Add accelerated video decoder interface, VP8 and H.264 implementations and hook up to V4L2SVDA.

content/common/gpu/media/vp8_decoder.h

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CONTENT_COMMON_GPU_MEDIA_VP8_DECODER_H_
+#define CONTENT_COMMON_GPU_MEDIA_VP8_DECODER_H_
+
+#include "content/common/gpu/media/accelerated_video_decoder.h"
+#include "content/common/gpu/media/vp8_picture.h"
+#include "media/filters/vp8_parser.h"
+
+namespace content {
+
+// Clients of this class are expected to pass raw VP8 stream and are expected
+// to provide an implementation of VP8Accelerator for offloading final steps
+// of the decoding process.
+//
+// This class must be created, called and destroyed on a single thread, and
+// does nothing internally on any other thread.
+class CONTENT_EXPORT VP8Decoder : public AcceleratedVideoDecoder {
+ public:
+  class VP8Accelerator {
+   public:
+    VP8Accelerator() {}
+    virtual ~VP8Accelerator() {}
+
+    virtual scoped_refptr<VP8Picture> CreateVP8Picture() = 0;
+
+    virtual bool SubmitDecode(const scoped_refptr<VP8Picture>& pic,
+                              const media::VP8FrameHeader* frame_hdr,
+                              const scoped_refptr<VP8Picture>& last_frame,
+                              const scoped_refptr<VP8Picture>& golden_frame,
+                              const scoped_refptr<VP8Picture>& alt_frame) = 0;
+
+    virtual bool OutputPicture(const scoped_refptr<VP8Picture>& pic) = 0;
+
+    DISALLOW_COPY_AND_ASSIGN(VP8Accelerator);
+  };
+
+  VP8Decoder(VP8Accelerator* accelerator);
+  virtual ~VP8Decoder();
+
+  // content::AcceleratedVideoDecoder implementation.
+  bool Flush() override WARN_UNUSED_RESULT;
+  void Reset() override;
+  void SetStream(const uint8* ptr, size_t size) override;
+  DecResult Decode() override WARN_UNUSED_RESULT;
+  gfx::Size GetPicSize() override { return pic_size_; }
+  size_t GetRequiredNumOfPictures() override;
+
+ private:
+  bool DecodeAndOutputCurrentFrame();
+  void BeginFrame();
+  void RefreshReferenceFrames();
+
+  enum State {
+    kNeedStreamMetadata,  // After initialization, need a keyframe.
+    kDecoding,            // Ready to decode from any point.
+    kAfterReset,          // After Reset(), need a resume point.
+    kError,               // Error in decode, can't continue.
+  };
+
+  State state_;
+
+  media::VP8Parser parser_;
+
+  scoped_ptr<media::VP8FrameHeader> curr_frame_hdr_;
+  scoped_refptr<VP8Picture> curr_pic_;
+  scoped_refptr<VP8Picture> last_frame_;
+  scoped_refptr<VP8Picture> golden_frame_;
+  scoped_refptr<VP8Picture> alt_frame_;
+
+  const uint8_t* curr_frame_start_;
+  size_t frame_size_;
+
+  gfx::Size pic_size_;
+  int horizontal_scale_;
+  int vertical_scale_;
+
+  VP8Accelerator* accelerator_;
+};
+
+}  // namespace content
+
+#endif  // CONTENT_COMMON_GPU_MEDIA_VP8_DECODER_H_