detect_midi_driver(3alleg4) [mojave man page]

detect_midi_driver(3alleg4)					  Allegro manual				       detect_midi_driver(3alleg4)

NAME

       detect_midi_driver - Detects whether the specified MIDI sound device is available. Allegro game programming library.

SYNOPSIS

       #include <allegro.h>

       int detect_midi_driver(int driver_id);

DESCRIPTION

       Detects whether the specified MIDI sound device is available. This function must be called _before_ install_sound().

RETURN VALUE

       Returns the maximum number of voices that the driver can provide, or zero if the hardware is not present.

       There  are two special-case return values that you should watch out for: if this function returns -1 it is a note-stealing driver (eg. DIG-
       MID) that shares voices with the current digital sound driver, and if it returns 0xFFFF it is an external  device  like	an  MPU-401  where
       there is no way to determine how many voices are available.

SEE ALSO

       install_sound(3alleg4), reserve_voices(3alleg4)

Allegro 							   version 4.4.2				       detect_midi_driver(3alleg4)

reserve_voices(3alleg4) 					  Allegro manual					   reserve_voices(3alleg4)

NAME

       reserve_voices - Reserve a number of voices for the digital and MIDI drivers. Allegro game programming library.

SYNOPSIS

       #include <allegro.h>

       void reserve_voices(int digi_voices, int midi_voices);

DESCRIPTION

       Call  this  function  to  specify the number of voices that are to be used by the digital and MIDI sound drivers respectively. This must be
       done _before_ calling install_sound(). If you reserve too many voices, subsequent calls to install_sound() will fail. How many  voices  are
       available  depends  on the driver, and in some cases you will actually get more than you reserve (eg. the FM synth drivers will always pro-
       vide 9 voices on an OPL2 and 18 on an OPL3, and the SB digital driver will round the number of voices up to the nearest power of two). Pass
       negative values to restore the default settings. You should be aware that the sound quality is usually inversely related to how many voices
       you use, so don't reserve any more than you really need.

SEE ALSO

       set_volume_per_voice(3alleg4), install_sound(3alleg4), detect_digi_driver(3alleg4), detect_midi_driver(3alleg4), get_mixer_voices(3alleg4)

Allegro 							   version 4.4.2					   reserve_voices(3alleg4)