1// Copyright 2014 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#ifndef CONTENT_RENDERER_PEPPER_VIDEO_DECODER_SHIM_H_
6#define CONTENT_RENDERER_PEPPER_VIDEO_DECODER_SHIM_H_
7
8#include <queue>
9#include <vector>
10
11#include "base/basictypes.h"
12#include "base/containers/hash_tables.h"
13#include "base/memory/linked_ptr.h"
14#include "base/memory/scoped_ptr.h"
15#include "base/memory/weak_ptr.h"
16#include "gpu/command_buffer/common/mailbox.h"
17#include "media/base/video_decoder_config.h"
18#include "media/video/video_decode_accelerator.h"
19
20#include "ppapi/c/pp_codecs.h"
21
22namespace base {
23class SingleThreadTaskRunner;
24}
25
26namespace gpu {
27namespace gles2 {
28class GLES2Interface;
29}
30}
31
32namespace media {
33class DecoderBuffer;
34}
35
36namespace webkit {
37namespace gpu {
38class ContextProviderWebContext;
39}
40}
41
42namespace content {
43
44class PepperVideoDecoderHost;
45
46// This class is a shim to wrap a media::VideoDecoder so that it can be used
47// by PepperVideoDecoderHost in place of a media::VideoDecodeAccelerator.
48// This class should be constructed, used, and destructed on the main (render)
49// thread.
50class VideoDecoderShim : public media::VideoDecodeAccelerator {
51 public:
52  explicit VideoDecoderShim(PepperVideoDecoderHost* host);
53  virtual ~VideoDecoderShim();
54
55  // media::VideoDecodeAccelerator implementation.
56  virtual bool Initialize(
57      media::VideoCodecProfile profile,
58      media::VideoDecodeAccelerator::Client* client) OVERRIDE;
59  virtual void Decode(const media::BitstreamBuffer& bitstream_buffer) OVERRIDE;
60  virtual void AssignPictureBuffers(
61      const std::vector<media::PictureBuffer>& buffers) OVERRIDE;
62  virtual void ReusePictureBuffer(int32 picture_buffer_id) OVERRIDE;
63  virtual void Flush() OVERRIDE;
64  virtual void Reset() OVERRIDE;
65  virtual void Destroy() OVERRIDE;
66
67 private:
68  enum State {
69    UNINITIALIZED,
70    DECODING,
71    FLUSHING,
72    RESETTING,
73  };
74
75  struct PendingDecode;
76  struct PendingFrame;
77  class DecoderImpl;
78
79  void OnInitializeComplete(int32_t result, uint32_t texture_pool_size);
80  void OnDecodeComplete(int32_t result, uint32_t decode_id);
81  void OnOutputComplete(scoped_ptr<PendingFrame> frame);
82  void SendPictures();
83  void OnResetComplete();
84  void NotifyCompletedDecodes();
85  void DismissTexture(uint32_t texture_id);
86  void DeleteTexture(uint32_t texture_id);
87  // Call this whenever we change GL state that the plugin relies on, such as
88  // creating picture textures.
89  void FlushCommandBuffer();
90
91  scoped_ptr<DecoderImpl> decoder_impl_;
92  State state_;
93
94  PepperVideoDecoderHost* host_;
95  scoped_refptr<base::SingleThreadTaskRunner> media_task_runner_;
96  scoped_refptr<webkit::gpu::ContextProviderWebContext> context_provider_;
97
98  // The current decoded frame size.
99  gfx::Size texture_size_;
100  // Map that takes the plugin's GL texture id to the renderer's GL texture id.
101  typedef base::hash_map<uint32_t, uint32_t> TextureIdMap;
102  TextureIdMap texture_id_map_;
103  // Available textures (these are plugin ids.)
104  typedef base::hash_set<uint32_t> TextureIdSet;
105  TextureIdSet available_textures_;
106  // Track textures that are no longer needed (these are plugin ids.)
107  TextureIdSet textures_to_dismiss_;
108  // Mailboxes for pending texture requests, to write to plugin's textures.
109  std::vector<gpu::Mailbox> pending_texture_mailboxes_;
110
111  // Queue of completed decode ids, for notifying the host.
112  typedef std::queue<uint32_t> CompletedDecodeQueue;
113  CompletedDecodeQueue completed_decodes_;
114
115  // Queue of decoded frames that have been converted to RGB and await upload to
116  // a GL texture.
117  typedef std::queue<linked_ptr<PendingFrame> > PendingFrameQueue;
118  PendingFrameQueue pending_frames_;
119
120  // The optimal number of textures to allocate for decoder_impl_.
121  uint32_t texture_pool_size_;
122
123  uint32_t num_pending_decodes_;
124
125  base::WeakPtrFactory<VideoDecoderShim> weak_ptr_factory_;
126
127  DISALLOW_COPY_AND_ASSIGN(VideoDecoderShim);
128};
129
130}  // namespace content
131
132#endif  // CONTENT_RENDERER_PEPPER_VIDEO_DECODER_SHIM_H_
133