Implement host side of sync EnumerateVideoCaptureDevices

This implements the host side of the sync ppapi function EnumerateVideoCaptureDevices. 


BUG=none
TEST=Wrote a sample that runs the sync and non-sync versions. Ran it and compared the outputs.

Review URL: https://chromiumcodereview.appspot.com/11016007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@162048 0039d316-1c4b-4281-b951-d872f2087c98

5 files changed, 258 insertions, 2 deletions

diff --git a/ppapi/cpp/private/flash.cc b/ppapi/cpp/private/flash.cc
index 3a3da4e..5707b70 100644
--- a/ppapi/cpp/private/flash.cc
+++ b/ppapi/cpp/private/flash.cc
@@ -8,7 +8,9 @@
 
 #include "ppapi/c/pp_bool.h"
 #include "ppapi/c/pp_errors.h"
+#include "ppapi/cpp/dev/device_ref_dev.h"
 #include "ppapi/cpp/dev/font_dev.h"
+#include "ppapi/cpp/dev/video_capture_dev.h"
 #include "ppapi/cpp/image_data.h"
 #include "ppapi/cpp/instance_handle.h"
 #include "ppapi/cpp/module.h"
@@ -24,6 +26,10 @@ namespace pp {
 
 namespace {
 
+template <> const char* interface_name<PPB_Flash_12_6>() {
+  return PPB_FLASH_INTERFACE_12_6;
+}
+
 template <> const char* interface_name<PPB_Flash_12_5>() {
   return PPB_FLASH_INTERFACE_12_5;
 }
@@ -53,7 +59,10 @@ PPB_Flash flash_12_combined_interface;
 void InitializeCombinedInterface() {
   if (initialized_combined_interface)
     return;
-  if (has_interface<PPB_Flash_12_5>()) {
+  if (has_interface<PPB_Flash_12_6>()) {
+    memcpy(&flash_12_combined_interface, get_interface<PPB_Flash_12_6>(),
+           sizeof(PPB_Flash_12_6));
+  } else if (has_interface<PPB_Flash_12_5>()) {
     memcpy(&flash_12_combined_interface, get_interface<PPB_Flash_12_5>(),
            sizeof(PPB_Flash_12_5));
   } else if (has_interface<PPB_Flash_12_4>()) {
@@ -72,7 +81,8 @@ namespace flash {
 
 // static
 bool Flash::IsAvailable() {
-  return has_interface<PPB_Flash_12_5>() ||
+  return has_interface<PPB_Flash_12_6>() ||
+         has_interface<PPB_Flash_12_5>() ||
          has_interface<PPB_Flash_12_4>() ||
          has_interface<PPB_Flash_12_3>();
 }
@@ -246,6 +256,22 @@ bool Flash::SetCrashData(const InstanceHandle& instance,
 }
 
 // static
+int32_t Flash::EnumerateVideoCaptureDevices(
+    const InstanceHandle& instance,
+    const VideoCapture_Dev& video_capture,
+    std::vector<DeviceRef_Dev>* devices_out) {
+  InitializeCombinedInterface();
+  if (flash_12_combined_interface.EnumerateVideoCaptureDevices) {
+    ResourceArrayOutputAdapter<DeviceRef_Dev> adapter(devices_out);
+    return flash_12_combined_interface.EnumerateVideoCaptureDevices(
+        instance.pp_instance(),
+        video_capture.pp_resource(),
+        adapter.pp_array_output());
+  }
+  return PP_ERROR_FAILED;
+}
+
+// static
 bool Flash::InvokePrinting(const InstanceHandle& instance) {
   if (has_interface<PPB_Flash_Print_1_0>()) {
     get_interface<PPB_Flash_Print_1_0>()->InvokePrinting(
diff --git a/ppapi/cpp/private/flash.h b/ppapi/cpp/private/flash.h
index dc5f929..857c689 100644
--- a/ppapi/cpp/private/flash.h
+++ b/ppapi/cpp/private/flash.h
@@ -6,6 +6,7 @@
 #define PPAPI_CPP_PRIVATE_FLASH_H_
 
 #include <string>
+#include <vector>
 
 #include "ppapi/c/private/ppb_flash.h"
 #include "ppapi/c/pp_stdint.h"
@@ -15,6 +16,7 @@ struct PP_Point;
 
 namespace pp {
 
+class DeviceRef_Dev;
 class FontDescription_Dev;
 class ImageData;
 class InstanceHandle;
@@ -23,6 +25,7 @@ class Point;
 class Rect;
 class URLRequestInfo;
 class Var;
+class VideoCapture_Dev;
 
 namespace flash {
 
@@ -63,6 +66,9 @@ class Flash {
   static bool SetCrashData(const InstanceHandle& instance,
                            PP_FlashCrashKey key,
                            const pp::Var& value);
+  static int32_t EnumerateVideoCaptureDevices(const InstanceHandle& instance,
+      const VideoCapture_Dev& video_capture,
+      std::vector<DeviceRef_Dev>* devices_out);
 
   // PPB_Flash_Print.
   static bool InvokePrinting(const InstanceHandle& instance);
diff --git a/ppapi/examples/enumerate_devices/enumerate_devices.cc b/ppapi/examples/enumerate_devices/enumerate_devices.cc
new file mode 100644
index 0000000..383a0e5
--- /dev/null
+++ b/ppapi/examples/enumerate_devices/enumerate_devices.cc
@@ -0,0 +1,127 @@
+// 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 <assert.h>
+#include <string.h>
+
+#include <vector>
+
+#include "ppapi/c/dev/ppb_video_capture_dev.h"
+#include "ppapi/c/pp_errors.h"
+#include "ppapi/cpp/dev/device_ref_dev.h"
+#include "ppapi/cpp/dev/video_capture_dev.h"
+#include "ppapi/cpp/dev/video_capture_client_dev.h"
+#include "ppapi/cpp/completion_callback.h"
+#include "ppapi/cpp/instance.h"
+#include "ppapi/cpp/module.h"
+#include "ppapi/cpp/private/flash.h"
+#include "ppapi/cpp/var.h"
+#include "ppapi/utility/completion_callback_factory.h"
+
+// When compiling natively on Windows, PostMessage can be #define-d to
+// something else.
+#ifdef PostMessage
+#undef PostMessage
+#endif
+
+namespace {
+
+// This object is the global object representing this plugin library as long
+// as it is loaded.
+class EnumerateDevicesDemoModule : public pp::Module {
+ public:
+  EnumerateDevicesDemoModule() : pp::Module() {}
+  virtual ~EnumerateDevicesDemoModule() {}
+  virtual pp::Instance* CreateInstance(PP_Instance instance);
+};
+
+class EnumerateDevicesDemoInstance : public pp::Instance,
+                                     public pp::VideoCaptureClient_Dev {
+ public:
+  EnumerateDevicesDemoInstance(PP_Instance instance, pp::Module* module);
+  virtual ~EnumerateDevicesDemoInstance();
+
+  // pp::Instance implementation (see PPP_Instance).
+  virtual void HandleMessage(const pp::Var& message_data);
+
+  // pp::VideoCaptureClient_Dev implementation.
+  virtual void OnDeviceInfo(PP_Resource resource,
+                            const PP_VideoCaptureDeviceInfo_Dev& info,
+                            const std::vector<pp::Buffer_Dev>& buffers) {}
+  virtual void OnStatus(PP_Resource resource, uint32_t status) {}
+  virtual void OnError(PP_Resource resource, uint32_t error) {}
+  virtual void OnBufferReady(PP_Resource resource, uint32_t buffer) {}
+
+ private:
+  void EnumerateDevicesFinished(int32_t result,
+                                std::vector<pp::DeviceRef_Dev>& devices);
+
+  pp::VideoCapture_Dev video_capture_;
+  pp::CompletionCallbackFactory<EnumerateDevicesDemoInstance> callback_factory_;
+
+  std::vector<pp::DeviceRef_Dev> devices_;
+};
+
+EnumerateDevicesDemoInstance::EnumerateDevicesDemoInstance(PP_Instance instance,
+                                                           pp::Module* module)
+    : pp::Instance(instance),
+      pp::VideoCaptureClient_Dev(this),
+      video_capture_(this),
+      callback_factory_(this) {
+}
+
+EnumerateDevicesDemoInstance::~EnumerateDevicesDemoInstance() {
+}
+
+void EnumerateDevicesDemoInstance::HandleMessage(const pp::Var& message_data) {
+  if (message_data.is_string()) {
+    std::string event = message_data.AsString();
+    if (event == "EnumerateDevicesAsync") {
+      pp::CompletionCallbackWithOutput<std::vector<pp::DeviceRef_Dev> >
+          callback = callback_factory_.NewCallbackWithOutput(
+              &EnumerateDevicesDemoInstance::EnumerateDevicesFinished);
+      video_capture_.EnumerateDevices(callback);
+    } else if (event == "EnumerateDevicesSync") {
+      std::vector<pp::DeviceRef_Dev> devices;
+      int32_t result = pp::flash::Flash::EnumerateVideoCaptureDevices(
+          this, video_capture_, &devices);
+      EnumerateDevicesFinished(result, devices);
+    }
+  }
+}
+
+void EnumerateDevicesDemoInstance::EnumerateDevicesFinished(
+    int32_t result,
+    std::vector<pp::DeviceRef_Dev>& devices) {
+  static const char* const kDelimiter = "#__#";
+
+  if (result == PP_OK) {
+    devices_.swap(devices);
+    std::string device_names;
+    for (size_t index = 0; index < devices_.size(); ++index) {
+      pp::Var name = devices_[index].GetName();
+      assert(name.is_string());
+
+      if (index != 0)
+        device_names += kDelimiter;
+      device_names += name.AsString();
+    }
+    PostMessage(pp::Var("EnumerationSuccess" + device_names));
+  } else {
+    PostMessage(pp::Var("EnumerationFailed"));
+  }
+}
+
+pp::Instance* EnumerateDevicesDemoModule::CreateInstance(PP_Instance instance) {
+  return new EnumerateDevicesDemoInstance(instance, this);
+}
+
+}  // anonymous namespace
+
+namespace pp {
+// Factory function for your specialization of the Module object.
+Module* CreateModule() {
+  return new EnumerateDevicesDemoModule();
+}
+}  // namespace pp
diff --git a/ppapi/examples/enumerate_devices/enumerate_devices.html b/ppapi/examples/enumerate_devices/enumerate_devices.html
new file mode 100644
index 0000000..d77cadb
--- /dev/null
+++ b/ppapi/examples/enumerate_devices/enumerate_devices.html
@@ -0,0 +1,87 @@
+<!DOCTYPE html>
+<html>
+  <!--
+  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.
+  -->
+<head>
+  <title>Enumerate Devices Example</title>
+  <script type="text/javascript">
+    var device_array = [];
+    var enumerating = false;
+
+    function HandleMessage(message_event) {
+      if (message_event.data) {
+        var status = document.getElementById('status');
+        if (message_event.data == 'EnumerationFailed') {
+          status.innerText = 'Device enumeration failed!';
+        } else {
+          devices_data =
+              message_event.data.substring('EnumerationSuccess'.length);
+          if (devices_data.length > 0)
+            device_array = devices_data.split('#__#');
+          else
+            devices_array = [];
+
+          var list = document.getElementById('device_list');
+          if (devices_array.length == 0)
+            list.innerHTML = 'No devices.';
+          for (var i = 0; i < device_array.length; ++i) {
+            var list_item = document.createElement('li');
+            var span = document.createElement('span');
+            span.innerText = device_array[i];
+            list_item.appendChild(span);
+            list.appendChild(list_item);
+          }
+          status.innerText = 'Device enumeration success!';
+        }
+        enumerating = false;
+      }
+    }
+
+    function EnumerateDevices(sync) {
+      if (enumerating)
+        return;
+      enumerating = true;
+      var status = document.getElementById('status');
+      var plugin = document.getElementById('plugin');
+      if (sync) {
+        status.innerText = 'Enumerating devices sync...'
+        plugin.postMessage('EnumerateDevicesSync');
+      } else {
+        status.innerText = 'Enumerating devices async...'
+        plugin.postMessage('EnumerateDevicesAsync');
+      }
+    }
+    
+    function Initialize() {
+      var plugin = document.getElementById('plugin');
+      plugin.addEventListener('message', HandleMessage, false);
+      EnumerateDevices(true);
+    }
+
+    document.addEventListener('DOMContentLoaded', Initialize, false);
+  </script>
+</head>
+
+<body>
+  <embed id="plugin" type="application/x-ppapi-example-enumerate-devices"
+      width=0 height=0 />
+  <div>
+    Press a link to enumerate video devices:
+    <ul>
+      <li><a href="javascript:EnumerateDevices(true)">Enumerate devices sync</a>
+          (only implemented for out-of-process)</li>
+      <li><a href="javascript:EnumerateDevices(false)">Enumerate devices async</a></li>
+    </ul>
+  </div>
+  <div id="available_devices">
+    Available device(s):
+    <ul id="device_list">No devices.</ul>
+  </div>
+  <div>
+    Status: <span id="status"></span>
+  </div>
+</body>
+</html>
diff --git a/ppapi/ppapi_tests.gypi b/ppapi/ppapi_tests.gypi
index 6aa5499..48ae15e 100644
--- a/ppapi/ppapi_tests.gypi
+++ b/ppapi/ppapi_tests.gypi
@@ -412,6 +412,16 @@
       ],
     },
     {
+      'target_name': 'ppapi_example_enumerate_devices',
+      'dependencies': [
+        'ppapi_example_skeleton',
+        'ppapi.gyp:ppapi_cpp',
+      ],
+      'sources': [
+        'examples/enumerate_devices/enumerate_devices.cc',
+      ],
+    },
+    {
       'target_name': 'ppapi_example_flash_topmost',
       'dependencies': [
         'ppapi_example_skeleton',