PPB/PPP_VideoCapture_Dev proxy

ppapi/proxy/ppb_video_capture_proxy.cc

+// Copyright (c) 2011 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/ppb_video_capture_proxy.h"
+
+#include <vector>
+
+#include "base/logging.h"
+#include "build/build_config.h"
+#include "ppapi/c/pp_errors.h"
+#include "ppapi/c/pp_resource.h"
+#include "ppapi/c/ppb_core.h"
+#include "ppapi/c/dev/ppb_video_capture_dev.h"
+#include "ppapi/c/dev/ppp_video_capture_dev.h"
+#include "ppapi/proxy/enter_proxy.h"
+#include "ppapi/proxy/host_dispatcher.h"
+#include "ppapi/proxy/plugin_dispatcher.h"
+#include "ppapi/proxy/plugin_resource.h"
+#include "ppapi/proxy/ppapi_messages.h"
+#include "ppapi/proxy/ppb_buffer_proxy.h"
+#include "ppapi/thunk/ppb_buffer_api.h"
+#include "ppapi/thunk/ppb_buffer_trusted_api.h"
+#include "ppapi/thunk/ppb_video_capture_api.h"
+#include "ppapi/thunk/thunk.h"
+
+using ppapi::thunk::EnterResourceNoLock;
+using ppapi::thunk::PPB_Buffer_API;
+using ppapi::thunk::PPB_BufferTrusted_API;
+using ppapi::thunk::PPB_VideoCapture_API;
+
+namespace pp {
+namespace proxy {
+
+namespace {
+
+InterfaceProxy* CreatePPBVideoCaptureProxy(Dispatcher* dispatcher,
+                                           const void* target_interface) {
+  return new PPB_VideoCapture_Proxy(dispatcher, target_interface);
+}
+
+InterfaceProxy* CreatePPPVideoCaptureProxy(Dispatcher* dispatcher,
+                                           const void* target_interface) {
+  return new PPP_VideoCapture_Proxy(dispatcher, target_interface);
+}
+
+void OnDeviceInfo(PP_Instance instance,
+                  PP_Resource resource,
+                  const struct PP_VideoCaptureDeviceInfo_Dev* info,

[brettw, 2011/08/08 22:42:17]

I don't usually write the "struct" in C++ code.

[piman, 2011/08/09 02:31:39]

Done.

+                  uint32_t buffer_count,
+                  const PP_Resource* resources) {
+  HostDispatcher* dispatcher = HostDispatcher::GetForInstance(instance);
+  if (!dispatcher) {
+    NOTREACHED();
+    return;
+  }
+  HostResource host_resource;
+  host_resource.SetHostResource(instance, resource);
+  std::vector<PPPVideoCapture_Buffer> buffers(buffer_count);
+  const PPB_Core* core = static_cast<const PPB_Core*>(
+      dispatcher->GetLocalInterface(PPB_CORE_INTERFACE));
+  DCHECK(core);
+  for (uint32_t i = 0; i < buffer_count; ++i) {
+    // We need to take a ref on the resource now. The browser may drop
+    // references once we return from here, but we're sending an asynchronous
+    // message. The plugin side takes ownership of that reference.
+    core->AddRefResource(resources[i]);
+    buffers[i].resource.SetHostResource(instance, resources[i]);
+    {
+      EnterResourceNoLock<PPB_Buffer_API> enter(resources[i], true);
+      DCHECK(enter.succeeded());
+      PP_Bool result = enter.object()->Describe(&buffers[i].size);
+      DCHECK(result);
+    }
+    {
+      EnterResourceNoLock<PPB_BufferTrusted_API> enter(resources[i], true);
+      DCHECK(enter.succeeded());
+      int handle;
+      int32_t result = enter.object()->GetSharedMemory(&handle);
+      DCHECK(result == PP_OK);
+      // TODO(piman/brettw): Change trusted interface to return a PP_FileHandle,
+      // those casts are ugly.
+      base::PlatformFile platform_file =
+#if defined(OS_WIN)
+          reinterpret_cast<HANDLE>(static_cast<intptr_t>(handle));
+#elif defined(OS_POSIX)
+          handle;
+#else
+#error Not implemented.
+#endif
+      buffers[i].handle =
+          dispatcher->ShareHandleWithRemote(platform_file, false);
+    }
+  }
+  dispatcher->Send(new PpapiMsg_PPPVideoCapture_OnDeviceInfo(
+      INTERFACE_ID_PPP_VIDEO_CAPTURE_DEV, host_resource, *info, buffers));
+}
+
+void OnStatus(PP_Instance instance, PP_Resource resource, uint32_t status) {
+  HostDispatcher* dispatcher = HostDispatcher::GetForInstance(instance);
+  if (!dispatcher) {
+    NOTREACHED();
+    return;
+  }
+  HostResource host_resource;
+  host_resource.SetHostResource(instance, resource);
+  dispatcher->Send(new PpapiMsg_PPPVideoCapture_OnStatus(
+        INTERFACE_ID_PPP_VIDEO_CAPTURE_DEV, host_resource, status));

[brettw, 2011/08/08 22:42:17]

These lines should be indented 2 spaces less.

[piman, 2011/08/09 02:31:39]

Done.

+}
+
+void OnError(PP_Instance instance, PP_Resource resource, uint32_t error_code) {

[brettw, 2011/08/08 22:42:17]

It seems like maybe these functions shouldn't take an instance. Do you think we
should change this in the interface? (in a separate patch)

[piman, 2011/08/09 02:31:39]

As I mentioned in the other CL, 1- we don't yet have the infrastructure to make
it possible, 2- it's trivial and cheap to pass the instance as a parameter, 3-
this is consistent with other interfaces.

I mildly think it's actually better this way, but I'm not attached to it as long
as we fix 1, and we stay consistent (i.e. someone fixes the other interfaces).

+  HostDispatcher* dispatcher = HostDispatcher::GetForInstance(instance);
+  if (!dispatcher) {
+    NOTREACHED();
+    return;
+  }
+  HostResource host_resource;
+  host_resource.SetHostResource(instance, resource);
+  dispatcher->Send(new PpapiMsg_PPPVideoCapture_OnError(
+        INTERFACE_ID_PPP_VIDEO_CAPTURE_DEV, host_resource, error_code));
+}
+
+void OnBufferReady(PP_Instance instance,
+                   PP_Resource resource,
+                   uint32_t buffer) {
+  HostDispatcher* dispatcher = HostDispatcher::GetForInstance(instance);
+  if (!dispatcher) {
+    NOTREACHED();
+    return;
+  }
+  HostResource host_resource;
+  host_resource.SetHostResource(instance, resource);
+  dispatcher->Send(new PpapiMsg_PPPVideoCapture_OnBufferReady(
+        INTERFACE_ID_PPP_VIDEO_CAPTURE_DEV, host_resource, buffer));
+}
+
+PPP_VideoCapture_Dev ppp_video_capture = {
+  OnDeviceInfo,
+  OnStatus,
+  OnError,
+  OnBufferReady
+};
+
+}  // namespace
+
+class VideoCapture : public ppapi::thunk::PPB_VideoCapture_API,
+                     public PluginResource {
+ public:
+  VideoCapture(const HostResource& resource);
+  virtual ~VideoCapture();
+
+  // Resource overrides.
+  virtual VideoCapture* AsVideoCapture() OVERRIDE;
+
+  // ResourceObjectBase overrides.
+  virtual ppapi::thunk::PPB_VideoCapture_API* AsPPB_VideoCapture_API() OVERRIDE;
+
+  // PPB_VideoCapture_API implementation.
+  virtual int32_t StartCapture(
+      const PP_VideoCaptureDeviceInfo_Dev& requested_info,
+      uint32_t buffer_count) {
+    switch (status_) {
+      case PP_VIDEO_CAPTURE_STATUS_STARTING:
+      case PP_VIDEO_CAPTURE_STATUS_STARTED:
+      case PP_VIDEO_CAPTURE_STATUS_PAUSED:
+      default:
+        return PP_ERROR_FAILED;
+      case PP_VIDEO_CAPTURE_STATUS_STOPPED:
+      case PP_VIDEO_CAPTURE_STATUS_STOPPING:
+        break;
+    }
+    status_ = PP_VIDEO_CAPTURE_STATUS_STARTING;
+    GetDispatcher()->Send(new PpapiHostMsg_PPBVideoCapture_StartCapture(
+        INTERFACE_ID_PPB_VIDEO_CAPTURE_DEV, host_resource(),
+        requested_info, buffer_count));
+    return PP_OK;
+  }
+
+  virtual int32_t ReuseBuffer(uint32_t buffer) {
+    if (buffer >= buffer_in_use_.size() || !buffer_in_use_[buffer])
+      return PP_ERROR_BADARGUMENT;
+    GetDispatcher()->Send(new PpapiHostMsg_PPBVideoCapture_ReuseBuffer(
+        INTERFACE_ID_PPB_VIDEO_CAPTURE_DEV, host_resource(), buffer));
+    return PP_OK;
+  }
+
+  virtual int32_t StopCapture() {
+    switch (status_) {
+      case PP_VIDEO_CAPTURE_STATUS_STOPPED:
+      case PP_VIDEO_CAPTURE_STATUS_STOPPING:
+      default:
+        return PP_ERROR_FAILED;
+      case PP_VIDEO_CAPTURE_STATUS_STARTING:
+      case PP_VIDEO_CAPTURE_STATUS_STARTED:
+      case PP_VIDEO_CAPTURE_STATUS_PAUSED:
+        break;
+    }
+    buffer_in_use_.clear();
+    status_ = PP_VIDEO_CAPTURE_STATUS_STOPPING;
+    GetDispatcher()->Send(new PpapiHostMsg_PPBVideoCapture_StopCapture(
+        INTERFACE_ID_PPB_VIDEO_CAPTURE_DEV, host_resource()));
+    return PP_OK;
+  }
+
+  bool OnStatus(uint32_t status) {
+    switch (status) {
+      case PP_VIDEO_CAPTURE_STATUS_STARTING:
+      case PP_VIDEO_CAPTURE_STATUS_STOPPING:
+      default:
+        // Those states are not sent by the browser.
+        NOTREACHED();
+        return false;
+      case PP_VIDEO_CAPTURE_STATUS_STARTED:
+        switch (status_) {
+          case PP_VIDEO_CAPTURE_STATUS_STARTING:
+          case PP_VIDEO_CAPTURE_STATUS_PAUSED:
+            break;
+          default:
+            return false;
+        }
+        break;
+      case PP_VIDEO_CAPTURE_STATUS_PAUSED:
+        switch (status_) {
+          case PP_VIDEO_CAPTURE_STATUS_STARTING:
+          case PP_VIDEO_CAPTURE_STATUS_STARTED:
+            break;
+          default:
+            return false;
+        }
+        break;
+      case PP_VIDEO_CAPTURE_STATUS_STOPPED:
+        if (status_ != PP_VIDEO_CAPTURE_STATUS_STOPPING)
+          return false;
+        break;
+    }
+    status_ = status;
+    return true;
+  }
+
+  void set_status(uint32_t status) { status_ = status; }
+
+  void SetBufferCount(size_t count) {
+    buffer_in_use_ = std::vector<bool>(count);
+  }
+  void SetBufferInUse(uint32_t buffer) {
+    DCHECK(buffer < buffer_in_use_.size());
+    buffer_in_use_[buffer] = true;
+  }
+
+ private:
+  uint32_t status_;
+  std::vector<bool> buffer_in_use_;
+  DISALLOW_COPY_AND_ASSIGN(VideoCapture);
+};
+
+VideoCapture::VideoCapture(const HostResource& resource)
+    : PluginResource(resource),
+      status_(PP_VIDEO_CAPTURE_STATUS_STOPPED) {
+}
+
+VideoCapture::~VideoCapture() {
+}
+
+VideoCapture* VideoCapture::AsVideoCapture() {
+  return this;
+}
+
+ppapi::thunk::PPB_VideoCapture_API* VideoCapture::AsPPB_VideoCapture_API() {
+  return this;
+}
+
+PPB_VideoCapture_Proxy::PPB_VideoCapture_Proxy(Dispatcher* dispatcher,
+                                               const void* target_interface)
+    : InterfaceProxy(dispatcher, target_interface) {
+}
+
+PPB_VideoCapture_Proxy::~PPB_VideoCapture_Proxy() {
+}
+
+// static
+const InterfaceProxy::Info* PPB_VideoCapture_Proxy::GetInfo() {
+  static const Info info = {
+    ppapi::thunk::GetPPB_VideoCapture_Thunk(),
+    PPB_VIDEO_CAPTURE_DEV_INTERFACE,
+    INTERFACE_ID_PPB_VIDEO_CAPTURE_DEV,
+    false,
+    &CreatePPBVideoCaptureProxy,
+  };
+  return &info;
+}
+
+// static
+PP_Resource PPB_VideoCapture_Proxy::CreateProxyResource(PP_Instance instance) {
+  PluginDispatcher* dispatcher = PluginDispatcher::GetForInstance(instance);
+  if (!dispatcher)
+    return 0;
+
+  HostResource result;
+  dispatcher->Send(new PpapiHostMsg_PPBVideoCapture_Create(
+      INTERFACE_ID_PPB_VIDEO_CAPTURE_DEV, instance, &result));
+  if (result.is_null())
+    return 0;
+
+  linked_ptr<VideoCapture> object(new VideoCapture(result));
+  return PluginResourceTracker::GetInstance()->AddResource(object);
+}
+
+bool PPB_VideoCapture_Proxy::OnMessageReceived(const IPC::Message& msg) {
+  bool handled = true;
+  IPC_BEGIN_MESSAGE_MAP(PPB_VideoCapture_Proxy, msg)
+    IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBVideoCapture_Create, OnMsgCreate)
+    IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBVideoCapture_StartCapture,
+                        OnMsgStartCapture)
+    IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBVideoCapture_ReuseBuffer,
+                        OnMsgReuseBuffer)
+    IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBVideoCapture_StopCapture,
+                        OnMsgStopCapture)
+    IPC_MESSAGE_UNHANDLED(handled = false)
+  IPC_END_MESSAGE_MAP()
+  // TODO(brettw) handle bad messages!
+  return handled;
+}
+
+void PPB_VideoCapture_Proxy::OnMsgCreate(
+    PP_Instance instance, HostResource* result_resource) {

[brettw, 2011/08/08 22:42:17]

First param should fit on the previous line.

[piman, 2011/08/09 02:31:39]

Done.

+  HostDispatcher* dispatcher = HostDispatcher::GetForInstance(instance);
+  if (!dispatcher)
+    return;
+  PP_Resource resource = ppb_video_capture_target()->Create(instance);
+  result_resource->SetHostResource(instance, resource);
+}
+
+void PPB_VideoCapture_Proxy::OnMsgStartCapture(
+    const HostResource& resource,
+    const PP_VideoCaptureDeviceInfo_Dev& info,
+    uint32_t buffers) {
+  EnterHostFromHostResource<PPB_VideoCapture_API> enter(resource);
+  if (enter.succeeded())
+    enter.object()->StartCapture(info, buffers);
+}
+
+void PPB_VideoCapture_Proxy::OnMsgReuseBuffer(const HostResource& resource,
+                                              uint32_t buffer) {
+  EnterHostFromHostResource<PPB_VideoCapture_API> enter(resource);
+  if (enter.succeeded())
+    enter.object()->ReuseBuffer(buffer);
+}
+
+void PPB_VideoCapture_Proxy::OnMsgStopCapture(const HostResource& resource) {
+  EnterHostFromHostResource<PPB_VideoCapture_API> enter(resource);
+  if (enter.succeeded())
+    enter.object()->StopCapture();
+}
+
+PPP_VideoCapture_Proxy::PPP_VideoCapture_Proxy(Dispatcher* dispatcher,
+                                               const void* target_interface)
+    : InterfaceProxy(dispatcher, target_interface) {
+}
+
+PPP_VideoCapture_Proxy::~PPP_VideoCapture_Proxy() {
+}
+
+// static
+const InterfaceProxy::Info* PPP_VideoCapture_Proxy::GetInfo() {
+  static const Info info = {
+    &ppp_video_capture,
+    PPP_VIDEO_CAPTURE_DEV_INTERFACE,
+    INTERFACE_ID_PPP_VIDEO_CAPTURE_DEV,
+    false,
+    &CreatePPPVideoCaptureProxy,
+  };
+  return &info;
+}
+
+bool PPP_VideoCapture_Proxy::OnMessageReceived(const IPC::Message& msg) {
+  bool handled = true;
+  IPC_BEGIN_MESSAGE_MAP(PPP_VideoCapture_Proxy, msg)
+    IPC_MESSAGE_HANDLER(PpapiMsg_PPPVideoCapture_OnDeviceInfo,
+                        OnMsgOnDeviceInfo)
+    IPC_MESSAGE_HANDLER(PpapiMsg_PPPVideoCapture_OnStatus, OnMsgOnStatus)
+    IPC_MESSAGE_HANDLER(PpapiMsg_PPPVideoCapture_OnError, OnMsgOnError)
+    IPC_MESSAGE_HANDLER(PpapiMsg_PPPVideoCapture_OnBufferReady,
+                        OnMsgOnBufferReady)
+    IPC_MESSAGE_UNHANDLED(handled = false)
+  IPC_END_MESSAGE_MAP()
+  // TODO(brettw) handle bad messages!
+  return handled;
+}
+
+void PPP_VideoCapture_Proxy::OnMsgOnDeviceInfo(
+    const HostResource& host_resource,
+    const PP_VideoCaptureDeviceInfo_Dev& info,
+    const std::vector<PPPVideoCapture_Buffer>& buffers) {
+  EnterPluginFromHostResource<PPB_VideoCapture_API> enter(host_resource);
+  PluginResourceTracker* tracker = PluginResourceTracker::GetInstance();
+  PP_Resource resource = tracker->PluginResourceForHostResource(host_resource);
+  if (!resource || !ppp_video_capture_target() || enter.failed())
+    return;
+
+  scoped_array<PP_Resource> resources(new PP_Resource[buffers.size()]);
+  for (size_t i = 0; i < buffers.size(); ++i) {
+    // We assume that the browser created a new set of resources.
+    DCHECK(!tracker->PluginResourceForHostResource(buffers[i].resource));
+    resources[i] = PPB_Buffer_Proxy::AddProxyResource(buffers[i].resource,
+                                                      buffers[i].handle,
+                                                      buffers[i].size);
+  }
+  static_cast<VideoCapture*>(enter.object())->SetBufferCount(buffers.size());
+  ppp_video_capture_target()->OnDeviceInfo(
+      host_resource.instance(),
+      resource,
+      &info,
+      buffers.size(),
+      resources.get());
+  for (size_t i = 0; i < buffers.size(); ++i)
+    tracker->ReleaseResource(resources[i]);
+}
+
+void PPP_VideoCapture_Proxy::OnMsgOnStatus(const HostResource& host_resource,
+                                           uint32_t status) {
+  EnterPluginFromHostResource<PPB_VideoCapture_API> enter(host_resource);
+  PluginResourceTracker* tracker = PluginResourceTracker::GetInstance();
+  PP_Resource resource = tracker->PluginResourceForHostResource(host_resource);
+  if (!resource || !ppp_video_capture_target() || enter.failed())
+    return;
+
+  if (!static_cast<VideoCapture*>(enter.object())->OnStatus(status))
+    return;
+  ppp_video_capture_target()->OnStatus(
+      host_resource.instance(), resource, status);
+}
+
+void PPP_VideoCapture_Proxy::OnMsgOnError(const HostResource& host_resource,
+                                          uint32_t error_code) {
+  EnterPluginFromHostResource<PPB_VideoCapture_API> enter(host_resource);
+  PluginResourceTracker* tracker = PluginResourceTracker::GetInstance();
+  PP_Resource resource = tracker->PluginResourceForHostResource(host_resource);
+  if (!resource || !ppp_video_capture_target() || enter.failed())
+    return;
+  static_cast<VideoCapture*>(enter.object())->set_status(
+      PP_VIDEO_CAPTURE_STATUS_STOPPED);
+  ppp_video_capture_target()->OnError(
+      host_resource.instance(), resource, error_code);
+}
+
+void PPP_VideoCapture_Proxy::OnMsgOnBufferReady(
+    const HostResource& host_resource, uint32_t buffer) {
+  EnterPluginFromHostResource<PPB_VideoCapture_API> enter(host_resource);
+  PluginResourceTracker* tracker = PluginResourceTracker::GetInstance();
+  PP_Resource resource = tracker->PluginResourceForHostResource(host_resource);
+  if (!resource || !ppp_video_capture_target() || enter.failed())
+    return;
+  static_cast<VideoCapture*>(enter.object())->SetBufferInUse(buffer);
+  ppp_video_capture_target()->OnBufferReady(
+      host_resource.instance(), resource, buffer);
+}
+
+}  // namespace proxy
+}  // namespace pp