Places the effect on the device. If the effect is already on the device, the existing effect is updated to match the values set by the FFEffectSetParameters method.
- macOS 10.2+
An opaque reference handle to an effect object. This is obtained from a previous call to FFDeviceCreateEffect.
If the method succeeds, the return value is FF_OK or S_FALSE. If the method fails, the return value can be one of the following error values:
If the method returns S_FALSE, the effect has already been downloaded to the device.
It is valid to update an effect while it is playing. The semantics of such an operation are explained in the reference for FFEffectSetParameters.