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      1 // Copyright (c) 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_PEPPER_VIDEO_DECODER_HOST_H_
      6 #define CONTENT_RENDERER_PEPPER_PEPPER_VIDEO_DECODER_HOST_H_
      7 
      8 #include <map>
      9 #include <vector>
     10 
     11 #include "base/basictypes.h"
     12 #include "base/containers/hash_tables.h"
     13 #include "base/memory/scoped_ptr.h"
     14 #include "base/memory/scoped_vector.h"
     15 #include "content/common/content_export.h"
     16 #include "media/video/video_decode_accelerator.h"
     17 #include "ppapi/c/pp_codecs.h"
     18 #include "ppapi/host/host_message_context.h"
     19 #include "ppapi/host/resource_host.h"
     20 #include "ppapi/proxy/resource_message_params.h"
     21 
     22 namespace base {
     23 class SharedMemory;
     24 }
     25 
     26 namespace content {
     27 
     28 class PPB_Graphics3D_Impl;
     29 class RendererPpapiHost;
     30 class RenderViewImpl;
     31 class VideoDecoderShim;
     32 
     33 class CONTENT_EXPORT PepperVideoDecoderHost
     34     : public ppapi::host::ResourceHost,
     35       public media::VideoDecodeAccelerator::Client {
     36  public:
     37   PepperVideoDecoderHost(RendererPpapiHost* host,
     38                          PP_Instance instance,
     39                          PP_Resource resource);
     40   virtual ~PepperVideoDecoderHost();
     41 
     42  private:
     43   struct PendingDecode {
     44     PendingDecode(uint32_t shm_id,
     45                   const ppapi::host::ReplyMessageContext& reply_context);
     46     ~PendingDecode();
     47 
     48     const uint32_t shm_id;
     49     const ppapi::host::ReplyMessageContext reply_context;
     50   };
     51 
     52   friend class VideoDecoderShim;
     53 
     54   // ResourceHost implementation.
     55   virtual int32_t OnResourceMessageReceived(
     56       const IPC::Message& msg,
     57       ppapi::host::HostMessageContext* context) OVERRIDE;
     58 
     59   // media::VideoDecodeAccelerator::Client implementation.
     60   virtual void ProvidePictureBuffers(uint32 requested_num_of_buffers,
     61                                      const gfx::Size& dimensions,
     62                                      uint32 texture_target) OVERRIDE;
     63   virtual void DismissPictureBuffer(int32 picture_buffer_id) OVERRIDE;
     64   virtual void PictureReady(const media::Picture& picture) OVERRIDE;
     65   virtual void NotifyEndOfBitstreamBuffer(int32 bitstream_buffer_id) OVERRIDE;
     66   virtual void NotifyFlushDone() OVERRIDE;
     67   virtual void NotifyResetDone() OVERRIDE;
     68   virtual void NotifyError(media::VideoDecodeAccelerator::Error error) OVERRIDE;
     69 
     70   int32_t OnHostMsgInitialize(ppapi::host::HostMessageContext* context,
     71                               const ppapi::HostResource& graphics_context,
     72                               PP_VideoProfile profile,
     73                               PP_HardwareAcceleration acceleration);
     74   int32_t OnHostMsgGetShm(ppapi::host::HostMessageContext* context,
     75                           uint32_t shm_id,
     76                           uint32_t shm_size);
     77   int32_t OnHostMsgDecode(ppapi::host::HostMessageContext* context,
     78                           uint32_t shm_id,
     79                           uint32_t size,
     80                           int32_t decode_id);
     81   int32_t OnHostMsgAssignTextures(ppapi::host::HostMessageContext* context,
     82                                   const PP_Size& size,
     83                                   const std::vector<uint32_t>& texture_ids);
     84   int32_t OnHostMsgRecyclePicture(ppapi::host::HostMessageContext* context,
     85                                   uint32_t picture_id);
     86   int32_t OnHostMsgFlush(ppapi::host::HostMessageContext* context);
     87   int32_t OnHostMsgReset(ppapi::host::HostMessageContext* context);
     88 
     89   // These methods are needed by VideoDecodeShim, to look like a
     90   // VideoDecodeAccelerator.
     91   void OnInitializeComplete(int32_t result);
     92   const uint8_t* DecodeIdToAddress(uint32_t decode_id);
     93   void RequestTextures(uint32 requested_num_of_buffers,
     94                        const gfx::Size& dimensions,
     95                        uint32 texture_target,
     96                        const std::vector<gpu::Mailbox>& mailboxes);
     97 
     98   // Non-owning pointer.
     99   RendererPpapiHost* renderer_ppapi_host_;
    100 
    101   scoped_ptr<media::VideoDecodeAccelerator> decoder_;
    102 
    103   // A vector holding our shm buffers, in sync with a similar vector in the
    104   // resource. We use a buffer's index in these vectors as its id on both sides
    105   // of the proxy. Only add buffers or update them in place so as not to
    106   // invalidate these ids.
    107   ScopedVector<base::SharedMemory> shm_buffers_;
    108   // A vector of true/false indicating if a shm buffer is in use by the decoder.
    109   // This is parallel to |shm_buffers_|.
    110   std::vector<uint8_t> shm_buffer_busy_;
    111 
    112   // Maps decode uid to PendingDecode info.
    113   typedef base::hash_map<int32_t, PendingDecode> PendingDecodeMap;
    114   PendingDecodeMap pending_decodes_;
    115 
    116   ppapi::host::ReplyMessageContext flush_reply_context_;
    117   ppapi::host::ReplyMessageContext reset_reply_context_;
    118   // Only used when in software fallback mode.
    119   ppapi::host::ReplyMessageContext initialize_reply_context_;
    120 
    121   bool initialized_;
    122 
    123   DISALLOW_COPY_AND_ASSIGN(PepperVideoDecoderHost);
    124 };
    125 
    126 }  // namespace content
    127 
    128 #endif  // CONTENT_RENDERER_PEPPER_PEPPER_VIDEO_DECODER_HOST_H_
    129