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PCM sound, refactored code940

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git-svn-id: file:///home/notaz/opt/svn/PicoDrive@27 be3aeb3a-fb24-0410-a615-afba39da0efa
This commit is contained in:
notaz 2007-02-04 17:15:31 +00:00
parent 7573607016
commit 4f265db776
28 changed files with 914 additions and 312 deletions
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58
Pico/sound/ym2612.c
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@ -1,5 +1,5 @@
/*
** This is a bunch of remains of original fm.c from MAME project. All stuff
** This is a bunch of remains of original fm.c from MAME project. All stuff
** unrelated to ym2612 was removed, multiple chip support was removed,
** some parts of code were slightly rewritten and tied to the emulator.
**
@ -112,6 +112,7 @@
#include <math.h>
#include "ym2612.h"
#include "mix.h"
#ifndef EXTERNAL_YM2612
#include <stdlib.h>
@ -120,7 +121,6 @@ static YM2612 ym2612;
#else
extern YM2612 *ym2612_940;
extern int *mix_buffer;
#define ym2612 (*ym2612_940)
#endif
@ -1584,13 +1584,12 @@ INT32 *ym2612_dacout;
/* Generate samples for YM2612 */
void YM2612UpdateOne_(short *buffer, int length, int stereo)
int YM2612UpdateOne_(int *buffer, int length, int stereo, int is_buf_empty)
{
int pan;
#ifndef EXTERNAL_YM2612
int i;
static int *mix_buffer = 0, mix_buffer_length = 0;
#endif
// if !is_buf_empty, it means it has valid samples to mix with, else it may contain trash
if (is_buf_empty) memset32(buffer, 0, length<<stereo);
/* refresh PG and EG */
refresh_fc_eg_chan( &ym2612.CH[0] );
@ -1613,44 +1612,15 @@ void YM2612UpdateOne_(short *buffer, int length, int stereo)
pan = ym2612.OPN.pan;
if (stereo) stereo = 1;
#ifndef EXTERNAL_YM2612
if (mix_buffer_length < length) {
mix_buffer = realloc(mix_buffer, length*4<<stereo); // FIXME: need to free this at some point
if (!mix_buffer) return;
mix_buffer_length = length;
}
#endif
memset(mix_buffer, 0, length*4<<stereo);
/* mix to 32bit dest */
chan_render(buffer, length, &ym2612.CH[0], stereo|((pan&0x003)<<4)); // flags: stereo, lastchan, disabled, ?, pan_r, pan_l
chan_render(buffer, length, &ym2612.CH[1], stereo|((pan&0x00c)<<2));
chan_render(buffer, length, &ym2612.CH[2], stereo|((pan&0x030) ));
chan_render(buffer, length, &ym2612.CH[3], stereo|((pan&0x0c0)>>2));
chan_render(buffer, length, &ym2612.CH[4], stereo|((pan&0x300)>>4));
chan_render(buffer, length, &ym2612.CH[5], stereo|((pan&0xc00)>>6)|(ym2612.dacen<<2)|2);
/* mix to 32bit temporary buffer */
chan_render(mix_buffer, length, &ym2612.CH[0], stereo|((pan&0x003)<<4)); // flags: stereo, lastchan, disabled, ?, pan_r, pan_l
chan_render(mix_buffer, length, &ym2612.CH[1], stereo|((pan&0x00c)<<2));
chan_render(mix_buffer, length, &ym2612.CH[2], stereo|((pan&0x030) ));
chan_render(mix_buffer, length, &ym2612.CH[3], stereo|((pan&0x0c0)>>2));
chan_render(mix_buffer, length, &ym2612.CH[4], stereo|((pan&0x300)>>4));
chan_render(mix_buffer, length, &ym2612.CH[5], stereo|((pan&0xc00)>>6)|(ym2612.dacen<<2)|2);
#ifndef EXTERNAL_YM2612
/* limit and mix to output buffer */
if (stereo) {
int *mb = mix_buffer;
for (i = length; i > 0; i--) {
int l, r;
l = r = *buffer;
l += *mb++, r += *mb++;
Limit( l, MAXOUT, MINOUT );
Limit( r, MAXOUT, MINOUT );
*buffer++ = l; *buffer++ = r;
}
} else {
for (i = 0; i < length; i++) {
int l = mix_buffer[i];
l += buffer[i];
Limit( l, MAXOUT, MINOUT );
buffer[i] = l;
}
}
#endif
return 1; // buffer updated
}