mirror of https://github.com/aufflick/kegs.git
155 lines
3.6 KiB
C
155 lines
3.6 KiB
C
/************************************************************************/
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/* KEGS: Apple //gs Emulator */
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/* Copyright 2002 by Kent Dickey */
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/* */
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/* This code is covered by the GNU GPL */
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/* */
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/* The KEGS web page is kegs.sourceforge.net */
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/* You may contact the author at: kadickey@alumni.princeton.edu */
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/************************************************************************/
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const char rcsid_macsnd_driver_c[] = "@(#)$KmKId: macsnd_driver.c,v 1.4 2003-10-17 15:57:40-04 kentd Exp $";
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#include "defc.h"
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#include "sound.h"
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#include <Carbon/Carbon.h>
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#include <unistd.h>
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#define MACSND_REBUF_SIZE (64*1024)
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#define MACSND_QUANTA 512
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/* MACSND_QUANTA must be >= 128 and a power of 2 */
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word32 g_macsnd_rebuf[MACSND_REBUF_SIZE];
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volatile word32 *g_macsnd_rebuf_ptr;
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volatile word32 *g_macsnd_rebuf_cur;
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volatile int g_macsnd_playing = 0;
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extern int Verbose;
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extern int g_audio_rate;
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extern word32 *g_sound_shm_addr;
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extern int g_sound_size;
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SndChannelPtr g_snd_channel_ptr;
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ExtSoundHeader g_snd_hdr;
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SndCommand g_snd_cmd;
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void
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mac_snd_callback(SndChannelPtr snd_chan_ptr, SndCommand *in_sndcmd)
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{
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OSStatus err;
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int samps;
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// This is an interrupt routine--no printf, etc!
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samps = g_macsnd_rebuf_ptr - g_macsnd_rebuf_cur;
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if(samps < 0) {
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samps += MACSND_REBUF_SIZE;
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}
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samps = samps & -(MACSND_QUANTA); // quantize to 1024 samples
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if(g_macsnd_rebuf_cur + samps > &(g_macsnd_rebuf[MACSND_REBUF_SIZE])) {
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samps = &(g_macsnd_rebuf[MACSND_REBUF_SIZE]) -
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g_macsnd_rebuf_cur;
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}
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if(samps > 0) {
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g_macsnd_playing = 1;
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g_snd_hdr.numFrames = samps;
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g_snd_hdr.loopEnd = samps;
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g_snd_hdr.samplePtr = (byte *)g_macsnd_rebuf_cur;
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g_snd_cmd.cmd = bufferCmd;
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g_snd_cmd.param1 = 0;
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g_snd_cmd.param2 = (long) &g_snd_hdr;
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g_macsnd_rebuf_cur += samps;
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if(g_macsnd_rebuf_cur >= &(g_macsnd_rebuf[MACSND_REBUF_SIZE])) {
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g_macsnd_rebuf_cur -= MACSND_REBUF_SIZE;
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}
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err = SndDoImmediate(g_snd_channel_ptr, &g_snd_cmd);
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// And set-up callback
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g_snd_cmd.cmd = callBackCmd;
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g_snd_cmd.param1 = 0;
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g_snd_cmd.param2 = 0;
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err = SndDoCommand(g_snd_channel_ptr, &g_snd_cmd, TRUE);
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} else {
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g_macsnd_playing = 0;
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}
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}
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int
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mac_send_audio(byte *ptr, int in_size)
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{
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SndCommand snd_cmd = {0};
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word32 *wptr, *macptr;
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word32 *eptr;
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int samps;
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int i;
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samps = in_size / 4;
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wptr = (word32 *)ptr;
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macptr = (word32 *)g_macsnd_rebuf_ptr;
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eptr = &g_macsnd_rebuf[MACSND_REBUF_SIZE];
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for(i = 0; i < samps; i++) {
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*macptr++ = *wptr++;
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if(macptr >= eptr) {
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macptr = &g_macsnd_rebuf[0];
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}
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}
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g_macsnd_rebuf_ptr = macptr;
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if(!g_macsnd_playing) {
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mac_snd_callback(g_snd_channel_ptr, &snd_cmd);
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}
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return in_size;
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}
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void
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child_sound_init_mac()
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{
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OSStatus err;
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mac_printf("In mac child\n");
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fflush(stdout);
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mac_printf("pid: %d\n", getpid());
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fflush(stdout);
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//return;
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//g_snd_channel_ptr = 0;
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err = SndNewChannel(&g_snd_channel_ptr, sampledSynth, initStereo,
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NewSndCallBackUPP(mac_snd_callback));
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mac_printf("SndNewChannel ret: %d\n", (int)err);
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fflush(stdout);
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memset(&g_snd_hdr, 0, sizeof(g_snd_hdr));
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g_snd_hdr.sampleSize = 16;
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g_snd_hdr.numChannels = 2;
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g_audio_rate = 44100;
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g_snd_hdr.sampleRate = g_audio_rate << 16;
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g_snd_hdr.numFrames = 0; // will be set in mac_send_audio
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g_snd_hdr.encode = extSH;
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g_snd_hdr.baseFrequency = 0;
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g_snd_hdr.samplePtr = 0;
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set_audio_rate(g_audio_rate);
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mac_printf("End of child_sound_init_mac\n");
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fflush(stdout);
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}
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void
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macsnd_init(word32 *shmaddr)
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{
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g_macsnd_rebuf_cur = &g_macsnd_rebuf[0];
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g_macsnd_rebuf_ptr = &g_macsnd_rebuf[0];
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mac_printf("macsnd_init called\n");
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child_sound_loop(-1, -1, shmaddr);
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}
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