SND_CTL_MAKE_VIRTUAL - Online Linux Manual PageSection : 9
Updated : June 2018
Source : Kernel Hackers Manual 2​.6​.
Note : Control/Mixer API

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NAMEsnd_ctl_make_virtual_master − Create a virtual master control

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SYNOPSISstruct snd_kcontrol * snd_ctl_make_virtual_master(char * name, const unsigned int * tlv);

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ARGUMENTSname name string of the control element to create tlv optional TLV int array for dB information

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DESCRIPTIONCreates a virtual matster control with the given name string​. Returns the created control element, or NULL for errors (ENOMEM)​. After creating a vmaster element, you can add the slave controls via snd_ctl_add_slave or snd_ctl_add_slave_uncached​. The optional argument tlv can be used to specify the TLV information for dB scale of the master control​. It should be a single element with #SNDRV_CTL_TLVT_DB_SCALE, #SNDRV_CTL_TLV_DB_MINMAX or #SNDRV_CTL_TLVT_DB_MINMAX_MUTE type, and should be the max 0dB​.

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