /**
+   * The frame size in bytes, including header (1 byte), for each of the 16 frame types for AMR wide
+   * band.
+   */
+  private static final int[] frameSizeBytesByTypeWb = {
+    18,
+    24,
+    33,
+    37,
+    41,
+    47,
+    51,
+    59,
+    61,
+    6, // AMR-WB SID
+    1, // Future use
+    1, // Future use
+    1, // Future use
+    1, // Future use
+    1, // speech lost
+    1 // No data
+  };
+
+  private static final byte[] amrSignatureNb = Util.getUtf8Bytes("#!AMR\n");
+  private static final byte[] amrSignatureWb = Util.getUtf8Bytes("#!AMR-WB\n");
+
+  /** Theoretical maximum frame size for a AMR frame. */
+  private static final int MAX_FRAME_SIZE_BYTES = frameSizeBytesByTypeWb[8];
+
+  private static final int SAMPLE_RATE_WB = 16_000;
+  private static final int SAMPLE_RATE_NB = 8_000;
+  private static final int SAMPLE_TIME_PER_FRAME_US = 20_000;
+
+  private final byte[] scratch;
+
+  private boolean isWideBand;
+  private long currentSampleTimeUs;
+  private int currentSampleTotalBytes;
+  private int currentSampleBytesRemaining;
+
+  private TrackOutput trackOutput;
+  private boolean hasOutputFormat;
+
+  public AmrExtractor() {
+    scratch = new byte[1];
+  }
+
+  // Extractor implementation.
+
+  @Override
+  public boolean sniff(ExtractorInput input) throws IOException, InterruptedException {
+    return readAmrHeader(input);
+  }
+
+  @Override
+  public void init(ExtractorOutput output) {
+    output.seekMap(new SeekMap.Unseekable(C.TIME_UNSET));
+    trackOutput = output.track(/* id= */ 0, C.TRACK_TYPE_AUDIO);
+    output.endTracks();
+  }
+
+  @Override
+  public int read(ExtractorInput input, PositionHolder seekPosition)
+      throws IOException, InterruptedException {
+    if (input.getPosition() == 0) {
+      if (!readAmrHeader(input)) {
+        throw new ParserException("Could not find AMR header.");
+      }
+    }
+    maybeOutputFormat();
+    return readSample(input);
+  }
+
+  @Override
+  public void seek(long position, long timeUs) {
+    currentSampleTimeUs = 0;
+    currentSampleTotalBytes = 0;
+    currentSampleBytesRemaining = 0;
+  }
+
+  @Override
+  public void release() {
+    // Do nothing
+  }
+
+  /* package */ static int frameSizeBytesByTypeNb(int frameType) {
+    return frameSizeBytesByTypeNb[frameType];
+  }
+
+  /* package */ static int frameSizeBytesByTypeWb(int frameType) {
+    return frameSizeBytesByTypeWb[frameType];
+  }
+
+  /* package */ static byte[] amrSignatureNb() {
+    return Arrays.copyOf(amrSignatureNb, amrSignatureNb.length);
+  }
+
+  /* package */ static byte[] amrSignatureWb() {
+    return Arrays.copyOf(amrSignatureWb, amrSignatureWb.length);
+  }
+
+  // Internal methods.
+
+  /**
+   * Peeks the AMR header from the beginning of the input, and consumes it if it exists.
+   *
+   * @param input The {@link ExtractorInput} from which data should be peeked/read.
+   * @return Whether the AMR header has been read.
+   */
+  private boolean readAmrHeader(ExtractorInput input) throws IOException, InterruptedException {
+    if (peekAmrSignature(input, amrSignatureNb)) {
+      isWideBand = false;
+      input.skipFully(amrSignatureNb.length);
+      return true;
+    } else if (peekAmrSignature(input, amrSignatureWb)) {
+      isWideBand = true;
+      input.skipFully(amrSignatureWb.length);
+      return true;
+    }
+    return false;
+  }
+
+  /** Peeks from the beginning of the input to see if the given AMR signature exists. */
+  private boolean peekAmrSignature(ExtractorInput input, byte[] amrSignature)
+      throws IOException, InterruptedException {
+    input.resetPeekPosition();
+    byte[] header = new byte[amrSignature.length];
+    input.peekFully(header, 0, amrSignature.length);
+    return Arrays.equals(header, amrSignature);
+  }
+
+  private void maybeOutputFormat() {
+    if (!hasOutputFormat) {
+      hasOutputFormat = true;
+      String mimeType = isWideBand ? MimeTypes.AUDIO_AMR_WB : MimeTypes.AUDIO_AMR_NB;
+      int sampleRate = isWideBand ? SAMPLE_RATE_WB : SAMPLE_RATE_NB;
+      trackOutput.format(
+          Format.createAudioSampleFormat(
+              /* id= */ null,
+              mimeType,
+              /* codecs= */ null,
+              /* bitrate= */ Format.NO_VALUE,
+              MAX_FRAME_SIZE_BYTES,
+              /* channelCount= */ 1,
+              sampleRate,
+              /* pcmEncoding= */ Format.NO_VALUE,
+              /* initializationData= */ null,
+              /* drmInitData= */ null,
+              /* selectionFlags= */ 0,
+              /* language= */ null));
+    }
+  }
+
+  private int readSample(ExtractorInput extractorInput) throws IOException, InterruptedException {
+    if (currentSampleBytesRemaining == 0) {
+      try {
+        currentSampleTotalBytes = readNextSampleSize(extractorInput);
+      } catch (EOFException e) {
+        return RESULT_END_OF_INPUT;
+      }
+      currentSampleBytesRemaining = currentSampleTotalBytes;
+    }
+
+    int bytesAppended =
+        trackOutput.sampleData(
+            extractorInput, currentSampleBytesRemaining, /* allowEndOfInput= */ true);
+    if (bytesAppended == C.RESULT_END_OF_INPUT) {
+      return RESULT_END_OF_INPUT;
+    }
+    currentSampleBytesRemaining -= bytesAppended;
+    if (currentSampleBytesRemaining > 0) {
+      return RESULT_CONTINUE;
+    }
+
+    trackOutput.sampleMetadata(
+        currentSampleTimeUs,
+        C.BUFFER_FLAG_KEY_FRAME,
+        currentSampleTotalBytes,
+        /* offset= */ 0,
+        /* encryptionData= */ null);
+    currentSampleTimeUs += SAMPLE_TIME_PER_FRAME_US;
+    return RESULT_CONTINUE;
+  }
+
+  private int readNextSampleSize(ExtractorInput extractorInput)
+      throws IOException, InterruptedException {
+    extractorInput.resetPeekPosition();
+    extractorInput.peekFully(scratch, /* offset= */ 0, /* length= */ 1);
+
+    byte frameHeader = scratch[0];
+    if ((frameHeader & 0x83) > 0) {
+      // The padding bits are at bit-1 positions in the following pattern: 1000 0011
+      // Padding bits must be 0.
+      throw new ParserException("Invalid padding bits for frame header " + frameHeader);
+    }
+
+    int frameType = (frameHeader >> 3) & 0x0f;
+    return getFrameSizeInBytes(frameType);
+  }
+
+  private int getFrameSizeInBytes(int frameType) throws ParserException {
+    if (!isValidFrameType(frameType)) {
+      throw new ParserException(
+          "Illegal AMR " + (isWideBand ? "WB" : "NB") + " frame type " + frameType);
+    }
+
+    return isWideBand ? frameSizeBytesByTypeWb[frameType] : frameSizeBytesByTypeNb[frameType];
+  }
+
+  private boolean isValidFrameType(int frameType) {
+    return frameType >= 0
+        && frameType <= 15
+        && (isWideBandValidFrameType(frameType) || isNarrowBandValidFrameType(frameType));
+  }
+
+  private boolean isWideBandValidFrameType(int frameType) {
+    // For wide band, type 10-13 are for future use.
+    return isWideBand && (frameType < 10 || frameType > 13);
+  }
+
+  private boolean isNarrowBandValidFrameType(int frameType) {
+    // For narrow band, type 12-14 are for future use.
+    return !isWideBand && (frameType < 12 || frameType > 14);
+  }
+}
diff --git a/library/core/src/test/assets/amr/sample_nb.amr b/library/core/src/test/assets/amr/sample_nb.amr
new file mode 100644
index 0000000000..2e21cc843c
Binary files /dev/null and b/library/core/src/test/assets/amr/sample_nb.amr differ
diff --git a/library/core/src/test/assets/amr/sample_nb.amr.0.dump b/library/core/src/test/assets/amr/sample_nb.amr.0.dump
new file mode 100644
index 0000000000..e0dec9c62c
--- /dev/null
+++ b/library/core/src/test/assets/amr/sample_nb.amr.0.dump
@@ -0,0 +1,902 @@
+seekMap:
+  isSeekable = false
+  duration = UNSET TIME
+  getPosition(0) = [[timeUs=0, position=0]]
+numberOfTracks = 1
+track 0:
+  format:
+    bitrate = -1
+    id = null
+    containerMimeType = null
+    sampleMimeType = audio/3gpp
+    maxInputSize = 61
+    width = -1
+    height = -1
+    frameRate = -1.0
+    rotationDegrees = 0
+    pixelWidthHeightRatio = 1.0
+    channelCount = 1
+    sampleRate = 8000
+    pcmEncoding = -1
+    encoderDelay = 0
+    encoderPadding = 0
+    subsampleOffsetUs = 9223372036854775807
+    selectionFlags = 0
+    language = null
+    drmInitData = -
+    initializationData:
+  total output bytes = 2834
+  sample count = 218
+  sample 0:
+    time = 0
+    flags = 1
+    data = length 13, hash 371B046C
+  sample 1:
+    time = 20000
+    flags = 1
+    data = length 13, hash CE30BF5B
+  sample 2:
+    time = 40000
+    flags = 1
+    data = length 13, hash 19A59975
+  sample 3:
+    time = 60000
+    flags = 1
+    data = length 13, hash 4879773C
+  sample 4:
+    time = 80000
+    flags = 1
+    data = length 13, hash E8F83019
+  sample 5:
+    time = 100000
+    flags = 1
+    data = length 13, hash D265CDC9
+  sample 6:
+    time = 120000
+    flags = 1
+    data = length 13, hash 91653DAA
+  sample 7:
+    time = 140000
+    flags = 1
+    data = length 13, hash C79456F6
+  sample 8:
+    time = 160000
+    flags = 1
+    data = length 13, hash CDDC4422
+  sample 9:
+    time = 180000
+    flags = 1
+    data = length 13, hash D9ED3AF1
+  sample 10:
+    time = 200000
+    flags = 1
+    data = length 13, hash BAB75A33
+  sample 11:
+    time = 220000
+    flags = 1
+    data = length 13, hash 2221B4FF
+  sample 12:
+    time = 240000
+    flags = 1
+    data = length 13, hash 96400A0B
+  sample 13:
+    time = 260000
+    flags = 1
+    data = length 13, hash 582E6FB
+  sample 14:
+    time = 280000
+    flags = 1
+    data = length 13, hash C4E878E5
+  sample 15:
+    time = 300000
+    flags = 1
+    data = length 13, hash C849A1BD
+  sample 16:
+    time = 320000
+    flags = 1
+    data = length 13, hash CFA8A9ED
+  sample 17:
+    time = 340000
+    flags = 1
+    data = length 13, hash 70CA4907
+  sample 18:
+    time = 360000
+    flags = 1
+    data = length 13, hash B47D4454
+  sample 19:
+    time = 380000
+    flags = 1
+    data = length 13, hash 282998C1
+  sample 20:
+    time = 400000
+    flags = 1
+    data = length 13, hash 3F3F7A65
+  sample 21:
+    time = 420000
+    flags = 1
+    data = length 13, hash CC2EAB58
+  sample 22:
+    time = 440000
+    flags = 1
+    data = length 13, hash 279EF712
+  sample 23:
+    time = 460000
+    flags = 1
+    data = length 13, hash AA2F4B29
+  sample 24:
+    time = 480000
+    flags = 1
+    data = length 13, hash F6F658C4
+  sample 25:
+    time = 500000
+    flags = 1
+    data = length 13, hash D7DEBD17
+  sample 26:
+    time = 520000
+    flags = 1
+    data = length 13, hash 6DAB9A17
+  sample 27:
+    time = 540000
+    flags = 1
+    data = length 13, hash 6ECE1571
+  sample 28:
+    time = 560000
+    flags = 1
+    data = length 13, hash B3D0507F
+  sample 29:
+    time = 580000
+    flags = 1
+    data = length 13, hash 21E356B9
+  sample 30:
+    time = 600000
+    flags = 1
+    data = length 13, hash 410EA12
+  sample 31:
+    time = 620000
+    flags = 1
+    data = length 13, hash 533895A8
+  sample 32:
+    time = 640000
+    flags = 1
+    data = length 13, hash C61B3E5A
+  sample 33:
+    time = 660000
+    flags = 1
+    data = length 13, hash 982170E6
+  sample 34:
+    time = 680000
+    flags = 1
+    data = length 13, hash 7A0468C5
+  sample 35:
+    time = 700000
+    flags = 1
+    data = length 13, hash 9C85EAA7
+  sample 36:
+    time = 720000
+    flags = 1
+    data = length 13, hash B6B341B6
+  sample 37:
+    time = 740000
+    flags = 1
+    data = length 13, hash 6937532E
+  sample 38:
+    time = 760000
+    flags = 1
+    data = length 13, hash 8CF2A3A0
+  sample 39:
+    time = 780000
+    flags = 1
+    data = length 13, hash D2682AC6
+  sample 40:
+    time = 800000
+    flags = 1
+    data = length 13, hash BBC5710F
+  sample 41:
+    time = 820000
+    flags = 1
+    data = length 13, hash 59080B6C
+  sample 42:
+    time = 840000
+    flags = 1
+    data = length 13, hash E4118291
+  sample 43:
+    time = 860000
+    flags = 1
+    data = length 13, hash A1E5B296
+  sample 44:
+    time = 880000
+    flags = 1
+    data = length 13, hash D7B8F95B
+  sample 45:
+    time = 900000
+    flags = 1
+    data = length 13, hash CC839BE1
+  sample 46:
+    time = 920000
+    flags = 1
+    data = length 13, hash D459DFCE
+  sample 47:
+    time = 940000
+    flags = 1
+    data = length 13, hash D6AD19EC
+  sample 48:
+    time = 960000
+    flags = 1
+    data = length 13, hash D05E373D
+  sample 49:
+    time = 980000
+    flags = 1
+    data = length 13, hash 6A4460C7
+  sample 50:
+    time = 1000000
+    flags = 1
+    data = length 13, hash C9A0D93F
+  sample 51:
+    time = 1020000
+    flags = 1
+    data = length 13, hash 3FA819E7
+  sample 52:
+    time = 1040000
+    flags = 1
+    data = length 13, hash 1D3CBDFC
+  sample 53:
+    time = 1060000
+    flags = 1
+    data = length 13, hash 8BBBB403
+  sample 54:
+    time = 1080000
+    flags = 1
+    data = length 13, hash 21B4A0F9
+  sample 55:
+    time = 1100000
+    flags = 1
+    data = length 13, hash C0F921D1
+  sample 56:
+    time = 1120000
+    flags = 1
+    data = length 13, hash 5D812AAB
+  sample 57:
+    time = 1140000
+    flags = 1
+    data = length 13, hash 50C9F3F8
+  sample 58:
+    time = 1160000
+    flags = 1
+    data = length 13, hash 5C2BB5D1
+  sample 59:
+    time = 1180000
+    flags = 1
+    data = length 13, hash 6BF9BEA5
+  sample 60:
+    time = 1200000
+    flags = 1
+    data = length 13, hash 2738C1E6
+  sample 61:
+    time = 1220000
+    flags = 1
+    data = length 13, hash 5FC288A6
+  sample 62:
+    time = 1240000
+    flags = 1
+    data = length 13, hash 7E8E442A
+  sample 63:
+    time = 1260000
+    flags = 1
+    data = length 13, hash AEAA2BBA
+  sample 64:
+    time = 1280000
+    flags = 1
+    data = length 13, hash 4E2ACD2F
+  sample 65:
+    time = 1300000
+    flags = 1
+    data = length 13, hash D6C90ACF
+  sample 66:
+    time = 1320000
+    flags = 1
+    data = length 13, hash 6FD8A944
+  sample 67:
+    time = 1340000
+    flags = 1
+    data = length 13, hash A835BBF9
+  sample 68:
+    time = 1360000
+    flags = 1
+    data = length 13, hash F7713830
+  sample 69:
+    time = 1380000
+    flags = 1
+    data = length 13, hash 3AA966E5
+  sample 70:
+    time = 1400000
+    flags = 1
+    data = length 13, hash F939E829
+  sample 71:
+    time = 1420000
+    flags = 1
+    data = length 13, hash 7676DE49
+  sample 72:
+    time = 1440000
+    flags = 1
+    data = length 13, hash 93BB890A
+  sample 73:
+    time = 1460000
+    flags = 1
+    data = length 13, hash B57DBEC8
+  sample 74:
+    time = 1480000
+    flags = 1
+    data = length 13, hash 66B0A5B6
+  sample 75:
+    time = 1500000
+    flags = 1
+    data = length 13, hash D733E0D
+  sample 76:
+    time = 1520000
+    flags = 1
+    data = length 13, hash 80941726
+  sample 77:
+    time = 1540000
+    flags = 1
+    data = length 13, hash 556ED633
+  sample 78:
+    time = 1560000
+    flags = 1
+    data = length 13, hash C5EDF4E1
+  sample 79:
+    time = 1580000
+    flags = 1
+    data = length 13, hash 6B287445
+  sample 80:
+    time = 1600000
+    flags = 1
+    data = length 13, hash DC97C4A7
+  sample 81:
+    time = 1620000
+    flags = 1
+    data = length 13, hash DA8CBDF4
+  sample 82:
+    time = 1640000
+    flags = 1
+    data = length 13, hash 6F60FF77
+  sample 83:
+    time = 1660000
+    flags = 1
+    data = length 13, hash 3EB22B96
+  sample 84:
+    time = 1680000
+    flags = 1
+    data = length 13, hash B3C31AF5
+  sample 85:
+    time = 1700000
+    flags = 1
+    data = length 13, hash 1854AA92
+  sample 86:
+    time = 1720000
+    flags = 1
+    data = length 13, hash 6488264B
+  sample 87:
+    time = 1740000
+    flags = 1
+    data = length 13, hash 4CC8C5C1
+  sample 88:
+    time = 1760000
+    flags = 1
+    data = length 13, hash 19CC7523
+  sample 89:
+    time = 1780000
+    flags = 1
+    data = length 13, hash 9BE7B928
+  sample 90:
+    time = 1800000
+    flags = 1
+    data = length 13, hash 47EC7CFD
+  sample 91:
+    time = 1820000
+    flags = 1
+    data = length 13, hash EC940120
+  sample 92:
+    time = 1840000
+    flags = 1
+    data = length 13, hash 73BDA6D0
+  sample 93:
+    time = 1860000
+    flags = 1
+    data = length 13, hash FACB3314
+  sample 94:
+    time = 1880000
+    flags = 1
+    data = length 13, hash EC61D13B
+  sample 95:
+    time = 1900000
+    flags = 1
+    data = length 13, hash B28C7B6C
+  sample 96:
+    time = 1920000
+    flags = 1
+    data = length 13, hash B1A4CECD
+  sample 97:
+    time = 1940000
+    flags = 1
+    data = length 13, hash 56D41BA6
+  sample 98:
+    time = 1960000
+    flags = 1
+    data = length 13, hash 90499F4
+  sample 99:
+    time = 1980000
+    flags = 1
+    data = length 13, hash 65D9A9D3
+  sample 100:
+    time = 2000000
+    flags = 1
+    data = length 13, hash D9004CC
+  sample 101:
+    time = 2020000
+    flags = 1
+    data = length 13, hash 4139C6ED
+  sample 102:
+    time = 2040000
+    flags = 1
+    data = length 13, hash C4F8097C
+  sample 103:
+    time = 2060000
+    flags = 1
+    data = length 13, hash 94D424FA
+  sample 104:
+    time = 2080000
+    flags = 1
+    data = length 13, hash C2C6F5FD
+  sample 105:
+    time = 2100000
+    flags = 1
+    data = length 13, hash 15719008
+  sample 106:
+    time = 2120000
+    flags = 1
+    data = length 13, hash 4F64F524
+  sample 107:
+    time = 2140000
+    flags = 1
+    data = length 13, hash F9E01C1E
+  sample 108:
+    time = 2160000
+    flags = 1
+    data = length 13, hash 74C4EE74
+  sample 109:
+    time = 2180000
+    flags = 1
+    data = length 13, hash 7EE7553D
+  sample 110:
+    time = 2200000
+    flags = 1
+    data = length 13, hash 62DE6539
+  sample 111:
+    time = 2220000
+    flags = 1
+    data = length 13, hash 7F5EC222
+  sample 112:
+    time = 2240000
+    flags = 1
+    data = length 13, hash 644067F
+  sample 113:
+    time = 2260000
+    flags = 1
+    data = length 13, hash CDF6C9DC
+  sample 114:
+    time = 2280000
+    flags = 1
+    data = length 13, hash 8B5DBC80
+  sample 115:
+    time = 2300000
+    flags = 1
+    data = length 13, hash AD4BBA03
+  sample 116:
+    time = 2320000
+    flags = 1
+    data = length 13, hash 7A76340
+  sample 117:
+    time = 2340000
+    flags = 1
+    data = length 13, hash 3610F5B0
+  sample 118:
+    time = 2360000
+    flags = 1
+    data = length 13, hash 430BC60B
+  sample 119:
+    time = 2380000
+    flags = 1
+    data = length 13, hash 99CF1CA6
+  sample 120:
+    time = 2400000
+    flags = 1
+    data = length 13, hash 1331C70B
+  sample 121:
+    time = 2420000
+    flags = 1
+    data = length 13, hash BD76E69D
+  sample 122:
+    time = 2440000
+    flags = 1
+    data = length 13, hash 5DA652AC
+  sample 123:
+    time = 2460000
+    flags = 1
+    data = length 13, hash 3B7BF6CE
+  sample 124:
+    time = 2480000
+    flags = 1
+    data = length 13, hash ABBFD143
+  sample 125:
+    time = 2500000
+    flags = 1
+    data = length 13, hash E9447166
+  sample 126:
+    time = 2520000
+    flags = 1
+    data = length 13, hash EC40068C
+  sample 127:
+    time = 2540000
+    flags = 1
+    data = length 13, hash A2869400
+  sample 128:
+    time = 2560000
+    flags = 1
+    data = length 13, hash C7E0746B
+  sample 129:
+    time = 2580000
+    flags = 1
+    data = length 13, hash 60601BB1
+  sample 130:
+    time = 2600000
+    flags = 1
+    data = length 13, hash 975AAE9B
+  sample 131:
+    time = 2620000
+    flags = 1
+    data = length 13, hash 8BBC0EB2
+  sample 132:
+    time = 2640000
+    flags = 1
+    data = length 13, hash 57FB39E5
+  sample 133:
+    time = 2660000
+    flags = 1
+    data = length 13, hash 4CDCEEDB
+  sample 134:
+    time = 2680000
+    flags = 1
+    data = length 13, hash EA16E256
+  sample 135:
+    time = 2700000
+    flags = 1
+    data = length 13, hash 287E7D9E
+  sample 136:
+    time = 2720000
+    flags = 1
+    data = length 13, hash 55AB8FB9
+  sample 137:
+    time = 2740000
+    flags = 1
+    data = length 13, hash 129890EF
+  sample 138:
+    time = 2760000
+    flags = 1
+    data = length 13, hash 90834F57
+  sample 139:
+    time = 2780000
+    flags = 1
+    data = length 13, hash 5B3228E0
+  sample 140:
+    time = 2800000
+    flags = 1
+    data = length 13, hash DD19E175
+  sample 141:
+    time = 2820000
+    flags = 1
+    data = length 13, hash EE7EA342
+  sample 142:
+    time = 2840000
+    flags = 1
+    data = length 13, hash DB3AF473
+  sample 143:
+    time = 2860000
+    flags = 1
+    data = length 13, hash 25AEC43F
+  sample 144:
+    time = 2880000
+    flags = 1
+    data = length 13, hash EE9BF97F
+  sample 145:
+    time = 2900000
+    flags = 1
+    data = length 13, hash FFFBE047
+  sample 146:
+    time = 2920000
+    flags = 1
+    data = length 13, hash BEACFCB0
+  sample 147:
+    time = 2940000
+    flags = 1
+    data = length 13, hash AEB5096C
+  sample 148:
+    time = 2960000
+    flags = 1
+    data = length 13, hash B0D381B
+  sample 149:
+    time = 2980000
+    flags = 1
+    data = length 13, hash 3D9D5122
+  sample 150:
+    time = 3000000
+    flags = 1
+    data = length 13, hash 6C1DDB95
+  sample 151:
+    time = 3020000
+    flags = 1
+    data = length 13, hash ADACADCF
+  sample 152:
+    time = 3040000
+    flags = 1
+    data = length 13, hash 159E321E
+  sample 153:
+    time = 3060000
+    flags = 1
+    data = length 13, hash B1466264
+  sample 154:
+    time = 3080000
+    flags = 1
+    data = length 13, hash 4DDF7223
+  sample 155:
+    time = 3100000
+    flags = 1
+    data = length 13, hash C9BDB82A
+  sample 156:
+    time = 3120000
+    flags = 1
+    data = length 13, hash A49B2D9D
+  sample 157:
+    time = 3140000
+    flags = 1
+    data = length 13, hash D645E7E5
+  sample 158:
+    time = 3160000
+    flags = 1
+    data = length 13, hash 1C4232DC
+  sample 159:
+    time = 3180000
+    flags = 1
+    data = length 13, hash 83078219
+  sample 160:
+    time = 3200000
+    flags = 1
+    data = length 13, hash D6D8B072
+  sample 161:
+    time = 3220000
+    flags = 1
+    data = length 13, hash 975DB40
+  sample 162:
+    time = 3240000
+    flags = 1
+    data = length 13, hash A15FDD05
+  sample 163:
+    time = 3260000
+    flags = 1
+    data = length 13, hash 4B839E41
+  sample 164:
+    time = 3280000
+    flags = 1
+    data = length 13, hash 7418F499
+  sample 165:
+    time = 3300000
+    flags = 1
+    data = length 13, hash 7A4945E4
+  sample 166:
+    time = 3320000
+    flags = 1
+    data = length 13, hash 6249558C
+  sample 167:
+    time = 3340000
+    flags = 1
+    data = length 13, hash BD4C5BE3
+  sample 168:
+    time = 3360000
+    flags = 1
+    data = length 13, hash BAB30F1D
+  sample 169:
+    time = 3380000
+    flags = 1
+    data = length 13, hash 1E1C7012
+  sample 170:
+    time = 3400000
+    flags = 1
+    data = length 13, hash 9A3F8A89
+  sample 171:
+    time = 3420000
+    flags = 1
+    data = length 13, hash 20BE6D7B
+  sample 172:
+    time = 3440000
+    flags = 1
+    data = length 13, hash CAA0591D
+  sample 173:
+    time = 3460000
+    flags = 1
+    data = length 13, hash 6D554D17
+  sample 174:
+    time = 3480000
+    flags = 1
+    data = length 13, hash D97C3B31
+  sample 175:
+    time = 3500000
+    flags = 1
+    data = length 13, hash 75BC5C3
+  sample 176:
+    time = 3520000
+    flags = 1
+    data = length 13, hash 7BA1784B
+  sample 177:
+    time = 3540000
+    flags = 1
+    data = length 13, hash 1D175D92
+  sample 178:
+    time = 3560000
+    flags = 1
+    data = length 13, hash ADCA60FD
+  sample 179:
+    time = 3580000
+    flags = 1
+    data = length 13, hash 37018693
+  sample 180:
+    time = 3600000
+    flags = 1
+    data = length 13, hash 4553606F
+  sample 181:
+    time = 3620000
+    flags = 1
+    data = length 13, hash CF434565
+  sample 182:
+    time = 3640000
+    flags = 1
+    data = length 13, hash D264D757
+  sample 183:
+    time = 3660000
+    flags = 1
+    data = length 13, hash 4FB493EF
+  sample 184:
+    time = 3680000
+    flags = 1
+    data = length 13, hash 919F53A
+  sample 185:
+    time = 3700000
+    flags = 1
+    data = length 13, hash C22B009B
+  sample 186:
+    time = 3720000
+    flags = 1
+    data = length 13, hash 5981470
+  sample 187:
+    time = 3740000
+    flags = 1
+    data = length 13, hash A5D3937C
+  sample 188:
+    time = 3760000
+    flags = 1
+    data = length 13, hash A2504429
+  sample 189:
+    time = 3780000
+    flags = 1
+    data = length 13, hash AD1B70BE
+  sample 190:
+    time = 3800000
+    flags = 1
+    data = length 13, hash 2E39ED5E
+  sample 191:
+    time = 3820000
+    flags = 1
+    data = length 13, hash 13A8BE8E
+  sample 192:
+    time = 3840000
+    flags = 1
+    data = length 13, hash 1ACD740B
+  sample 193:
+    time = 3860000
+    flags = 1
+    data = length 13, hash 80F38B3
+  sample 194:
+    time = 3880000
+    flags = 1
+    data = length 13, hash DA9DA79F
+  sample 195:
+    time = 3900000
+    flags = 1
+    data = length 13, hash 21B95B7E
+  sample 196:
+    time = 3920000
+    flags = 1
+    data = length 13, hash CD22497B
+  sample 197:
+    time = 3940000
+    flags = 1
+    data = length 13, hash 718BB35D
+  sample 198:
+    time = 3960000
+    flags = 1
+    data = length 13, hash 69ABA6AD
+  sample 199:
+    time = 3980000
+    flags = 1
+    data = length 13, hash BAE19549
+  sample 200:
+    time = 4000000
+    flags = 1
+    data = length 13, hash 2A792FB3
+  sample 201:
+    time = 4020000
+    flags = 1
+    data = length 13, hash 71FCD8
+  sample 202:
+    time = 4040000
+    flags = 1
+    data = length 13, hash 44D2B5B3
+  sample 203:
+    time = 4060000
+    flags = 1
+    data = length 13, hash 1E87B11B
+  sample 204:
+    time = 4080000
+    flags = 1
+    data = length 13, hash 78CD2C11
+  sample 205:
+    time = 4100000
+    flags = 1
+    data = length 13, hash 9F198DF0
+  sample 206:
+    time = 4120000
+    flags = 1
+    data = length 13, hash B291F16A
+  sample 207:
+    time = 4140000
+    flags = 1
+    data = length 13, hash CF820EE0
+  sample 208:
+    time = 4160000
+    flags = 1
+    data = length 13, hash 4E24F683
+  sample 209:
+    time = 4180000
+    flags = 1
+    data = length 13, hash 52BCD68F
+  sample 210:
+    time = 4200000
+    flags = 1
+    data = length 13, hash 42588CB0
+  sample 211:
+    time = 4220000
+    flags = 1
+    data = length 13, hash EBBFECA2
+  sample 212:
+    time = 4240000
+    flags = 1
+    data = length 13, hash C11050CF
+  sample 213:
+    time = 4260000
+    flags = 1
+    data = length 13, hash 6F738603
+  sample 214:
+    time = 4280000
+    flags = 1
+    data = length 13, hash DAD06E5
+  sample 215:
+    time = 4300000
+    flags = 1
+    data = length 13, hash 5B036C64
+  sample 216:
+    time = 4320000
+    flags = 1
+    data = length 13, hash A58DC12E
+  sample 217:
+    time = 4340000
+    flags = 1
+    data = length 13, hash AC59BA7C
+tracksEnded = true
diff --git a/library/core/src/test/assets/amr/sample_wb.amr b/library/core/src/test/assets/amr/sample_wb.amr
new file mode 100644
index 0000000000..14b85b553c
Binary files /dev/null and b/library/core/src/test/assets/amr/sample_wb.amr differ
diff --git a/library/core/src/test/assets/amr/sample_wb.amr.0.dump b/library/core/src/test/assets/amr/sample_wb.amr.0.dump
new file mode 100644
index 0000000000..1b3b8bd0dd
--- /dev/null
+++ b/library/core/src/test/assets/amr/sample_wb.amr.0.dump
@@ -0,0 +1,706 @@
+seekMap:
+  isSeekable = false
+  duration = UNSET TIME
+  getPosition(0) = [[timeUs=0, position=0]]
+numberOfTracks = 1
+track 0:
+  format:
+    bitrate = -1
+    id = null
+    containerMimeType = null
+    sampleMimeType = audio/amr-wb
+    maxInputSize = 61
+    width = -1
+    height = -1
+    frameRate = -1.0
+    rotationDegrees = 0
+    pixelWidthHeightRatio = 1.0
+    channelCount = 1
+    sampleRate = 16000
+    pcmEncoding = -1
+    encoderDelay = 0
+    encoderPadding = 0
+    subsampleOffsetUs = 9223372036854775807
+    selectionFlags = 0
+    language = null
+    drmInitData = -
+    initializationData:
+  total output bytes = 4056
+  sample count = 169
+  sample 0:
+    time = 0
+    flags = 1
+    data = length 24, hash C3025798
+  sample 1:
+    time = 20000
+    flags = 1
+    data = length 24, hash 39CABAE9
+  sample 2:
+    time = 40000
+    flags = 1
+    data = length 24, hash 2752F470
+  sample 3:
+    time = 60000
+    flags = 1
+    data = length 24, hash 394F76F6
+  sample 4:
+    time = 80000
+    flags = 1
+    data = length 24, hash FF9EEF
+  sample 5:
+    time = 100000
+    flags = 1
+    data = length 24, hash 54ECB1B4
+  sample 6:
+    time = 120000
+    flags = 1
+    data = length 24, hash 6D7A3A5F
+  sample 7:
+    time = 140000
+    flags = 1
+    data = length 24, hash 684CD144
+  sample 8:
+    time = 160000
+    flags = 1
+    data = length 24, hash 87B7D176
+  sample 9:
+    time = 180000
+    flags = 1
+    data = length 24, hash 4C02F9A5
+  sample 10:
+    time = 200000
+    flags = 1
+    data = length 24, hash B4154108
+  sample 11:
+    time = 220000
+    flags = 1
+    data = length 24, hash 4448F477
+  sample 12:
+    time = 240000
+    flags = 1
+    data = length 24, hash 755A4939
+  sample 13:
+    time = 260000
+    flags = 1
+    data = length 24, hash 8C8BC6C3
+  sample 14:
+    time = 280000
+    flags = 1
+    data = length 24, hash BC37F63F
+  sample 15:
+    time = 300000
+    flags = 1
+    data = length 24, hash 3352C43C
+  sample 16:
+    time = 320000
+    flags = 1
+    data = length 24, hash 7998E1F2
+  sample 17:
+    time = 340000
+    flags = 1
+    data = length 24, hash A8ECBEFC
+  sample 18:
+    time = 360000
+    flags = 1
+    data = length 24, hash 944AC118
+  sample 19:
+    time = 380000
+    flags = 1
+    data = length 24, hash FD2C8E1F
+  sample 20:
+    time = 400000
+    flags = 1
+    data = length 24, hash B3D867AF
+  sample 21:
+    time = 420000
+    flags = 1
+    data = length 24, hash 3DC6E592
+  sample 22:
+    time = 440000
+    flags = 1
+    data = length 24, hash 32B276CD
+  sample 23:
+    time = 460000
+    flags = 1
+    data = length 24, hash 5488AEF3
+  sample 24:
+    time = 480000
+    flags = 1
+    data = length 24, hash 7A4D516
+  sample 25:
+    time = 500000
+    flags = 1
+    data = length 24, hash 570AE83F
+  sample 26:
+    time = 520000
+    flags = 1
+    data = length 24, hash E5CB3477
+  sample 27:
+    time = 540000
+    flags = 1
+    data = length 24, hash E04C00E4
+  sample 28:
+    time = 560000
+    flags = 1
+    data = length 24, hash 21B7C97
+  sample 29:
+    time = 580000
+    flags = 1
+    data = length 24, hash 1633F470
+  sample 30:
+    time = 600000
+    flags = 1
+    data = length 24, hash 28D65CA6
+  sample 31:
+    time = 620000
+    flags = 1
+    data = length 24, hash CC6A675C
+  sample 32:
+    time = 640000
+    flags = 1
+    data = length 24, hash 4C91080A
+  sample 33:
+    time = 660000
+    flags = 1
+    data = length 24, hash F6482FB5
+  sample 34:
+    time = 680000
+    flags = 1
+    data = length 24, hash 2C76F48C
+  sample 35:
+    time = 700000
+    flags = 1
+    data = length 24, hash 6E3B0D72
+  sample 36:
+    time = 720000
+    flags = 1
+    data = length 24, hash 799AA003
+  sample 37:
+    time = 740000
+    flags = 1
+    data = length 24, hash DFC0BA81
+  sample 38:
+    time = 760000
+    flags = 1
+    data = length 24, hash CBDF3826
+  sample 39:
+    time = 780000
+    flags = 1
+    data = length 24, hash 16862B75
+  sample 40:
+    time = 800000
+    flags = 1
+    data = length 24, hash 865A828E
+  sample 41:
+    time = 820000
+    flags = 1
+    data = length 24, hash 336BBDC9
+  sample 42:
+    time = 840000
+    flags = 1
+    data = length 24, hash 6CFC6C34
+  sample 43:
+    time = 860000
+    flags = 1
+    data = length 24, hash 32C8CD46
+  sample 44:
+    time = 880000
+    flags = 1
+    data = length 24, hash 9FE11C4C
+  sample 45:
+    time = 900000
+    flags = 1
+    data = length 24, hash AA5A12B7
+  sample 46:
+    time = 920000
+    flags = 1
+    data = length 24, hash AA0F4A4D
+  sample 47:
+    time = 940000
+    flags = 1
+    data = length 24, hash 34415484
+  sample 48:
+    time = 960000
+    flags = 1
+    data = length 24, hash 5018928E
+  sample 49:
+    time = 980000
+    flags = 1
+    data = length 24, hash 4A04D162
+  sample 50:
+    time = 1000000
+    flags = 1
+    data = length 24, hash 4C70F9F0
+  sample 51:
+    time = 1020000
+    flags = 1
+    data = length 24, hash 99EF3168
+  sample 52:
+    time = 1040000
+    flags = 1
+    data = length 24, hash C600DAF
+  sample 53:
+    time = 1060000
+    flags = 1
+    data = length 24, hash FDBB192E
+  sample 54:
+    time = 1080000
+    flags = 1
+    data = length 24, hash 99096A48
+  sample 55:
+    time = 1100000
+    flags = 1
+    data = length 24, hash D793F88B
+  sample 56:
+    time = 1120000
+    flags = 1
+    data = length 24, hash EEB921BD
+  sample 57:
+    time = 1140000
+    flags = 1
+    data = length 24, hash 8B941A4C
+  sample 58:
+    time = 1160000
+    flags = 1
+    data = length 24, hash ED5F5FEE
+  sample 59:
+    time = 1180000
+    flags = 1
+    data = length 24, hash A588E0BB
+  sample 60:
+    time = 1200000
+    flags = 1
+    data = length 24, hash 588CBC01
+  sample 61:
+    time = 1220000
+    flags = 1
+    data = length 24, hash DE22266C
+  sample 62:
+    time = 1240000
+    flags = 1
+    data = length 24, hash 921B6E5C
+  sample 63:
+    time = 1260000
+    flags = 1
+    data = length 24, hash EC11F041
+  sample 64:
+    time = 1280000
+    flags = 1
+    data = length 24, hash 5BA9E0A3
+  sample 65:
+    time = 1300000
+    flags = 1
+    data = length 24, hash DB6D52F3
+  sample 66:
+    time = 1320000
+    flags = 1
+    data = length 24, hash 8EEBE525
+  sample 67:
+    time = 1340000
+    flags = 1
+    data = length 24, hash 47A742AE
+  sample 68:
+    time = 1360000
+    flags = 1
+    data = length 24, hash E93F1E03
+  sample 69:
+    time = 1380000
+    flags = 1
+    data = length 24, hash 3251F57C
+  sample 70:
+    time = 1400000
+    flags = 1
+    data = length 24, hash 3EDBBBDD
+  sample 71:
+    time = 1420000
+    flags = 1
+    data = length 24, hash 2E98465A
+  sample 72:
+    time = 1440000
+    flags = 1
+    data = length 24, hash A09EA52E
+  sample 73:
+    time = 1460000
+    flags = 1
+    data = length 24, hash A2A86FA6
+  sample 74:
+    time = 1480000
+    flags = 1
+    data = length 24, hash 71DCD51C
+  sample 75:
+    time = 1500000
+    flags = 1
+    data = length 24, hash 2B02DEE1
+  sample 76:
+    time = 1520000
+    flags = 1
+    data = length 24, hash 7A725192
+  sample 77:
+    time = 1540000
+    flags = 1
+    data = length 24, hash 929AD483
+  sample 78:
+    time = 1560000
+    flags = 1
+    data = length 24, hash 68440BF5
+  sample 79:
+    time = 1580000
+    flags = 1
+    data = length 24, hash 5BD41AD6
+  sample 80:
+    time = 1600000
+    flags = 1
+    data = length 24, hash 91A381
+  sample 81:
+    time = 1620000
+    flags = 1
+    data = length 24, hash 8010C408
+  sample 82:
+    time = 1640000
+    flags = 1
+    data = length 24, hash 482274BE
+  sample 83:
+    time = 1660000
+    flags = 1
+    data = length 24, hash D7DB8BCC
+  sample 84:
+    time = 1680000
+    flags = 1
+    data = length 24, hash 680BD9DD
+  sample 85:
+    time = 1700000
+    flags = 1
+    data = length 24, hash E313577C
+  sample 86:
+    time = 1720000
+    flags = 1
+    data = length 24, hash 9C10B0CD
+  sample 87:
+    time = 1740000
+    flags = 1
+    data = length 24, hash 2D90AC02
+  sample 88:
+    time = 1760000
+    flags = 1
+    data = length 24, hash 64E8C245
+  sample 89:
+    time = 1780000
+    flags = 1
+    data = length 24, hash 3954AC1B
+  sample 90:
+    time = 1800000
+    flags = 1
+    data = length 24, hash ACB8999F
+  sample 91:
+    time = 1820000
+    flags = 1
+    data = length 24, hash 43AE3957
+  sample 92:
+    time = 1840000
+    flags = 1
+    data = length 24, hash 3C664DB7
+  sample 93:
+    time = 1860000
+    flags = 1
+    data = length 24, hash 9354B576
+  sample 94:
+    time = 1880000
+    flags = 1
+    data = length 24, hash B5B9C14E
+  sample 95:
+    time = 1900000
+    flags = 1
+    data = length 24, hash 7DA9C98F
+  sample 96:
+    time = 1920000
+    flags = 1
+    data = length 24, hash EFEE54C6
+  sample 97:
+    time = 1940000
+    flags = 1
+    data = length 24, hash 79DC8CBD
+  sample 98:
+    time = 1960000
+    flags = 1
+    data = length 24, hash A71A475C
+  sample 99:
+    time = 1980000
+    flags = 1
+    data = length 24, hash CA1CBB94
+  sample 100:
+    time = 2000000
+    flags = 1
+    data = length 24, hash 91922226
+  sample 101:
+    time = 2020000
+    flags = 1
+    data = length 24, hash C90278BC
+  sample 102:
+    time = 2040000
+    flags = 1
+    data = length 24, hash BD51986F
+  sample 103:
+    time = 2060000
+    flags = 1
+    data = length 24, hash 90AEF368
+  sample 104:
+    time = 2080000
+    flags = 1
+    data = length 24, hash 1D83C955
+  sample 105:
+    time = 2100000
+    flags = 1
+    data = length 24, hash 8FA9A915
+  sample 106:
+    time = 2120000
+    flags = 1
+    data = length 24, hash C6C753E0
+  sample 107:
+    time = 2140000
+    flags = 1
+    data = length 24, hash 85FA27A7
+  sample 108:
+    time = 2160000
+    flags = 1
+    data = length 24, hash A0277324
+  sample 109:
+    time = 2180000
+    flags = 1
+    data = length 24, hash B7696535
+  sample 110:
+    time = 2200000
+    flags = 1
+    data = length 24, hash D69D668C
+  sample 111:
+    time = 2220000
+    flags = 1
+    data = length 24, hash 34C057CD
+  sample 112:
+    time = 2240000
+    flags = 1
+    data = length 24, hash 4EC5E974
+  sample 113:
+    time = 2260000
+    flags = 1
+    data = length 24, hash 1C1CD40D
+  sample 114:
+    time = 2280000
+    flags = 1
+    data = length 24, hash 76CC54BC
+  sample 115:
+    time = 2300000
+    flags = 1
+    data = length 24, hash D497ACF5
+  sample 116:
+    time = 2320000
+    flags = 1
+    data = length 24, hash A1386080
+  sample 117:
+    time = 2340000
+    flags = 1
+    data = length 24, hash 7ED36954
+  sample 118:
+    time = 2360000
+    flags = 1
+    data = length 24, hash C11A3BF9
+  sample 119:
+    time = 2380000
+    flags = 1
+    data = length 24, hash 8FB69488
+  sample 120:
+    time = 2400000
+    flags = 1
+    data = length 24, hash C6225F59
+  sample 121:
+    time = 2420000
+    flags = 1
+    data = length 24, hash 122AB6D2
+  sample 122:
+    time = 2440000
+    flags = 1
+    data = length 24, hash 1E195E7D
+  sample 123:
+    time = 2460000
+    flags = 1
+    data = length 24, hash BD3DF418
+  sample 124:
+    time = 2480000
+    flags = 1
+    data = length 24, hash D8AE4A5
+  sample 125:
+    time = 2500000
+    flags = 1
+    data = length 24, hash 977BD182
+  sample 126:
+    time = 2520000
+    flags = 1
+    data = length 24, hash F361F060
+  sample 127:
+    time = 2540000
+    flags = 1
+    data = length 24, hash 11EC8CD0
+  sample 128:
+    time = 2560000
+    flags = 1
+    data = length 24, hash 3798F3D2
+  sample 129:
+    time = 2580000
+    flags = 1
+    data = length 24, hash B2C2517C
+  sample 130:
+    time = 2600000
+    flags = 1
+    data = length 24, hash FBE0D0D8
+  sample 131:
+    time = 2620000
+    flags = 1
+    data = length 24, hash 7033172F
+  sample 132:
+    time = 2640000
+    flags = 1
+    data = length 24, hash BE760029
+  sample 133:
+    time = 2660000
+    flags = 1
+    data = length 24, hash 590AF28C
+  sample 134:
+    time = 2680000
+    flags = 1
+    data = length 24, hash AD28C48F
+  sample 135:
+    time = 2700000
+    flags = 1
+    data = length 24, hash 640AA61B
+  sample 136:
+    time = 2720000
+    flags = 1
+    data = length 24, hash ABE659B
+  sample 137:
+    time = 2740000
+    flags = 1
+    data = length 24, hash ED2691D2
+  sample 138:
+    time = 2760000
+    flags = 1
+    data = length 24, hash D998C80E
+  sample 139:
+    time = 2780000
+    flags = 1
+    data = length 24, hash 8DC0DF5C
+  sample 140:
+    time = 2800000
+    flags = 1
+    data = length 24, hash 7692247B
+  sample 141:
+    time = 2820000
+    flags = 1
+    data = length 24, hash C1D1CCB9
+  sample 142:
+    time = 2840000
+    flags = 1
+    data = length 24, hash 362CE78E
+  sample 143:
+    time = 2860000
+    flags = 1
+    data = length 24, hash 54FA84A
+  sample 144:
+    time = 2880000
+    flags = 1
+    data = length 24, hash 29E88C84
+  sample 145:
+    time = 2900000
+    flags = 1
+    data = length 24, hash 1CD848AC
+  sample 146:
+    time = 2920000
+    flags = 1
+    data = length 24, hash 5C3D4A79
+  sample 147:
+    time = 2940000
+    flags = 1
+    data = length 24, hash 1AA8E604
+  sample 148:
+    time = 2960000
+    flags = 1
+    data = length 24, hash 186A4316
+  sample 149:
+    time = 2980000
+    flags = 1
+    data = length 24, hash 61ACE481
+  sample 150:
+    time = 3000000
+    flags = 1
+    data = length 24, hash D0C42780
+  sample 151:
+    time = 3020000
+    flags = 1
+    data = length 24, hash FAD51BA1
+  sample 152:
+    time = 3040000
+    flags = 1
+    data = length 24, hash F1A9AC71
+  sample 153:
+    time = 3060000
+    flags = 1
+    data = length 24, hash 24425449
+  sample 154:
+    time = 3080000
+    flags = 1
+    data = length 24, hash 37AAC3E6
+  sample 155:
+    time = 3100000
+    flags = 1
+    data = length 24, hash 91F68CB4
+  sample 156:
+    time = 3120000
+    flags = 1
+    data = length 24, hash F8C92820
+  sample 157:
+    time = 3140000
+    flags = 1
+    data = length 24, hash ECD39C3E
+  sample 158:
+    time = 3160000
+    flags = 1
+    data = length 24, hash B27D8F78
+  sample 159:
+    time = 3180000
+    flags = 1
+    data = length 24, hash C9EB3DFB
+  sample 160:
+    time = 3200000
+    flags = 1
+    data = length 24, hash 88DC54A2
+  sample 161:
+    time = 3220000
+    flags = 1
+    data = length 24, hash 7FC4C5BE
+  sample 162:
+    time = 3240000
+    flags = 1
+    data = length 24, hash E4F684EF
+  sample 163:
+    time = 3260000
+    flags = 1
+    data = length 24, hash 55C08B56
+  sample 164:
+    time = 3280000
+    flags = 1
+    data = length 24, hash E5A0F006
+  sample 165:
+    time = 3300000
+    flags = 1
+    data = length 24, hash DE3F3AA7
+  sample 166:
+    time = 3320000
+    flags = 1
+    data = length 24, hash 3F28AE7F
+  sample 167:
+    time = 3340000
+    flags = 1
+    data = length 24, hash 3949CAFF
+  sample 168:
+    time = 3360000
+    flags = 1
+    data = length 24, hash 772665A0
+tracksEnded = true
diff --git a/library/core/src/test/java/com/google/android/exoplayer2/extractor/DefaultExtractorsFactoryTest.java b/library/core/src/test/java/com/google/android/exoplayer2/extractor/DefaultExtractorsFactoryTest.java
new file mode 100644
index 0000000000..148e04ca77
--- /dev/null
+++ b/library/core/src/test/java/com/google/android/exoplayer2/extractor/DefaultExtractorsFactoryTest.java
@@ -0,0 +1,71 @@
+/*
+ * Copyright (C) 2016 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.exoplayer2.extractor;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import com.google.android.exoplayer2.extractor.amr.AmrExtractor;
+import com.google.android.exoplayer2.extractor.flv.FlvExtractor;
+import com.google.android.exoplayer2.extractor.mkv.MatroskaExtractor;
+import com.google.android.exoplayer2.extractor.mp3.Mp3Extractor;
+import com.google.android.exoplayer2.extractor.mp4.FragmentedMp4Extractor;
+import com.google.android.exoplayer2.extractor.mp4.Mp4Extractor;
+import com.google.android.exoplayer2.extractor.ogg.OggExtractor;
+import com.google.android.exoplayer2.extractor.ts.Ac3Extractor;
+import com.google.android.exoplayer2.extractor.ts.AdtsExtractor;
+import com.google.android.exoplayer2.extractor.ts.PsExtractor;
+import com.google.android.exoplayer2.extractor.ts.TsExtractor;
+import com.google.android.exoplayer2.extractor.wav.WavExtractor;
+import java.util.ArrayList;
+import java.util.List;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.robolectric.RobolectricTestRunner;
+
+/** Unit test for {@link DefaultExtractorsFactory}. */
+@RunWith(RobolectricTestRunner.class)
+public final class DefaultExtractorsFactoryTest {
+
+  @Test
+  public void testCreateExtractors_returnExpectedClasses() {
+    DefaultExtractorsFactory defaultExtractorsFactory = new DefaultExtractorsFactory();
+
+    Extractor[] extractors = defaultExtractorsFactory.createExtractors();
+    List<Class> listCreatedExtractorClasses = new ArrayList<>();
+    for (Extractor extractor : extractors) {
+      listCreatedExtractorClasses.add(extractor.getClass());
+    }
+
+    Class[] expectedExtractorClassses =
+        new Class[] {
+          MatroskaExtractor.class,
+          FragmentedMp4Extractor.class,
+          Mp4Extractor.class,
+          Mp3Extractor.class,
+          AdtsExtractor.class,
+          Ac3Extractor.class,
+          TsExtractor.class,
+          FlvExtractor.class,
+          OggExtractor.class,
+          PsExtractor.class,
+          WavExtractor.class,
+          AmrExtractor.class
+        };
+
+    assertThat(listCreatedExtractorClasses).containsNoDuplicates();
+    assertThat(listCreatedExtractorClasses).containsExactlyElementsIn(expectedExtractorClassses);
+  }
+}
diff --git a/library/core/src/test/java/com/google/android/exoplayer2/extractor/amr/AmrExtractorTest.java b/library/core/src/test/java/com/google/android/exoplayer2/extractor/amr/AmrExtractorTest.java
new file mode 100644
index 0000000000..b46612e7c3
--- /dev/null
+++ b/library/core/src/test/java/com/google/android/exoplayer2/extractor/amr/AmrExtractorTest.java
@@ -0,0 +1,246 @@
+/*
+ * Copyright (C) 2018 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.exoplayer2.extractor.amr;
+
+import static com.google.android.exoplayer2.extractor.amr.AmrExtractor.amrSignatureNb;
+import static com.google.android.exoplayer2.extractor.amr.AmrExtractor.amrSignatureWb;
+import static com.google.android.exoplayer2.extractor.amr.AmrExtractor.frameSizeBytesByTypeNb;
+import static com.google.android.exoplayer2.extractor.amr.AmrExtractor.frameSizeBytesByTypeWb;
+import static com.google.common.truth.Truth.assertThat;
+import static junit.framework.Assert.fail;
+
+import android.support.annotation.NonNull;
+import com.google.android.exoplayer2.ParserException;
+import com.google.android.exoplayer2.extractor.Extractor;
+import com.google.android.exoplayer2.extractor.PositionHolder;
+import com.google.android.exoplayer2.testutil.ExtractorAsserts;
+import com.google.android.exoplayer2.testutil.FakeExtractorInput;
+import com.google.android.exoplayer2.testutil.FakeExtractorOutput;
+import com.google.android.exoplayer2.util.Util;
+import java.io.IOException;
+import java.util.Random;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.robolectric.RobolectricTestRunner;
+
+/** Unit test for {@link AmrExtractor}. */
+@RunWith(RobolectricTestRunner.class)
+public final class AmrExtractorTest {
+
+  private static final Random RANDOM = new Random(1234);
+
+  @Test
+  public void testSniff_nonAmrSignature_returnFalse() throws IOException, InterruptedException {
+    AmrExtractor amrExtractor = setupAmrExtractorWithOutput();
+    FakeExtractorInput input = fakeExtractorInputWithData(Util.getUtf8Bytes("0#!AMR\n123"));
+
+    boolean result = amrExtractor.sniff(input);
+    assertThat(result).isFalse();
+  }
+
+  @Test
+  public void testRead_nonAmrSignature_throwParserException()
+      throws IOException, InterruptedException {
+    AmrExtractor amrExtractor = setupAmrExtractorWithOutput();
+    FakeExtractorInput input = fakeExtractorInputWithData(Util.getUtf8Bytes("0#!AMR-WB\n"));
+
+    try {
+      amrExtractor.read(input, new PositionHolder());
+      fail();
+    } catch (ParserException e) {
+      // expected
+    }
+  }
+
+  @Test
+  public void testRead_amrNb_returnParserException_forInvalidFrameType()
+      throws IOException, InterruptedException {
+    AmrExtractor amrExtractor = setupAmrExtractorWithOutput();
+
+    // Frame type 12-14 for narrow band is reserved for future usage.
+    byte[] amrFrame = newNarrowBandAmrFrameWithType(12);
+    byte[] data = joinData(amrSignatureNb(), amrFrame);
+    FakeExtractorInput input = fakeExtractorInputWithData(data);
+
+    try {
+      amrExtractor.read(input, new PositionHolder());
+      fail();
+    } catch (ParserException e) {
+      // expected
+    }
+  }
+
+  @Test
+  public void testRead_amrWb_returnParserException_forInvalidFrameType()
+      throws IOException, InterruptedException {
+    AmrExtractor amrExtractor = setupAmrExtractorWithOutput();
+
+    // Frame type 10-13 for wide band is reserved for future usage.
+    byte[] amrFrame = newWideBandAmrFrameWithType(13);
+    byte[] data = joinData(amrSignatureWb(), amrFrame);
+    FakeExtractorInput input = fakeExtractorInputWithData(data);
+
+    try {
+      amrExtractor.read(input, new PositionHolder());
+      fail();
+    } catch (ParserException e) {
+      // expected
+    }
+  }
+
+  @Test
+  public void testRead_amrNb_returnEndOfInput_ifInputEncountersEoF()
+      throws IOException, InterruptedException {
+    AmrExtractor amrExtractor = setupAmrExtractorWithOutput();
+
+    byte[] amrFrame = newNarrowBandAmrFrameWithType(3);
+    byte[] data = joinData(amrSignatureNb(), amrFrame);
+    FakeExtractorInput input = fakeExtractorInputWithData(data);
+
+    // Read 1st frame, which will put the input at EoF.
+    amrExtractor.read(input, new PositionHolder());
+
+    int result = amrExtractor.read(input, new PositionHolder());
+    assertThat(result).isEqualTo(Extractor.RESULT_END_OF_INPUT);
+  }
+
+  @Test
+  public void testRead_amrWb_returnEndOfInput_ifInputEncountersEoF()
+      throws IOException, InterruptedException {
+    AmrExtractor amrExtractor = setupAmrExtractorWithOutput();
+
+    byte[] amrFrame = newWideBandAmrFrameWithType(5);
+    byte[] data = joinData(amrSignatureWb(), amrFrame);
+    FakeExtractorInput input = fakeExtractorInputWithData(data);
+
+    // Read 1st frame, which will put the input at EoF.
+    amrExtractor.read(input, new PositionHolder());
+
+    int result = amrExtractor.read(input, new PositionHolder());
+    assertThat(result).isEqualTo(Extractor.RESULT_END_OF_INPUT);
+  }
+
+  @Test
+  public void testRead_amrNb_returnParserException_forInvalidFrameHeader()
+      throws IOException, InterruptedException {
+    AmrExtractor amrExtractor = setupAmrExtractorWithOutput();
+
+    byte[] invalidHeaderFrame = newNarrowBandAmrFrameWithType(4);
+
+    // The padding bits are at bit-1 positions in the following pattern: 1000 0011
+    // Padding bits must be 0.
+    invalidHeaderFrame[0] = (byte) (invalidHeaderFrame[0] | 0b01111101);
+
+    byte[] data = joinData(amrSignatureNb(), invalidHeaderFrame);
+    FakeExtractorInput input = fakeExtractorInputWithData(data);
+
+    try {
+      amrExtractor.read(input, new PositionHolder());
+      fail();
+    } catch (ParserException e) {
+      // expected
+    }
+  }
+
+  @Test
+  public void testRead_amrWb_returnParserException_forInvalidFrameHeader()
+      throws IOException, InterruptedException {
+    AmrExtractor amrExtractor = setupAmrExtractorWithOutput();
+
+    byte[] invalidHeaderFrame = newWideBandAmrFrameWithType(6);
+
+    // The padding bits are at bit-1 positions in the following pattern: 1000 0011
+    // Padding bits must be 0.
+    invalidHeaderFrame[0] = (byte) (invalidHeaderFrame[0] | 0b01111110);
+
+    byte[] data = joinData(amrSignatureWb(), invalidHeaderFrame);
+    FakeExtractorInput input = fakeExtractorInputWithData(data);
+
+    try {
+      amrExtractor.read(input, new PositionHolder());
+      fail();
+    } catch (ParserException e) {
+      // expected
+    }
+  }
+
+  @Test
+  public void testExtractingNarrowBandSamples() throws Exception {
+    ExtractorAsserts.assertBehavior(createAmrExtractorFactory(), "amr/sample_nb.amr");
+  }
+
+  @Test
+  public void testExtractingWideBandSamples() throws Exception {
+    ExtractorAsserts.assertBehavior(createAmrExtractorFactory(), "amr/sample_wb.amr");
+  }
+
+  private byte[] newWideBandAmrFrameWithType(int frameType) {
+    byte frameHeader = (byte) ((frameType << 3) & (0b01111100));
+    int frameContentInBytes = frameSizeBytesByTypeWb(frameType) - 1;
+
+    return joinData(new byte[] {frameHeader}, randomBytesArrayWithLength(frameContentInBytes));
+  }
+
+  private byte[] newNarrowBandAmrFrameWithType(int frameType) {
+    byte frameHeader = (byte) ((frameType << 3) & (0b01111100));
+    int frameContentInBytes = frameSizeBytesByTypeNb(frameType) - 1;
+
+    return joinData(new byte[] {frameHeader}, randomBytesArrayWithLength(frameContentInBytes));
+  }
+
+  private static byte[] randomBytesArrayWithLength(int length) {
+    byte[] result = new byte[length];
+    RANDOM.nextBytes(result);
+    return result;
+  }
+
+  private static byte[] joinData(byte[]... byteArrays) {
+    int totalLength = 0;
+    for (byte[] byteArray : byteArrays) {
+      totalLength += byteArray.length;
+    }
+    byte[] result = new byte[totalLength];
+    int offset = 0;
+    for (byte[] byteArray : byteArrays) {
+      System.arraycopy(byteArray, /* srcPos= */ 0, result, offset, byteArray.length);
+      offset += byteArray.length;
+    }
+    return result;
+  }
+
+  @NonNull
+  private static AmrExtractor setupAmrExtractorWithOutput() {
+    AmrExtractor amrExtractor = new AmrExtractor();
+    FakeExtractorOutput output = new FakeExtractorOutput();
+    amrExtractor.init(output);
+    return amrExtractor;
+  }
+
+  @NonNull
+  private static FakeExtractorInput fakeExtractorInputWithData(byte[] data) {
+    return new FakeExtractorInput.Builder().setData(data).build();
+  }
+
+  @NonNull
+  private static ExtractorAsserts.ExtractorFactory createAmrExtractorFactory() {
+    return new ExtractorAsserts.ExtractorFactory() {
+      @Override
+      public Extractor create() {
+        return new AmrExtractor();
+      }
+    };
+  }
+}