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(svn r18821) -Codechange: [Allegro] make the frequency and number of samples runtime configurable

release/1.0
rubidium 2010-01-15 23:47:28 +00:00
parent f74ce1890e
commit 21fff6407d
1 changed files with 7 additions and 5 deletions
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12
src/sound/allegro_s.cpp
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@ -22,7 +22,7 @@ static FSoundDriver_Allegro iFSoundDriver_Allegro;
/** The stream we are writing too */ /** The stream we are writing too */
static AUDIOSTREAM *_stream = NULL; static AUDIOSTREAM *_stream = NULL;
/** The number of samples in the buffer */ /** The number of samples in the buffer */
static const int BUFFER_SIZE = 4096; static int _buffer_size;
void SoundDriver_Allegro::MainLoop() void SoundDriver_Allegro::MainLoop()
{ {
@ -34,11 +34,11 @@ void SoundDriver_Allegro::MainLoop()
if (data == NULL) return; if (data == NULL) return;
/* Mix the samples */ /* Mix the samples */
MxMixSamples(data, BUFFER_SIZE); MxMixSamples(data, _buffer_size);
/* Allegro sound is always unsigned, so we need to correct that */ /* Allegro sound is always unsigned, so we need to correct that */
uint16 *snd = (uint16*)data; uint16 *snd = (uint16*)data;
for (int i = 0; i < BUFFER_SIZE * 2; i++) snd[i] ^= 0x8000; for (int i = 0; i < _buffer_size * 2; i++) snd[i] ^= 0x8000;
/* Tell we've filled the stream */ /* Tell we've filled the stream */
free_audio_stream_buffer(_stream); free_audio_stream_buffer(_stream);
@ -68,8 +68,10 @@ const char *SoundDriver_Allegro::Start(const char * const *parm)
return "No sound card found"; return "No sound card found";
} }
_stream = play_audio_stream(BUFFER_SIZE, 16, true, 44100, 255, 128); int hz = GetDriverParamInt(parm, "hz", 44100);
MxInitialize(44100); _buffer_size = GetDriverParamInt(parm, "samples", 1024) * hz / 11025;
_stream = play_audio_stream(_buffer_size, 16, true, hz, 255, 128);
MxInitialize(hz);
return NULL; return NULL;
} }