jediacademy/code/mac/mac_snddma.c

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2013-04-04 22:35:38 +00:00
// mac_snddma.c
// all other sound mixing is portable
#include "../client/snd_local.h"
#include <sound.h>
#define MAX_MIXED_SAMPLES 0x8000
#define SUBMISSION_CHUNK 0x100
static short s_mixedSamples[MAX_MIXED_SAMPLES];
static int s_chunkCount; // number of chunks submitted
static SndChannel *s_sndChan;
static ExtSoundHeader s_sndHeader;
/*
===============
S_Callback
===============
*/
void S_Callback( SndChannel *sc, SndCommand *cmd ) {
SndCommand mySndCmd;
SndCommand mySndCmd2;
int offset;
offset = ( s_chunkCount * SUBMISSION_CHUNK ) & (MAX_MIXED_SAMPLES-1);
// queue up another sound buffer
memset( &s_sndHeader, 0, sizeof( s_sndHeader ) );
s_sndHeader.samplePtr = (void *)(s_mixedSamples + offset);
s_sndHeader.numChannels = 2;
s_sndHeader.sampleRate = rate22khz;
s_sndHeader.loopStart = 0;
s_sndHeader.loopEnd = 0;
s_sndHeader.encode = extSH;
s_sndHeader.baseFrequency = 1;
s_sndHeader.numFrames = SUBMISSION_CHUNK / 2;
s_sndHeader.markerChunk = NULL;
s_sndHeader.instrumentChunks = NULL;
s_sndHeader.AESRecording = NULL;
s_sndHeader.sampleSize = 16;
mySndCmd.cmd = bufferCmd;
mySndCmd.param1 = 0;
mySndCmd.param2 = (int)&s_sndHeader;
SndDoCommand( sc, &mySndCmd, true );
// and another callback
mySndCmd2.cmd = callBackCmd;
mySndCmd2.param1 = 0;
mySndCmd2.param2 = 0;
SndDoCommand( sc, &mySndCmd2, true );
s_chunkCount++; // this is the next buffer we will submit
}
/*
===============
S_MakeTestPattern
===============
*/
void S_MakeTestPattern( void ) {
int i;
float v;
int sample;
for ( i = 0 ; i < dma.samples / 2 ; i ++ ) {
v = sin( M_PI * 2 * i / 64 );
sample = v * 0x4000;
((short *)dma.buffer)[i*2] = sample;
((short *)dma.buffer)[i*2+1] = sample;
}
}
/*
===============
SNDDMA_Init
===============
*/
qboolean SNDDMA_Init(void) {
int err;
// create a sound channel
s_sndChan = NULL;
err = SndNewChannel( &s_sndChan, sampledSynth, initStereo, NewSndCallBackProc(S_Callback) );
if ( err ) {
return false;
}
dma.channels = 2;
dma.samples = MAX_MIXED_SAMPLES;
dma.submission_chunk = SUBMISSION_CHUNK;
dma.samplebits = 16;
dma.speed = 22050;
dma.buffer = (byte *)s_mixedSamples;
// que up the first submission-chunk sized buffer
s_chunkCount = 0;
S_Callback( s_sndChan, NULL );
return qtrue;
}
/*
===============
SNDDMA_GetDMAPos
===============
*/
int SNDDMA_GetDMAPos(void) {
return s_chunkCount * SUBMISSION_CHUNK;
}
/*
===============
SNDDMA_Shutdown
===============
*/
void SNDDMA_Shutdown(void) {
if ( s_sndChan ) {
SndDisposeChannel( s_sndChan, true );
s_sndChan = NULL;
}
}
/*
===============
SNDDMA_BeginPainting
===============
*/
void SNDDMA_BeginPainting(void) {
}
/*
===============
SNDDMA_Submit
===============
*/
void SNDDMA_Submit(void) {
}