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GB Audio: Channel 4 fixes (fixes #1265, closes #1289)

This commit is contained in:
Vicki Pfau 2019-09-14 13:08:34 -07:00
parent 4dd6a2930a
commit e7a02176e1
2 changed files with 9 additions and 7 deletions
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2
CHANGES
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@ -8,6 +8,8 @@ Emulation fixes:
- GBA Memory: Fix STM/LDM to invalid VRAM
- GB: Fix savedata initialization (fixes mgba.io/i/1473, mgba.io/i/1478)
- GB Printer: Reset printer buffer index after printing
- GBA Audio: Fix channel 4 aliasing (fixes mgba.io/i/1265)
- GB Audio: Improve channel 4 supersampling
Other fixes:
- Switch: Fix threading-related crash on second launch
- Qt: Fix FPS target maxing out at 59.727 (fixes mgba.io/i/1421)

14
src/gb/audio.c
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@ -37,7 +37,7 @@ static bool _updateSweep(struct GBAudioSquareChannel* sweep, bool initial);
static void _updateSquareSample(struct GBAudioSquareChannel* ch);
static int32_t _updateSquareChannel(struct GBAudioSquareChannel* ch);
static int8_t _coalesceNoiseChannel(struct GBAudioNoiseChannel* ch);
static int16_t _coalesceNoiseChannel(struct GBAudioNoiseChannel* ch);
static void _updateFrame(struct mTiming* timing, void* user, uint32_t cyclesLate);
static void _updateChannel1(struct mTiming* timing, void* user, uint32_t cyclesLate);
@ -630,8 +630,11 @@ void GBAudioSamplePSG(struct GBAudio* audio, int16_t* left, int16_t* right) {
}
}
sampleLeft <<= 3;
sampleRight <<= 3;
if (audio->playingCh4 && !audio->forceDisableCh[3]) {
int8_t sample = _coalesceNoiseChannel(&audio->ch4);
int16_t sample = audio->style == GB_AUDIO_GBA ? (audio->ch4.sample << 3) : _coalesceNoiseChannel(&audio->ch4);
if (audio->ch4Left) {
sampleLeft += sample;
}
@ -641,9 +644,6 @@ void GBAudioSamplePSG(struct GBAudio* audio, int16_t* left, int16_t* right) {
}
}
sampleLeft <<= 3;
sampleRight <<= 3;
*left = sampleLeft * (1 + audio->volumeLeft);
*right = sampleRight * (1 + audio->volumeRight);
}
@ -766,12 +766,12 @@ static int32_t _updateSquareChannel(struct GBAudioSquareChannel* ch) {
}
}
static int8_t _coalesceNoiseChannel(struct GBAudioNoiseChannel* ch) {
static int16_t _coalesceNoiseChannel(struct GBAudioNoiseChannel* ch) {
if (!ch->nSamples) {
return ch->sample;
}
// TODO keep track of timing
int8_t sample = ch->samples / ch->nSamples;
int16_t sample = (ch->samples << 3) / ch->nSamples;
ch->nSamples = 0;
ch->samples = 0;
return sample;