Fix handling of widths/heights when choosing formats.

- Make HlsPlaylistParser treat non-positive dimensions as unknown.
- Make HlsPlaylistParser parse floating point resolutions, because
  technically that's how they're spec'd.
- Make VideoFormatSelectorUtil treat non-position dimensions as unknown.

Issue: google#461

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

@@ -108,7 +108,7 @@ public static int[] selectVideoFormats(List<? extends FormatWrapper> formatWrapp
         // Keep track of the number of pixels of the selected format whose resolution is the
         // smallest to exceed the maximum size at which it can be displayed within the viewport.
         // We'll discard formats of higher resolution in a second pass.
-        if (format.width != -1 && format.height != -1) {
+        if (format.width > 0 && format.height > 0) {
           Point maxVideoSizeInViewport = getMaxVideoSizeInViewport(orientationMayChange,
               viewportWidth, viewportHeight, format.width, format.height);
           int videoPixels = format.width * format.height;
@@ -126,7 +126,7 @@ public static int[] selectVideoFormats(List<? extends FormatWrapper> formatWrapp
     // viewport.
     for (int i = selectedIndexList.size() - 1; i >= 0; i--) {
       Format format = formatWrappers.get(i).getFormat();
-      if (format.width != -1 && format.height != -1
+      if (format.width > 0 && format.height > 0
           && format.width * format.height > maxVideoPixelsToRetain) {
         selectedIndexList.remove(i);
       }
@@ -150,7 +150,7 @@ private static boolean isFormatPlayable(Format format, String[] allowedContainer
       // Filtering format because it's HD.
       return false;
     }
-    if (format.width != -1 && format.height != -1) {
+    if (format.width > 0 && format.height > 0) {
       // TODO: Use MediaCodecUtil.isSizeAndRateSupportedV21 on API levels >= 21 if we know the
       // mimeType of the media samples within the container. Remove the assumption that we're
       // dealing with H.264.

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

@@ -51,15 +51,15 @@ public static double parseDoubleAttr(String line, Pattern pattern, String tag)
 
   public static String parseOptionalStringAttr(String line, Pattern pattern) {
     Matcher matcher = pattern.matcher(line);
-    if (matcher.find() && matcher.groupCount() == 1) {
+    if (matcher.find()) {
       return matcher.group(1);
     }
     return null;
   }
 
   public static boolean parseOptionalBooleanAttr(String line, Pattern pattern) {
     Matcher matcher = pattern.matcher(line);
-    if (matcher.find() && matcher.groupCount() == 1) {
+    if (matcher.find()) {
       return BOOLEAN_YES.equals(matcher.group(1));
     }
     return false;

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

@@ -72,7 +72,7 @@ public final class HlsPlaylistParser implements UriLoadable.Parser<HlsPlaylist>
   private static final Pattern CODECS_ATTR_REGEX =
       Pattern.compile(CODECS_ATTR + "=\"(.+?)\"");
   private static final Pattern RESOLUTION_ATTR_REGEX =
-      Pattern.compile(RESOLUTION_ATTR + "=(\\d+x\\d+)");
+      Pattern.compile(RESOLUTION_ATTR + "=(\\d+(\\.\\d+)?x\\d+(\\.\\d+)?)");
   private static final Pattern MEDIA_DURATION_REGEX =
       Pattern.compile(MEDIA_DURATION_TAG + ":([\\d.]+),");
   private static final Pattern MEDIA_SEQUENCE_REGEX =
@@ -168,8 +168,16 @@ private static HlsMasterPlaylist parseMasterPlaylist(LineIterator iterator, Stri
             RESOLUTION_ATTR_REGEX);
         if (resolutionString != null) {
           String[] widthAndHeight = resolutionString.split("x");
-          width = Integer.parseInt(widthAndHeight[0]);
-          height = Integer.parseInt(widthAndHeight[1]);
+          width = Math.round(Float.parseFloat(widthAndHeight[0]));
+          if (width <= 0) {
+            // Width was invalid.
+            width = -1;
+          }
+          height = Math.round(Float.parseFloat(widthAndHeight[1]));
+          if (height <= 0) {
+            // Height was invalid.
+            height = -1;
+          }
         } else {
           width = -1;
           height = -1;