Simplify default temporal layers.

webrtc/modules/video_coding/codecs/vp8/default_temporal_layers.h

Index: webrtc/modules/video_coding/codecs/vp8/default_temporal_layers.h
diff --git a/webrtc/modules/video_coding/codecs/vp8/default_temporal_layers.h b/webrtc/modules/video_coding/codecs/vp8/default_temporal_layers.h
index 0cd0b06451045560b55a235dff4f89d39902510c..446d162c3e8ce9a4370cacfda0e14405e5f9915a 100644
--- a/webrtc/modules/video_coding/codecs/vp8/default_temporal_layers.h
+++ b/webrtc/modules/video_coding/codecs/vp8/default_temporal_layers.h
@@ -20,6 +20,44 @@
 
 namespace webrtc {
 
+enum TemporalBufferUsage {
+  kNone = 0,
+  kReference = 1,
+  kUpdate = 2,
+  kReferenceAndUpdate = kReference | kUpdate,
+};
+enum TemporalFlags { kLayerSync = 1, kFreezeEntropy = 2 };
+
+struct TemporalReferences {
+  TemporalReferences(TemporalBufferUsage last,
+                     TemporalBufferUsage golden,
+                     TemporalBufferUsage arf);
+  TemporalReferences(TemporalBufferUsage last,
+                     TemporalBufferUsage golden,
+                     TemporalBufferUsage arf,
+                     int extra_flags);
+
+  const bool reference_last;
+  const bool update_last;
+  const bool reference_golden;
+  const bool update_golden;
+  const bool reference_arf;
+  const bool update_arf;
+
+  // TODO(pbos): Consider breaking these out of here and returning only a
+  // pattern index that needs to be returned to fill CodecSpecificInfoVP8 or
+  // EncodeFlags.
+  const bool layer_sync;
+  const bool freeze_entropy;
+
+ private:
+  TemporalReferences(TemporalBufferUsage last,
+                     TemporalBufferUsage golden,
+                     TemporalBufferUsage arf,
+                     bool layer_sync,
+                     bool freeze_entropy);
+};
+
 class DefaultTemporalLayers : public TemporalLayers {
  public:
   DefaultTemporalLayers(int number_of_temporal_layers,
@@ -47,46 +85,10 @@ class DefaultTemporalLayers : public TemporalLayers {
   int CurrentLayerId() const override;
 
  private:
-  enum TemporalReferences {
-    // For 1 layer case: reference all (last, golden, and alt ref), but only
-    // update last.
-    kTemporalUpdateLastRefAll = 12,
-    // First base layer frame for 3 temporal layers, which updates last and
-    // golden with alt ref dependency.
-    kTemporalUpdateLastAndGoldenRefAltRef = 11,
-    // First enhancement layer with alt ref dependency.
-    kTemporalUpdateGoldenRefAltRef = 10,
-    // First enhancement layer with alt ref dependency.
-    kTemporalUpdateGoldenWithoutDependencyRefAltRef = 9,
-    // Base layer with alt ref dependency.
-    kTemporalUpdateLastRefAltRef = 8,
-    // Highest enhacement layer without dependency on golden with alt ref
-    // dependency.
-    kTemporalUpdateNoneNoRefGoldenRefAltRef = 7,
-    // Second layer and last frame in cycle, for 2 layers.
-    kTemporalUpdateNoneNoRefAltref = 6,
-    // Highest enhancement layer.
-    kTemporalUpdateNone = 5,
-    // Second enhancement layer.
-    kTemporalUpdateAltref = 4,
-    // Second enhancement layer without dependency on previous frames in
-    // the second enhancement layer.
-    kTemporalUpdateAltrefWithoutDependency = 3,
-    // First enhancement layer.
-    kTemporalUpdateGolden = 2,
-    // First enhancement layer without dependency on previous frames in
-    // the first enhancement layer.
-    kTemporalUpdateGoldenWithoutDependency = 1,
-    // Base layer.
-    kTemporalUpdateLast = 0,
-  };
-  enum { kMaxTemporalPattern = 16 };
-
-  const int number_of_temporal_layers_;
-  int temporal_ids_length_;
-  int temporal_ids_[kMaxTemporalPattern];
-  int temporal_pattern_length_;
-  TemporalReferences temporal_pattern_[kMaxTemporalPattern];
+  const size_t num_layers_;
+  const std::vector<unsigned int> temporal_ids_;
+  const std::vector<TemporalReferences> temporal_pattern_;
+
   uint8_t tl0_pic_idx_;
   uint8_t pattern_idx_;
   uint32_t timestamp_;