Fix format equality checking.

For Live SmoothStreaming, referential equality checking
isn't enough (it breaks once the manifest is updated).
Updated other instances too just for consistency.

library/src/main/java/com/google/android/exoplayer/chunk/FormatEvaluator.java

@@ -129,7 +129,7 @@ public interface FormatEvaluator {
     public void evaluate(List<? extends MediaChunk> queue, long playbackPositionUs,
         Format[] formats, Evaluation evaluation) {
       Format newFormat = formats[random.nextInt(formats.length)];
-      if (evaluation.format != null && !evaluation.format.id.equals(newFormat.id)) {
+      if (evaluation.format != null && !evaluation.format.equals(newFormat)) {
         evaluation.trigger = Chunk.TRIGGER_ADAPTIVE;
       }
       evaluation.format = newFormat;

library/src/main/java/com/google/android/exoplayer/dash/DashChunkSource.java

@@ -304,7 +304,7 @@ public class DashChunkSource implements ChunkSource {
       out.chunk = null;
       return;
     } else if (out.queueSize == queue.size() && out.chunk != null
-        && out.chunk.format.id.equals(selectedFormat.id)) {
+        && out.chunk.format.equals(selectedFormat)) {
       // We already have a chunk, and the evaluation hasn't changed either the format or the size
       // of the queue. Leave unchanged.
       return;

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

@@ -587,7 +587,7 @@ public class HlsChunkSource {
 
   private int getVariantIndex(Format format) {
     for (int i = 0; i < variants.size(); i++) {
-      if (format == variants.get(i).format) {
+      if (variants.get(i).format.equals(format)) {
         return i;
       }
     }

library/src/main/java/com/google/android/exoplayer/smoothstreaming/SmoothStreamingChunkSource.java

@@ -248,7 +248,7 @@ public class SmoothStreamingChunkSource implements ChunkSource {
       out.chunk = null;
       return;
     } else if (out.queueSize == queue.size() && out.chunk != null
-        && out.chunk.format.id.equals(evaluation.format.id)) {
+        && out.chunk.format.equals(evaluation.format)) {
       // We already have a chunk, and the evaluation hasn't changed either the format or the size
       // of the queue. Do nothing.
       return;
@@ -352,7 +352,7 @@ public class SmoothStreamingChunkSource implements ChunkSource {
   private int getTrackIndex(Format format) {
     TrackElement[] tracks = currentManifest.streamElements[streamElementIndex].tracks;
     for (int i = 0; i < tracks.length; i++) {
-      if (format == tracks[i].format) {
+      if (tracks[i].format.equals(format)) {
         return i;
       }
     }