Created
May 10, 2011 21:17
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How I Load a .ogg into OpenAL Using stb_vorbis
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typedef struct{ | |
ALuint ID; | |
stb_vorbis* stream; | |
stb_vorbis_info info; | |
ALuint buffers[2]; | |
ALuint source; | |
ALenum format; | |
size_t bufferSize; | |
size_t totalSamplesLeft; | |
bool shouldLoop; | |
}AudioStream; | |
void AudioStreamInit(AudioStream* self){ | |
memset(self, 0, sizeof(AudioStream)); | |
alGenSources(1, & self->source); | |
alGenBuffers(2, self->buffers); | |
self->bufferSize=4096*8; | |
self->shouldLoop=true;//We loop by default | |
} | |
void AudioStreamDeinit(AudioStream* self){ | |
alDeleteSources(1, & self->source); | |
alDeleteBuffers(2, self->buffers); | |
stb_vorbis_close(self->stream); | |
memset(self, 0, sizeof(AudioStream)); | |
} | |
bool AudioStreamStream(AudioStream* self, ALuint buffer){ | |
//Uncomment this to avoid VLAs | |
//#define BUFFER_SIZE 4096*32 | |
#ifndef BUFFER_SIZE//VLAs ftw | |
#define BUFFER_SIZE (self->bufferSize) | |
#endif | |
ALshort pcm[BUFFER_SIZE]; | |
int size = 0; | |
int result = 0; | |
while(size < BUFFER_SIZE){ | |
result = stb_vorbis_get_samples_short_interleaved(self->stream, self->info.channels, pcm+size, BUFFER_SIZE-size); | |
if(result > 0) size += result*self->info.channels; | |
else break; | |
} | |
if(size == 0) return false; | |
alBufferData(buffer, self->format, pcm, size*sizeof(ALshort), self->info.sample_rate); | |
self->totalSamplesLeft-=size; | |
#undef BUFFER_SIZE | |
return true; | |
} | |
bool AudioStreamOpen(AudioStream* self, const char* filename){ | |
self->stream = stb_vorbis_open_filename((char*)filename, NULL, NULL); | |
if(not self->stream) return false; | |
// Get file info | |
self->info = stb_vorbis_get_info(self->stream); | |
if(self->info.channels == 2) self->format = AL_FORMAT_STEREO16; | |
else self->format = AL_FORMAT_MONO16; | |
if(not AudioStreamStream(self, self->buffers[0])) return false; | |
if(not AudioStreamStream(self, self->buffers[1])) return false; | |
alSourceQueueBuffers(self->source, 2, self->buffers); | |
alSourcePlay(self->source); | |
self->totalSamplesLeft=stb_vorbis_stream_length_in_samples(self->stream) * self->info.channels; | |
return true; | |
} | |
bool AudioStreamUpdate(AudioStream* self){ | |
ALint processed=0; | |
alGetSourcei(self->source, AL_BUFFERS_PROCESSED, &processed); | |
while(processed--){ | |
ALuint buffer=0; | |
alSourceUnqueueBuffers(self->source, 1, &buffer); | |
if(not AudioStreamStream(self, buffer)){ | |
bool shouldExit=true; | |
if(self->shouldLoop){ | |
stb_vorbis_seek_start(self->stream); | |
self->totalSamplesLeft=stb_vorbis_stream_length_in_samples(self->stream) * self->info.channels; | |
shouldExit=not AudioStreamStream(self, buffer); | |
} | |
if(shouldExit) return false; | |
} | |
alSourceQueueBuffers(self->source, 1, &buffer); | |
} | |
return true; | |
} |
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There're some places you wrote "not". Didn't you mean "!" (negate symbol)?