def METHOD_NAME(self, output, outputChannelIndex):
    outputMap = self.getOutputMap(output)
    try:
        outputChannel = outputMap[str(outputChannelIndex)]
        inputID = outputChannel['input']
        inputChannelIndex = outputChannel['channel_index']
    except KeyError:
        res = self.test.FAIL("Could not find 'input' or 'channel_index' field in /active "
                             "for Output {} channel {}".format(output.id, outputChannelIndex))
        raise NMOSTestException(res)
    return inputID, inputChannelIndex