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GBA Audio: Fix sample timing drifting when changing sample interval

This commit is contained in:
Vicki Pfau 2023-06-19 22:32:27 -07:00
parent c358f22403
commit 1c41e1e051
2 changed files with 8 additions and 2 deletions
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1
CHANGES
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@ -11,6 +11,7 @@ Emulation fixes:
- GB Serialize: Add missing Pocket Cam state to savestates
- GB SIO: Disabling SIO should cancel pending transfers (fixes mgba.io/i/2537)
- GB Video: Implement DMG-style sprite ordering
- GBA Audio: Fix sample timing drifting when changing sample interval
- GBA BIOS: Fix clobbering registers with word-sized CpuSet
- GBA Video: Disable BG target 1 blending when OBJ blending (fixes mgba.io/i/2722)
Other fixes:

9
src/gba/audio.c
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@ -253,11 +253,16 @@ void GBAAudioWriteSOUNDCNT_X(struct GBAAudio* audio, uint16_t value) {
}
void GBAAudioWriteSOUNDBIAS(struct GBAAudio* audio, uint16_t value) {
GBAAudioSample(audio, mTimingCurrentTime(&audio->p->timing));
audio->soundbias = value;
int32_t oldSampleInterval = audio->sampleInterval;
audio->sampleInterval = 0x200 >> GBARegisterSOUNDBIASGetResolution(value);
if (oldSampleInterval != audio->sampleInterval && audio->p->stream && audio->p->stream->audioRateChanged) {
audio->p->stream->audioRateChanged(audio->p->stream, GBA_ARM7TDMI_FREQUENCY / audio->sampleInterval);
if (oldSampleInterval != audio->sampleInterval) {
audio->lastSample += oldSampleInterval * audio->sampleIndex;
audio->sampleIndex = 0;
if (audio->p->stream && audio->p->stream->audioRateChanged) {
audio->p->stream->audioRateChanged(audio->p->stream, GBA_ARM7TDMI_FREQUENCY / audio->sampleInterval);
}
}
}