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detect_midi_driver(3alleg4) [opendarwin man page]

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

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)

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

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)
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