gsttunerchannel @gsttunerchannel: the object which received the signal. @arg1: @gsttunerchannel: the object which received the signal. @arg1: @GST_TUNER_CHANNEL_INPUT: @GST_TUNER_CHANNEL_OUTPUT: @GST_TUNER_CHANNEL_FREQUENCY: @GST_TUNER_CHANNEL_AUDIO: @channel: @flag: