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sound fixes for Ferrari GP

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git-svn-id: file:///home/notaz/opt/svn/PicoDrive@247 be3aeb3a-fb24-0410-a615-afba39da0efa
This commit is contained in:
notaz 2007-09-14 17:52:42 +00:00
parent e849512f15
commit 5f8c85be2a
4 changed files with 39 additions and 19 deletions
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9
Pico/sound/sound.c
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@ -117,7 +117,7 @@ PICO_INTERNAL void sound_reset(void)
// to be called after changing sound rate or chips
void sound_rerate(int preserve_state)
{
unsigned int state[28];
void *state = NULL;
int target_fps = Pico.m.pal ? 50 : 60;
// not all rates are supported in MCD mode due to mp3 decoder limitations
@ -127,12 +127,16 @@ void sound_rerate(int preserve_state)
}
if (preserve_state) {
state = malloc(0x200);
if (state == NULL) return;
memcpy(state, YM2612GetRegs(), 0x200);
if ((PicoMCD & 1) && Pico_mcd->m.audio_track)
Pico_mcd->m.audio_offset = mp3_get_offset();
}
YM2612Init(Pico.m.pal ? OSC_PAL/7 : OSC_NTSC/7, PsndRate);
if (preserve_state) {
// feed it back it's own registers, just like after loading state
memcpy(YM2612GetRegs(), state, 0x200);
YM2612PicoStateLoad();
if ((PicoMCD & 1) && Pico_mcd->m.audio_track)
mp3_start_play(Pico_mcd->TOC.Tracks[Pico_mcd->m.audio_track].F, Pico_mcd->m.audio_offset);
@ -142,6 +146,9 @@ void sound_rerate(int preserve_state)
SN76496_init(Pico.m.pal ? OSC_PAL/15 : OSC_NTSC/15, PsndRate);
if (preserve_state) memcpy(sn76496_regs, state, 28*4); // restore old state
if (state)
free(state);
// calculate PsndLen
PsndLen=PsndRate / target_fps;
PsndLen_exc_add=((PsndRate - PsndLen*target_fps)<<16) / target_fps;