Rename ParsableByteArray.length() to limit(). Add capacity().

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

@@ -638,7 +638,7 @@ public final class FragmentedMp4Extractor implements Extractor {
     }
 
     Arrays.fill(out.sampleHasSubsampleEncryptionTable, 0, sampleCount, subsampleEncryption);
-    out.initEncryptionData(senc.length() - senc.getPosition());
+    out.initEncryptionData(senc.bytesLeft());
     out.fillEncryptionData(senc);
   }
 
@@ -696,7 +696,7 @@ public final class FragmentedMp4Extractor implements Extractor {
       offset += sizes[i];
     }
 
-    return new SegmentIndex(atom.length(), sizes, offsets, durationsUs, timesUs);
+    return new SegmentIndex(atom.limit(), sizes, offsets, durationsUs, timesUs);
   }
 
   private int readEncryptionData(NonBlockingInputStream inputStream) {

library/src/main/java/com/google/android/exoplayer/chunk/parser/mp4/TrackFragment.java

@@ -113,7 +113,7 @@ import com.google.android.exoplayer.util.ParsableByteArray;
    * @param length The length in bytes of the encryption data.
    */
   public void initEncryptionData(int length) {
-    if (sampleEncryptionData == null || sampleEncryptionData.length() < length) {
+    if (sampleEncryptionData == null || sampleEncryptionData.limit() < length) {
       sampleEncryptionData = new ParsableByteArray(length);
     }
     sampleEncryptionDataLength = length;

library/src/main/java/com/google/android/exoplayer/hls/parser/AdtsReader.java

@@ -128,7 +128,7 @@ import java.util.Collections;
   private boolean skipToNextSync(ParsableByteArray pesBuffer) {
     byte[] adtsData = pesBuffer.data;
     int startOffset = pesBuffer.getPosition();
-    int endOffset = pesBuffer.length();
+    int endOffset = pesBuffer.limit();
     for (int i = startOffset; i < endOffset; i++) {
       boolean byteIsOxFF = (adtsData[i] & 0xFF) == 0xFF;
       boolean found = lastByteWasOxFF && !byteIsOxFF && (adtsData[i] & 0xF0) == 0xF0;

library/src/main/java/com/google/android/exoplayer/hls/parser/H264Reader.java

@@ -90,7 +90,7 @@ import java.util.List;
    */
   private boolean readToNextAudUnit(ParsableByteArray data, long pesTimeUs) {
     int pesOffset = data.getPosition();
-    int pesLimit = data.length();
+    int pesLimit = data.limit();
 
     // TODO: We probably need to handle the case where the AUD start code was split across the
     // previous and current data buffers.

library/src/main/java/com/google/android/exoplayer/util/ParsableByteArray.java

@@ -73,9 +73,8 @@ public final class ParsableByteArray {
     return limit - position;
   }
 
-  /** Returns the number of bytes in the array. */
-  // TODO: Rename to limit.
-  public int length() {
+  /** Returns the limit. */
+  public int limit() {
     return limit;
   }
 
@@ -94,6 +93,11 @@ public final class ParsableByteArray {
     return position;
   }
 
+  /** Returns the capacity of the array, which may be larger than the limit. */
+  public int capacity() {
+    return data == null ? 0 : data.length;
+  }
+
   /**
    * Sets the reading offset in the array.
    *