content/renderer/pepper/pepper_media_stream_track_host_base.h

   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_PEPPER_MEDIA_STREAM_TRACK_HOST_BASE_H_
   6 #define CONTENT_RENDERER_PEPPER_PEPPER_MEDIA_STREAM_TRACK_HOST_BASE_H_
   7
   8 #include "base/compiler_specific.h"
   9 #include "content/common/content_export.h"
  10 #include "ppapi/host/resource_host.h"
  11 #include "ppapi/shared_impl/media_stream_buffer_manager.h"
  12
  13 namespace content {
  14
  15 class RendererPpapiHost;
  16
  17 class PepperMediaStreamTrackHostBase
  18     : public ppapi::host::ResourceHost,
  19       public ppapi::MediaStreamBufferManager::Delegate {
  20  protected:
  21   PepperMediaStreamTrackHostBase(RendererPpapiHost* host,
  22                                  PP_Instance instance,
  23                                  PP_Resource resource);
  24   ~PepperMediaStreamTrackHostBase() override;
  25
  26   enum TrackType {
  27     kRead,
  28     kWrite
  29   };
  30   bool InitBuffers(int32_t number_of_buffers,
  31                    int32_t buffer_size,
  32                    TrackType track_type);
  33
  34   ppapi::MediaStreamBufferManager* buffer_manager() { return &buffer_manager_; }
  35
  36   // Sends a buffer index to the corresponding MediaStreamTrackResourceBase
  37   // via an IPC message. The resource adds the buffer index into its
  38   // |buffer_manager_| for reading or writing.
  39   // Also see |MediaStreamBufferManager|.
  40   void SendEnqueueBufferMessageToPlugin(int32_t index);
  41
  42   // Sends a set of buffer indices to the corresponding
  43   // MediaStreamTrackResourceBase via an IPC message.
  44   // The resource adds the buffer indices into its
  45   // |frame_buffer_| for reading or writing. Also see |MediaStreamFrameBuffer|.
  46   void SendEnqueueBuffersMessageToPlugin(const std::vector<int32_t>& indices);
  47
  48   // ResourceMessageHandler overrides:
  49   int32_t OnResourceMessageReceived(
  50       const IPC::Message& msg,
  51       ppapi::host::HostMessageContext* context) override;
  52
  53   // Message handlers:
  54   virtual int32_t OnHostMsgEnqueueBuffer(
  55       ppapi::host::HostMessageContext* context, int32_t index);
  56
  57  private:
  58   // Subclasses must implement this method to clean up when the track is closed.
  59   virtual void OnClose() = 0;
  60
  61   // Message handlers:
  62   int32_t OnHostMsgClose(ppapi::host::HostMessageContext* context);
  63
  64   RendererPpapiHost* host_;
  65
  66   ppapi::MediaStreamBufferManager buffer_manager_;
  67
  68   DISALLOW_COPY_AND_ASSIGN(PepperMediaStreamTrackHostBase);
  69 };
  70
  71 }  // namespace content
  72
  73 #endif  // CONTENT_RENDERER_PEPPER_PEPPER_MEDIA_STREAM_TRACK_HOST_BASE_H_