nsresult
MediaEngineRemoteVideoSource::UpdateSingleSource(
const AllocationHandle* aHandle,
const NormalizedConstraints& aNetConstraints,
const MediaEnginePrefs& aPrefs,
const nsString& aDeviceId,
const char** aOutBadConstraint)
{
if (!ChooseCapability(aNetConstraints, aPrefs, aDeviceId)) {
*aOutBadConstraint = FindBadConstraint(aNetConstraints, *this, aDeviceId);
return NS_ERROR_FAILURE;
}
switch (mState) {
case kReleased:
MOZ_ASSERT(aHandle);
if (camera::GetChildAndCall(&camera::CamerasChild::AllocateCaptureDevice,
mCapEngine, GetUUID().get(),
kMaxUniqueIdLength, mCaptureIndex,
aHandle->mPrincipalInfo)) {
return NS_ERROR_FAILURE;
}
mState = kAllocated;
SetLastCapability(mCapability);
LOG(("Video device %d allocated", mCaptureIndex));
break;
case kStarted:
if (mCapability != mLastCapability) {
camera::GetChildAndCall(&camera::CamerasChild::StopCapture,
mCapEngine, mCaptureIndex);
if (camera::GetChildAndCall(&camera::CamerasChild::StartCapture,
mCapEngine, mCaptureIndex, mCapability,
this)) {
LOG(("StartCapture failed"));
return NS_ERROR_FAILURE;
}
SetLastCapability(mCapability);
}
break;
default:
LOG(("Video device %d in ignored state %d", mCaptureIndex, mState));
break;
}
return NS_OK;
}
const char*
MediaConstraintsHelper::FindBadConstraint(
const NormalizedConstraints& aConstraints,
const MediaEngineSourceType& aMediaEngineSource,
const nsString& aDeviceId)
{
class MockDevice
{
public:
NS_INLINE_DECL_THREADSAFE_REFCOUNTING(MockDevice);
explicit MockDevice(const MediaEngineSourceType* aMediaEngineSource,
const nsString& aDeviceId)
: mMediaEngineSource(aMediaEngineSource),
// The following dud code exists to avoid 'unused typedef' error on linux.
mDeviceId(MockDevice::HasThreadSafeRefCnt::value ? aDeviceId : nsString()) {}
uint32_t GetBestFitnessDistance(
const nsTArray<const NormalizedConstraintSet*>& aConstraintSets,
bool aIsChrome)
{
return mMediaEngineSource->GetBestFitnessDistance(aConstraintSets,
mDeviceId);
}
private:
~MockDevice() {}
const MediaEngineSourceType* mMediaEngineSource;
nsString mDeviceId;
};
Unused << typename MockDevice::HasThreadSafeRefCnt();
nsTArray<RefPtr<MockDevice>> devices;
devices.AppendElement(new MockDevice(&aMediaEngineSource, aDeviceId));
return FindBadConstraint(aConstraints, devices);
}
