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| Allegro audio stream outputs no sound |
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iam_donald
Member #14,318
May 2012
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I'm having a problem implementing audio playback via a stream with allegro. The audio stream initializes, loads the audio (a .wav file) and al_get_audio_stream_playing doe return true but there is no sound whatsoever. al_get_audio_stream_fragment also returns a valid pointer for the subsequent stream fragments. Here are the functions that I call for this to happen. 1/** Initializes the audio system
2 @return a pointer to an initialized Audio struct
3 */
4 Audio * init_audio()
5 {
6 if(! al_install_audio()){ perror_with_context("Failed to install audio", __LINE__, __FILE__); exit(EXIT_FAILURE); }
7 else
8 {
9 if(! al_init_acodec_addon()) { perror_with_context("Failed to initialize the codec addon", __LINE__, __FILE__); exit(EXIT_FAILURE); }
10 else
11 {
12 if(! al_reserve_samples(MAX_SAMPLES_NUMBER)){ perror_with_context("Failed to reserve channels", __LINE__, __FILE__); exit(EXIT_FAILURE); }
13 }
14 }
15
16 Audio * audio = (Audio *) malloc(sizeof(Audio));
17 audio->mixer = al_get_default_mixer();
18 audio->stream = NULL;
19 audio->stream_loaded = false;
20 if(! audio->mixer)
21 { perror_with_context("Failed to get the default mixer", __LINE__, __FILE__); exit(EXIT_FAILURE); }
22 return audio;
23 }
24
25 /** Loads an audio stream
26 @param the path to the to-be-loaded audio stream
27 @param a pointer to an Audio struct
28 @return a boolean, indicating whether the audio stream was loaded or !
29 */
30 void load_audio_stream(const char * stream_path, ALLEGRO_EVENT_QUEUE * queue, Audio * audio)
31 {
32 audio->stream = al_load_audio_stream(stream_path, MAX_BUFFER_NUMBER, MAX_STREAM_SAMPLES_NUMBER);
33 if(! audio->stream) { perror_with_context("Failed to load the audio stream", __LINE__, __FILE__); exit(EXIT_FAILURE); }
34 else
35 {
36 al_register_event_source(queue, al_get_audio_stream_event_source(audio->stream));
37 if(! al_attach_audio_stream_to_mixer(audio->stream, audio->mixer))
38 { perror_with_context("Failed to attach the audio stream to the mixer", __LINE__, __FILE__); exit(EXIT_FAILURE); }
39 audio->stream_loaded = true;
40 }
41 }
42
43 /** Streams audio
44 @param a pointer to an Audio struct
45 @param a pointer to an ALLEGRO_EVENT struct
46 */
47 void stream_audio(Audio * audio, const ALLEGRO_EVENT * event)
48 {
49 if(event->type == ALLEGRO_EVENT_AUDIO_STREAM_FRAGMENT)
50 {
51 void * stream_fragment = al_get_audio_stream_fragment(audio->stream);
52 al_set_audio_stream_fragment(audio->stream, stream_fragment);
53 }
54 else if(event->type == ALLEGRO_EVENT_AUDIO_STREAM_FINISHED) { al_drain_audio_stream(audio->stream); }
55 }
56
57 /** Terminates an audio stream
58 @param a pointer to an Audio struct
59 */
60 void end_audio_stream(Audio * audio)
61 {
62 if(audio->stream != NULL)
63 {
64 al_detach_audio_stream(audio->stream);
65 al_destroy_audio_stream(audio->stream);
66 }
67 }
68
69void run_event(Game_event_queue * game_event_queue, Levels * levels, Videos * videos, Audio * audio, ALLEGRO_EVENT_QUEUE * queue, ALLEGRO_EVENT * event)
70 {
71 if(event->type == ALLEGRO_EVENT_TIMER)
72 {
73 play_video(game_event_queue, videos, audio, queue);
74 }
75 else if((event->type == ALLEGRO_EVENT_AUDIO_STREAM_FRAGMENT) || (event->type == ALLEGRO_EVENT_AUDIO_STREAM_FINISHED)) { stream_audio(audio, event); }
76 }
Not sure what I'm doing wrong here. Your feedback would be gladly appreciated. Update Fixed it. |
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