src/ppapi/proxy/video_decoder_resource.h

   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 PPAPI_PROXY_VIDEO_DECODER_RESOURCE_H_
   6 #define PPAPI_PROXY_VIDEO_DECODER_RESOURCE_H_
   7
   8 #include <queue>
   9
  10 #include "base/containers/hash_tables.h"
  11 #include "base/memory/ref_counted.h"
  12 #include "base/memory/scoped_ptr.h"
  13 #include "base/memory/scoped_vector.h"
  14 #include "ppapi/proxy/connection.h"
  15 #include "ppapi/proxy/plugin_resource.h"
  16 #include "ppapi/proxy/ppapi_proxy_export.h"
  17 #include "ppapi/shared_impl/resource.h"
  18 #include "ppapi/shared_impl/scoped_pp_resource.h"
  19 #include "ppapi/thunk/ppb_video_decoder_api.h"
  20
  21 namespace gpu {
  22 struct Mailbox;
  23 namespace gles2 {
  24 class GLES2Implementation;
  25 }
  26 }
  27
  28 namespace ppapi {
  29
  30 class PPB_Graphics3D_Shared;
  31 class TrackedCallback;
  32
  33 namespace proxy {
  34
  35 class PPAPI_PROXY_EXPORT VideoDecoderResource
  36     : public PluginResource,
  37       public thunk::PPB_VideoDecoder_API {
  38  public:
  39   VideoDecoderResource(Connection connection, PP_Instance instance);
  40   virtual ~VideoDecoderResource();
  41
  42   // Resource overrides.
  43   virtual thunk::PPB_VideoDecoder_API* AsPPB_VideoDecoder_API() override;
  44
  45   // PPB_VideoDecoder_API implementation.
  46   virtual int32_t Initialize0_1(
  47       PP_Resource graphics_context,
  48       PP_VideoProfile profile,
  49       PP_Bool allow_software_fallback,
  50       scoped_refptr<TrackedCallback> callback) override;
  51   virtual int32_t Initialize(PP_Resource graphics_context,
  52                              PP_VideoProfile profile,
  53                              PP_HardwareAcceleration acceleration,
  54                              scoped_refptr<TrackedCallback> callback) override;
  55   virtual int32_t Decode(uint32_t decode_id,
  56                          uint32_t size,
  57                          const void* buffer,
  58                          scoped_refptr<TrackedCallback> callback) override;
  59   virtual int32_t GetPicture0_1(
  60       PP_VideoPicture_0_1* picture,
  61       scoped_refptr<TrackedCallback> callback) override;
  62   virtual int32_t GetPicture(PP_VideoPicture* picture,
  63                              scoped_refptr<TrackedCallback> callback) override;
  64   virtual void RecyclePicture(const PP_VideoPicture* picture) override;
  65   virtual int32_t Flush(scoped_refptr<TrackedCallback> callback) override;
  66   virtual int32_t Reset(scoped_refptr<TrackedCallback> callback) override;
  67
  68   // PluginResource implementation.
  69   virtual void OnReplyReceived(const ResourceMessageReplyParams& params,
  70                                const IPC::Message& msg) override;
  71
  72   // Called only by unit tests. This bypasses Graphics3D setup, which doesn't
  73   // work in ppapi::proxy::PluginProxyTest.
  74   void SetForTest();
  75
  76  private:
  77   // Struct to hold a shared memory buffer.
  78   struct ShmBuffer {
  79     ShmBuffer(scoped_ptr<base::SharedMemory> shm,
  80               uint32_t size,
  81               uint32_t shm_id);
  82     ~ShmBuffer();
  83
  84     const scoped_ptr<base::SharedMemory> shm;
  85     void* addr;
  86     // Index into shm_buffers_ vector, used as an id. This should map 1:1 to
  87     // the index on the host side of the proxy.
  88     const uint32_t shm_id;
  89   };
  90
  91   // Struct to hold texture information.
  92   struct Texture {
  93     Texture(uint32_t texture_target, const PP_Size& size);
  94     ~Texture();
  95
  96     const uint32_t texture_target;
  97     const PP_Size size;
  98   };
  99
 100   // Struct to hold a picture received from the decoder.
 101   struct Picture {
 102     Picture(int32_t decode_id,
 103             uint32_t texture_id,
 104             const PP_Rect& visible_rect);
 105     ~Picture();
 106
 107     int32_t decode_id;
 108     uint32_t texture_id;
 109     PP_Rect visible_rect;
 110   };
 111
 112   // Unsolicited reply message handlers.
 113   void OnPluginMsgRequestTextures(const ResourceMessageReplyParams& params,
 114                                   uint32_t num_textures,
 115                                   const PP_Size& size,
 116                                   uint32_t texture_target,
 117                                   const std::vector<gpu::Mailbox>& mailboxes);
 118   void OnPluginMsgPictureReady(const ResourceMessageReplyParams& params,
 119                                int32_t decode_id,
 120                                uint32_t texture_id,
 121                                const PP_Rect& visible_rect);
 122   void OnPluginMsgDismissPicture(const ResourceMessageReplyParams& params,
 123                                  uint32_t texture_id);
 124   void OnPluginMsgNotifyError(const ResourceMessageReplyParams& params,
 125                               int32_t error);
 126
 127   // Reply message handlers for operations that are done in the host.
 128   void OnPluginMsgInitializeComplete(const ResourceMessageReplyParams& params);
 129   void OnPluginMsgDecodeComplete(const ResourceMessageReplyParams& params,
 130                                  uint32_t shm_id);
 131   void OnPluginMsgFlushComplete(const ResourceMessageReplyParams& params);
 132   void OnPluginMsgResetComplete(const ResourceMessageReplyParams& params);
 133
 134   void RunCallbackWithError(scoped_refptr<TrackedCallback>* callback);
 135   void DeleteGLTexture(uint32_t texture_id);
 136   void WriteNextPicture();
 137
 138   // ScopedVector to own the shared memory buffers.
 139   ScopedVector<ShmBuffer> shm_buffers_;
 140
 141   // List of available shared memory buffers.
 142   typedef std::vector<ShmBuffer*> ShmBufferList;
 143   ShmBufferList available_shm_buffers_;
 144
 145   // Map of GL texture id to texture info.
 146   typedef base::hash_map<uint32_t, Texture> TextureMap;
 147   TextureMap textures_;
 148
 149   // Queue of received pictures.
 150   typedef std::queue<Picture> PictureQueue;
 151   PictureQueue received_pictures_;
 152
 153   // Pending callbacks.
 154   scoped_refptr<TrackedCallback> initialize_callback_;
 155   scoped_refptr<TrackedCallback> decode_callback_;
 156   scoped_refptr<TrackedCallback> get_picture_callback_;
 157   scoped_refptr<TrackedCallback> flush_callback_;
 158   scoped_refptr<TrackedCallback> reset_callback_;
 159
 160   // Number of Decode calls made, mod 2^31, to serve as a uid for each decode.
 161   int32_t num_decodes_;
 162   // The maximum delay (in Decode calls) before we receive a picture. If we
 163   // haven't received a picture from a Decode call after this many successive
 164   // calls to Decode, then we will never receive a picture from the call.
 165   // Note that this isn't guaranteed by H264 or other codecs. In practice, this
 166   // number is less than 16. Make it much larger just to be safe.
 167   // NOTE: because we count decodes mod 2^31, this value must be a power of 2.
 168   static const int kMaximumPictureDelay = 128;
 169   uint32_t decode_ids_[kMaximumPictureDelay];
 170
 171   // State for pending get_picture_callback_.
 172   PP_VideoPicture* get_picture_;
 173   PP_VideoPicture_0_1* get_picture_0_1_;
 174
 175   ScopedPPResource graphics3d_;
 176   gpu::gles2::GLES2Implementation* gles2_impl_;
 177
 178   bool initialized_;
 179   bool testing_;
 180   int32_t decoder_last_error_;
 181
 182   DISALLOW_COPY_AND_ASSIGN(VideoDecoderResource);
 183 };
 184
 185 }  // namespace proxy
 186 }  // namespace ppapi
 187
 188 #endif  // PPAPI_PROXY_VIDEO_DECODER_RESOURCE_H_