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      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 
     22 namespace base {
     23 class SingleThreadTaskRunner;
     24 }
     25 
     26 namespace gpu {
     27 namespace gles2 {
     28 class GLES2Interface;
     29 }
     30 }
     31 
     32 namespace media {
     33 class DecoderBuffer;
     34 }
     35 
     36 namespace webkit {
     37 namespace gpu {
     38 class ContextProviderWebContext;
     39 }
     40 }
     41 
     42 namespace content {
     43 
     44 class 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.
     50 class 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