Copy from V1: Extractor.release() method releases all kept resources.

This method is needed by FlacExtractor to release native resources.
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=119143922

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

@@ -97,4 +97,8 @@ public interface Extractor {
    */
   void seek();
 
+  /**
+   * Releases all kept resources.
+   */
+  void release();
 }

library/src/main/java/com/google/android/exoplayer/extractor/flv/FlvExtractor.java

@@ -120,6 +120,11 @@ public final class FlvExtractor implements Extractor, SeekMap {
   }
 
   @Override
+  public void release() {
+    // Do nothing
+  }
+
+  @Override
   public int read(ExtractorInput input, PositionHolder seekPosition) throws IOException,
       InterruptedException {
     while (true) {

library/src/main/java/com/google/android/exoplayer/extractor/mkv/MatroskaExtractor.java

@@ -273,6 +273,11 @@ public final class MatroskaExtractor implements Extractor {
   }
 
   @Override
+  public void release() {
+    // Do nothing
+  }
+
+  @Override
   public int read(ExtractorInput input, PositionHolder seekPosition) throws IOException,
       InterruptedException {
     sampleRead = false;

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

@@ -111,6 +111,11 @@ public final class Mp3Extractor implements Extractor {
   }
 
   @Override
+  public void release() {
+    // Do nothing
+  }
+
+  @Override
   public int read(ExtractorInput input, PositionHolder seekPosition)
       throws IOException, InterruptedException {
     if (synchronizedHeaderData == 0 && !synchronizeCatchingEndOfInput(input)) {

library/src/main/java/com/google/android/exoplayer/extractor/mp4/FragmentedMp4Extractor.java

@@ -170,6 +170,11 @@ public final class FragmentedMp4Extractor implements Extractor {
   }
 
   @Override
+  public void release() {
+    // Do nothing
+  }
+
+  @Override
   public int read(ExtractorInput input, PositionHolder seekPosition)
       throws IOException, InterruptedException {
     while (true) {

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

@@ -107,6 +107,11 @@ public final class Mp4Extractor implements Extractor, SeekMap {
   }
 
   @Override
+  public void release() {
+    // Do nothing
+  }
+
+  @Override
   public int read(ExtractorInput input, PositionHolder seekPosition)
       throws IOException, InterruptedException {
     while (true) {

library/src/main/java/com/google/android/exoplayer/extractor/ogg/OggVorbisExtractor.java

@@ -94,6 +94,11 @@ public final class OggVorbisExtractor implements Extractor, SeekMap {
   }
 
   @Override
+  public void release() {
+    // Do nothing
+  }
+
+  @Override
   public int read(ExtractorInput input, PositionHolder seekPosition)
       throws IOException, InterruptedException {
 

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

@@ -122,6 +122,11 @@ public final class AdtsExtractor implements Extractor {
   }
 
   @Override
+  public void release() {
+    // Do nothing
+  }
+
+  @Override
   public int read(ExtractorInput input, PositionHolder seekPosition)
       throws IOException, InterruptedException {
     int bytesRead = input.read(packetBuffer.data, 0, MAX_PACKET_SIZE);

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

@@ -121,6 +121,11 @@ public final class PsExtractor implements Extractor {
   }
 
   @Override
+  public void release() {
+    // Do nothing
+  }
+
+  @Override
   public int read(ExtractorInput input, PositionHolder seekPosition)
       throws IOException, InterruptedException {
     // First peek and check what type of start code is next.

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

@@ -124,6 +124,11 @@ public final class TsExtractor implements Extractor {
   }
 
   @Override
+  public void release() {
+    // Do nothing
+  }
+
+  @Override
   public int read(ExtractorInput input, PositionHolder seekPosition)
       throws IOException, InterruptedException {
     if (!input.readFully(tsPacketBuffer.data, 0, TS_PACKET_SIZE, true)) {

library/src/main/java/com/google/android/exoplayer/extractor/wav/WavExtractor.java

@@ -59,6 +59,11 @@ public final class WavExtractor implements Extractor, SeekMap {
   }
 
   @Override
+  public void release() {
+    // Do nothing
+  }
+
+  @Override
   public int read(ExtractorInput input, PositionHolder seekPosition)
       throws IOException, InterruptedException {
     if (wavHeader == null) {

library/src/main/java/com/google/android/exoplayer/hls/WebvttExtractor.java

@@ -87,6 +87,11 @@ import java.util.regex.Pattern;
   }
 
   @Override
+  public void release() {
+    // Do nothing
+  }
+
+  @Override
   public int read(ExtractorInput input, PositionHolder seekPosition)
       throws IOException, InterruptedException {
     int currentFileSize = (int) input.getLength();