[Mojo Video Capture] Use actual factory instances implementing media::VideoCaptureDeviceFactory

services/video_capture/video_capture_service.cc

 // Copyright 2016 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 "services/video_capture/video_capture_service.h"
 
-#include "media/capture/video/fake_video_capture_device.h"
+#include "base/message_loop/message_loop.h"
+#include "media/capture/video/fake_video_capture_device_factory.h"
+#include "media/capture/video/video_capture_buffer_pool.h"
+#include "media/capture/video/video_capture_buffer_tracker.h"
 #include "media/capture/video/video_capture_jpeg_decoder.h"
-#include "services/video_capture/video_capture_device_factory_impl.h"
+#include "services/video_capture/device_factory_media_to_mojo_adapter.h"
+#include "services/video_capture/mock_device_factory.h"
 
 namespace {
-static const char kFakeDeviceDisplayName[] = "Fake Video Capture Device";
-static const char kFakeDeviceId[] = "FakeDeviceId";
-static const char kFakeModelId[] = "FakeModelId";
-static const float kFakeCaptureDefaultFrameRate = 20.0f;
-
 // TODO(chfremer): Replace with an actual decoder factory.
 // https://crbug.com/584797
 std::unique_ptr<media::VideoCaptureJpegDecoder> CreateJpegDecoder() {
   return nullptr;
 }
 
 }  // anonymous namespace
 
 namespace video_capture {
 
-VideoCaptureService::VideoCaptureService() = default;
+VideoCaptureService::VideoCaptureService() : mock_device_factory_(nullptr) {}
 
 VideoCaptureService::~VideoCaptureService() = default;
 
 bool VideoCaptureService::OnConnect(
     const service_manager::ServiceInfo& remote_info,
     service_manager::InterfaceRegistry* registry) {
   registry->AddInterface<mojom::VideoCaptureService>(this);
   return true;
 }
 
@@ skipping 12 matching lines @@
 void VideoCaptureService::ConnectToFakeDeviceFactory(
     mojom::VideoCaptureDeviceFactoryRequest request) {
   LazyInitializeFakeDeviceFactory();
   fake_factory_bindings_.AddBinding(fake_device_factory_.get(),
                                     std::move(request));
 }
 
 void VideoCaptureService::ConnectToMockDeviceFactory(
     mojom::VideoCaptureDeviceFactoryRequest request) {
   LazyInitializeMockDeviceFactory();
-  mock_factory_bindings_.AddBinding(mock_device_factory_.get(),
+  mock_factory_bindings_.AddBinding(mock_device_factory_adapter_.get(),
                                     std::move(request));
 }
 
 void VideoCaptureService::AddDeviceToMockFactory(
     mojom::MockVideoCaptureDevicePtr device,
     const media::VideoCaptureDeviceDescriptor& descriptor,
     const AddDeviceToMockFactoryCallback& callback) {
   LazyInitializeMockDeviceFactory();
   mock_device_factory_->AddMockDevice(std::move(device), std::move(descriptor));
   callback.Run();
 }
 
 void VideoCaptureService::LazyInitializeDeviceFactory() {
   if (device_factory_)
     return;
-  device_factory_ = base::MakeUnique<VideoCaptureDeviceFactoryImpl>(
-      base::Bind(CreateJpegDecoder));
+
+  // Create the platform-specific device factory.
+  // Task runner does not seem to actually be used.

[mcasas, 2016/11/04 23:24:29]

Nit: it's actually used for CrOs implementation [1]
to observe the rotation of the screen (and by that,
the whole camera) in here [2].

[1]
https://cs.chromium.org/chromium/src/media/capture/video/video_capture_device...
[2]
https://cs.chromium.org/chromium/src/media/capture/video/linux/video_capture_...

[chfremer, 2016/11/07 18:42:37]

Thanks. I should have seen that.
Makes me wonder if this connection to a global |g_screen| will still work
running in the Mojo service instead of the Browser process. I will add a task to
investigate that to the design doc.

+  std::unique_ptr<media::VideoCaptureDeviceFactory> media_device_factory =
+      media::VideoCaptureDeviceFactory::CreateFactory(
+          base::MessageLoop::current()->task_runner());
+
+  device_factory_ = base::MakeUnique<DeviceFactoryMediaToMojoAdapter>(
+      std::move(media_device_factory), base::Bind(CreateJpegDecoder));
 }
 
 void VideoCaptureService::LazyInitializeFakeDeviceFactory() {
   if (fake_device_factory_)
     return;
-  fake_device_factory_ = base::MakeUnique<VideoCaptureDeviceFactoryImpl>(
-      base::Bind(CreateJpegDecoder));
-  media::VideoCaptureDeviceDescriptor fake_device_descriptor;
-  fake_device_descriptor.display_name = kFakeDeviceDisplayName;
-  fake_device_descriptor.device_id = kFakeDeviceId;
-  fake_device_descriptor.model_id = kFakeModelId;
-  fake_device_descriptor.capture_api = media::VideoCaptureApi::UNKNOWN;
-  fake_device_descriptor.transport_type =
-      media::VideoCaptureTransportType::OTHER_TRANSPORT;
-  fake_device_factory_->AddMediaDevice(
-      base::MakeUnique<media::FakeVideoCaptureDevice>(
-          media::FakeVideoCaptureDevice::BufferOwnership::OWN_BUFFERS,
-          kFakeCaptureDefaultFrameRate),
-      std::move(fake_device_descriptor));
+
+  auto media_fake_device_factory =
+      base::MakeUnique<media::FakeVideoCaptureDeviceFactory>();
+
+  fake_device_factory_ = base::MakeUnique<DeviceFactoryMediaToMojoAdapter>(
+      std::move(media_fake_device_factory), base::Bind(CreateJpegDecoder));

[mcasas, 2016/11/04 23:24:29]

This might work for l.90-94:

  fake_device_factory_ = base::MakeUnique<DeviceFactoryMediaToMojoAdapter>(
      new media::FakeVideoCaptureDeviceFactory(),
      base::Bind(&CreateJpegDecoder));

Also, note the & before the method, here an in l.108.

[chfremer, 2016/11/07 18:42:37]

Done.

 }
 
 void VideoCaptureService::LazyInitializeMockDeviceFactory() {
   if (mock_device_factory_)
     return;
-  mock_device_factory_ = base::MakeUnique<VideoCaptureDeviceFactoryImpl>(
-      base::Bind(CreateJpegDecoder));
+
+  auto mock_device_factory = base::MakeUnique<MockDeviceFactory>();
+  // We keep a pointer to the MockDeviceFactory as a member so that we can
+  // invoke its AddMockDevice(). Ownership of the MockDeviceFactory is moved
+  // to the DeviceFactoryMediaToMojoAdapter.
+  mock_device_factory_ = mock_device_factory.get();
+  mock_device_factory_adapter_ =
+      base::MakeUnique<DeviceFactoryMediaToMojoAdapter>(
+          std::move(mock_device_factory), base::Bind(CreateJpegDecoder));
 }
 
 }  // namespace video_capture