test: delayed_controls: Fixup tests after recent DelayedControls changes

The recent fixes applied to DelayedControls change the behavior of the
library. As such, the tests ended up failing as they relied on the old
behavior of the helper. Update the tests to account for the new behavior
and get the tests passing again.

Specifically, the following changes have been made for each test:

singleControlNoDelay():
- Add a call to reset() to initialise internal DelayedControls state
only after setting the control on the device.
- Trigger a first frame start by calling applyControls() as a pipeline
handler would.
- Test frames from 1 onwards, as we will never have a queue item at
frame 0, since the reset() handles that.

singleControlWithDelay():
- Trigger a first frame start by calling applyControls() as a pipeline
handler would.
- Test frames from 1 onwards, as we will never have a queue item at
frame 0, since the reset() handles that.

dualControlsWithDelay() and dualControlsMultiQueue():
- Trigger a first frame start by calling applyControls() as a pipeline
handler would.
- Test frames from (startOffset + 1) onwards, as we will never have a
queue item at frame startOffset.
- Use the max delay (2 in this case) to determine the expected result
value.

Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

test/delayed_contols.cpp

@@ -82,9 +82,13 @@ protected:
 		/* Reset control to value not used in test. */
 		ctrls.set(V4L2_CID_BRIGHTNESS, 1);
 		dev_->setControls(&ctrls);
+		delayed->reset();
+
+		/* Trigger the first frame start event */
+		delayed->applyControls(0);
 
 		/* Test control without delay are set at once. */
-		for (unsigned int i = 0; i < 100; i++) {
+		for (unsigned int i = 1; i < 100; i++) {
 			int32_t value = 100 + i;
 
 			ctrls.set(V4L2_CID_BRIGHTNESS, value);
@@ -122,8 +126,11 @@ protected:
 		dev_->setControls(&ctrls);
 		delayed->reset();
 
+		/* Trigger the first frame start event */
+		delayed->applyControls(0);
+
 		/* Test single control with delay. */
-		for (unsigned int i = 0; i < 100; i++) {
+		for (unsigned int i = 1; i < 100; i++) {
 			int32_t value = 10 + i;
 
 			ctrls.set(V4L2_CID_BRIGHTNESS, value);
@@ -150,9 +157,11 @@ protected:
 
 	int dualControlsWithDelay(uint32_t startOffset)
 	{
+		static const unsigned int maxDelay = 2;
+
 		std::unordered_map<uint32_t, DelayedControls::ControlParams> delays = {
 			{ V4L2_CID_BRIGHTNESS, { 1, false } },
-			{ V4L2_CID_CONTRAST, { 2, false } },
+			{ V4L2_CID_CONTRAST, { maxDelay, false } },
 		};
 		std::unique_ptr<DelayedControls> delayed =
 			std::make_unique<DelayedControls>(dev_.get(), delays);
@@ -165,8 +174,11 @@ protected:
 		dev_->setControls(&ctrls);
 		delayed->reset();
 
+		/* Trigger the first frame start event */
+		delayed->applyControls(startOffset);
+
 		/* Test dual control with delay. */
-		for (unsigned int i = 0; i < 100; i++) {
+		for (unsigned int i = 1; i < 100; i++) {
 			uint32_t frame = startOffset + i;
 			int32_t value = 10 + i;
 
@@ -189,7 +201,7 @@ protected:
 				return TestFail;
 			}
 
-			expected = i < 1 ? expected : value - 1;
+			expected = i < maxDelay ? expected : value - 1;
 		}
 
 		return TestPass;
@@ -197,9 +209,11 @@ protected:
 
 	int dualControlsMultiQueue()
 	{
+		static const unsigned int maxDelay = 2;
+
 		std::unordered_map<uint32_t, DelayedControls::ControlParams> delays = {
 			{ V4L2_CID_BRIGHTNESS, { 1, false } },
-			{ V4L2_CID_CONTRAST, { 2, false } }
+			{ V4L2_CID_CONTRAST, { maxDelay, false } }
 		};
 		std::unique_ptr<DelayedControls> delayed =
 			std::make_unique<DelayedControls>(dev_.get(), delays);
@@ -212,6 +226,9 @@ protected:
 		dev_->setControls(&ctrls);
 		delayed->reset();
 
+		/* Trigger the first frame start event */
+		delayed->applyControls(0);
+
 		/*
 		 * Queue all controls before any fake frame start. Note we
 		 * can't queue up more then the delayed controls history size
@@ -226,8 +243,8 @@ protected:
 		}
 
 		/* Process all queued controls. */
-		for (unsigned int i = 0; i < 16; i++) {
+		for (unsigned int i = 1; i < 16; i++) {
-			int32_t value = 10 + i;
+			int32_t value = 10 + i - 1;
 
 			delayed->applyControls(i);
 
@@ -245,7 +262,7 @@ protected:
 				return TestFail;
 			}
 
-			expected = i < 1 ? expected : value - 1;
+			expected = i < maxDelay ? expected : value - 1;
 		}
 
 		return TestPass;