Fix issue where padding was not skipped when reading odd-sized chunks from WAV files

RELEASENOTES.md

@@ -19,6 +19,8 @@
     *   Add support for composition-level audio effects.
 *   Track Selection:
 *   Extractors:
+    *   Fix issue where padding was not skipped when reading odd-sized chunks
+        from WAV files ([#1117](https://github.com/androidx/media/pull/1117)).
 *   Audio:
     *   Allow renderer recovery by disabling offload if audio track fails to
         initialize in offload mode.

libraries/extractor/src/main/java/androidx/media3/extractor/wav/WavHeaderReader.java

@@ -172,6 +172,12 @@ private static ChunkHeader skipToChunk(
     while (chunkHeader.id != chunkId) {
       Log.w(TAG, "Ignoring unknown WAV chunk: " + chunkHeader.id);
       long bytesToSkip = ChunkHeader.SIZE_IN_BYTES + chunkHeader.size;
+      // According to the RIFF specification, if a chunk's body size is odd, it's followed by a
+      // padding byte of value 0. This ensures each chunk occupies an even number of bytes in the
+      // file. The padding byte isn't included in the size field.
+      if (chunkHeader.size % 2 != 0) {
+        bytesToSkip++; // padding present if size is odd, skip it.
+      }
       if (bytesToSkip > Integer.MAX_VALUE) {
         throw ParserException.createForUnsupportedContainerFeature(
             "Chunk is too large (~2GB+) to skip; id: " + chunkHeader.id);

libraries/extractor/src/test/java/androidx/media3/extractor/wav/WavExtractorTest.java

@@ -48,6 +48,15 @@ public void sample_withTrailingBytes_extractsSameData() throws Exception {
         simulationConfig);
   }
 
+  @Test
+  public void sample_withOddMetadataChunkSize_extractsSameData() throws Exception {
+    ExtractorAsserts.assertBehavior(
+        WavExtractor::new,
+        "media/wav/sample_with_odd_metadata_chunk_size.wav",
+        new AssertionConfig.Builder().setDumpFilesPrefix("extractordumps/wav/sample.wav").build(),
+        simulationConfig);
+  }
+
   @Test
   public void sample_imaAdpcm() throws Exception {
     ExtractorAsserts.assertBehavior(