Change MetadataDecoder interface to receive a MetadataInputBuffer

This allows passing a subsampleOffsetUs as in Text decoding.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=144334172

library/src/androidTest/java/com/google/android/exoplayer2/metadata/emsg/EventMessageDecoderTest.java

@@ -17,6 +17,8 @@ package com.google.android.exoplayer2.metadata.emsg;
 
 import android.test.MoreAsserts;
 import com.google.android.exoplayer2.metadata.Metadata;
+import com.google.android.exoplayer2.metadata.MetadataInputBuffer;
+import java.nio.ByteBuffer;
 import junit.framework.TestCase;
 
 /**
@@ -34,7 +36,9 @@ public final class EventMessageDecoderTest extends TestCase {
         0, 15, 67, -45, // id = 1000403
         0, 1, 2, 3, 4}; // message_data = {0, 1, 2, 3, 4}
     EventMessageDecoder decoder = new EventMessageDecoder();
-    Metadata metadata = decoder.decode(rawEmsgBody, rawEmsgBody.length);
+    MetadataInputBuffer buffer = new MetadataInputBuffer();
+    buffer.data = ByteBuffer.allocate(rawEmsgBody.length).put(rawEmsgBody);
+    Metadata metadata = decoder.decode(buffer);
     assertEquals(1, metadata.length());
     EventMessage eventMessage = (EventMessage) metadata.get(0);
     assertEquals("urn:test", eventMessage.schemeIdUri);

library/src/main/java/com/google/android/exoplayer2/metadata/MetadataDecoder.java

@@ -29,13 +29,12 @@ public interface MetadataDecoder {
   boolean canDecode(String mimeType);
 
   /**
-   * Decodes a metadata object from the provided binary data.
+   * Decodes a {@link Metadata} element from the provided input buffer.
    *
-   * @param data The raw binary data from which to decode the metadata.
-   * @param size The size of the input data.
+   * @param inputBuffer The input buffer to decode.
    * @return The decoded metadata object.
    * @throws MetadataDecoderException If a problem occurred decoding the data.
    */
-  Metadata decode(byte[] data, int size) throws MetadataDecoderException;
+  Metadata decode(MetadataInputBuffer inputBuffer) throws MetadataDecoderException;
 
 }

library/src/main/java/com/google/android/exoplayer2/metadata/MetadataInputBuffer.java

@@ -0,0 +1,36 @@
+/*
+ * 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.metadata;
+
+import com.google.android.exoplayer2.Format;
+import com.google.android.exoplayer2.decoder.DecoderInputBuffer;
+
+/**
+ * A {@link DecoderInputBuffer} for a {@link MetadataDecoder}.
+ */
+public final class MetadataInputBuffer extends DecoderInputBuffer {
+
+  /**
+   * An offset that must be added to the metadata's timestamps after it's been decoded, or
+   * {@link Format#OFFSET_SAMPLE_RELATIVE} if {@link #timeUs} should be added.
+   */
+  public long subsampleOffsetUs;
+
+  public MetadataInputBuffer() {
+    super(DecoderInputBuffer.BUFFER_REPLACEMENT_MODE_NORMAL);
+  }
+
+}

library/src/main/java/com/google/android/exoplayer2/metadata/MetadataRenderer.java

@@ -24,9 +24,7 @@ import com.google.android.exoplayer2.C;
 import com.google.android.exoplayer2.ExoPlaybackException;
 import com.google.android.exoplayer2.Format;
 import com.google.android.exoplayer2.FormatHolder;
-import com.google.android.exoplayer2.decoder.DecoderInputBuffer;
 import com.google.android.exoplayer2.util.Assertions;
-import java.nio.ByteBuffer;
 
 /**
  * A renderer for metadata.
@@ -53,7 +51,7 @@ public final class MetadataRenderer extends BaseRenderer implements Callback {
   private final Output output;
   private final Handler outputHandler;
   private final FormatHolder formatHolder;
-  private final DecoderInputBuffer buffer;
+  private final MetadataInputBuffer buffer;
 
   private MetadataDecoder decoder;
   private boolean inputStreamEnded;
@@ -88,7 +86,7 @@ public final class MetadataRenderer extends BaseRenderer implements Callback {
     this.outputHandler = outputLooper == null ? null : new Handler(outputLooper, this);
     this.decoderFactory = Assertions.checkNotNull(decoderFactory);
     formatHolder = new FormatHolder();
-    buffer = new DecoderInputBuffer(DecoderInputBuffer.BUFFER_REPLACEMENT_MODE_NORMAL);
+    buffer = new MetadataInputBuffer();
   }
 
   @Override
@@ -117,10 +115,10 @@ public final class MetadataRenderer extends BaseRenderer implements Callback {
           inputStreamEnded = true;
         } else {
           pendingMetadataTimestamp = buffer.timeUs;
+          buffer.subsampleOffsetUs = formatHolder.format.subsampleOffsetUs;
+          buffer.flip();
           try {
-            buffer.flip();
-            ByteBuffer bufferData = buffer.data;
-            pendingMetadata = decoder.decode(bufferData.array(), bufferData.limit());
+            pendingMetadata = decoder.decode(buffer);
           } catch (MetadataDecoderException e) {
             throw ExoPlaybackException.createForRenderer(e, getIndex());
           }

library/src/main/java/com/google/android/exoplayer2/metadata/emsg/EventMessageDecoder.java

@@ -17,8 +17,10 @@ package com.google.android.exoplayer2.metadata.emsg;
 
 import com.google.android.exoplayer2.metadata.Metadata;
 import com.google.android.exoplayer2.metadata.MetadataDecoder;
+import com.google.android.exoplayer2.metadata.MetadataInputBuffer;
 import com.google.android.exoplayer2.util.MimeTypes;
 import com.google.android.exoplayer2.util.ParsableByteArray;
+import java.nio.ByteBuffer;
 import java.util.Arrays;
 
 /**
@@ -35,7 +37,10 @@ public final class EventMessageDecoder implements MetadataDecoder {
   }
 
   @Override
-  public Metadata decode(byte[] data, int size) {
+  public Metadata decode(MetadataInputBuffer inputBuffer) {
+    ByteBuffer buffer = inputBuffer.data;
+    byte[] data = buffer.array();
+    int size = buffer.limit();
     ParsableByteArray emsgData = new ParsableByteArray(data, size);
     String schemeIdUri = emsgData.readNullTerminatedString();
     String value = emsgData.readNullTerminatedString();

library/src/main/java/com/google/android/exoplayer2/metadata/id3/Id3Decoder.java

@@ -18,10 +18,12 @@ package com.google.android.exoplayer2.metadata.id3;
 import android.util.Log;
 import com.google.android.exoplayer2.metadata.Metadata;
 import com.google.android.exoplayer2.metadata.MetadataDecoder;
+import com.google.android.exoplayer2.metadata.MetadataInputBuffer;
 import com.google.android.exoplayer2.util.MimeTypes;
 import com.google.android.exoplayer2.util.ParsableByteArray;
 import com.google.android.exoplayer2.util.Util;
 import java.io.UnsupportedEncodingException;
+import java.nio.ByteBuffer;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
@@ -54,6 +56,18 @@ public final class Id3Decoder implements MetadataDecoder {
   }
 
   @Override
+  public Metadata decode(MetadataInputBuffer inputBuffer) {
+    ByteBuffer buffer = inputBuffer.data;
+    return decode(buffer.array(), buffer.limit());
+  }
+
+  /**
+   * Decodes ID3 tags.
+   *
+   * @param data The bytes to decode ID3 tags from.
+   * @param size Amount of bytes in {@code data} to read.
+   * @return A {@link Metadata} object containing the decoded ID3 tags.
+   */
   public Metadata decode(byte[] data, int size) {
     List<Id3Frame> id3Frames = new ArrayList<>();
     ParsableByteArray id3Data = new ParsableByteArray(data, size);

library/src/main/java/com/google/android/exoplayer2/metadata/scte35/SpliceInfoDecoder.java

@@ -19,9 +19,11 @@ import android.text.TextUtils;
 import com.google.android.exoplayer2.metadata.Metadata;
 import com.google.android.exoplayer2.metadata.MetadataDecoder;
 import com.google.android.exoplayer2.metadata.MetadataDecoderException;
+import com.google.android.exoplayer2.metadata.MetadataInputBuffer;
 import com.google.android.exoplayer2.util.MimeTypes;
 import com.google.android.exoplayer2.util.ParsableBitArray;
 import com.google.android.exoplayer2.util.ParsableByteArray;
+import java.nio.ByteBuffer;
 
 /**
  * Decodes splice info sections and produces splice commands.
@@ -48,7 +50,10 @@ public final class SpliceInfoDecoder implements MetadataDecoder {
   }
 
   @Override
-  public Metadata decode(byte[] data, int size) throws MetadataDecoderException {
+  public Metadata decode(MetadataInputBuffer inputBuffer) throws MetadataDecoderException {
+    ByteBuffer buffer = inputBuffer.data;
+    byte[] data = buffer.array();
+    int size = buffer.limit();
     sectionData.reset(data, size);
     sectionHeader.reset(data, size);
     // table_id(8), section_syntax_indicator(1), private_indicator(1), reserved(2),