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Fixed DMADAC wrapping behavior. [Tim Schuerewegen]

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This commit is contained in:
Aaron Giles 2009-12-09 15:40:16 +00:00
parent e349350227
commit a0375128a0
1 changed files with 7 additions and 3 deletions
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10
src/emu/sound/dmadac.c
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@ -83,14 +83,17 @@ static STREAM_UPDATE( dmadac_update )
/* feed as much as we can */ /* feed as much as we can */
while (curout != curin && samples-- > 0) while (curout != curin && samples-- > 0)
*output++ = (source[curout++ % BUFFER_SIZE] * volume) >> 8; {
*output++ = (source[curout] * volume) >> 8;
curout = (curout + 1) % BUFFER_SIZE;
}
/* fill the rest with silence */ /* fill the rest with silence */
while (samples-- > 0) while (samples-- > 0)
*output++ = 0; *output++ = 0;
/* save the new output pointer */ /* save the new output pointer */
ch->bufout = curout % BUFFER_SIZE; ch->bufout = curout;
} }
@ -155,7 +158,8 @@ void dmadac_transfer(const device_config **devlist, UINT8 num_channels, offs_t c
/* copy the data */ /* copy the data */
for (j = 0; j < total_frames && curin != maxin; j++) for (j = 0; j < total_frames && curin != maxin; j++)
{ {
ch->buffer[curin++ % BUFFER_SIZE] = *src; ch->buffer[curin] = *src;
curin = (curin + 1) % BUFFER_SIZE;
src += frame_spacing; src += frame_spacing;
} }
ch->bufin = curin; ch->bufin = curin;