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stream.h, replace hacky rate change with proper fix

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This commit is contained in:
dinkc64 2024-10-01 09:19:55 -04:00
parent 94dc5c01c4
commit 06b24bbe17
3 changed files with 14 additions and 10 deletions
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2
src/burn/drv/pre90s/d_berzerk.cpp
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@ -957,7 +957,7 @@ static UINT8 __fastcall berzerk_read_port(UINT16 address)
switch (address & 0xff)
{
case 0x44: bprintf(0, _T("is busy? %x\n"), s14001a_busy_read());
case 0x44:
return (s14001a_busy_read()) ? 0x00 : 0x40;
case 0x48: // p1

2
src/burn/snd/s14001a.cpp
View File

@ -386,7 +386,7 @@ void s14001a_start_write(INT32 state)
void s14001a_set_clock(INT32 clock)
{
chip.clock = clock;
stream.set_rate(clock, 1);
stream.set_rate(clock);
}
void s14001a_set_volume(double volume)

20
src/burn/snd/stream.h
View File

@ -42,6 +42,8 @@ struct Stream {
#define MAX_CHANNELS 8
INT32 nChannels;
bool bAddStream;
bool bRateChange;
UINT32 nNewRate;
INT16 *in_buffer[MAX_CHANNELS]; // resampler in-buffers
INT32 out_buffer_size;
@ -52,20 +54,18 @@ struct Stream {
nSampleRateFrom = rate_from;
nSampleRateTo = rate_to;
nChannels = channels;
set_rate(rate_from);
set_rate_internal(rate_from);
stream_init(update_stream);
}
void set_rate(INT32 rate_from, INT32 reposit_last_rate = 0) {
if (reposit_last_rate) {
// hack: if rate changes multiple times/frame, approximate new stream position
nPosition = nPosition * rate_from / nSampleRateFrom;
}
void set_rate(INT32 rate_from) {
bRateChange = true;
nNewRate = rate_from;
}
void set_rate_internal(INT32 rate_from) {
nSampleRateFrom = rate_from;
nSampleSize = (UINT64)nSampleRateFrom * (1 << 16) / ((nSampleRateTo == 0) ? 44100 : nSampleRateTo);
nSampleSize_Otherway = (UINT64)((nSampleRateTo == 0) ? 44100 : nSampleRateTo) * (1 << 16) / ((nSampleRateFrom == 0) ? 44100 : nSampleRateFrom);
// origially this restarted the frame (nPosition = 0), but this breaks
// qbert, as the game writes rate changes several times per frame.
}
void exit() {
nSampleSize = nFractionalPosition = 0;
@ -116,6 +116,10 @@ struct Stream {
// mask off the whole samples from our accumulator
nFractionalPosition &= 0xffff;
if (bRateChange) {
set_rate_internal(nNewRate);
bRateChange = false;
}
}
void samplesample(INT16 *out_buffer, INT32 samples) {
for (INT32 i = 0; i < samples; i++, out_buffer += 2, nFractionalPosition += nSampleSize) {