Refactor video capture to new design

ppapi/proxy/video_capture_resource.cc

+// 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.
+
+#include "ppapi/proxy/video_capture_resource.h"
+
+#include "ppapi/c/dev/ppp_video_capture_dev.h"
+#include "ppapi/proxy/dispatch_reply_message.h"
+#include "ppapi/proxy/plugin_dispatcher.h"
+#include "ppapi/proxy/ppapi_messages.h"
+#include "ppapi/proxy/ppb_buffer_proxy.h"
+#include "ppapi/proxy/resource_message_params.h"
+#include "ppapi/shared_impl/tracked_callback.h"
+
+namespace ppapi {
+namespace proxy {
+
+VideoCaptureResource::VideoCaptureResource(
+    Connection connection,
+    PP_Instance instance,
+    PluginDispatcher* dispatcher)
+    : PluginResource(connection, instance),
+      devices_(NULL),
+      open_state_(BEFORE_OPEN) {
+  if (!sent_create_to_renderer())
+    SendCreate(RENDERER, PpapiHostMsg_VideoCapture_Create());
+
+  ppp_video_capture_impl_ = static_cast<const PPP_VideoCapture_Dev*>(
+      dispatcher->local_get_interface()(PPP_VIDEO_CAPTURE_DEV_INTERFACE));
+}
+
+VideoCaptureResource::~VideoCaptureResource() {
+}
+
+void VideoCaptureResource::OnReplyReceived(
+    const ResourceMessageReplyParams& params,
+    const IPC::Message& msg) {
+  if (params.sequence()) {
+    PluginResource::OnReplyReceived(params, msg);
+    return;
+  }
+
+  IPC_BEGIN_MESSAGE_MAP(VideoCaptureResource, msg)
+    PPAPI_DISPATCH_PLUGIN_RESOURCE_CALL(
+        PpapiPluginMsg_VideoCapture_OnDeviceInfo,
+        OnDeviceInfo)
+    PPAPI_DISPATCH_PLUGIN_RESOURCE_CALL(
+        PpapiPluginMsg_VideoCapture_OnStatus,
+        OnStatus)
+    PPAPI_DISPATCH_PLUGIN_RESOURCE_CALL(
+        PpapiPluginMsg_VideoCapture_OnError,
+        OnError)
+    PPAPI_DISPATCH_PLUGIN_RESOURCE_CALL(
+        PpapiPluginMsg_VideoCapture_OnBufferReady,
+        OnBufferReady)
+    PPAPI_DISPATCH_PLUGIN_RESOURCE_CALL_UNHANDLED(NOTREACHED())
+  IPC_END_MESSAGE_MAP()
+}
+
+int32_t VideoCaptureResource::EnumerateDevices(
+    PP_Resource* devices,
+    scoped_refptr<TrackedCallback> callback) {
+  if (TrackedCallback::IsPending(enumerate_devices_callback_))
+    return PP_ERROR_INPROGRESS;
+
+  devices_ = devices;
+  enumerate_devices_callback_ = callback;
+
+  Call<PpapiPluginMsg_VideoCapture_EnumerateDevicesReply>(
+      RENDERER,
+      PpapiHostMsg_VideoCapture_EnumerateDevices(),
+      base::Bind(&VideoCaptureResource::OnEnumerateDevicesComplete, this));

[brettw, 2012/10/31 23:50:26]

Cool thing you can do here: Set "devices" and the callback as a bound parameter
to your function here and then you can delete your class member. See
printing_resource.cc for an example. Then you can have a bool for whether the
call is pending which I think is a little more clear than tracking the callback
pending state.

[victorhsieh, 2012/11/02 04:28:47]

Done.  Thanks for the hint.  But I didn't apply this to Open since we still need
to hold a callback reference, so that Close can cancel it.

+  return PP_OK_COMPLETIONPENDING;
+}
+
+int32_t VideoCaptureResource::Open(
+    const std::string& device_id,
+    const PP_VideoCaptureDeviceInfo_Dev& requested_info,
+    uint32_t buffer_count,
+    scoped_refptr<TrackedCallback> callback) {
+  if (open_state_ != BEFORE_OPEN)
+    return PP_ERROR_FAILED;
+
+  if (TrackedCallback::IsPending(open_callback_))
+    return PP_ERROR_INPROGRESS;
+
+  open_callback_ = callback;
+
+  Call<PpapiPluginMsg_VideoCapture_OpenReply>(
+      RENDERER,
+      PpapiHostMsg_VideoCapture_Open(device_id, requested_info, buffer_count),
+      base::Bind(&VideoCaptureResource::OnOpenComplete, this));
+  return PP_OK_COMPLETIONPENDING;
+}
+
+int32_t VideoCaptureResource::StartCapture() {
+  if (open_state_ != OPENED)
+    return PP_ERROR_FAILED;
+
+  buffer_in_use_.clear();
+  Post(RENDERER, PpapiHostMsg_VideoCapture_StartCapture());
+  return PP_OK;
+}
+
+int32_t VideoCaptureResource::ReuseBuffer(uint32_t buffer) {
+  if (buffer >= buffer_in_use_.size() || !buffer_in_use_[buffer])
+    return PP_ERROR_BADARGUMENT;
+  Post(RENDERER, PpapiHostMsg_VideoCapture_ReuseBuffer(buffer));
+  return PP_OK;
+}
+
+int32_t VideoCaptureResource::StopCapture() {
+  if (open_state_ != OPENED)
+    return PP_ERROR_FAILED;
+
+  Post(RENDERER, PpapiHostMsg_VideoCapture_StopCapture());
+  return PP_OK;
+}
+
+void VideoCaptureResource::Close() {
+  Post(RENDERER, PpapiHostMsg_VideoCapture_Close());
+
+  open_state_ = CLOSED;
+
+  if (TrackedCallback::IsPending(open_callback_))
+    open_callback_->PostAbort();
+}
+
+void VideoCaptureResource::OnDeviceInfo(
+    const ResourceMessageReplyParams& params,
+    const struct PP_VideoCaptureDeviceInfo_Dev& info,
+    const std::vector<HostResource>& buffers,
+    uint32_t buffer_size) {
+  if (!ppp_video_capture_impl_)
+    return;
+
+  std::vector<base::SharedMemoryHandle> handles;
+  params.GetAllSharedMemoryHandles(&handles);
+  DCHECK(handles.size() == buffers.size());
+
+  scoped_array<PP_Resource> resources(new PP_Resource[buffers.size()]);
+  for (size_t i = 0; i < buffers.size(); ++i) {
+    resources[i] = ppapi::proxy::PPB_Buffer_Proxy::AddProxyResource(
+        buffers[i], handles[i], buffer_size);
+  }
+
+  buffer_in_use_ = std::vector<bool>(buffers.size());
+
+  ppp_video_capture_impl_->OnDeviceInfo(
+      pp_instance(),
+      pp_resource(),
+      &info,
+      buffers.size(),
+      resources.get());
+}
+
+void VideoCaptureResource::OnStatus(
+    const ResourceMessageReplyParams& params,
+    uint32_t status) {
+  if (ppp_video_capture_impl_)
+    ppp_video_capture_impl_->OnStatus(pp_instance(), pp_resource(), status);
+}
+
+void VideoCaptureResource::OnError(
+    const ResourceMessageReplyParams& params,
+    uint32_t error_code) {
+  if (ppp_video_capture_impl_)
+    ppp_video_capture_impl_->OnError(pp_instance(), pp_resource(), error_code);
+}
+
+void VideoCaptureResource::OnBufferReady(
+    const ResourceMessageReplyParams& params,
+    uint32_t buffer) {
+  SetBufferInUse(buffer);
+  if (ppp_video_capture_impl_) {
+    ppp_video_capture_impl_->OnBufferReady(pp_instance(), pp_resource(),
+                                           buffer);
+  }
+}
+
+void VideoCaptureResource::OnOpenComplete(
+    const ResourceMessageReplyParams& params) {
+  if (open_state_ == BEFORE_OPEN && params.result() == PP_OK)
+    open_state_ = OPENED;
+
+  // The callback may have been aborted by Close(), or the open operation is
+  // completed synchronously.
+  if (TrackedCallback::IsPending(open_callback_))
+    TrackedCallback::ClearAndRun(&open_callback_, params.result());
+}
+
+void VideoCaptureResource::OnEnumerateDevicesComplete(
+    const ResourceMessageReplyParams& params,
+    const std::vector<DeviceRefData>& devices) {
+  DCHECK(TrackedCallback::IsPending(enumerate_devices_callback_));
+
+  if (params.result() == PP_OK && devices_) {
+    devices_data_ = devices;
+
+    // devices_ points to the resource array of PP_ArrayOutput allocated in
+    // VideoCapture_Dev.
+    *devices_ = PPB_DeviceRef_Shared::CreateResourceArray(
+        OBJECT_IS_PROXY, pp_instance(), devices);
+  }
+  devices_ = NULL;
+
+  TrackedCallback::ClearAndRun(&enumerate_devices_callback_, params.result());
+}
+
+void VideoCaptureResource::SetBufferInUse(uint32_t buffer_index) {
+  DCHECK(buffer_index < buffer_in_use_.size());
+  buffer_in_use_[buffer_index] = true;
+}
+
+}  // namespace proxy
+}  // namespace ppapi