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