Expose more sensible HLS track information.

- Video track is always marked as adaptive, the resolution is
  stripped out (since it's otherwise just set to whatever the
  resolution of the first selected variant is), and the max
  dimensions are set.

Issue #514

demo/src/main/java/com/google/android/exoplayer/demo/PlayerActivity.java

@@ -451,9 +451,9 @@ public class PlayerActivity extends Activity implements SurfaceHolder.Callback,
     if (format.adaptive) {
       return "auto";
     } else if (MimeTypes.isVideo(format.mimeType)) {
-      return format.width + "x" + format.height + buildBitrateString(format);
+      return buildResolutionString(format) + buildBitrateString(format);
     } else if (MimeTypes.isAudio(format.mimeType)) {
-      return format.channelCount + "ch, " + format.sampleRate + "Hz" + buildBitrateString(format);
+      return buildAudioPropertyString(format) + buildBitrateString(format);
     } else if (MimeTypes.isText(format.mimeType) && !TextUtils.isEmpty(format.language)) {
       return format.language + buildBitrateString(format);
     } else {
@@ -461,6 +461,16 @@ public class PlayerActivity extends Activity implements SurfaceHolder.Callback,
     }
   }
 
+  private static String buildResolutionString(MediaFormat format) {
+    return format.width == MediaFormat.NO_VALUE || format.height == MediaFormat.NO_VALUE
+        ? "video" : format.width + "x" + format.height;
+  }
+
+  private static String buildAudioPropertyString(MediaFormat format) {
+    return format.channelCount == MediaFormat.NO_VALUE || format.sampleRate == MediaFormat.NO_VALUE
+        ? "audio" : format.channelCount + "ch, " + format.sampleRate + "Hz";
+  }
+
   private static String buildBitrateString(MediaFormat format) {
     return format.bitrate == MediaFormat.NO_VALUE ? ""
         : String.format(Locale.US, " (%.2fMbit)", format.bitrate / 1000000f);

demo/src/main/res/values/strings.xml

@@ -37,14 +37,10 @@
 
   <string name="off">[off]</string>
 
-  <string name="on">[on]</string>
-
   <string name="drm_error_not_supported">Protected content not supported on API levels below 18</string>
 
   <string name="drm_error_unsupported_scheme">This device does not support the required DRM scheme</string>
 
   <string name="drm_error_unknown">An unknown DRM error occurred</string>
 
-  <string name="failed">Playback failed</string>
-
 </resources>

library/src/main/java/com/google/android/exoplayer/MediaFormat.java

@@ -235,9 +235,9 @@ public final class MediaFormat {
   }
 
   public MediaFormat copyAsAdaptive() {
-    return new MediaFormat(mimeType, NO_VALUE, maxInputSize, durationUs, width, height,
-        rotationDegrees, pixelWidthHeightRatio, channelCount, sampleRate, language,
-        subsampleOffsetUs, initializationData, true, maxWidth, maxHeight);
+    return new MediaFormat(mimeType, NO_VALUE, NO_VALUE, durationUs, NO_VALUE, NO_VALUE,
+        NO_VALUE, NO_VALUE, NO_VALUE, NO_VALUE, null, OFFSET_SAMPLE_RELATIVE, null, true, maxWidth,
+        maxHeight);
   }
 
   /**

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

@@ -29,6 +29,7 @@ import com.google.android.exoplayer.chunk.Format;
 import com.google.android.exoplayer.upstream.Loader;
 import com.google.android.exoplayer.upstream.Loader.Loadable;
 import com.google.android.exoplayer.util.Assertions;
+import com.google.android.exoplayer.util.MimeTypes;
 
 import android.os.Handler;
 import android.os.SystemClock;
@@ -135,9 +136,12 @@ public final class HlsSampleSource implements SampleSource, SampleSourceReader,
         pendingDiscontinuities = new boolean[trackCount];
         downstreamMediaFormats = new MediaFormat[trackCount];
         mediaFormats = new MediaFormat[trackCount];
+        long durationUs = chunkSource.getDurationUs();
         for (int i = 0; i < trackCount; i++) {
-          mediaFormats[i] = extractor.getMediaFormat(i).copyWithDurationUs(
-              chunkSource.getDurationUs());
+          mediaFormats[i] = extractor.getMediaFormat(i).copyWithDurationUs(durationUs);
+          if (MimeTypes.isVideo(mediaFormats[i].mimeType)) {
+            mediaFormats[i] = chunkSource.getMaxVideoDimensions(mediaFormats[i]).copyAsAdaptive();
+          }
         }
         prepared = true;
         return true;