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sound.c
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sound.c
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/*
* sound.c
*
* Sound subsystem for SR389 engine
*
*/
/* standard c and allegro includes */
#include <stdio.h>
#include <string.h>
#include "allegro5/allegro.h"
#include "allegro5/allegro_audio.h"
#include "allegro5/allegro_acodec.h"
#include "medlib.h"
#include "sound.h"
/* global music container - if music is playing, it's here */
ALLEGRO_AUDIO_STREAM *music;
/* voice for music output */
ALLEGRO_VOICE *voice;
/* allegro sound mixer */
ALLEGRO_MIXER *mixer;
/* functions - used to call to this library from other parts of engine */
unsigned int setupSound(void)
{
/* set up sound library for first use, and init allegro soundsystem */
music = NULL;
voice = NULL;
mixer = NULL;
if (!al_install_audio()) {
/* fail if audio does not load for some reason */
return 0;
}
if (!al_init_acodec_addon()) {
/* fail if audio does not load for some reason */
return 0;
}
if (!al_reserve_samples(8)) {
/* fail if audio does not load for some reason */
return 0;
}
mixer = al_create_mixer(44100, ALLEGRO_AUDIO_DEPTH_FLOAT32, ALLEGRO_CHANNEL_CONF_2);
voice = al_create_voice(44100, ALLEGRO_AUDIO_DEPTH_INT16, ALLEGRO_CHANNEL_CONF_2);
al_attach_mixer_to_voice(mixer, voice);
return true;
}
void playSound(const unsigned int index)
{
/* play sound by index number from library, standard volume */
al_play_sample(sndLib[index].data, 1.0, 0.0, 1.0, ALLEGRO_PLAYMODE_ONCE, NULL);
}
void playSoundByName(char *filename)
{
/* play sound by filename instead of index */
playSound(searchForSnd(filename));
}
void playMusic(const char *filename)
{
/* play music in background, on loop - unpause if music is already playing */
if (isMusicPaused())
{
unPauseMusic();
return;
}
/* music not playing, start over from beginning */
ALLEGRO_PLAYMODE loop = ALLEGRO_PLAYMODE_LOOP;
al_stop_samples();
if (music != NULL)
{
al_drain_audio_stream(music);
al_destroy_audio_stream(music);
}
music = al_load_audio_stream(filename, 4, 2048);
al_set_audio_stream_playmode(music, loop);
al_attach_audio_stream_to_mixer(music, mixer);
}
void playMusicOnce(const char *filename)
{
/* play music only once in background, terminating old music */
ALLEGRO_PLAYMODE loop = ALLEGRO_PLAYMODE_ONCE;
al_stop_samples();
if (music != NULL)
{
al_drain_audio_stream(music);
al_destroy_audio_stream(music);
}
music = al_load_audio_stream(filename, 4, 2048);
al_set_audio_stream_playmode(music, loop);
al_attach_audio_stream_to_mixer(music, mixer);
}
void pauseMusic(void)
{
/* pause game music */
if (music != NULL)
{
al_set_audio_stream_playing(music, false);
}
}
int isMusicPaused(void)
{
/* return true if music is paused */
if (music != NULL)
{
return !(al_get_audio_stream_playing(music));
}
return false;
}
void unPauseMusic(void)
{
/* unpause game music */
if (music != NULL)
{
al_set_audio_stream_playing(music, true);
}
}
void killSound(void)
{
/* terminate all sound and music playing in background */
al_stop_samples();
if (music != NULL)
{
al_drain_audio_stream(music);
al_destroy_audio_stream(music);
music = NULL;
}
}
void shutdownSound(void)
{
/* shutdown sound system when done */
al_stop_samples();
if (music != NULL)
{
al_destroy_audio_stream(music);
}
al_destroy_mixer(mixer);
al_destroy_voice(voice);
al_uninstall_audio();
}