Allow empty values in ICY metadata

Issue: #5876
PiperOrigin-RevId: 248119726

RELEASENOTES.md

@@ -4,7 +4,7 @@
 
 
 * Fix NPE when using HLS chunkless preparation
 * Fix NPE when using HLS chunkless preparation
   ([#5868](https://github.com/google/ExoPlayer/issues/5868)).
   ([#5868](https://github.com/google/ExoPlayer/issues/5868)).
-* Fix handling of line terminators in SHOUTcast ICY metadata
+* Fix handling of empty values and line terminators in SHOUTcast ICY metadata
   ([#5876](https://github.com/google/ExoPlayer/issues/5876)).
   ([#5876](https://github.com/google/ExoPlayer/issues/5876)).
 * Assume that encrypted content requires secure decoders in renderer support
 * Assume that encrypted content requires secure decoders in renderer support
   checks ([#5568](https://github.com/google/ExoPlayer/issues/5568)).
   checks ([#5568](https://github.com/google/ExoPlayer/issues/5568)).

library/core/src/main/java/com/google/android/exoplayer2/metadata/icy/IcyDecoder.java

@@ -31,7 +31,7 @@ public final class IcyDecoder implements MetadataDecoder {
 
 
   private static final String TAG = "IcyDecoder";
   private static final String TAG = "IcyDecoder";
 
 
-  private static final Pattern METADATA_ELEMENT = Pattern.compile("(.+?)='(.+?)';", Pattern.DOTALL);
+  private static final Pattern METADATA_ELEMENT = Pattern.compile("(.+?)='(.*?)';", Pattern.DOTALL);
   private static final String STREAM_KEY_NAME = "streamtitle";
   private static final String STREAM_KEY_NAME = "streamtitle";
   private static final String STREAM_KEY_URL = "streamurl";
   private static final String STREAM_KEY_URL = "streamurl";
 
 

library/core/src/test/java/com/google/android/exoplayer2/metadata/icy/IcyDecoderTest.java

@@ -49,6 +49,17 @@ public final class IcyDecoderTest {
   }
   }
 
 
   @Test
   @Test
+  public void decode_emptyTitle() {
+    IcyDecoder decoder = new IcyDecoder();
+    Metadata metadata = decoder.decode("StreamTitle='';StreamURL='test_url';");
+
+    assertThat(metadata.length()).isEqualTo(1);
+    IcyInfo streamInfo = (IcyInfo) metadata.get(0);
+    assertThat(streamInfo.title).isEmpty();
+    assertThat(streamInfo.url).isEqualTo("test_url");
+  }
+
+  @Test
   public void decode_semiColonInTitle() {
   public void decode_semiColonInTitle() {
     IcyDecoder decoder = new IcyDecoder();
     IcyDecoder decoder = new IcyDecoder();
     Metadata metadata = decoder.decode("StreamTitle='test; title';StreamURL='test_url';");
     Metadata metadata = decoder.decode("StreamTitle='test; title';StreamURL='test_url';");