Base screenshare layers on TemporalReferences.

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

 /* Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree. An additional intellectual property rights grant can be found
 *  in the file PATENTS.  All contributing project authors may
 *  be found in the AUTHORS file in the root of the source tree.
 */
 /*
 * This file defines the interface for doing temporal layers with VP8.
 */
 #ifndef WEBRTC_MODULES_VIDEO_CODING_CODECS_VP8_TEMPORAL_LAYERS_H_
 #define WEBRTC_MODULES_VIDEO_CODING_CODECS_VP8_TEMPORAL_LAYERS_H_
 
 #include <vector>
 
 #include "webrtc/common_video/include/video_image.h"
 #include "webrtc/typedefs.h"
 
 struct vpx_codec_enc_cfg;
 typedef struct vpx_codec_enc_cfg vpx_codec_enc_cfg_t;
 
 namespace webrtc {
 
 struct CodecSpecificInfoVP8;
 
+enum TemporalBufferFlags {
+  kNone = 0,
+  kReference = 1,
+  kUpdate = 2,
+  kReferenceAndUpdate = kReference | kUpdate,
+};
+
+enum TemporalFlags { kLayerSync = 1, kFreezeEntropy = 2 };
+
+struct TemporalReferences {
+  TemporalReferences(TemporalBufferFlags last,
+                     TemporalBufferFlags golden,
+                     TemporalBufferFlags arf);
+  TemporalReferences(TemporalBufferFlags last,
+                     TemporalBufferFlags golden,
+                     TemporalBufferFlags arf,
+                     int extra_flags);
+
+  const bool drop_frame;
+  const TemporalBufferFlags last_buffer_flags;
+  const TemporalBufferFlags golden_buffer_flags;
+  const TemporalBufferFlags arf_buffer_flags;
+
+  // 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(TemporalBufferFlags last,
+                     TemporalBufferFlags golden,
+                     TemporalBufferFlags arf,
+                     bool layer_sync,
+                     bool freeze_entropy);
+};
+
 class TemporalLayers {
  public:
   // Factory for TemporalLayer strategy. Default behavior is a fixed pattern
   // of temporal layers. See default_temporal_layers.cc
   virtual ~TemporalLayers() {}
 
   // Returns the recommended VP8 encode flags needed. May refresh the decoder
   // and/or update the reference buffers.
-  virtual int EncodeFlags(uint32_t timestamp) = 0;
+  virtual TemporalReferences UpdateLayerConfig(uint32_t timestamp) = 0;
+
+  int EncodeFlags(uint32_t timestamp);
 
   // Update state based on new bitrate target and incoming framerate.
   // Returns the bitrate allocation for the active temporal layers.
   virtual std::vector<uint32_t> OnRatesUpdated(int bitrate_kbps,
                                                int max_bitrate_kbps,
                                                int framerate) = 0;
 
   // Update the encoder configuration with target bitrates or other parameters.
   // Returns true iff the configuration was actually modified.
   virtual bool UpdateConfiguration(vpx_codec_enc_cfg_t* cfg) = 0;
 
-  virtual void PopulateCodecSpecific(bool base_layer_sync,
+  virtual void PopulateCodecSpecific(bool is_keyframe,
                                      CodecSpecificInfoVP8* vp8_info,
                                      uint32_t timestamp) = 0;
 
-  virtual void FrameEncoded(unsigned int size, uint32_t timestamp, int qp) = 0;
+  virtual void FrameEncoded(unsigned int size, int qp) = 0;
 
   virtual int CurrentLayerId() const = 0;
 };
 
 class TemporalLayersListener;
 class TemporalLayersFactory {
  public:
   TemporalLayersFactory() : listener_(nullptr) {}
   virtual ~TemporalLayersFactory() {}
   virtual TemporalLayers* Create(int simulcast_id,
@@ skipping 19 matching lines @@
  public:
   TemporalLayersListener() {}
   virtual ~TemporalLayersListener() {}
 
   virtual void OnTemporalLayersCreated(int simulcast_id,
                                        TemporalLayers* layers) = 0;
 };
 
 }  // namespace webrtc
 #endif  // WEBRTC_MODULES_VIDEO_CODING_CODECS_VP8_TEMPORAL_LAYERS_H_