static Int32* ym2151Sync(void* ref, UInt32 count)
{
YM2151* ym2151 = (YM2151*)ref;
UInt32 i;
for (i = 0; i < count; i++) {
Int16 sl, sr;
ym2151->off -= SAMPLERATE - AUDIO_SAMPLERATE;
ym2151->s1l = ym2151->s2l;
ym2151->s1r = ym2151->s2r;
YM2151UpdateOne(ym2151->opl, &sl, &sr, 1);
ym2151->s2l = sl;
ym2151->s2r = sr;
if (ym2151->off < 0) {
ym2151->off += AUDIO_SAMPLERATE;
ym2151->s1l = ym2151->s2l;
ym2151->s1r = ym2151->s2r;
YM2151UpdateOne(ym2151->opl, &sl, &sr, 1);
ym2151->s2l = sl;
ym2151->s2r = sr;
}
ym2151->buffer[2*i+0] = 11*(Int32)((ym2151->s1l * (ym2151->off / 256) + ym2151->s2l * ((SAMPLERATE - ym2151->off) / 256)) / (SAMPLERATE / 256));
ym2151->buffer[2*i+1] = 11*(Int32)((ym2151->s1r * (ym2151->off / 256) + ym2151->s2r * ((SAMPLERATE - ym2151->off) / 256)) / (SAMPLERATE / 256));
}
return ym2151->buffer;
}
static void YM2151RenderNormal(INT16* pSoundBuf, INT32 nSegmentLength)
{
#if defined FBA_DEBUG
if (!DebugSnd_YM2151Initted) bprintf(PRINT_ERROR, _T("YM2151RenderNormal called without init\n"));
#endif
nBurnPosition += nSegmentLength;
pYM2151Buffer[0] = pBuffer;
pYM2151Buffer[1] = pBuffer + nSegmentLength;
YM2151UpdateOne(0, pYM2151Buffer, nSegmentLength);
for (INT32 n = 0; n < nSegmentLength; n++) {
INT32 nLeftSample = 0, nRightSample = 0;
if ((YM2151RouteDirs[BURN_SND_YM2151_YM2151_ROUTE_1] & BURN_SND_ROUTE_LEFT) == BURN_SND_ROUTE_LEFT) {
nLeftSample += (INT32)(pYM2151Buffer[0][n] * YM2151Volumes[BURN_SND_YM2151_YM2151_ROUTE_1]);
}
if ((YM2151RouteDirs[BURN_SND_YM2151_YM2151_ROUTE_1] & BURN_SND_ROUTE_RIGHT) == BURN_SND_ROUTE_RIGHT) {
nRightSample += (INT32)(pYM2151Buffer[0][n] * YM2151Volumes[BURN_SND_YM2151_YM2151_ROUTE_1]);
}
if ((YM2151RouteDirs[BURN_SND_YM2151_YM2151_ROUTE_2] & BURN_SND_ROUTE_LEFT) == BURN_SND_ROUTE_LEFT) {
nLeftSample += (INT32)(pYM2151Buffer[1][n] * YM2151Volumes[BURN_SND_YM2151_YM2151_ROUTE_2]);
}
if ((YM2151RouteDirs[BURN_SND_YM2151_YM2151_ROUTE_2] & BURN_SND_ROUTE_RIGHT) == BURN_SND_ROUTE_RIGHT) {
nRightSample += (INT32)(pYM2151Buffer[1][n] * YM2151Volumes[BURN_SND_YM2151_YM2151_ROUTE_2]);
}
nLeftSample = BURN_SND_CLIP(nLeftSample);
nRightSample = BURN_SND_CLIP(nRightSample);
pSoundBuf[(n << 1) + 0] = nLeftSample;
pSoundBuf[(n << 1) + 1] = nRightSample;
}
}
static void ym2151_update(void *param, stream_sample_t **inputs, stream_sample_t **buffers, int length)
{
struct ym2151_info *info = param;
YM2151UpdateOne(info->chip, buffers, length);
}