root/ppapi/proxy/video_capture_resource.cc

DEFINITIONS

1. enumeration_helper_
2. OnReplyReceived
3. EnumerateDevices
4. MonitorDeviceChange
5. Open
6. StartCapture
7. ReuseBuffer
8. StopCapture
9. Close
10. EnumerateDevicesSync
11. LastPluginRefWasDeleted
12. OnPluginMsgOnDeviceInfo
13. OnPluginMsgOnStatus
14. OnPluginMsgOnError
15. OnPluginMsgOnBufferReady
16. OnPluginMsgOpenReply
17. SetBufferInUse

// 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/plugin_globals.h"
#include "ppapi/proxy/plugin_resource_tracker.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/proxy_lock.h"
#include "ppapi/shared_impl/tracked_callback.h"

namespace ppapi {
namespace proxy {

VideoCaptureResource::VideoCaptureResource(
    Connection connection,
    PP_Instance instance,
    PluginDispatcher* dispatcher)
    : PluginResource(connection, instance),
      open_state_(BEFORE_OPEN),
      enumeration_helper_(this) {
  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 (enumeration_helper_.HandleReply(params, msg))
    return;

  if (params.sequence()) {
    PluginResource::OnReplyReceived(params, msg);
    return;
  }

  IPC_BEGIN_MESSAGE_MAP(VideoCaptureResource, msg)
    PPAPI_DISPATCH_PLUGIN_RESOURCE_CALL(
        PpapiPluginMsg_VideoCapture_OnDeviceInfo,
        OnPluginMsgOnDeviceInfo)
    PPAPI_DISPATCH_PLUGIN_RESOURCE_CALL(
        PpapiPluginMsg_VideoCapture_OnStatus,
        OnPluginMsgOnStatus)
    PPAPI_DISPATCH_PLUGIN_RESOURCE_CALL(
        PpapiPluginMsg_VideoCapture_OnError,
        OnPluginMsgOnError)
    PPAPI_DISPATCH_PLUGIN_RESOURCE_CALL(
        PpapiPluginMsg_VideoCapture_OnBufferReady,
        OnPluginMsgOnBufferReady)
    PPAPI_DISPATCH_PLUGIN_RESOURCE_CALL_UNHANDLED(NOTREACHED())
  IPC_END_MESSAGE_MAP()
}

int32_t VideoCaptureResource::EnumerateDevices(
    const PP_ArrayOutput& output,
    scoped_refptr<TrackedCallback> callback) {
  return enumeration_helper_.EnumerateDevices(output, callback);
}

int32_t VideoCaptureResource::MonitorDeviceChange(
    PP_MonitorDeviceChangeCallback callback,
    void* user_data) {
  return enumeration_helper_.MonitorDeviceChange(callback, user_data);
}

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::OnPluginMsgOpenReply, this));
  return PP_OK_COMPLETIONPENDING;
}

int32_t VideoCaptureResource::StartCapture() {
  if (open_state_ != OPENED)
    return PP_ERROR_FAILED;

  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() {
  if (open_state_ == CLOSED)
    return;

  Post(RENDERER, PpapiHostMsg_VideoCapture_Close());

  open_state_ = CLOSED;

  if (TrackedCallback::IsPending(open_callback_))
    open_callback_->PostAbort();
}

int32_t VideoCaptureResource::EnumerateDevicesSync(
    const PP_ArrayOutput& devices) {
  return enumeration_helper_.EnumerateDevicesSync(devices);
}

void VideoCaptureResource::LastPluginRefWasDeleted() {
  enumeration_helper_.LastPluginRefWasDeleted();
}

void VideoCaptureResource::OnPluginMsgOnDeviceInfo(
    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.TakeAllSharedMemoryHandles(&handles);
  CHECK(handles.size() == buffers.size());

  PluginResourceTracker* tracker =
      PluginGlobals::Get()->plugin_resource_tracker();
  scoped_ptr<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]));
    resources[i] = ppapi::proxy::PPB_Buffer_Proxy::AddProxyResource(
        buffers[i], handles[i], buffer_size);
  }

  buffer_in_use_ = std::vector<bool>(buffers.size());

  CallWhileUnlocked(ppp_video_capture_impl_->OnDeviceInfo,
                    pp_instance(),
                    pp_resource(),
                    &info,
                    static_cast<uint32_t>(buffers.size()),
                    const_cast<const PP_Resource*>(resources.get()));

  for (size_t i = 0; i < buffers.size(); ++i)
    tracker->ReleaseResource(resources[i]);
}

void VideoCaptureResource::OnPluginMsgOnStatus(
    const ResourceMessageReplyParams& params,
    uint32_t status) {
  switch (status) {
    case PP_VIDEO_CAPTURE_STATUS_STARTING:
    case PP_VIDEO_CAPTURE_STATUS_STOPPING:
      // Those states are not sent by the browser.
      NOTREACHED();
      break;
  }
  if (ppp_video_capture_impl_) {
    CallWhileUnlocked(ppp_video_capture_impl_->OnStatus,
                      pp_instance(),
                      pp_resource(),
                      status);
  }
}

void VideoCaptureResource::OnPluginMsgOnError(
    const ResourceMessageReplyParams& params,
    uint32_t error_code) {
  open_state_ = CLOSED;
  if (ppp_video_capture_impl_) {
    CallWhileUnlocked(ppp_video_capture_impl_->OnError,
                      pp_instance(),
                      pp_resource(),
                      error_code);
  }
}

void VideoCaptureResource::OnPluginMsgOnBufferReady(
    const ResourceMessageReplyParams& params,
    uint32_t buffer) {
  SetBufferInUse(buffer);
  if (ppp_video_capture_impl_) {
    CallWhileUnlocked(ppp_video_capture_impl_->OnBufferReady,
                      pp_instance(),
                      pp_resource(),
                      buffer);
  }
}

void VideoCaptureResource::OnPluginMsgOpenReply(
    const ResourceMessageReplyParams& params) {
  if (open_state_ == BEFORE_OPEN && params.result() == PP_OK)
    open_state_ = OPENED;

  // The callback may have been aborted by Close().
  if (TrackedCallback::IsPending(open_callback_))
    open_callback_->Run(params.result());
}

void VideoCaptureResource::SetBufferInUse(uint32_t buffer_index) {
  CHECK(buffer_index < buffer_in_use_.size());
  buffer_in_use_[buffer_index] = true;
}

}  // namespace proxy
}  // namespace ppapi