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| Multiple audio stream causes static? |
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BulletDave4
Member #12,830
May 2011
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For the past few days, I have been working hard on adding an audio system to my game. So far, I have managed to set-up two different audio systems. The first is specialized for songs since they can be large. Note: all of my audio files are .ogg files. For the songs, I load them into an ALLEGRO_AUDIO_STREAM. The second is designed for sound effects. Note: they are also .ogg files. This time around I use an ALLEGRO_SAMPLE_INSTANCE. For some odd reason, when I play a song with multiple sound effects, I get static. I tried on other computers and on my headphones and its the same issue. I tried isolating the issue with little luck. All I noticed is that if I play a single sound, be it a song, or a sound effect, it will be clear, and the moment I begin adding other audio, it begins to fill-up with static. Note: For each song I am creating a new AUDIO_STREAM, MIXER, and VOICE. For each sound, I am creating a new MIXER, VOICE, SAMPLE, SAMPLE INSTANCE, AUDIO STREAM. I don't really know if its a bad thing having that many mixers/voices/samples. Here is how I create my song class: 1CSong::CSong( const char* filename, uint frequency,
2 size_t bufferCount, uint samples ) :
3 m_mixer(NULL), m_voice(NULL), m_stream(NULL)
4{
5 m_voice = al_create_voice( frequency, ALLEGRO_DEPTH_INT16,
6 ALLEGRO_CHANNEL_CONF_2 );
7 m_mixer = al_create_mixer( frequency, ALLEGRO_DEPTH_FLOAT32,
8 ALLEGRO_CHANNEL_CONF_2 );
9 al_attach_mixer_to_voice( m_mixer, m_voice );
10
11 m_stream = al_load_audio_stream( filename, bufferCount, samples );
12 al_attach_audio_stream_to_mixer( m_stream, m_mixer );
13
14 al_set_audio_stream_playmode( m_stream, ALLEGRO_PLAYMODE_LOOP );
15
16 setPlay( false );
17}
And here is how I create my sound class: 1CSound::CSound( const char* filename ) :
2 m_mixer(NULL), m_voice(NULL),
3 m_sample(NULL), m_sampleInstance(NULL),
4 m_position(0), m_audioStream(NULL)
5{
6 m_voice = al_create_voice( 44100, ALLEGRO_AUDIO_DEPTH_INT16,
7 ALLEGRO_CHANNEL_CONF_2 );
8 m_mixer = al_create_mixer( 44100, ALLEGRO_AUDIO_DEPTH_FLOAT32,
9 ALLEGRO_CHANNEL_CONF_2 );
10 al_attach_mixer_to_voice( m_mixer, m_voice );
11
12 m_sampleInstance = al_create_sample_instance( NULL );
13 m_sample = al_load_sample( filename );
14 al_set_sample( m_sampleInstance, m_sample );
15
16 al_attach_sample_instance_to_mixer( m_sampleInstance, m_mixer );
17 al_set_sample_instance_playmode( m_sampleInstance, ALLEGRO_PLAYMODE_ONCE );
18 al_play_sample_instance( m_sampleInstance );
19}
Additional info, here are my settings: Why might it be creating static??? |
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Matthew Leverton
Supreme Loser
January 1999
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Generally you only need a single voice and mixer. You definitely should not be creating one per song. If you call al_reserve_samples() that will automatically create a mixer. You can then call al_get_default_mixer(). Also, with al_reserve_samples() you can simply call al_play_sample() without creating your own instances... that's what it's for, after all. |
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BulletDave4
Member #12,830
May 2011
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I did exactly as you told me and it works great! No more static noise. Thanks a bunch |
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Peter Wang
Member #23
April 2000
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Fixed in r14803. This was due to the use of a global mixing buffer which obviously is wrong when two mixers run in parallel (which only happens when there are multiple voices). Not that you need multiple voices.
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