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/*
===========================================================================
Copyright (C) 1999-2005 Id Software, Inc.
This file is part of Quake III Arena source code.
Quake III Arena source code is free software; you can redistribute it
and/or modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the License,
or (at your option) any later version.
Quake III Arena source code is distributed in the hope that it will be
useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Quake III Arena source code; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
===========================================================================
*/
// mac_snddma.c
// all other sound mixing is portable
#include "../client/snd_local.h"
#include <Carbon/Carbon.h>
// For 'ri'
#include "../renderer/tr_local.h"
#import <Foundation/NSZone.h>
// TJW - Different versions of SoundManager have different DMA buffer sizes. On MacOS X DP2,
// the buffer size is 8K. On MacOS 9 it is much smaller. The SoundManager guy at Apple says
// that the size of the buffer will be decreasing for final release to help get rid of latency.
//#define MAX_MIXED_SAMPLES (0x8000 * 64)
//#define SUBMISSION_CHUNK (0x100 * 64)
// Original MacOS 9 sizes
//#define MAX_MIXED_SAMPLES 0x8000
//#define SUBMISSION_CHUNK 0x100
static unsigned int submissionChunk;
static unsigned int maxMixedSamples;
static short *s_mixedSamples;
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 * submissionChunk ) & (maxMixedSamples-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 = submissionChunk / 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;
cvar_t *bufferSize;
cvar_t *chunkSize;
chunkSize = ri.Cvar_Get( "s_chunksize", "8192", CVAR_ARCHIVE );
bufferSize = ri.Cvar_Get( "s_buffersize", "65536", CVAR_ARCHIVE );
if (!chunkSize->integer) {
ri.Error(ERR_FATAL, "snd_chunkSize must be non-zero\n");
}
if (!bufferSize->integer) {
ri.Error(ERR_FATAL, "snd_bufferSize must be non-zero\n");
}
if (chunkSize->integer >= bufferSize->integer) {
ri.Error(ERR_FATAL, "snd_chunkSize must be less than snd_bufferSize\n");
}
if (bufferSize->integer % chunkSize->integer) {
ri.Error(ERR_FATAL, "snd_bufferSize must be an even multiple of snd_chunkSize\n");
}
// create a sound channel
s_sndChan = NULL;
err = SndNewChannel( &s_sndChan, sampledSynth, initStereo, NewSndCallBackProc(S_Callback) );
if ( err ) {
return false;
}
submissionChunk = chunkSize->integer;
maxMixedSamples = bufferSize->integer;
s_mixedSamples = NSZoneMalloc(NULL, sizeof(*s_mixedSamples) * maxMixedSamples);
dma.channels = 2;
dma.samples = maxMixedSamples;
dma.submission_chunk = submissionChunk;
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 * submissionChunk;
}
/*
===============
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) {
}
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