Sample Instances and Mixers

Sample Instances and Mixers

KirbyDS11

Member #15,167

June 2013

I am having a problem with sample instances.
I tried to play the sample instance by using this code.

#SelectExpand
  1al_install_audio();
  2al_init_acodec_addon();
  3
  4ALLEGRO_SAMPLE *music=al_load_sample("song.ogg");
  5ALLEGRO_SAMPLE_INSTANCE *song=al_create_sample_instance(music);
  6al_set_sample_instance_playmode(song,ALLEGRO_PLAYMODE_LOOP);
  7al_attach_sample_instance_to_mixer(song,al_get_default_mixer());
  8
  9al_reserve_samples(1);
 10
 11al_play_sample_instance(song);

The program will start up fine but then an error message saying allegro audio test.exe has stopped working.
I then ran it in debug mode and found out that al_get_default_mixer() was causing the program to crash.
Then I tried to make a mixer with this code.

#SelectExpand
  1al_install_audio();
  2al_init_acodec_addon();
  3
  4ALLEGRO_SAMPLE *music=al_load_sample("song.ogg");
  5ALLEGRO_SAMPLE_INSTANCE *song=al_create_sample_instance(music);
  6al_set_sample_instance_playmode(song,ALLEGRO_PLAYMODE_LOOP);
  7ALLEGRO_MIXER *mixer=al_create_mixer(44100,ALLEGRO_AUDIO_DEPTH_FLOAT32
  8     ,ALLEGRO_CHANNEL_CONF_2);
  9al_attach_sample_instance_to_mixer(song,mixer);
 10
 11al_reserve_samples(1);
 12
 13al_play_sample_instance(song);

When I ran this code It did not crash but the song was not played.
With that said what did I do wrong with this code?

Woops

l j

Member #10,584

January 2009

al_reserve_samples is used for the default mixer and is not required if you use your own mixer, I think.

If you're trying to use your own mixer, you must first create an ALLEGRO_VOICE and attach your mixer to it.

KirbyDS11

Member #15,167

June 2013

Thank you
It work perfectly now.

Woops