Mojo Video Capture service in media/capture

media/capture/service/video_capture_unittest.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 "base/command_line.h"
+#include "base/run_loop.h"
+#include "media/base/media_switches.h"
+#include "media/capture/interfaces/video_capture.mojom.h"
+#include "media/capture/service/mock_stream_client.h"
+#include "media/capture/service/stream_impl.h"
+#include "media/capture/service/video_capture_handler_impl.h"
+#include "media/capture/video/fake_video_capture_device_factory.h"
+#include "mojo/converters/geometry/geometry_type_converters.h"
+#include "testing/gmock/include/gmock/gmock.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+#if defined(OS_MACOSX)
+#include "media/base/mac/avfoundation_glue.h"
+#endif
+
+using ::testing::_;
+using ::testing::AnyNumber;
+using ::testing::InSequence;
+using ::testing::Field;
+
+namespace media {
+
+namespace {
+
+ACTION_P(RunClosure, closure) {
+  closure.Run();
+}
+
+void UseFakeFactory() {
+  base::CommandLine::ForCurrentProcess()->AppendSwitch(
+      switches::kUseFakeDeviceForMediaStream);
+}
+
+void UseRealFactory() {
+#if defined(OS_MACOSX)
+  AVFoundationGlue::InitializeAVFoundation();
+#endif
+}
+
+}  // anonymous namespace
+
+// This test coalesces all the classes and objects that conform a video capture
+// component from the outside. It then exercises the .mojom interfaces.
+// TODO(mcasas): This test is an integration test of sorts, but we use
+// a VideoCaptureHandlerImpl class directly and not via a Mojo pipe. Remove this
+// test when an VideoCapture Mojo App (i.e. a truly black box) test is landed.
+class VideoCaptureTest : public ::testing::Test {
+ public:
+  VideoCaptureTest() {}
+
+  void InitializeVideoCaptureHandlerImpl() {
+    video_capture_handler_impl_.reset(
+        new VideoCaptureHandlerImpl(nullptr /* app */));
+    base::RunLoop().RunUntilIdle();
+  }
+
+  void EnumerateDevices(
+      const VideoCaptureHandlerImpl::EnumerateDevicesCallback& callback) {
+    video_capture_handler_impl_->EnumerateDevices(callback);
+  }
+
+  MOCK_METHOD0(DoOnEnumerateDevicesReply, void(void));
+  void OnEnumerateDevicesReply(
+      mojo::Array<mojom::VideoCaptureDeviceInfoPtr> reply) {
+    DoOnEnumerateDevicesReply();
+    video_devices_info_ = std::move(reply);
+  }
+
+  MOCK_METHOD1(DoOnRequestVideoCaptureStreamReply,
+               void(const mojom::VideoCaptureStream&));
+  void OnRequestVideoCaptureStreamReply(mojom::VideoCaptureStreamPtr stream) {
+    EXPECT_TRUE(stream.is_bound());
+    DoOnRequestVideoCaptureStreamReply(*stream);
+    stream_ = std::move(stream);
+  }
+
+  // Enumerate devices to get a valid |id| for the first one.
+  void EnumerateDevices() {
+    VideoCaptureHandlerImpl::EnumerateDevicesCallback callback = base::Bind(
+        &VideoCaptureTest::OnEnumerateDevicesReply, base::Unretained(this));
+
+    base::RunLoop run_loop;
+    base::Closure quit_closure = run_loop.QuitClosure();
+    EXPECT_CALL(*this, DoOnEnumerateDevicesReply())
+        .Times(1)
+        .WillOnce(RunClosure(quit_closure));
+    EnumerateDevices(std::move(callback));
+
+    run_loop.Run();
+  }
+
+  // This block runs a RequestVideoCaptureStream() --> get a Stream().
+  void RequestVideoCaptureStream() {
+    mojom::VideoCaptureOptionsPtr options = mojom::VideoCaptureOptions::New();
+    options->device_id = video_devices_info_[0]->device_id;
+    options->capture_size = mojo::Size::From(gfx::Size(320, 240));
+    options->frame_rate = 30.0;
+
+    VideoCaptureHandlerImpl::RequestVideoCaptureStreamCallback callback =
+        base::Bind(&VideoCaptureTest::OnRequestVideoCaptureStreamReply,
+                   base::Unretained(this));
+    base::RunLoop run_loop;
+    base::Closure quit_closure = run_loop.QuitClosure();
+
+    EXPECT_CALL(*this, DoOnRequestVideoCaptureStreamReply(_))
+        .Times(1)
+        .WillOnce(RunClosure(quit_closure));
+
+    video_capture_handler_impl_->RequestVideoCaptureStream(std::move(options),
+                                                           std::move(callback));
+    run_loop.Run();
+    ASSERT_TRUE(!!stream_.get());
+  }
+
+  // Call Stream::Start() and expect some frames.
+  void StartAndExpectFrames() {
+    base::RunLoop run_loop;
+    base::Closure quit_closure = run_loop.QuitClosure();
+
+    EXPECT_CALL(stream_client_impl_, DoOnFrameAvailable(_, _)).Times(3);
+    EXPECT_CALL(stream_client_impl_, DoOnFrameAvailable(_, _))
+        .Times(1)
+        .WillOnce(RunClosure(quit_closure));
+    stream_->Start(stream_client_impl_.CreateProxy());
+
+    run_loop.Run();
+  }
+
+  void StartAndExpectFramesAndError() {
+    base::RunLoop run_loop;
+    base::Closure quit_closure = run_loop.QuitClosure();
+
+    EXPECT_CALL(stream_client_impl_, DoOnFrameAvailable(_, _))
+        .Times(AnyNumber());
+    stream_->Start(stream_client_impl_.CreateProxy());
+
+    EXPECT_CALL(stream_client_impl_, OnError(_))
+        .Times(1)
+        .WillOnce(RunClosure(quit_closure));
+
+    // Access the first and only StreamImpl and ping its OnError() callback.
+    ASSERT_EQ(1u, video_capture_handler_impl_->device_and_streams_.size());
+    video_capture_handler_impl_->device_and_streams_.begin()
+        ->second.second->OnError("Terrible error");
+    run_loop.Run();
+  }
+
+  void FakeOnErrorFromDevice() {}
+
+ protected:
+  // Needed for the mojo::ApplicationImpl inside VideoCaptureHandlerImpl.
+  const base::MessageLoop loop_;
+
+  // Need a SystemMonitor for VideoCaptureHandlerImpl to register to.
+  base::SystemMonitor system_monitor_;
+
+  // The component's entry point. Needs to be a scoped_ptr to be initialized
+  // after adding command line flag for the appropriate Device Factory.
+  scoped_ptr<VideoCaptureHandlerImpl> video_capture_handler_impl_;
+
+  // The mock of the (remote) video capture client.
+  MockStreamClient stream_client_impl_;
+
+  // Local pointer to the generated Stream spitting VideoFrames.
+  mojom::VideoCaptureStreamPtr stream_;
+
+  // Variable to hold on to the returned list of enumerated devices.
+  mojo::Array<mojom::VideoCaptureDeviceInfoPtr> video_devices_info_;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(VideoCaptureTest);
+};
+
+TEST_F(VideoCaptureTest, CreateAndDestroy) {}
+
+// Tests a full cycle EnumerateDevices() -> EnumerateDevicesReply ->
+// RequestVideoCaptureStream()-> RequestVideoCaptureStreamReply -> Start() ->
+// get frames. This test uses a FakeVideoCaptureDeviceFactory and succeeds all
+// right.
+TEST_F(VideoCaptureTest, RequestStreamAndStartAndCapture) {
+  InSequence s;
+  UseFakeFactory();
+  InitializeVideoCaptureHandlerImpl();
+  EnumerateDevices();
+  RequestVideoCaptureStream();
+
+  StartAndExpectFrames();
+  stream_->Stop();
+}
+
+// Tests a full cycle EnumerateDevices() -> EnumerateDevicesReply ->
+// RequestVideoCaptureStream()-> RequestVideoCaptureStreamReply -> Start() ->
+// Error !!!.
+TEST_F(VideoCaptureTest, RequestStreamAndStartAndError) {
+  InSequence s;
+  UseFakeFactory();
+  InitializeVideoCaptureHandlerImpl();
+  EnumerateDevices();
+  RequestVideoCaptureStream();
+
+  StartAndExpectFramesAndError();
+  stream_->Stop();
+}
+
+// Same as RequestStreamAndStartAndCapture, with a real capture device.
+TEST_F(VideoCaptureTest, RequestStreamAndStartAndCaptureWithRealDevice) {
+  InSequence s;
+
+  UseRealFactory();
+  InitializeVideoCaptureHandlerImpl();
+  EnumerateDevices();
+  if (video_devices_info_.size() == 0u)  // No real devices.
+    return;
+  RequestVideoCaptureStream();
+
+  StartAndExpectFrames();
+  stream_->Stop();
+}
+
+}  // namespace media