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pico, fix psg sound and fast forward

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kub 2022-10-14 18:47:20 +00:00
parent c9d5f41b0a
commit e44c606f39
2 changed files with 22 additions and 20 deletions
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20
pico/pico/xpcm.c
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@ -77,18 +77,20 @@ PICO_INTERNAL void PicoPicoPCMUpdate(short *buffer, int length, int stereo)
srcval = *src >> 4;
do_sample();
for (needsamples += stepsamples; needsamples > (1<<10) && length > 0; needsamples -= (1<<10), length--) {
*buffer++ += sample;
if (stereo) { buffer[0] = buffer[-1]; buffer++; }
}
if (buffer)
for (needsamples += stepsamples; needsamples > (1<<10) && length > 0; needsamples -= (1<<10), length--) {
*buffer++ += sample;
if (stereo) { buffer[0] = buffer[-1]; buffer++; }
}
srcval = *src & 0xf;
do_sample();
for (needsamples += stepsamples; needsamples > (1<<10) && length > 0; needsamples -= (1<<10), length--) {
*buffer++ += sample;
if (stereo) { buffer[0] = buffer[-1]; buffer++; }
}
if (buffer)
for (needsamples += stepsamples; needsamples > (1<<10) && length > 0; needsamples -= (1<<10), length--) {
*buffer++ += sample;
if (stereo) { buffer[0] = buffer[-1]; buffer++; }
}
// lame normalization stuff, needed due to wrong adpcm algo
sgn += (sample < 0) ? -1 : 1;
@ -109,7 +111,7 @@ PICO_INTERNAL void PicoPicoPCMUpdate(short *buffer, int length, int stereo)
PicoPicohw.xpcm_ptr = PicoPicohw.xpcm_buffer;
end:
if (stereo)
if (buffer && stereo)
// still must expand SN76496 to stereo
for (; length > 0; buffer+=2, length--)
buffer[1] = buffer[0];