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code940 now plays mp3s

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git-svn-id: file:///home/notaz/opt/svn/PicoDrive@22 be3aeb3a-fb24-0410-a615-afba39da0efa
This commit is contained in:
notaz 2007-01-20 23:11:02 +00:00
parent b837b69b3f
commit 42c7b14797
26 changed files with 1061 additions and 75 deletions
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134
platform/gp2x/code940/940.c Normal file
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#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;
int *mix_buffer;
// from init.s
void wait_irq(void);
void spend_cycles(int c);
void cache_clean(void);
void cache_clean_flush(void);
// 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 */
void Main940(int startvector)
{
ym2612_940 = &shared_data->ym2612;
mix_buffer = shared_data->mix_buffer;
// debug
shared_ctl->vstarts[startvector]++;
// asm volatile ("mcr p15, 0, r0, c7, c10, 4" ::: "r0");
for (;;)
{
int job_num = 0;
/*
while (!shared_ctl->busy)
{
//shared_ctl->waitc++;
spend_cycles(8*1024);
}
*/
if (!shared_ctl->busy)
{
wait_irq();
}
for (job_num = 0; job_num < MAX_940JOBS; job_num++)
{
switch (shared_ctl->jobs[job_num])
{
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_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);
}
YM2612UpdateOne_(0, shared_ctl->length, shared_ctl->stereo);
break;
}
case JOB940_MP3DECODE: {
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) break; // EOF, nothing to do
offset = MP3FindSyncWord(readPtr, bytesLeft);
if (offset < 0) {
shared_ctl->mp3_offs = shared_ctl->mp3_len;
break; // 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) {
shared_ctl->mp3_offs = shared_ctl->mp3_len; // EOF
break;
} 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;
}
shared_ctl->mp3_offs = readPtr - mp3_data;
break;
}
}
}
cache_clean();
// asm volatile ("mov r0, #0" ::: "r0");
// asm volatile ("mcr p15, 0, r0, c7, c10, 4" ::: "r0"); /* drain write buffer, should be done on nonbuffered write */
// cache_clean_flush();
shared_ctl->loopc++;
shared_ctl->busy = 0;
}
}