Image Capture v4l2: reset all user controls to default values when closing device fd

media/capture/video/linux/v4l2_capture_delegate_unittest.cc

Index: media/capture/video/linux/v4l2_capture_delegate_unittest.cc
diff --git a/media/capture/video/linux/v4l2_capture_delegate_unittest.cc b/media/capture/video/linux/v4l2_capture_delegate_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..ad67ae5a86b32e8c95dde79afbbbebfde099411c
--- /dev/null
+++ b/media/capture/video/linux/v4l2_capture_delegate_unittest.cc
@@ -0,0 +1,257 @@
+// 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 <sys/fcntl.h>
+#include <sys/ioctl.h>
+
+#include "base/files/file_enumerator.h"
+#include "base/run_loop.h"
+#include "base/threading/thread_task_runner_handle.h"
+#include "media/capture/video/linux/v4l2_capture_delegate.h"
+#include "media/capture/video/video_capture_device.h"
+#include "media/capture/video/video_capture_device_descriptor.h"
+#include "media/capture/video_capture_types.h"
+#include "testing/gmock/include/gmock/gmock.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+using ::testing::_;
+
+namespace media {
+
+namespace {
+
+ACTION_P(RunClosure, closure) {
+  closure.Run();
+}
+
+// Base id and class identifiers for Controls to be modified and later tested
+// agains default values.
+static struct {
+  uint32_t control_base;
+  uint32_t class_id;
+} const kControls[] = {{V4L2_CID_USER_BASE, V4L2_CID_USER_CLASS},
+                       {V4L2_CID_CAMERA_CLASS_BASE, V4L2_CID_CAMERA_CLASS}};
+
+// Determines if |control_id| is special, i.e. controls another one's state.
+static bool IsSpecialControl(int control_id) {
+  switch (control_id) {
+    case V4L2_CID_AUTO_WHITE_BALANCE:
+    case V4L2_CID_EXPOSURE_AUTO:
+    case V4L2_CID_EXPOSURE_AUTO_PRIORITY:
+    case V4L2_CID_FOCUS_AUTO:
+      return true;
+  }
+  return false;
+}
+
+static void SetControlsToMaxValues(int device_fd) {
+  // Set V4L2_CID_AUTO_WHITE_BALANCE to false first.
+  v4l2_control auto_white_balance = {};
+  auto_white_balance.id = V4L2_CID_AUTO_WHITE_BALANCE;
+  auto_white_balance.value = false;
+  if (HANDLE_EINTR(ioctl(device_fd, VIDIOC_S_CTRL, &auto_white_balance)) < 0)
+    DPLOG(ERROR) << "VIDIOC_S_CTRL";
+
+  std::vector<struct v4l2_ext_control> special_camera_controls;
+  // Set V4L2_CID_EXPOSURE_AUTO to V4L2_EXPOSURE_MANUAL.
+  v4l2_ext_control auto_exposure = {};
+  auto_exposure.id = V4L2_CID_EXPOSURE_AUTO;
+  auto_exposure.value = V4L2_EXPOSURE_MANUAL;
+  special_camera_controls.push_back(auto_exposure);
+  // Set V4L2_CID_EXPOSURE_AUTO_PRIORITY to false.
+  v4l2_ext_control priority_auto_exposure = {};
+  priority_auto_exposure.id = V4L2_CID_EXPOSURE_AUTO_PRIORITY;
+  priority_auto_exposure.value = false;
+  special_camera_controls.push_back(priority_auto_exposure);
+  // Set V4L2_CID_FOCUS_AUTO to false.
+  v4l2_ext_control auto_focus = {};
+  auto_focus.id = V4L2_CID_FOCUS_AUTO;
+  auto_focus.value = false;
+  special_camera_controls.push_back(auto_focus);
+
+  struct v4l2_ext_controls ext_controls = {};
+  ext_controls.ctrl_class = V4L2_CID_CAMERA_CLASS;
+  ext_controls.count = special_camera_controls.size();
+  ext_controls.controls = special_camera_controls.data();
+  if (HANDLE_EINTR(ioctl(device_fd, VIDIOC_S_EXT_CTRLS, &ext_controls)) < 0)
+    DPLOG(ERROR) << "VIDIOC_S_EXT_CTRLS";
+
+  for (const auto& control : kControls) {
+    std::vector<struct v4l2_ext_control> camera_controls;
+
+    v4l2_queryctrl range = {};
+    range.id = control.control_base | V4L2_CTRL_FLAG_NEXT_CTRL;
+    while (0 == HANDLE_EINTR(ioctl(device_fd, VIDIOC_QUERYCTRL, &range))) {
+      if (V4L2_CTRL_ID2CLASS(range.id) != V4L2_CTRL_ID2CLASS(control.class_id))
+        break;
+      range.id |= V4L2_CTRL_FLAG_NEXT_CTRL;
+
+      if (IsSpecialControl(range.id & ~V4L2_CTRL_FLAG_NEXT_CTRL))
+        continue;
+      DVLOG(1) << __func__ << " " << range.name << " set to " << range.maximum;
+
+      struct v4l2_ext_control ext_control = {};
+      ext_control.id = range.id & ~V4L2_CTRL_FLAG_NEXT_CTRL;
+      ext_control.value = range.maximum;
+      camera_controls.push_back(ext_control);
+    }
+
+    if (!camera_controls.empty()) {
+      struct v4l2_ext_controls ext_controls = {};
+      ext_controls.ctrl_class = control.class_id;
+      ext_controls.count = camera_controls.size();
+      ext_controls.controls = camera_controls.data();
+      if (HANDLE_EINTR(ioctl(device_fd, VIDIOC_S_EXT_CTRLS, &ext_controls)) < 0)
+        DPLOG(ERROR) << "VIDIOC_S_EXT_CTRLS";
+    }
+
+    range.id = control.control_base | V4L2_CTRL_FLAG_NEXT_CTRL;
+    while (0 == HANDLE_EINTR(ioctl(device_fd, VIDIOC_QUERYCTRL, &range))) {
+      if (V4L2_CTRL_ID2CLASS(range.id) != V4L2_CTRL_ID2CLASS(control.class_id))
+        break;
+      range.id |= V4L2_CTRL_FLAG_NEXT_CTRL;
+
+      if (IsSpecialControl(range.id & ~V4L2_CTRL_FLAG_NEXT_CTRL))
+        continue;
+      DVLOG(1) << __func__ << " " << range.name << " set to " << range.maximum;
+
+      v4l2_control readback = {};
+      readback.id = range.id & ~V4L2_CTRL_FLAG_NEXT_CTRL;
+      if (HANDLE_EINTR(ioctl(device_fd, VIDIOC_G_CTRL, &readback)) < 0)
+        DPLOG(ERROR) << range.name << ", failed to be read.";
+      EXPECT_EQ(range.maximum, readback.value) << " control " << range.name
+                                               << " didnt set correctly";
+    }
+  }
+}
+
+static void VerifyUserControlsAreSetToDefaultValues(int device_fd) {
+  for (const auto& control : kControls) {
+    v4l2_queryctrl range = {};
+    range.id = control.control_base | V4L2_CTRL_FLAG_NEXT_CTRL;
+    while (0 == HANDLE_EINTR(ioctl(device_fd, VIDIOC_QUERYCTRL, &range))) {
+      if (V4L2_CTRL_ID2CLASS(range.id) != V4L2_CTRL_ID2CLASS(control.class_id))
+        break;
+      range.id |= V4L2_CTRL_FLAG_NEXT_CTRL;
+
+      DVLOG(1) << __func__ << " " << range.name << ": " << range.minimum << "-"
+               << range.maximum << ", default: " << range.default_value;
+
+      v4l2_control current = {};
+      current.id = range.id & ~V4L2_CTRL_FLAG_NEXT_CTRL;
+      if (HANDLE_EINTR(ioctl(device_fd, VIDIOC_G_CTRL, &current)) < 0)
+        DPLOG(ERROR) << "control " << range.name;
+
+      EXPECT_EQ(range.default_value, current.value);
+    }
+  }
+}
+
+class MockVideoCaptureDeviceClient : public VideoCaptureDevice::Client {
+ public:
+  MOCK_METHOD7(OnIncomingCapturedData,
+               void(const uint8_t*,
+                    int,
+                    const VideoCaptureFormat&,
+                    int,
+                    base::TimeTicks,
+                    base::TimeDelta,
+                    int));
+  MOCK_METHOD4(ReserveOutputBuffer,
+               std::unique_ptr<Buffer>(const gfx::Size&,
+                                       media::VideoPixelFormat,
+                                       media::VideoPixelStorage,
+                                       int));
+  void OnIncomingCapturedBuffer(std::unique_ptr<Buffer> buffer,
+                                const VideoCaptureFormat& frame_format,
+                                base::TimeTicks reference_time,
+                                base::TimeDelta timestamp) override {
+    DoOnIncomingCapturedBuffer();
+  }
+  MOCK_METHOD0(DoOnIncomingCapturedBuffer, void(void));
+  void OnIncomingCapturedVideoFrame(
+      std::unique_ptr<Buffer> buffer,
+      scoped_refptr<media::VideoFrame> frame) override {
+    DoOnIncomingCapturedVideoFrame();
+  }
+  MOCK_METHOD0(DoOnIncomingCapturedVideoFrame, void(void));
+  MOCK_METHOD4(ResurrectLastOutputBuffer,
+               std::unique_ptr<Buffer>(const gfx::Size&,
+                                       VideoPixelFormat,
+                                       VideoPixelStorage,
+                                       int));
+  MOCK_METHOD2(OnError,
+               void(const tracked_objects::Location& from_here,
+                    const std::string& reason));
+  MOCK_CONST_METHOD0(GetBufferPoolUtilization, double(void));
+};
+
+class V4L2CaptureDelegateTest : public ::testing::Test {
+ public:
+  V4L2CaptureDelegateTest()
+      : device_descriptor_("Device 0", "/dev/video0"),
+        delegate_(new V4L2CaptureDelegate(device_descriptor_,
+                                          base::ThreadTaskRunnerHandle::Get(),
+                                          50)) {}
+  ~V4L2CaptureDelegateTest() override = default;
+
+  base::MessageLoop loop_;
+  VideoCaptureDeviceDescriptor device_descriptor_;
+  scoped_refptr<V4L2CaptureDelegate> delegate_;
+};
+
+}  // anonymous namespace
+
+TEST_F(V4L2CaptureDelegateTest, CreateAndDestroyAndVerifyControls) {
+  // Check that there is at least a video device, otherwise bail.
+  const base::FilePath path("/dev/");
+  base::FileEnumerator enumerator(path, false, base::FileEnumerator::FILES,
+                                  "video*");
+  if (enumerator.Next().empty()) {
+    DLOG(INFO) << " No devices found, skipping test";
+    return;
+  }
+
+  // Open device, manipulate user and camera controls, and close it.
+  {
+    base::ScopedFD device_fd(
+        HANDLE_EINTR(open(device_descriptor_.device_id.c_str(), O_RDWR)));
+    ASSERT_TRUE(device_fd.is_valid());
+
+    SetControlsToMaxValues(device_fd.get());
+
+    base::RunLoop().RunUntilIdle();
+  }
+
+  // Start and stop capturing, triggering the resetting of user and camera
+  // control values.
+  {
+    std::unique_ptr<MockVideoCaptureDeviceClient> client(
+        new MockVideoCaptureDeviceClient());
+    MockVideoCaptureDeviceClient* client_ptr = client.get();
+    delegate_->AllocateAndStart(320 /* width */, 240 /* height */,
+                                10.0 /* frame_rate */, std::move(client));
+
+    base::RunLoop run_loop;
+    base::Closure quit_closure = run_loop.QuitClosure();
+    EXPECT_CALL(*client_ptr, OnIncomingCapturedData(_, _, _, _, _, _, _))
+        .Times(1)
+        .WillOnce(RunClosure(quit_closure));
+    run_loop.Run();
+
+    delegate_->StopAndDeAllocate();
+    base::RunLoop().RunUntilIdle();
+  }
+
+  // Reopen the device and verify all user and camera controls should be back to
+  // their |default_value|s.
+  {
+    base::ScopedFD device_fd(
+        HANDLE_EINTR(open(device_descriptor_.device_id.c_str(), O_RDWR)));
+    ASSERT_TRUE(device_fd.is_valid());
+    VerifyUserControlsAreSetToDefaultValues(device_fd.get());
+  }
+}
+
+};  // namespace media