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ex_acodec_multi.c
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ex_acodec_multi.c
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/*
* Milan Mimica
* Audio example that plays multiple files at the same time
* Originlly derived from the ex_acodec example.
*/
#include <stdio.h>
#include "allegro5/allegro.h"
#include "allegro5/allegro_audio.h"
#include "allegro5/allegro_acodec.h"
#include "common.c"
char *default_files[] = {NULL, "data/welcome.voc",
"data/haiku/earth_0.ogg", "data/haiku/water_0.ogg",
"data/haiku/fire_0.ogg", "data/haiku/air_0.ogg"};
int main(int argc, char **argv)
{
int i;
ALLEGRO_SAMPLE **sample_data;
ALLEGRO_SAMPLE_INSTANCE **sample;
ALLEGRO_MIXER *mixer;
ALLEGRO_VOICE *voice;
float longest_sample;
if (!al_init()) {
abort_example("Could not init Allegro.\n");
}
open_log();
if (argc < 2) {
log_printf("This example can be run from the command line.\nUsage: %s {audio_files}\n", argv[0]);
argv = default_files;
argc = 6;
}
al_init_acodec_addon();
if (!al_install_audio()) {
abort_example("Could not init sound!\n");
}
sample = malloc(argc * sizeof(*sample));
if (!sample) {
abort_example("Out of memory!\n");
}
sample_data = malloc(argc * sizeof(*sample_data));
if (!sample_data) {
abort_example("Out of memory!\n");
}
/* a voice is used for playback */
voice = al_create_voice(44100, ALLEGRO_AUDIO_DEPTH_INT16,
ALLEGRO_CHANNEL_CONF_2);
if (!voice) {
abort_example("Could not create ALLEGRO_VOICE from sample\n");
}
mixer = al_create_mixer(44100, ALLEGRO_AUDIO_DEPTH_FLOAT32,
ALLEGRO_CHANNEL_CONF_2);
if (!mixer) {
abort_example("al_create_mixer failed.\n");
}
if (!al_attach_mixer_to_voice(mixer, voice)) {
abort_example("al_attach_mixer_to_voice failed.\n");
}
for (i = 1; i < argc; ++i) {
const char *filename = argv[i];
sample[i] = NULL;
/* loads the entire sound file from disk into sample data */
sample_data[i] = al_load_sample(filename);
if (!sample_data[i]) {
abort_example("Could not load sample from '%s'!\n", filename);
}
sample[i] = al_create_sample_instance(sample_data[i]);
if (!sample[i]) {
log_printf("Could not create sample!\n");
al_destroy_sample(sample_data[i]);
sample_data[i] = NULL;
continue;
}
if (!al_attach_sample_instance_to_mixer(sample[i], mixer)) {
log_printf("al_attach_sample_instance_to_mixer failed.\n");
continue;
}
}
longest_sample = 0;
for (i = 1; i < argc; ++i) {
const char *filename = argv[i];
float sample_time;
if (!sample[i])
continue;
/* play each sample once */
al_play_sample_instance(sample[i]);
sample_time = al_get_sample_instance_time(sample[i]);
log_printf("Playing '%s' (%.3f seconds)\n", filename, sample_time);
if (sample_time > longest_sample)
longest_sample = sample_time;
}
al_rest(longest_sample);
log_printf("Done\n");
for (i = 1; i < argc; ++i) {
/* free the memory allocated when creating the sample + voice */
if (sample[i]) {
al_stop_sample_instance(sample[i]);
al_destroy_sample_instance(sample[i]);
al_destroy_sample(sample_data[i]);
}
}
al_destroy_mixer(mixer);
al_destroy_voice(voice);
free(sample);
free(sample_data);
al_uninstall_audio();
close_log(true);
return 0;
}