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desmume
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Fixed a few bugs with looping feature (looped sounds now play corectly when using PAlib) 

Changed interpolation to cosine interpolation (makes transitions smoother)
This commit is contained in:
luigi__ 2008-12-10 18:31:56 +00:00
parent 0501a23279
commit bb3be34cb9
1 changed files with 15 additions and 11 deletions
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26
desmume/src/SPU.cpp
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@ -21,6 +21,7 @@ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include "debug.h"
#include "ARM9.h"
@ -224,14 +225,14 @@ void SPU_struct::KeyOn(int channel)
{
case 0: // 8-bit
thischan.buf8 = (s8*)&MMU.MMU_MEM[1][(thischan.addr>>20)&0xFF][(thischan.addr & MMU.MMU_MASK[1][(thischan.addr >> 20) & 0xFF])];
thischan.loopstart = thischan.loopstart << 2;
thischan.length = (thischan.length << 2) + thischan.loopstart;
// thischan.loopstart = thischan.loopstart << 2;
// thischan.length = (thischan.length << 2) + thischan.loopstart;
thischan.sampcnt = 0;
break;
case 1: // 16-bit
thischan.buf16 = (s16 *)&MMU.MMU_MEM[1][(thischan.addr>>20)&0xFF][(thischan.addr & MMU.MMU_MASK[1][(thischan.addr >> 20) & 0xFF])];
thischan.loopstart = thischan.loopstart << 1;
thischan.length = (thischan.length << 1) + thischan.loopstart;
// thischan.loopstart = thischan.loopstart << 1;
// thischan.length = (thischan.length << 1) + thischan.loopstart;
thischan.sampcnt = 0;
break;
case 2: // ADPCM
@ -242,8 +243,8 @@ void SPU_struct::KeyOn(int channel)
thischan.index = thischan.buf8[2] & 0x7F;
thischan.lastsampcnt = 7;
thischan.sampcnt = 8;
thischan.loopstart = thischan.loopstart << 3;
thischan.length = (thischan.length << 3) + thischan.loopstart;
// thischan.loopstart = thischan.loopstart << 3;
// thischan.length = (thischan.length << 3) + thischan.loopstart;
break;
}
case 3: // PSG
@ -581,7 +582,8 @@ void SPU_WriteLong(u32 addr, u32 val)
static s32 Interpolate(s32 a, s32 b, double ratio)
{
ratio = ratio - (int)ratio;
return (1-ratio)*a + ratio*b;
double ratio2 = ((1.0f - cos(ratio * 3.14f)) / 2.0f);
return (((1-ratio2)*a) + (ratio2*b));
}
#endif
@ -724,13 +726,15 @@ static INLINE void MixLR(SPU_struct* SPU, channel_struct *chan, s32 data)
static INLINE void TestForLoop(SPU_struct *SPU, channel_struct *chan)
{
int shift = (chan->format == 0 ? 2 : 1);
chan->sampcnt += chan->sampinc;
if (chan->sampcnt > (double)chan->length)
if (chan->sampcnt > (double)((chan->length + chan->loopstart) << shift))
{
// Do we loop? Or are we done?
if (chan->repeat == 1)
chan->sampcnt = (double)chan->loopstart; // Is this correct?
chan->sampcnt = (double)(chan->loopstart << shift); // Is this correct?
else
{
chan->status = CHANSTAT_STOPPED;
@ -748,12 +752,12 @@ static INLINE void TestForLoop2(SPU_struct *SPU, channel_struct *chan)
{
chan->sampcnt += chan->sampinc;
if (chan->sampcnt > (double)chan->length)
if (chan->sampcnt > (double)((chan->length + chan->loopstart) << 3))
{
// Do we loop? Or are we done?
if (chan->repeat == 1)
{
chan->sampcnt = (double)chan->loopstart; // Is this correct?
chan->sampcnt = (double)(chan->loopstart << 3); // Is this correct?
chan->pcm16b = (s16)((chan->buf8[1] << 8) | chan->buf8[0]);
chan->index = chan->buf8[2] & 0x7F;
chan->lastsampcnt = 7;