Revert 137988 - VAVDA is the hardware video decode accelerator for Chrome on Linux and ChromeOS for…

content/common/gpu/media/h264_dpb.h

-// Copyright (c) 2012 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.
-//
-// This file contains an implementation of an H.264 Decoded Picture Buffer
-// used in H264 decoders.
-
-#ifndef CONTENT_COMMON_GPU_MEDIA_H264_DPB_H_
-#define CONTENT_COMMON_GPU_MEDIA_H264_DPB_H_
-
-#include <vector>
-
-#include "base/basictypes.h"
-#include "base/memory/scoped_vector.h"
-#include "content/common/gpu/media/h264_parser.h"
-
-namespace content {
-
-// A picture (a frame or a field) in the H.264 spec sense.
-// See spec at http://www.itu.int/rec/T-REC-H.264
-struct H264Picture {
-  enum Field {
-    FIELD_NONE,
-    FIELD_TOP,
-    FIELD_BOTTOM,
-  };
-
-  // Values calculated per H.264 specification or taken from slice header.
-  // See spec for more details on each (some names have been converted from
-  // CamelCase in spec to Chromium-style names).
-  int top_field_order_cnt;
-  int bottom_field_order_cnt;
-  int pic_order_cnt;
-  int pic_order_cnt_msb;
-  int pic_order_cnt_lsb;
-
-  int pic_num;
-  int long_term_pic_num;
-  int frame_num;  // from slice header
-  int frame_num_wrap;
-  int long_term_frame_idx;
-
-  bool idr;  // IDR picture?
-  bool ref;  // reference picture?
-  bool long_term;  // long term reference picture?
-  bool outputted;
-  // Does memory management op 5 needs to be executed after this
-  // picture has finished decoding?
-  bool mem_mgmt_5;
-
-  Field field;
-
-  // Values from slice_hdr to be used during reference marking and
-  // memory management after finishing this picture.
-  bool long_term_reference_flag;
-  bool adaptive_ref_pic_marking_mode_flag;
-  H264DecRefPicMarking ref_pic_marking[H264SliceHeader::kRefListSize];
-
-  typedef std::vector<H264Picture*> PtrVector;
-};
-
-// DPB - Decoded Picture Buffer.
-// Stores decoded pictures that will be used for future display
-// and/or reference.
-class H264DPB {
- public:
-  H264DPB();
-  ~H264DPB();
-
-  // Remove unused (not reference and already outputted) pictures from DPB.
-  void RemoveUnused();
-
-  // Remove a picture by its pic_order_cnt.
-  void RemoveByPOC(int poc);
-
-  // Clear DPB.
-  void Clear();
-
-  // Store picture in DPB. DPB takes ownership of its resources.
-  void StorePic(H264Picture* pic);
-
-  // Return the number of reference pictures in DPB.
-  int CountRefPics();
-
-  // Mark all pictures in DPB as unused for reference.
-  void MarkAllUnusedForRef();
-
-  // Return a short-term reference picture by its pic_num.
-  H264Picture* GetShortRefPicByPicNum(int pic_num);
-
-  // Return a long-term reference picture by its long_term_pic_num.
-  H264Picture* GetLongRefPicByLongTermPicNum(int pic_num);
-
-  // Return the short reference picture with lowest frame_num. Used for sliding
-  // window memory management.
-  H264Picture* GetLowestFrameNumWrapShortRefPic();
-
-  // Append all pictures that have not been outputted yet to the passed |out|
-  // vector, sorted by lowest pic_order_cnt (in output order).
-  void GetNotOutputtedPicsAppending(H264Picture::PtrVector& out);
-
-  // Append all short term reference pictures to the passed |out| vector.
-  void GetShortTermRefPicsAppending(H264Picture::PtrVector& out);
-
-  // Append all long term reference pictures to the passed |out| vector.
-  void GetLongTermRefPicsAppending(H264Picture::PtrVector& out);
-
-  // Iterators for direct access to DPB contents.
-  // Will be invalidated after any of Remove* calls.
-  typedef ScopedVector<H264Picture> Pictures;
-  Pictures::iterator begin() { return pics_.begin(); }
-  Pictures::iterator end() { return pics_.end(); }
-  Pictures::reverse_iterator rbegin() { return pics_.rbegin(); }
-  Pictures::reverse_iterator rend() { return pics_.rend(); }
-
-  size_t size() const { return pics_.size(); }
-  bool IsFull() const { return pics_.size() == kDPBMaxSize; }
-
-  // Per H264 spec, increase to 32 if interlaced video is supported.
-  enum { kDPBMaxSize = 16 };
-
- private:
-  // Remove a picture from DPB, freeing its resources.
-  void RemovePic(const Pictures::iterator iter);
-
-  Pictures pics_;
-
-  DISALLOW_COPY_AND_ASSIGN(H264DPB);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_COMMON_GPU_MEDIA_H264_DPB_H_
-