Implement device enumeration for PPB_VideoCapture_Dev.

ppapi/shared_impl/ppb_video_capture_shared.h

+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef PPAPI_SHARED_IMPL_PPB_VIDEO_CAPTURE_SHARED_H_
+#define PPAPI_SHARED_IMPL_PPB_VIDEO_CAPTURE_SHARED_H_
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "base/memory/ref_counted.h"
+#include "ppapi/shared_impl/ppapi_shared_export.h"
+#include "ppapi/shared_impl/resource.h"
+#include "ppapi/shared_impl/tracked_callback.h"
+#include "ppapi/thunk/ppb_video_capture_api.h"
+
+namespace ppapi {
+
+class PPAPI_SHARED_EXPORT PPB_VideoCapture_Shared
+    : public Resource,
+      NON_EXPORTED_BASE(public thunk::PPB_VideoCapture_API) {
+ public:
+  explicit PPB_VideoCapture_Shared(PP_Instance instance);
+  explicit PPB_VideoCapture_Shared(const HostResource& host_resource);
+  virtual ~PPB_VideoCapture_Shared();
+
+  // Resource overrides.
+  virtual thunk::PPB_VideoCapture_API* AsPPB_VideoCapture_API() OVERRIDE;
+
+  // PPB_VideoCapture_API implementation.
+  virtual int32_t EnumerateDevices(PP_Resource* devices,
+                                   PP_CompletionCallback callback) OVERRIDE;
+  virtual int32_t Open(const std::string& device_id,
+                       const PP_VideoCaptureDeviceInfo_Dev& requested_info,
+                       uint32_t buffer_count,
+                       PP_CompletionCallback callback) OVERRIDE;
+  virtual int32_t StartCapture() OVERRIDE;
+  virtual int32_t ReuseBuffer(uint32_t buffer) OVERRIDE;
+  virtual int32_t StopCapture() OVERRIDE;
+  virtual void Close() OVERRIDE;
+  virtual int32_t StartCapture0_1(
+      const PP_VideoCaptureDeviceInfo_Dev& requested_info,
+      uint32_t buffer_count) OVERRIDE;
+  virtual const std::vector<DeviceRefData>& GetDeviceRefData() const OVERRIDE;
+
+  void OnEnumerateDevicesComplete(int32_t result,
+                                  const std::vector<DeviceRefData>& devices);
+  void OnOpenComplete(int32_t result);
+
+ protected:
+  enum OpenState {
+    BEFORE_OPEN,
+    OPENED,
+    CLOSED
+  };
+
+  // Subclasses should implement these methods to do impl- and proxy-specific
+  // work.
+  virtual int32_t InternalEnumerateDevices(PP_Resource* devices,
+                                           PP_CompletionCallback callback) = 0;
+  virtual int32_t InternalOpen(
+      const std::string& device_id,
+      const PP_VideoCaptureDeviceInfo_Dev& requested_info,
+      uint32_t buffer_count,
+      PP_CompletionCallback callback) = 0;
+  virtual int32_t InternalStartCapture() = 0;
+  virtual int32_t InternalReuseBuffer(uint32_t buffer) = 0;
+  virtual int32_t InternalStopCapture() = 0;
+  virtual void InternalClose() = 0;
+  virtual int32_t InternalStartCapture0_1(
+      const PP_VideoCaptureDeviceInfo_Dev& requested_info,
+      uint32_t buffer_count) = 0;
+  virtual const std::vector<DeviceRefData>& InternalGetDeviceRefData(
+      ) const = 0;
+
+  // Checks whether |status| is expected and sets |status_| if yes. If |forced|
+  // is set to true, this method will bypass sanity check and always set
+  // |status_|.
+  bool SetStatus(PP_VideoCaptureStatus_Dev status, bool forced);
+
+  OpenState open_state_;
+  PP_VideoCaptureStatus_Dev status_;
+
+  scoped_refptr<TrackedCallback> enumerate_devices_callback_;
+  scoped_refptr<TrackedCallback> open_callback_;
+
+  // Output parameter of EnumerateDevices(). It should not be accessed after
+  // |enumerate_devices_callback_| is run.
+  PP_Resource* devices_;
+
+  ResourceObjectType resource_object_type_;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(PPB_VideoCapture_Shared);
+};
+
+}  // namespace ppapi
+
+#endif  // PPAPI_SHARED_IMPL_PPB_VIDEO_CAPTURE_SHARED_H_