mirror of
https://github.com/RaySollium99/picodrive.git
synced 2025-09-04 23:07:46 -04:00
129 lines
3.2 KiB
C
129 lines
3.2 KiB
C
#include "940shared.h"
|
|
|
|
static _940_data_t *shared_data = (_940_data_t *) 0x00100000;
|
|
static _940_ctl_t *shared_ctl = (_940_ctl_t *) 0x00200000;
|
|
static unsigned char *mp3_data = (unsigned char *) 0x01000000;
|
|
YM2612 *ym2612_940;
|
|
|
|
// from init.s
|
|
int wait_get_job(int oldjob);
|
|
void spend_cycles(int c);
|
|
void dcache_clean(void);
|
|
void dcache_clean_flush(void);
|
|
void drain_wb(void);
|
|
// this should help to resolve race confition where shared var
|
|
// is changed by other core just before we update it
|
|
void set_if_not_changed(int *val, int oldval, int newval);
|
|
|
|
// asm volatile ("mov r0, #0" ::: "r0");
|
|
// asm volatile ("mcr p15, 0, r0, c7, c6, 0" ::: "r0"); /* flush dcache */
|
|
// asm volatile ("mcr p15, 0, r0, c7, c10, 4" ::: "r0"); /* drain write buffer */
|
|
|
|
|
|
static void mp3_decode(void)
|
|
{
|
|
int mp3_offs = shared_ctl->mp3_offs;
|
|
unsigned char *readPtr = mp3_data + mp3_offs;
|
|
int bytesLeft = shared_ctl->mp3_len - mp3_offs;
|
|
int offset; // frame offset from readPtr
|
|
int err;
|
|
|
|
if (bytesLeft <= 0) return; // EOF, nothing to do
|
|
|
|
offset = MP3FindSyncWord(readPtr, bytesLeft);
|
|
if (offset < 0) {
|
|
set_if_not_changed(&shared_ctl->mp3_offs, mp3_offs, shared_ctl->mp3_len);
|
|
return; // EOF
|
|
}
|
|
readPtr += offset;
|
|
bytesLeft -= offset;
|
|
|
|
err = MP3Decode(shared_data->mp3dec, &readPtr, &bytesLeft,
|
|
shared_data->mp3_buffer[shared_ctl->mp3_buffsel], 0);
|
|
if (err) {
|
|
if (err == ERR_MP3_INDATA_UNDERFLOW) {
|
|
set_if_not_changed(&shared_ctl->mp3_offs, mp3_offs, shared_ctl->mp3_len);
|
|
return;
|
|
} else if (err <= -6 && err >= -12) {
|
|
// ERR_MP3_INVALID_FRAMEHEADER, ERR_MP3_INVALID_*
|
|
// just try to skip the offending frame..
|
|
readPtr++;
|
|
}
|
|
shared_ctl->mp3_errors++;
|
|
shared_ctl->mp3_lasterr = err;
|
|
}
|
|
set_if_not_changed(&shared_ctl->mp3_offs, mp3_offs, readPtr - mp3_data);
|
|
}
|
|
|
|
|
|
void Main940(void)
|
|
{
|
|
int *ym_buffer = shared_data->ym_buffer;
|
|
int job = 0;
|
|
ym2612_940 = &shared_data->ym2612;
|
|
|
|
|
|
for (;;)
|
|
{
|
|
job = wait_get_job(job);
|
|
|
|
shared_ctl->lastjob = job;
|
|
|
|
switch (job)
|
|
{
|
|
case JOB940_INITALL:
|
|
/* ym2612 */
|
|
shared_ctl->writebuff0[0] = shared_ctl->writebuff1[0] = 0xffff;
|
|
YM2612Init_(shared_ctl->baseclock, shared_ctl->rate);
|
|
/* Helix mp3 decoder */
|
|
shared_data->mp3dec = MP3InitDecoder();
|
|
break;
|
|
|
|
case JOB940_INVALIDATE_DCACHE:
|
|
drain_wb();
|
|
dcache_clean_flush();
|
|
break;
|
|
|
|
case JOB940_YM2612RESETCHIP:
|
|
YM2612ResetChip_();
|
|
break;
|
|
|
|
case JOB940_PICOSTATELOAD:
|
|
YM2612PicoStateLoad_();
|
|
break;
|
|
|
|
case JOB940_YM2612UPDATEONE: {
|
|
int i, dw, *wbuff;
|
|
if (shared_ctl->writebuffsel == 1) {
|
|
wbuff = (int *) shared_ctl->writebuff1;
|
|
} else {
|
|
wbuff = (int *) shared_ctl->writebuff0;
|
|
}
|
|
|
|
/* playback all writes */
|
|
for (i = 2048/2; i > 0; i--) {
|
|
UINT16 d;
|
|
dw = *wbuff++;
|
|
d = dw;
|
|
if (d == 0xffff) break;
|
|
YM2612Write_(d >> 8, d);
|
|
d = (dw>>16);
|
|
if (d == 0xffff) break;
|
|
YM2612Write_(d >> 8, d);
|
|
}
|
|
|
|
shared_ctl->ym_active_chs =
|
|
YM2612UpdateOne_(ym_buffer, shared_ctl->length, shared_ctl->stereo, 1);
|
|
break;
|
|
}
|
|
|
|
case JOB940_MP3DECODE:
|
|
mp3_decode();
|
|
break;
|
|
}
|
|
|
|
shared_ctl->loopc++;
|
|
dcache_clean();
|
|
}
|
|
}
|
|
|