[libpicofe.git] / gp2x / 940ctl.c

#include <stdio.h>\r
#include <stdlib.h>\r
#include <string.h>\r
#include <unistd.h>\r
#include <sys/mman.h>\r
#include <sys/ioctl.h>\r
#include <fcntl.h>\r
#include <errno.h>\r
\r
#include "code940/940shared.h"\r
#include "gp2x.h"\r
#include "emu.h"\r
#include "menu.h"\r
#include "asmutils.h"\r
#include "mp3.h"\r
#include "../../Pico/PicoInt.h"\r
#include "../../Pico/sound/mix.h"\r
\r
/* we will need some gp2x internals here */\r
extern volatile unsigned short *gp2x_memregs; /* from minimal library rlyeh */\r
extern volatile unsigned long  *gp2x_memregl;\r
\r
static unsigned char *shared_mem = 0;\r
static _940_data_t *shared_data = 0;\r
_940_ctl_t *shared_ctl = 0;\r
unsigned char *mp3_mem = 0;\r
\r
#define MP3_SIZE_MAX (0x1000000 - 4*640*480)\r
\r
int crashed_940 = 0;\r
\r
static FILE *loaded_mp3 = 0;\r
\r
/***********************************************************/\r
\r
#define MAXOUT		(+32767)\r
#define MINOUT		(-32768)\r
\r
/* limitter */\r
#define Limit(val, max,min) { \\r
	if ( val > max )      val = max; \\r
	else if ( val < min ) val = min; \\r
}\r
\r
/* these will be managed locally on our side */\r
extern int   *ym2612_dacen;\r
extern INT32 *ym2612_dacout;\r
extern void  *ym2612_regs;\r
\r
static UINT8 *REGS = 0;		/* we will also keep local copy of regs for savestates and such */\r
static INT32 addr_A1;		/* address line A1      */\r
static int	 dacen;\r
static INT32 dacout;\r
static UINT8 ST_address;	/* address register     */\r
static UINT8 ST_status;		/* status flag          */\r
static UINT8 ST_mode;		/* mode  CSM / 3SLOT    */\r
static int   ST_TA;			/* timer a              */\r
static int   ST_TAC;		/* timer a maxval       */\r
static int   ST_TAT;		/* timer a ticker       */\r
static UINT8 ST_TB;			/* timer b              */\r
static int   ST_TBC;		/* timer b maxval       */\r
static int   ST_TBT;		/* timer b ticker       */\r
\r
static int   writebuff_ptr = 0;\r
\r
\r
/* OPN Mode Register Write */\r
static void set_timers( int v )\r
{\r
	/* b7 = CSM MODE */\r
	/* b6 = 3 slot mode */\r
	/* b5 = reset b */\r
	/* b4 = reset a */\r
	/* b3 = timer enable b */\r
	/* b2 = timer enable a */\r
	/* b1 = load b */\r
	/* b0 = load a */\r
	ST_mode = v;\r
\r
	/* reset Timer b flag */\r
	if( v & 0x20 )\r
		ST_status &= ~2;\r
\r
	/* reset Timer a flag */\r
	if( v & 0x10 )\r
		ST_status &= ~1;\r
}\r
\r
/* YM2612 write */\r
/* a = address */\r
/* v = value   */\r
/* returns 1 if sample affecting state changed */\r
int YM2612Write_940(unsigned int a, unsigned int v)\r
{\r
	int addr; //, ret=1;\r
\r
	v &= 0xff;	/* adjust to 8 bit bus */\r
	a &= 3;\r
\r
	switch( a ) {\r
	case 0:	/* address port 0 */\r
		ST_address = v;\r
		addr_A1 = 0;\r
		//ret=0;\r
		break;\r
\r
	case 1:	/* data port 0    */\r
		if (addr_A1 != 0) {\r
			return 0;	/* verified on real YM2608 */\r
		}\r
\r
		addr = ST_address;\r
		REGS[addr] = v;\r
\r
		switch( addr & 0xf0 )\r
		{\r
		case 0x20:	/* 0x20-0x2f Mode */\r
			switch( addr )\r
			{\r
			case 0x24: { // timer A High 8\r
					int TAnew = (ST_TA & 0x03)|(((int)v)<<2);\r
					if(ST_TA != TAnew) {\r
						// we should reset ticker only if new value is written. Outrun requires this.\r
						ST_TA = TAnew;\r
						ST_TAC = (1024-TAnew)*18;\r
						ST_TAT = 0;\r
					}\r
					return 0;\r
				}\r
			case 0x25: { // timer A Low 2\r
					int TAnew = (ST_TA & 0x3fc)|(v&3);\r
					if(ST_TA != TAnew) {\r
						ST_TA = TAnew;\r
						ST_TAC = (1024-TAnew)*18;\r
						ST_TAT = 0;\r
					}\r
					return 0;\r
				}\r
			case 0x26: // timer B\r
				if(ST_TB != v) {\r
					ST_TB = v;\r
					ST_TBC  = (256-v)<<4;\r
					ST_TBC *= 18;\r
					ST_TBT  = 0;\r
				}\r
				return 0;\r
			case 0x27:	/* mode, timer control */\r
				set_timers( v );\r
				break; // other side needs ST.mode for 3slot mode\r
			case 0x2a:	/* DAC data (YM2612) */\r
				dacout = ((int)v - 0x80) << 6;	/* level unknown (notaz: 8 seems to be too much) */\r
				return 0;\r
			case 0x2b:	/* DAC Sel  (YM2612) */\r
				/* b7 = dac enable */\r
				dacen = v & 0x80;\r
				break; // other side has to know this\r
			default:\r
				break;\r
			}\r
			break;\r
		}\r
		break;\r
\r
	case 2:	/* address port 1 */\r
		ST_address = v;\r
		addr_A1 = 1;\r
		//ret=0;\r
		break;\r
\r
	case 3:	/* data port 1    */\r
		if (addr_A1 != 1) {\r
			return 0;	/* verified on real YM2608 */\r
		}\r
\r
		addr = ST_address | 0x100;\r
		REGS[addr] = v;\r
		break;\r
	}\r
\r
	if(currentConfig.EmuOpt & 4) {\r
		/* queue this write for 940 */\r
		if (writebuff_ptr < 2047) {\r
			if (shared_ctl->writebuffsel == 1) {\r
				shared_ctl->writebuff0[writebuff_ptr++] = (a<<8)|v;\r
			} else {\r
				shared_ctl->writebuff1[writebuff_ptr++] = (a<<8)|v;\r
			}\r
		} else {\r
			printf("warning: writebuff_ptr > 2047\n");\r
		}\r
	}\r
\r
	return 0; // cause the engine to do updates once per frame only\r
}\r
\r
UINT8 YM2612Read_940(void)\r
{\r
	return ST_status;\r
}\r
\r
\r
int YM2612PicoTick_940(int n)\r
{\r
	//int ret = 0;\r
\r
	// timer A\r
	if(ST_mode & 0x01 && (ST_TAT+=64*n) >= ST_TAC) {\r
		ST_TAT -= ST_TAC;\r
		if(ST_mode & 0x04) ST_status |= 1;\r
		// CSM mode total level latch and auto key on\r
/*		FIXME\r
		if(ST_mode & 0x80) {\r
			CSMKeyControll( &(ym2612_940->CH[2]) ); // Vectorman2, etc.\r
			ret = 1;\r
		}\r
*/\r
	}\r
\r
	// timer B\r
	if(ST_mode & 0x02 && (ST_TBT+=64*n) >= ST_TBC) {\r
		ST_TBT -= ST_TBC;\r
		if(ST_mode & 0x08) ST_status |= 2;\r
	}\r
\r
	return 0;\r
}\r
\r
\r
#define CHECK_BUSY(job) \\r
	(gp2x_memregs[0x3b46>>1] & (1<<(job-1)))\r
\r
static void wait_busy_940(int job)\r
{\r
	int i;\r
\r
	job--;\r
	for (i = 0; (gp2x_memregs[0x3b46>>1] & (1<<job)) && i < 0x10000; i++)\r
		spend_cycles(8*1024); // tested to be best for mp3 dec\r
	if (i < 0x10000) return;\r
\r
	/* 940 crashed */\r
	printf("940 crashed (cnt: %i, ve: ", shared_ctl->loopc);\r
	for (i = 0; i < 8; i++)\r
		printf("%i ", shared_ctl->vstarts[i]);\r
	printf(")\n");\r
	printf("irq pending flags: DUALCPU %04x, SRCPND %08lx (see 26), INTPND %08lx\n",\r
		gp2x_memregs[0x3b46>>1], gp2x_memregl[0x4500>>2], gp2x_memregl[0x4510>>2]);\r
	printf("last lr: %08x, lastjob: %i\n", shared_ctl->last_lr, shared_ctl->lastjob);\r
	printf("trying to interrupt..\n");\r
	gp2x_memregs[0x3B3E>>1] = 0xffff;\r
	for (i = 0; gp2x_memregs[0x3b46>>1] && i < 0x10000; i++)\r
		spend_cycles(8*1024);\r
	printf("i = 0x%x\n", i);\r
	printf("irq pending flags: DUALCPU %04x, SRCPND %08lx (see 26), INTPND %08lx\n",\r
		gp2x_memregs[0x3b46>>1], gp2x_memregl[0x4500>>2], gp2x_memregl[0x4510>>2]);\r
	printf("last lr: %08x, lastjob: %i\n", shared_ctl->last_lr, shared_ctl->lastjob);\r
\r
	strcpy(menuErrorMsg, "940 crashed.");\r
	engineState = PGS_Menu;\r
	crashed_940 = 1;\r
}\r
\r
\r
static void add_job_940(int job)\r
{\r
	if (job <= 0 || job > 16) {\r
		printf("add_job_940: bad job: %i\n", job);\r
		return;\r
	}\r
\r
	// generate interrupt for this job\r
	job--;\r
	gp2x_memregs[(0x3B20+job*2)>>1] = 1;\r
\r
//	printf("added %i, pending %04x\n", job+1, gp2x_memregs[0x3b46>>1]);\r
}\r
\r
\r
void YM2612PicoStateLoad_940(void)\r
{\r
	int i, old_A1 = addr_A1;\r
\r
	// feed all the registers and update internal state\r
	for(i = 0; i < 0x100; i++) {\r
		YM2612Write_940(0, i);\r
		YM2612Write_940(1, REGS[i]);\r
	}\r
	for(i = 0; i < 0x100; i++) {\r
		YM2612Write_940(2, i);\r
		YM2612Write_940(3, REGS[i|0x100]);\r
	}\r
\r
	addr_A1 = old_A1;\r
\r
	add_job_940(JOB940_PICOSTATELOAD);\r
}\r
\r
\r
static void internal_reset(void)\r
{\r
	writebuff_ptr = 0;\r
	ST_mode   = 0;\r
	ST_status = 0;	/* normal mode */\r
	ST_TA     = 0;\r
	ST_TAC    = 0;\r
	ST_TB     = 0;\r
	ST_TBC    = 0;\r
	dacen = 0;\r
}\r
\r
\r
/* this must be called after mmu hack, the allocated regions must not get cached */\r
void sharedmem_init(void)\r
{\r
	if (shared_mem != NULL) return;\r
\r
	shared_mem = (unsigned char *) mmap(0, 0x210000, PROT_READ|PROT_WRITE, MAP_SHARED, memdev, 0x2000000);\r
	if(shared_mem == MAP_FAILED)\r
	{\r
		printf("mmap(shared_data) failed with %i\n", errno);\r
		exit(1);\r
	}\r
	shared_data = (_940_data_t *) (shared_mem+0x100000);\r
	/* this area must not get buffered on either side */\r
	shared_ctl =  (_940_ctl_t *)  (shared_mem+0x200000);\r
	mp3_mem = (unsigned char *) mmap(0, MP3_SIZE_MAX, PROT_READ|PROT_WRITE, MAP_SHARED, memdev, 0x3000000);\r
	if (mp3_mem == MAP_FAILED)\r
	{\r
		printf("mmap(mp3_mem) failed with %i\n", errno);\r
		exit(1);\r
	}\r
	crashed_940 = 1;\r
}\r
\r
\r
void sharedmem_deinit(void)\r
{\r
	munmap(shared_mem, 0x210000);\r
	munmap(mp3_mem, MP3_SIZE_MAX);\r
	shared_mem = mp3_mem = NULL;\r
	shared_data = NULL;\r
	shared_ctl = NULL;\r
}\r
\r
\r
extern char **g_argv;\r
\r
/* none of the functions in this file should be called before this one */\r
void YM2612Init_940(int baseclock, int rate)\r
{\r
	printf("YM2612Init_940()\n");\r
	printf("Mem usage: shared_data: %i, shared_ctl: %i\n", sizeof(*shared_data), sizeof(*shared_ctl));\r
\r
	Reset940(1, 2);\r
	Pause940(1);\r
\r
	gp2x_memregs[0x3B40>>1] = 0;      // disable DUALCPU interrupts for 920\r
	gp2x_memregs[0x3B42>>1] = 1;      // enable  DUALCPU interrupts for 940\r
\r
	gp2x_memregl[0x4504>>2] = 0;        // make sure no FIQs will be generated\r
	gp2x_memregl[0x4508>>2] = ~(1<<26); // unmask DUALCPU ints in the undocumented 940's interrupt controller\r
\r
\r
	if (crashed_940)\r
	{\r
		unsigned char ucData[1024];\r
		int nRead, i, nLen = 0;\r
		char binpath[1024];\r
		FILE *fp;\r
\r
		strncpy(binpath, g_argv[0], 1023);\r
		binpath[1023] = 0;\r
		for (i = strlen(binpath); i > 0; i--)\r
			if (binpath[i] == '/') { binpath[i] = 0; break; }\r
		strcat(binpath, "/code940.bin");\r
\r
		fp = fopen(binpath, "rb");\r
		if(!fp)\r
		{\r
			memset(gp2x_screen, 0, 320*240);\r
			gp2x_text_out8(10, 100, "failed to open required file:");\r
			gp2x_text_out8(10, 110, "code940.bin");\r
			gp2x_video_flip();\r
			printf("failed to open %s\n", binpath);\r
			exit(1);\r
		}\r
\r
		while(1)\r
		{\r
			nRead = fread(ucData, 1, 1024, fp);\r
			if(nRead <= 0)\r
				break;\r
			memcpy(shared_mem + nLen, ucData, nRead);\r
			nLen += nRead;\r
		}\r
		fclose(fp);\r
		crashed_940 = 0;\r
	}\r
\r
	memset(shared_data, 0, sizeof(*shared_data));\r
	memset(shared_ctl,  0, sizeof(*shared_ctl));\r
\r
	REGS = YM2612GetRegs();\r
\r
	ym2612_dacen  = &dacen;\r
	ym2612_dacout = &dacout;\r
\r
	internal_reset();\r
\r
	loaded_mp3 = 0;\r
\r
	gp2x_memregs[0x3B46>>1] = 0xffff; // clear pending DUALCPU interrupts for 940\r
	gp2x_memregl[0x4500>>2] = 0xffffffff; // clear pending IRQs in SRCPND\r
	gp2x_memregl[0x4510>>2] = 0xffffffff; // clear pending IRQs in INTPND\r
\r
	/* start the 940 */\r
	Reset940(0, 2);\r
	Pause940(0);\r
\r
	// YM2612ResetChip_940(); // will be done on JOB940_YM2612INIT\r
\r
	/* now cause 940 to init it's ym2612 stuff */\r
	shared_ctl->baseclock = baseclock;\r
	shared_ctl->rate = rate;\r
	add_job_940(JOB940_INITALL);\r
}\r
\r
\r
void YM2612ResetChip_940(void)\r
{\r
	printf("YM2612ResetChip_940()\n");\r
	if (shared_data == NULL) {\r
		printf("YM2612ResetChip_940: reset before init?\n");\r
		return;\r
	}\r
\r
	internal_reset();\r
\r
	add_job_940(JOB940_YM2612RESETCHIP);\r
}\r
\r
\r
int YM2612UpdateOne_940(int *buffer, int length, int stereo, int is_buf_empty)\r
{\r
	int *ym_buf = shared_data->ym_buffer;\r
	int ym_active_chs;\r
\r
	//printf("YM2612UpdateOne_940()\n");\r
\r
	if (CHECK_BUSY(JOB940_YM2612UPDATEONE)) wait_busy_940(JOB940_YM2612UPDATEONE);\r
\r
	ym_active_chs = shared_ctl->ym_active_chs;\r
\r
	// mix in ym buffer. is_buf_empty means nobody mixed there anything yet and it may contain trash\r
	if (is_buf_empty && ym_active_chs) memcpy32(buffer, ym_buf, length<<stereo);\r
	else memset32(buffer, 0, length<<stereo);\r
\r
	if (shared_ctl->writebuffsel == 1) {\r
		shared_ctl->writebuff0[writebuff_ptr] = 0xffff;\r
	} else {\r
		shared_ctl->writebuff1[writebuff_ptr] = 0xffff;\r
	}\r
	writebuff_ptr = 0;\r
\r
	/* predict sample counter for next frame */\r
	if (PsndLen_exc_add) {\r
		if (PsndLen_exc_cnt + PsndLen_exc_add >= 0x10000) length = PsndLen + 1;\r
		else length = PsndLen;\r
	}\r
\r
	/* give 940 ym job */\r
	shared_ctl->writebuffsel ^= 1;\r
	shared_ctl->length = length;\r
	shared_ctl->stereo = stereo;\r
\r
	add_job_940(JOB940_YM2612UPDATEONE);\r
\r
	return ym_active_chs;\r
}\r
\r
\r
static int mp3_samples_ready = 0, mp3_buffer_offs = 0;\r
static int mp3_play_bufsel = 0, mp3_job_started = 0;\r
\r
void mp3_update(int *buffer, int length, int stereo)\r
{\r
	int length_mp3;\r
	int cdda_on;\r
\r
	// not data track, CDC is reading, playback was started, track not ended\r
	cdda_on = !(Pico_mcd->s68k_regs[0x36] & 1) && (Pico_mcd->scd.Status_CDC & 1) &&\r
			loaded_mp3 && shared_ctl->mp3_offs < shared_ctl->mp3_len;\r
\r
	if (!cdda_on) return;\r
\r
	if (!(PicoOpt&0x200)) {\r
		mp3_update_local(buffer, length, stereo);\r
		return;\r
	}\r
\r
	length_mp3 = length;\r
	if (PsndRate == 22050) length_mp3 <<= 1;	// mp3s are locked to 44100Hz stereo\r
	else if (PsndRate == 11025) length_mp3 <<= 2;	// so make length 44100ish\r
\r
	/* do we have to wait? */\r
	if (mp3_job_started && mp3_samples_ready < length_mp3) {\r
		if (CHECK_BUSY(JOB940_MP3DECODE)) wait_busy_940(JOB940_MP3DECODE);\r
		mp3_job_started = 0;\r
		mp3_samples_ready += 1152;\r
	}\r
\r
	/* mix mp3 data, only stereo */\r
	if (mp3_samples_ready >= length_mp3)\r
	{\r
		int shr = 0;\r
		void (*mix_samples)(int *dest_buf, short *mp3_buf, int count) = mix_16h_to_32;\r
		if (PsndRate == 22050) { mix_samples = mix_16h_to_32_s1; shr = 1; }\r
		else if (PsndRate == 11025) { mix_samples = mix_16h_to_32_s2; shr = 2; }\r
\r
		if (1152 - mp3_buffer_offs >= length_mp3) {\r
			mix_samples(buffer, shared_data->mp3_buffer[mp3_play_bufsel] + mp3_buffer_offs*2, length<<1);\r
\r
			mp3_buffer_offs += length_mp3;\r
		} else {\r
			// collect samples from both buffers..\r
			int left = 1152 - mp3_buffer_offs;\r
			if (mp3_play_bufsel == 0)\r
			{\r
				mix_samples(buffer, shared_data->mp3_buffer[0] + mp3_buffer_offs*2, length<<1);\r
				mp3_buffer_offs = length_mp3 - left;\r
				mp3_play_bufsel = 1;\r
			} else {\r
				mix_samples(buffer, shared_data->mp3_buffer[1] + mp3_buffer_offs*2, (left>>shr)<<1);\r
				mp3_buffer_offs = length_mp3 - left;\r
				mix_samples(buffer + ((left>>shr)<<1),\r
					shared_data->mp3_buffer[0], (mp3_buffer_offs>>shr)<<1);\r
				mp3_play_bufsel = 0;\r
			}\r
		}\r
		mp3_samples_ready -= length_mp3;\r
	}\r
\r
	// ask to decode more if we already can\r
	if (!mp3_job_started)\r
	{\r
		mp3_job_started = 1;\r
		shared_ctl->mp3_buffsel ^= 1;\r
		add_job_940(JOB940_MP3DECODE);\r
	}\r
}\r
\r
\r
/***********************************************************/\r
\r
void mp3_start_play(FILE *f, int pos) // pos is 0-1023\r
{\r
	int byte_offs = 0;\r
\r
	if (!(PicoOpt&0x800)) { // cdda disabled?\r
		return;\r
	}\r
\r
	if (loaded_mp3 != f)\r
	{\r
		// printf("loading mp3... "); fflush(stdout);\r
		fseek(f, 0, SEEK_SET);\r
		fread(mp3_mem, 1, MP3_SIZE_MAX, f);\r
		// if (feof(f)) printf("done.\n");\r
		// else printf("done. mp3 too large, not all data loaded.\n");\r
		shared_ctl->mp3_len = ftell(f);\r
		loaded_mp3 = f;\r
\r
		if (PicoOpt&0x200) {\r
			// as we are going to change 940's cacheable area, we must invalidate it's cache..\r
			if (CHECK_BUSY(JOB940_MP3DECODE)) wait_busy_940(JOB940_MP3DECODE);\r
			add_job_940(JOB940_INVALIDATE_DCACHE);\r
		}\r
	}\r
\r
	// seek..\r
	if (pos) {\r
		byte_offs  = (shared_ctl->mp3_len << 6) >> 10;\r
		byte_offs *= pos;\r
		byte_offs >>= 6;\r
	}\r
	// printf("mp3 pos1024: %i, byte_offs %i/%i\n", pos, byte_offs, shared_ctl->mp3_len);\r
\r
	shared_ctl->mp3_offs = byte_offs;\r
\r
	// reset buffer pointers and stuff..\r
	mp3_samples_ready = mp3_buffer_offs = mp3_play_bufsel = 0;\r
	mp3_job_started = 0;\r
	shared_ctl->mp3_buffsel = 1; // will change to 0 on first decode\r
\r
	if (!(PicoOpt&0x200)) mp3_start_local();\r
}\r
\r
\r
int mp3_get_offset(void)\r
{\r
	int offs1024 = 0;\r
	int cdda_on;\r
\r
	cdda_on = (PicoMCD & 1) && (PicoOpt&0x800) && !(Pico_mcd->s68k_regs[0x36] & 1) &&\r
			(Pico_mcd->scd.Status_CDC & 1) && loaded_mp3;\r
\r
	if (cdda_on) {\r
		offs1024  = shared_ctl->mp3_offs << 7;\r
		offs1024 /= shared_ctl->mp3_len;\r
		offs1024 <<= 3;\r
	}\r
	printf("offs1024=%i (%i/%i)\n", offs1024, shared_ctl->mp3_offs, shared_ctl->mp3_len);\r
\r
	return offs1024;\r
}\r
\r
\r
Commit	Line	Data
720ee7f6	1	#include <stdio.h>\r
	2	#include <stdlib.h>\r
	3	#include <string.h>\r
	4	#include <unistd.h>\r
	5	#include <sys/mman.h>\r
	6	#include <sys/ioctl.h>\r
	7	#include <fcntl.h>\r
	8	#include <errno.h>\r
	9	\r
b30a8e67	10	#include "code940/940shared.h"\r
720ee7f6	11	#include "gp2x.h"\r
	12	#include "emu.h"\r
	13	#include "menu.h"\r
	14	#include "asmutils.h"\r
edbb82f8	15	#include "mp3.h"\r
598e7c06	16	#include "../../Pico/PicoInt.h"\r
49fe50f0	17	#include "../../Pico/sound/mix.h"\r
49fe50f0	18	\r
720ee7f6	19	/* we will need some gp2x internals here */\r
	20	extern volatile unsigned short gp2x_memregs; / from minimal library rlyeh */\r
	21	extern volatile unsigned long *gp2x_memregl;\r
	22	\r
	23	static unsigned char *shared_mem = 0;\r
	24	static _940_data_t *shared_data = 0;\r
edbb82f8	25	_940_ctl_t *shared_ctl = 0;\r
edbb82f8	26	unsigned char *mp3_mem = 0;\r
598e7c06	27	\r
598e7c06	28	#define MP3_SIZE_MAX (0x1000000 - 4640480)\r
720ee7f6	29	\r
	30	int crashed_940 = 0;\r
	31	\r
979ba09f	32	static FILE *loaded_mp3 = 0;\r
720ee7f6	33	\r
	34	/***********************************************************/\r
	35	\r
	36	#define MAXOUT (+32767)\r
	37	#define MINOUT (-32768)\r
	38	\r
	39	/* limitter */\r
	40	#define Limit(val, max,min) { \\r
	41	if ( val > max ) val = max; \\r
	42	else if ( val < min ) val = min; \\r
	43	}\r
	44	\r
	45	/* these will be managed locally on our side */\r
	46	extern int *ym2612_dacen;\r
	47	extern INT32 *ym2612_dacout;\r
	48	extern void *ym2612_regs;\r
	49	\r
	50	static UINT8 REGS = 0; / we will also keep local copy of regs for savestates and such */\r
	51	static INT32 addr_A1; /* address line A1 */\r
	52	static int dacen;\r
	53	static INT32 dacout;\r
	54	static UINT8 ST_address; /* address register */\r
	55	static UINT8 ST_status; /* status flag */\r
	56	static UINT8 ST_mode; /* mode CSM / 3SLOT */\r
	57	static int ST_TA; /* timer a */\r
	58	static int ST_TAC; /* timer a maxval */\r
	59	static int ST_TAT; /* timer a ticker */\r
	60	static UINT8 ST_TB; /* timer b */\r
	61	static int ST_TBC; /* timer b maxval */\r
	62	static int ST_TBT; /* timer b ticker */\r
	63	\r
	64	static int writebuff_ptr = 0;\r
	65	\r
	66	\r
	67	/* OPN Mode Register Write */\r
	68	static void set_timers( int v )\r
	69	{\r
	70	/* b7 = CSM MODE */\r
	71	/* b6 = 3 slot mode */\r
	72	/* b5 = reset b */\r
	73	/* b4 = reset a */\r
	74	/* b3 = timer enable b */\r
	75	/* b2 = timer enable a */\r
	76	/* b1 = load b */\r
	77	/* b0 = load a */\r
	78	ST_mode = v;\r
	79	\r
	80	/* reset Timer b flag */\r
	81	if( v & 0x20 )\r
	82	ST_status &= ~2;\r
	83	\r
	84	/* reset Timer a flag */\r
	85	if( v & 0x10 )\r
	86	ST_status &= ~1;\r
	87	}\r
	88	\r
	89	/* YM2612 write */\r
	90	/* a = address */\r
	91	/* v = value */\r
	92	/* returns 1 if sample affecting state changed */\r
	93	int YM2612Write_940(unsigned int a, unsigned int v)\r
	94	{\r
	95	int addr; //, ret=1;\r
	96	\r
97	v &= 0xff; /* adjust to 8 bit bus */\r
98	a &= 3;\r
99	\r
100	switch( a ) {\r
101	case 0: /* address port 0 */\r
102	ST_address = v;\r
103	addr_A1 = 0;\r
104	//ret=0;\r
105	break;\r
106	\r
107	case 1: /* data port 0 */\r
108	if (addr_A1 != 0) {\r
109	return 0; /* verified on real YM2608 */\r
110	}\r
111	\r
112	addr = ST_address;\r
113	REGS[addr] = v;\r
114	\r
115	switch( addr & 0xf0 )\r
116	{\r
117	case 0x20: /* 0x20-0x2f Mode */\r
118	switch( addr )\r
119	{\r
120	case 0x24: { // timer A High 8\r
121	int TAnew = (ST_TA & 0x03)\|(((int)v)<<2);\r
122	if(ST_TA != TAnew) {\r
123	// we should reset ticker only if new value is written. Outrun requires this.\r
124	ST_TA = TAnew;\r
125	ST_TAC = (1024-TAnew)*18;\r
126	ST_TAT = 0;\r
127	}\r
128	return 0;\r
129	}\r
130	case 0x25: { // timer A Low 2\r
131	int TAnew = (ST_TA & 0x3fc)\|(v&3);\r
132	if(ST_TA != TAnew) {\r
133	ST_TA = TAnew;\r
134	ST_TAC = (1024-TAnew)*18;\r
135	ST_TAT = 0;\r
136	}\r
137	return 0;\r
138	}\r
139	case 0x26: // timer B\r
140	if(ST_TB != v) {\r
141	ST_TB = v;\r
142	ST_TBC = (256-v)<<4;\r
143	ST_TBC *= 18;\r
144	ST_TBT = 0;\r
145	}\r
146	return 0;\r
147	case 0x27: /* mode, timer control */\r
148	set_timers( v );\r
149	break; // other side needs ST.mode for 3slot mode\r
150	case 0x2a: /* DAC data (YM2612) */\r
151	dacout = ((int)v - 0x80) << 6; /* level unknown (notaz: 8 seems to be too much) */\r
152	return 0;\r
153	case 0x2b: /* DAC Sel (YM2612) */\r
154	/* b7 = dac enable */\r
155	dacen = v & 0x80;\r
156	break; // other side has to know this\r
157	default:\r
158	break;\r
159	}\r
160	break;\r
161	}\r
162	break;\r
163	\r
164	case 2: /* address port 1 */\r
165	ST_address = v;\r
166	addr_A1 = 1;\r
167	//ret=0;\r
168	break;\r
169	\r
170	case 3: /* data port 1 */\r
171	if (addr_A1 != 1) {\r
172	return 0; /* verified on real YM2608 */\r
173	}\r
174	\r
175	addr = ST_address \| 0x100;\r
176	REGS[addr] = v;\r
177	break;\r
178	}\r
179	\r
180	if(currentConfig.EmuOpt & 4) {\r
181	/* queue this write for 940 */\r
182	if (writebuff_ptr < 2047) {\r
183	if (shared_ctl->writebuffsel == 1) {\r
184	shared_ctl->writebuff0[writebuff_ptr++] = (a<<8)\|v;\r
185	} else {\r
186	shared_ctl->writebuff1[writebuff_ptr++] = (a<<8)\|v;\r
187	}\r
188	} else {\r
189	printf("warning: writebuff_ptr > 2047\n");\r
190	}\r
191	}\r
192	\r
193	return 0; // cause the engine to do updates once per frame only\r
194	}\r
195	\r
196	UINT8 YM2612Read_940(void)\r
197	{\r
198	return ST_status;\r
199	}\r
200	\r
201	\r
202	int YM2612PicoTick_940(int n)\r
203	{\r
204	//int ret = 0;\r
205	\r
206	// timer A\r
207	if(ST_mode & 0x01 && (ST_TAT+=64*n) >= ST_TAC) {\r
208	ST_TAT -= ST_TAC;\r
209	if(ST_mode & 0x04) ST_status \|= 1;\r
210	// CSM mode total level latch and auto key on\r
211	/* FIXME\r
212	if(ST_mode & 0x80) {\r
213	CSMKeyControll( &(ym2612_940->CH[2]) ); // Vectorman2, etc.\r
214	ret = 1;\r
215	}\r
216	*/\r
217	}\r
218	\r
219	// timer B\r
220	if(ST_mode & 0x02 && (ST_TBT+=64*n) >= ST_TBC) {\r
221	ST_TBT -= ST_TBC;\r
222	if(ST_mode & 0x08) ST_status \|= 2;\r
223	}\r
224	\r
225	return 0;\r
226	}\r
227	\r
228	\r
edbb82f8	229	#define CHECK_BUSY(job) \\r
	230	(gp2x_memregs[0x3b46>>1] & (1<<(job-1)))\r
	231	\r
	232	static void wait_busy_940(int job)\r
720ee7f6	233	{\r
720ee7f6	234	int i;\r
720ee7f6	235	\r
edbb82f8	236	job--;\r
edbb82f8	237	for (i = 0; (gp2x_memregs[0x3b46>>1] & (1<<job)) && i < 0x10000; i++)\r
b30a8e67	238	spend_cycles(8*1024); // tested to be best for mp3 dec\r
720ee7f6	239	if (i < 0x10000) return;\r
	240	\r
	241	/* 940 crashed */\r
b30a8e67	242	printf("940 crashed (cnt: %i, ve: ", shared_ctl->loopc);\r
720ee7f6	243	for (i = 0; i < 8; i++)\r
	244	printf("%i ", shared_ctl->vstarts[i]);\r
	245	printf(")\n");\r
edbb82f8	246	printf("irq pending flags: DUALCPU %04x, SRCPND %08lx (see 26), INTPND %08lx\n",\r
49fe50f0	247	gp2x_memregs[0x3b46>>1], gp2x_memregl[0x4500>>2], gp2x_memregl[0x4510>>2]);\r
edbb82f8	248	printf("last lr: %08x, lastjob: %i\n", shared_ctl->last_lr, shared_ctl->lastjob);\r
49fe50f0	249	printf("trying to interrupt..\n");\r
49fe50f0	250	gp2x_memregs[0x3B3E>>1] = 0xffff;\r
edbb82f8	251	for (i = 0; gp2x_memregs[0x3b46>>1] && i < 0x10000; i++)\r
49fe50f0	252	spend_cycles(8*1024);\r
49fe50f0	253	printf("i = 0x%x\n", i);\r
edbb82f8	254	printf("irq pending flags: DUALCPU %04x, SRCPND %08lx (see 26), INTPND %08lx\n",\r
49fe50f0	255	gp2x_memregs[0x3b46>>1], gp2x_memregl[0x4500>>2], gp2x_memregl[0x4510>>2]);\r
edbb82f8	256	printf("last lr: %08x, lastjob: %i\n", shared_ctl->last_lr, shared_ctl->lastjob);\r
49fe50f0	257	\r
720ee7f6	258	strcpy(menuErrorMsg, "940 crashed.");\r
	259	engineState = PGS_Menu;\r
	260	crashed_940 = 1;\r
720ee7f6	261	}\r
	262	\r
	263	\r
edbb82f8	264	static void add_job_940(int job)\r
720ee7f6	265	{\r
edbb82f8	266	if (job <= 0 \|\| job > 16) {\r
	267	printf("add_job_940: bad job: %i\n", job);\r
	268	return;\r
49fe50f0	269	}\r
edbb82f8	270	\r
	271	// generate interrupt for this job\r
	272	job--;\r
	273	gp2x_memregs[(0x3B20+job*2)>>1] = 1;\r
	274	\r
	275	// printf("added %i, pending %04x\n", job+1, gp2x_memregs[0x3b46>>1]);\r
720ee7f6	276	}\r
	277	\r
	278	\r
	279	void YM2612PicoStateLoad_940(void)\r
	280	{\r
	281	int i, old_A1 = addr_A1;\r
	282	\r
720ee7f6	283	// feed all the registers and update internal state\r
	284	for(i = 0; i < 0x100; i++) {\r
	285	YM2612Write_940(0, i);\r
	286	YM2612Write_940(1, REGS[i]);\r
	287	}\r
	288	for(i = 0; i < 0x100; i++) {\r
	289	YM2612Write_940(2, i);\r
	290	YM2612Write_940(3, REGS[i\|0x100]);\r
	291	}\r
	292	\r
	293	addr_A1 = old_A1;\r
	294	\r
edbb82f8	295	add_job_940(JOB940_PICOSTATELOAD);\r
720ee7f6	296	}\r
	297	\r
	298	\r
	299	static void internal_reset(void)\r
	300	{\r
	301	writebuff_ptr = 0;\r
	302	ST_mode = 0;\r
	303	ST_status = 0; /* normal mode */\r
	304	ST_TA = 0;\r
	305	ST_TAC = 0;\r
	306	ST_TB = 0;\r
	307	ST_TBC = 0;\r
	308	dacen = 0;\r
	309	}\r
	310	\r
	311	\r
52d3dd5f	312	/* this must be called after mmu hack, the allocated regions must not get cached */\r
	313	void sharedmem_init(void)\r
	314	{\r
	315	if (shared_mem != NULL) return;\r
	316	\r
	317	shared_mem = (unsigned char *) mmap(0, 0x210000, PROT_READ\|PROT_WRITE, MAP_SHARED, memdev, 0x2000000);\r
	318	if(shared_mem == MAP_FAILED)\r
	319	{\r
	320	printf("mmap(shared_data) failed with %i\n", errno);\r
	321	exit(1);\r
	322	}\r
	323	shared_data = (_940_data_t *) (shared_mem+0x100000);\r
	324	/* this area must not get buffered on either side */\r
	325	shared_ctl = (_940_ctl_t *) (shared_mem+0x200000);\r
	326	mp3_mem = (unsigned char *) mmap(0, MP3_SIZE_MAX, PROT_READ\|PROT_WRITE, MAP_SHARED, memdev, 0x3000000);\r
	327	if (mp3_mem == MAP_FAILED)\r
	328	{\r
	329	printf("mmap(mp3_mem) failed with %i\n", errno);\r
	330	exit(1);\r
	331	}\r
	332	crashed_940 = 1;\r
	333	}\r
	334	\r
	335	\r
4dfd9f42	336	void sharedmem_deinit(void)\r
	337	{\r
	338	munmap(shared_mem, 0x210000);\r
	339	munmap(mp3_mem, MP3_SIZE_MAX);\r
	340	shared_mem = mp3_mem = NULL;\r
	341	shared_data = NULL;\r
	342	shared_ctl = NULL;\r
	343	}\r
	344	\r
	345	\r
720ee7f6	346	extern char **g_argv;\r
	347	\r
	348	/* none of the functions in this file should be called before this one */\r
	349	void YM2612Init_940(int baseclock, int rate)\r
	350	{\r
	351	printf("YM2612Init_940()\n");\r
8dfb9fd5	352	printf("Mem usage: shared_data: %i, shared_ctl: %i\n", sizeof(shared_data), sizeof(shared_ctl));\r
720ee7f6	353	\r
8dfb9fd5	354	Reset940(1, 2);\r
720ee7f6	355	Pause940(1);\r
720ee7f6	356	\r
49fe50f0	357	gp2x_memregs[0x3B40>>1] = 0; // disable DUALCPU interrupts for 920\r
49fe50f0	358	gp2x_memregs[0x3B42>>1] = 1; // enable DUALCPU interrupts for 940\r
720ee7f6	359	\r
edbb82f8	360	gp2x_memregl[0x4504>>2] = 0; // make sure no FIQs will be generated\r
	361	gp2x_memregl[0x4508>>2] = ~(1<<26); // unmask DUALCPU ints in the undocumented 940's interrupt controller\r
	362	\r
	363	\r
720ee7f6	364	if (crashed_940)\r
	365	{\r
	366	unsigned char ucData[1024];\r
	367	int nRead, i, nLen = 0;\r
	368	char binpath[1024];\r
	369	FILE *fp;\r
	370	\r
	371	strncpy(binpath, g_argv[0], 1023);\r
	372	binpath[1023] = 0;\r
	373	for (i = strlen(binpath); i > 0; i--)\r
	374	if (binpath[i] == '/') { binpath[i] = 0; break; }\r
	375	strcat(binpath, "/code940.bin");\r
	376	\r
	377	fp = fopen(binpath, "rb");\r
	378	if(!fp)\r
	379	{\r
	380	memset(gp2x_screen, 0, 320*240);\r
	381	gp2x_text_out8(10, 100, "failed to open required file:");\r
	382	gp2x_text_out8(10, 110, "code940.bin");\r
	383	gp2x_video_flip();\r
	384	printf("failed to open %s\n", binpath);\r
	385	exit(1);\r
	386	}\r
	387	\r
	388	while(1)\r
	389	{\r
	390	nRead = fread(ucData, 1, 1024, fp);\r
	391	if(nRead <= 0)\r
	392	break;\r
	393	memcpy(shared_mem + nLen, ucData, nRead);\r
	394	nLen += nRead;\r
	395	}\r
	396	fclose(fp);\r
	397	crashed_940 = 0;\r
	398	}\r
	399	\r
	400	memset(shared_data, 0, sizeof(*shared_data));\r
	401	memset(shared_ctl, 0, sizeof(*shared_ctl));\r
	402	\r
	403	REGS = YM2612GetRegs();\r
	404	\r
	405	ym2612_dacen = &dacen;\r
	406	ym2612_dacout = &dacout;\r
	407	\r
	408	internal_reset();\r
	409	\r
979ba09f	410	loaded_mp3 = 0;\r
979ba09f	411	\r
49fe50f0	412	gp2x_memregs[0x3B46>>1] = 0xffff; // clear pending DUALCPU interrupts for 940\r
edbb82f8	413	gp2x_memregl[0x4500>>2] = 0xffffffff; // clear pending IRQs in SRCPND\r
edbb82f8	414	gp2x_memregl[0x4510>>2] = 0xffffffff; // clear pending IRQs in INTPND\r
720ee7f6	415	\r
720ee7f6	416	/* start the 940 */\r
8dfb9fd5	417	Reset940(0, 2);\r
720ee7f6	418	Pause940(0);\r
	419	\r
	420	// YM2612ResetChip_940(); // will be done on JOB940_YM2612INIT\r
edbb82f8	421	\r
	422	/* now cause 940 to init it's ym2612 stuff */\r
	423	shared_ctl->baseclock = baseclock;\r
	424	shared_ctl->rate = rate;\r
	425	add_job_940(JOB940_INITALL);\r
720ee7f6	426	}\r
	427	\r
	428	\r
	429	void YM2612ResetChip_940(void)\r
	430	{\r
	431	printf("YM2612ResetChip_940()\n");\r
	432	if (shared_data == NULL) {\r
	433	printf("YM2612ResetChip_940: reset before init?\n");\r
	434	return;\r
	435	}\r
	436	\r
720ee7f6	437	internal_reset();\r
720ee7f6	438	\r
edbb82f8	439	add_job_940(JOB940_YM2612RESETCHIP);\r
720ee7f6	440	}\r
	441	\r
	442	\r
edbb82f8	443	int YM2612UpdateOne_940(int *buffer, int length, int stereo, int is_buf_empty)\r
598e7c06	444	{\r
edbb82f8	445	int *ym_buf = shared_data->ym_buffer;\r
4dfd9f42	446	int ym_active_chs;\r
49fe50f0	447	\r
edbb82f8	448	//printf("YM2612UpdateOne_940()\n");\r
	449	\r
	450	if (CHECK_BUSY(JOB940_YM2612UPDATEONE)) wait_busy_940(JOB940_YM2612UPDATEONE);\r
	451	\r
4dfd9f42	452	ym_active_chs = shared_ctl->ym_active_chs;\r
edbb82f8	453	\r
4dfd9f42	454	// mix in ym buffer. is_buf_empty means nobody mixed there anything yet and it may contain trash\r
	455	if (is_buf_empty && ym_active_chs) memcpy32(buffer, ym_buf, length<<stereo);\r
	456	else memset32(buffer, 0, length<<stereo);\r
edbb82f8	457	\r
	458	if (shared_ctl->writebuffsel == 1) {\r
	459	shared_ctl->writebuff0[writebuff_ptr] = 0xffff;\r
49fe50f0	460	} else {\r
edbb82f8	461	shared_ctl->writebuff1[writebuff_ptr] = 0xffff;\r
598e7c06	462	}\r
edbb82f8	463	writebuff_ptr = 0;\r
	464	\r
	465	/* predict sample counter for next frame */\r
	466	if (PsndLen_exc_add) {\r
	467	if (PsndLen_exc_cnt + PsndLen_exc_add >= 0x10000) length = PsndLen + 1;\r
	468	else length = PsndLen;\r
	469	}\r
	470	\r
	471	/* give 940 ym job */\r
	472	shared_ctl->writebuffsel ^= 1;\r
	473	shared_ctl->length = length;\r
	474	shared_ctl->stereo = stereo;\r
	475	\r
	476	add_job_940(JOB940_YM2612UPDATEONE);\r
	477	\r
4dfd9f42	478	return ym_active_chs;\r
598e7c06	479	}\r
598e7c06	480	\r
598e7c06	481	\r
979ba09f	482	static int mp3_samples_ready = 0, mp3_buffer_offs = 0;\r
edbb82f8	483	static int mp3_play_bufsel = 0, mp3_job_started = 0;\r
598e7c06	484	\r
edbb82f8	485	void mp3_update(int *buffer, int length, int stereo)\r
720ee7f6	486	{\r
edbb82f8	487	int length_mp3;\r
edbb82f8	488	int cdda_on;\r
49fe50f0	489	\r
edbb82f8	490	// not data track, CDC is reading, playback was started, track not ended\r
	491	cdda_on = !(Pico_mcd->s68k_regs[0x36] & 1) && (Pico_mcd->scd.Status_CDC & 1) &&\r
	492	loaded_mp3 && shared_ctl->mp3_offs < shared_ctl->mp3_len;\r
720ee7f6	493	\r
edbb82f8	494	if (!cdda_on) return;\r
720ee7f6	495	\r
edbb82f8	496	if (!(PicoOpt&0x200)) {\r
	497	mp3_update_local(buffer, length, stereo);\r
	498	return;\r
	499	}\r
720ee7f6	500	\r
edbb82f8	501	length_mp3 = length;\r
	502	if (PsndRate == 22050) length_mp3 <<= 1; // mp3s are locked to 44100Hz stereo\r
	503	else if (PsndRate == 11025) length_mp3 <<= 2; // so make length 44100ish\r
49fe50f0	504	\r
edbb82f8	505	/* do we have to wait? */\r
	506	if (mp3_job_started && mp3_samples_ready < length_mp3) {\r
	507	if (CHECK_BUSY(JOB940_MP3DECODE)) wait_busy_940(JOB940_MP3DECODE);\r
	508	mp3_job_started = 0;\r
	509	mp3_samples_ready += 1152;\r
	510	}\r
598e7c06	511	\r
49fe50f0	512	/* mix mp3 data, only stereo */\r
edbb82f8	513	if (mp3_samples_ready >= length_mp3)\r
598e7c06	514	{\r
49fe50f0	515	int shr = 0;\r
	516	void (mix_samples)(int dest_buf, short *mp3_buf, int count) = mix_16h_to_32;\r
	517	if (PsndRate == 22050) { mix_samples = mix_16h_to_32_s1; shr = 1; }\r
	518	else if (PsndRate == 11025) { mix_samples = mix_16h_to_32_s2; shr = 2; }\r
598e7c06	519	\r
49fe50f0	520	if (1152 - mp3_buffer_offs >= length_mp3) {\r
edbb82f8	521	mix_samples(buffer, shared_data->mp3_buffer[mp3_play_bufsel] + mp3_buffer_offs*2, length<<1);\r
49fe50f0	522	\r
49fe50f0	523	mp3_buffer_offs += length_mp3;\r
598e7c06	524	} else {\r
edbb82f8	525	// collect samples from both buffers..\r
598e7c06	526	int left = 1152 - mp3_buffer_offs;\r
49fe50f0	527	if (mp3_play_bufsel == 0)\r
49fe50f0	528	{\r
edbb82f8	529	mix_samples(buffer, shared_data->mp3_buffer[0] + mp3_buffer_offs*2, length<<1);\r
49fe50f0	530	mp3_buffer_offs = length_mp3 - left;\r
	531	mp3_play_bufsel = 1;\r
	532	} else {\r
	533	mix_samples(buffer, shared_data->mp3_buffer[1] + mp3_buffer_offs*2, (left>>shr)<<1);\r
	534	mp3_buffer_offs = length_mp3 - left;\r
	535	mix_samples(buffer + ((left>>shr)<<1),\r
	536	shared_data->mp3_buffer[0], (mp3_buffer_offs>>shr)<<1);\r
	537	mp3_play_bufsel = 0;\r
	538	}\r
720ee7f6	539	}\r
49fe50f0	540	mp3_samples_ready -= length_mp3;\r
720ee7f6	541	}\r
720ee7f6	542	\r
edbb82f8	543	// ask to decode more if we already can\r
edbb82f8	544	if (!mp3_job_started)\r
598e7c06	545	{\r
edbb82f8	546	mp3_job_started = 1;\r
598e7c06	547	shared_ctl->mp3_buffsel ^= 1;\r
edbb82f8	548	add_job_940(JOB940_MP3DECODE);\r
598e7c06	549	}\r
720ee7f6	550	}\r
598e7c06	551	\r
	552	\r
	553	/***********************************************************/\r
	554	\r
	555	void mp3_start_play(FILE *f, int pos) // pos is 0-1023\r
	556	{\r
	557	int byte_offs = 0;\r
	558	\r
7bc9cd7f	559	if (!(PicoOpt&0x800)) { // cdda disabled?\r
598e7c06	560	return;\r
	561	}\r
	562	\r
	563	if (loaded_mp3 != f)\r
	564	{\r
49fe50f0	565	// printf("loading mp3... "); fflush(stdout);\r
598e7c06	566	fseek(f, 0, SEEK_SET);\r
598e7c06	567	fread(mp3_mem, 1, MP3_SIZE_MAX, f);\r
49fe50f0	568	// if (feof(f)) printf("done.\n");\r
49fe50f0	569	// else printf("done. mp3 too large, not all data loaded.\n");\r
598e7c06	570	shared_ctl->mp3_len = ftell(f);\r
598e7c06	571	loaded_mp3 = f;\r
edbb82f8	572	\r
	573	if (PicoOpt&0x200) {\r
	574	// as we are going to change 940's cacheable area, we must invalidate it's cache..\r
	575	if (CHECK_BUSY(JOB940_MP3DECODE)) wait_busy_940(JOB940_MP3DECODE);\r
	576	add_job_940(JOB940_INVALIDATE_DCACHE);\r
	577	}\r
598e7c06	578	}\r
	579	\r
	580	// seek..\r
	581	if (pos) {\r
	582	byte_offs = (shared_ctl->mp3_len << 6) >> 10;\r
	583	byte_offs *= pos;\r
	584	byte_offs >>= 6;\r
	585	}\r
49fe50f0	586	// printf("mp3 pos1024: %i, byte_offs %i/%i\n", pos, byte_offs, shared_ctl->mp3_len);\r
598e7c06	587	\r
598e7c06	588	shared_ctl->mp3_offs = byte_offs;\r
979ba09f	589	\r
edbb82f8	590	// reset buffer pointers and stuff..\r
979ba09f	591	mp3_samples_ready = mp3_buffer_offs = mp3_play_bufsel = 0;\r
edbb82f8	592	mp3_job_started = 0;\r
979ba09f	593	shared_ctl->mp3_buffsel = 1; // will change to 0 on first decode\r
edbb82f8	594	\r
edbb82f8	595	if (!(PicoOpt&0x200)) mp3_start_local();\r
598e7c06	596	}\r
	597	\r
	598	\r
98c9d8d9	599	int mp3_get_offset(void)\r
	600	{\r
	601	int offs1024 = 0;\r
	602	int cdda_on;\r
	603	\r
7bc9cd7f	604	cdda_on = (PicoMCD & 1) && (PicoOpt&0x800) && !(Pico_mcd->s68k_regs[0x36] & 1) &&\r
edbb82f8	605	(Pico_mcd->scd.Status_CDC & 1) && loaded_mp3;\r
98c9d8d9	606	\r
	607	if (cdda_on) {\r
	608	offs1024 = shared_ctl->mp3_offs << 7;\r
	609	offs1024 /= shared_ctl->mp3_len;\r
	610	offs1024 <<= 3;\r
	611	}\r
	612	printf("offs1024=%i (%i/%i)\n", offs1024, shared_ctl->mp3_offs, shared_ctl->mp3_len);\r
	613	\r
	614	return offs1024;\r
	615	}\r
	616	\r
	617	\r