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Fix sampling order of sound channel 3

This commit is contained in:
Jeffrey Pfau 2014-07-09 03:52:58 -07:00
parent 3e827c24a8
commit c3136b914e
1 changed files with 7 additions and 5 deletions
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12
src/gba/gba-audio.c
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@ -563,15 +563,17 @@ static int32_t _updateChannel3(struct GBAAudioChannel3* ch) {
start = 3; start = 3;
end = 0; end = 0;
} }
uint32_t bitsCarry = ch->wavedata[end] & 0xF0000000; uint32_t bitsCarry = ch->wavedata[end] & 0x0F000000;
uint32_t bits; uint32_t bits;
for (i = start; i >= end; --i) { for (i = start; i >= end; --i) {
bits = ch->wavedata[i] & 0xF0000000; bits = ch->wavedata[i] & 0x0F000000;
ch->wavedata[i] <<= 4; ch->wavedata[i] = ((ch->wavedata[i] & 0xF0F0F0F0) >> 4) | ((ch->wavedata[i] & 0x000F0F0F) << 12);
ch->wavedata[i] |= bitsCarry >> 28; ch->wavedata[i] |= bitsCarry >> 20;
bitsCarry = bits; bitsCarry = bits;
} }
ch->sample = ((bitsCarry >> 26) - 0x20) * volume; ch->sample = (bitsCarry >> 20);
ch->sample >>= 2;
ch->sample *= volume;
return 8 * (2048 - ch->control.rate); return 8 * (2048 - ch->control.rate);
} }