[picodrive.git] / platform / gp2x / 940ctl_ym2612.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 "../../Pico/PicoInt.h"\r
\r
// tmp\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
static _940_ctl_t *shared_ctl = 0;\r
static 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
static int g_busy = 10;\r
\r
static void wait_busy_940(void)\r
{\r
	int i;\r
#if 0\r
	printf("940 busy, entering wait loop.. (cnt: %i, wc: %i, ve: ", shared_ctl->loopc, shared_ctl->waitc);\r
	for (i = 0; i < 8; i++)\r
		printf("%i ", shared_ctl->vstarts[i]);\r
	printf(")\n");\r
\r
	for (i = 0; shared_ctl->busy; i++)\r
	{\r
		spend_cycles(1024); /* needs tuning */\r
	}\r
	printf("wait iterations: %i\n", i);\r
#else\r
	for (i = 0; /*shared_ctl->busy*/gp2x_memregs[0x3B3E>>1] && i < 0x10000; i++)\r
		spend_cycles(8*1024); // tested to be best for mp3 dec\r
	//printf("i = 0x%x\n", i);\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 (see 15?), SRCPND %08lx (see 26), INTPND %08lx\n",\r
		gp2x_memregs[0x3b46>>1], gp2x_memregl[0x4500>>2], gp2x_memregl[0x4510>>2]);\r
	printf("last irq PC: %08x, lastjob: 0x%03x, busy: %x, lastbusy: %x, g_busy: %x\n", shared_ctl->last_irq_pc,\r
			shared_ctl->lastjob, gp2x_memregs[0x3B3E>>1]/*shared_ctl->busy*/, shared_ctl->lastbusy, g_busy);\r
	printf("trying to interrupt..\n");\r
	gp2x_memregs[0x3B3E>>1] = 0xffff;\r
	for (i = 0; /*shared_ctl->busy*/gp2x_memregs[0x3B3E>>1] && i < 0x10000; i++)\r
		spend_cycles(8*1024);\r
	printf("i = 0x%x\n", i);\r
	printf("irq pending flags: DUALCPU %04x (see 15?), SRCPND %08lx (see 26), INTPND %08lx\n",\r
		gp2x_memregs[0x3b46>>1], gp2x_memregl[0x4500>>2], gp2x_memregl[0x4510>>2]);\r
	printf("last irq PC: %08x, lastjob: 0x%03x, busy: %x\n", shared_ctl->last_irq_pc, shared_ctl->lastjob, gp2x_memregs[0x3B3E>>1]/*shared_ctl->busy*/);\r
\r
	strcpy(menuErrorMsg, "940 crashed.");\r
	engineState = PGS_Menu;\r
	crashed_940 = 1;\r
#endif\r
}\r
\r
\r
static void add_job_940(int job0, int job1)\r
{\r
/*	if (gp2x_memregs[0x3b46>>1] || shared_ctl->busy)\r
	{\r
		printf("!!add_job_940: irq pending flags: DUALCPU %04x (see 15?), SRCPND %08lx (see 26), INTPND %08lx, busy: %x\n",\r
				gp2x_memregs[0x3b46>>1], gp2x_memregl[0x4500>>2], gp2x_memregl[0x4510>>2], shared_ctl->busy);\r
	}\r
*/\r
	shared_ctl->jobs[0] = job0;\r
	shared_ctl->jobs[1] = job1;\r
	//shared_ctl->busy = ++g_busy; // 1;\r
	gp2x_memregs[0x3B3E>>1] = ++g_busy; // set busy flag\r
//	gp2x_memregs[0x3B3E>>1] = 0xffff; // cause interrupt\r
}\r
\r
\r
void YM2612PicoStateLoad_940(void)\r
{\r
	int i, old_A1 = addr_A1;\r
\r
	if (/*shared_ctl->busy*/gp2x_memregs[0x3B3E>>1]) wait_busy_940();\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, 0);\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
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
	if (shared_mem == NULL)\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
	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
	/* now cause 940 to init it's ym2612 stuff */\r
	shared_ctl->baseclock = baseclock;\r
	shared_ctl->rate = rate;\r
	shared_ctl->jobs[0] = JOB940_INITALL;\r
	shared_ctl->jobs[1] = 0;\r
	//shared_ctl->busy = 1;\r
	gp2x_memregs[0x3B3E>>1] = 1; // set busy flag\r
\r
	gp2x_memregs[0x3B46>>1] = 0xffff; // clear pending DUALCPU interrupts for 940\r
	gp2x_memregl[0x4500>>2] = 0; // clear pending IRQs in SRCPND\r
	gp2x_memregl[0x4510>>2] = 0; // clear pending IRQs in INTPND\r
	gp2x_memregl[0x4508>>2] = ~(1<<26); // unmask DUALCPU ints in the undocumented 940's interrupt controller\r
\r
	/* start the 940 */\r
	Reset940(0, 2);\r
	Pause940(0);\r
\r
	// YM2612ResetChip_940(); // will be done on JOB940_YM2612INIT\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
	if (/*shared_ctl->busy*/gp2x_memregs[0x3B3E>>1]) wait_busy_940();\r
\r
	internal_reset();\r
\r
	add_job_940(JOB940_YM2612RESETCHIP, 0);\r
}\r
\r
\r
//extern int pcm_buffer[2*44100/50];\r
/*\r
static void mix_samples(int *dest_buf, short *mp3_buf, int len, int stereo)\r
{\r
//	int *pcm = pcm_buffer + offset * 2;\r
\r
	if (stereo)\r
	{\r
		for (; len > 0; len--)\r
		{\r
			int lm, rm;\r
			lm = *mp3_buf++; rm = *mp3_buf++;\r
			*dest_buf++ += lm - lm/2; *dest_buf++ += rm - rm/2;\r
		}\r
	} else {\r
		for (; len > 0; len--)\r
		{\r
			int l = *mp3_buf++;\r
			*dest_buf++ = l - l/2;\r
		}\r
	}\r
}\r
*/\r
\r
// here we assume that length is different between games, but constant in one game\r
\r
static int mp3_samples_ready = 0, mp3_buffer_offs = 0;\r
static int mp3_play_bufsel = 0;\r
\r
int YM2612UpdateOne_940(int *buffer, int length, int stereo, int is_buf_empty)\r
{\r
	int length_mp3 = Pico.m.pal ? 44100/50 : 44100/60; // mp3s are locked to 44100Hz stereo\r
	int *ym_buf = shared_data->mix_buffer;\r
//	int *dest_buf = buffer;\r
	int cdda_on, mp3_job = 0;\r
//	int len;\r
\r
	// emulating CD, enabled in opts, not data track, CDC is reading, playback was started, track not ended\r
	cdda_on = (PicoMCD & 1) && (PicoOpt & 0x800) && !(Pico_mcd->s68k_regs[0x36] & 1) &&\r
		(Pico_mcd->scd.Status_CDC & 1) && loaded_mp3;\r
\r
	//printf("YM2612UpdateOne_940()\n");\r
	if (/*shared_ctl->busy*/gp2x_memregs[0x3B3E>>1]) wait_busy_940();\r
\r
	// track ended?\r
	cdda_on = cdda_on && shared_ctl->mp3_offs < shared_ctl->mp3_len;\r
\r
	// mix in ym buffer\r
	if (is_buf_empty) memcpy32(buffer, ym_buf, length<<stereo);\r
	// else TODO\r
\r
//	for (len = length << stereo; len > 0; len--)\r
//	{\r
//		*dest_buf++ += *ym_buf++;\r
//	}\r
\r
	/* mix mp3 data, only stereo */\r
	if (cdda_on && 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_mp3>>shr)<<1);\r
\r
			mp3_buffer_offs += length_mp3;\r
		} else {\r
			// collect 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_mp3>>shr)<<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
	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
	// make sure we will have enough mp3 samples next frame\r
	if (cdda_on && mp3_samples_ready < length_mp3)\r
	{\r
		shared_ctl->mp3_buffsel ^= 1;\r
		mp3_job = JOB940_MP3DECODE;\r
		mp3_samples_ready += 1152;\r
	}\r
\r
	add_job_940(JOB940_YM2612UPDATEONE, mp3_job);\r
	//spend_cycles(512);\r
	//printf("SRCPND: %08lx, INTMODE: %08lx, INTMASK: %08lx, INTPEND: %08lx\n",\r
	//	gp2x_memregl[0x4500>>2], gp2x_memregl[0x4504>>2], gp2x_memregl[0x4508>>2], gp2x_memregl[0x4510>>2]);\r
\r
	return 1;\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
\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..\r
	mp3_samples_ready = mp3_buffer_offs = mp3_play_bufsel = 0;\r
	shared_ctl->mp3_buffsel = 1; // will change to 0 on first decode\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 && shared_ctl->mp3_offs < shared_ctl->mp3_len;\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
cc68a136	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
42c7b147	10	#include "code940/940shared.h"\r
cc68a136	11	#include "gp2x.h"\r
	12	#include "emu.h"\r
	13	#include "menu.h"\r
	14	#include "asmutils.h"\r
cb0316e4	15	#include "../../Pico/PicoInt.h"\r
cc68a136	16	\r
4f265db7	17	// tmp\r
	18	#include "../../Pico/sound/mix.h"\r
	19	\r
cc68a136	20	/* we will need some gp2x internals here */\r
	21	extern volatile unsigned short gp2x_memregs; / from minimal library rlyeh */\r
	22	extern volatile unsigned long *gp2x_memregl;\r
	23	\r
	24	static unsigned char *shared_mem = 0;\r
	25	static _940_data_t *shared_data = 0;\r
	26	static _940_ctl_t *shared_ctl = 0;\r
cb0316e4	27	static unsigned char *mp3_mem = 0;\r
	28	\r
	29	#define MP3_SIZE_MAX (0x1000000 - 4640480)\r
cc68a136	30	\r
	31	int crashed_940 = 0;\r
	32	\r
51a902ae	33	static FILE *loaded_mp3 = 0;\r
cc68a136	34	\r
	35	/***********************************************************/\r
	36	\r
	37	#define MAXOUT (+32767)\r
	38	#define MINOUT (-32768)\r
	39	\r
	40	/* limitter */\r
	41	#define Limit(val, max,min) { \\r
	42	if ( val > max ) val = max; \\r
	43	else if ( val < min ) val = min; \\r
	44	}\r
	45	\r
	46	/* these will be managed locally on our side */\r
	47	extern int *ym2612_dacen;\r
	48	extern INT32 *ym2612_dacout;\r
	49	extern void *ym2612_regs;\r
	50	\r
	51	static UINT8 REGS = 0; / we will also keep local copy of regs for savestates and such */\r
	52	static INT32 addr_A1; /* address line A1 */\r
	53	static int dacen;\r
	54	static INT32 dacout;\r
	55	static UINT8 ST_address; /* address register */\r
	56	static UINT8 ST_status; /* status flag */\r
	57	static UINT8 ST_mode; /* mode CSM / 3SLOT */\r
	58	static int ST_TA; /* timer a */\r
	59	static int ST_TAC; /* timer a maxval */\r
	60	static int ST_TAT; /* timer a ticker */\r
	61	static UINT8 ST_TB; /* timer b */\r
	62	static int ST_TBC; /* timer b maxval */\r
	63	static int ST_TBT; /* timer b ticker */\r
	64	\r
	65	static int writebuff_ptr = 0;\r
	66	\r
	67	\r
	68	/* OPN Mode Register Write */\r
	69	static void set_timers( int v )\r
	70	{\r
	71	/* b7 = CSM MODE */\r
	72	/* b6 = 3 slot mode */\r
	73	/* b5 = reset b */\r
	74	/* b4 = reset a */\r
	75	/* b3 = timer enable b */\r
	76	/* b2 = timer enable a */\r
	77	/* b1 = load b */\r
	78	/* b0 = load a */\r
	79	ST_mode = v;\r
	80	\r
	81	/* reset Timer b flag */\r
	82	if( v & 0x20 )\r
	83	ST_status &= ~2;\r
	84	\r
	85	/* reset Timer a flag */\r
	86	if( v & 0x10 )\r
	87	ST_status &= ~1;\r
	88	}\r
	89	\r
	90	/* YM2612 write */\r
	91	/* a = address */\r
	92	/* v = value */\r
	93	/* returns 1 if sample affecting state changed */\r
	94	int YM2612Write_940(unsigned int a, unsigned int v)\r
	95	{\r
	96	int addr; //, ret=1;\r
	97	\r
98	v &= 0xff; /* adjust to 8 bit bus */\r
99	a &= 3;\r
100	\r
101	switch( a ) {\r
102	case 0: /* address port 0 */\r
103	ST_address = v;\r
104	addr_A1 = 0;\r
105	//ret=0;\r
106	break;\r
107	\r
108	case 1: /* data port 0 */\r
109	if (addr_A1 != 0) {\r
110	return 0; /* verified on real YM2608 */\r
111	}\r
112	\r
113	addr = ST_address;\r
114	REGS[addr] = v;\r
115	\r
116	switch( addr & 0xf0 )\r
117	{\r
118	case 0x20: /* 0x20-0x2f Mode */\r
119	switch( addr )\r
120	{\r
121	case 0x24: { // timer A High 8\r
122	int TAnew = (ST_TA & 0x03)\|(((int)v)<<2);\r
123	if(ST_TA != TAnew) {\r
124	// we should reset ticker only if new value is written. Outrun requires this.\r
125	ST_TA = TAnew;\r
126	ST_TAC = (1024-TAnew)*18;\r
127	ST_TAT = 0;\r
128	}\r
129	return 0;\r
130	}\r
131	case 0x25: { // timer A Low 2\r
132	int TAnew = (ST_TA & 0x3fc)\|(v&3);\r
133	if(ST_TA != TAnew) {\r
134	ST_TA = TAnew;\r
135	ST_TAC = (1024-TAnew)*18;\r
136	ST_TAT = 0;\r
137	}\r
138	return 0;\r
139	}\r
140	case 0x26: // timer B\r
141	if(ST_TB != v) {\r
142	ST_TB = v;\r
143	ST_TBC = (256-v)<<4;\r
144	ST_TBC *= 18;\r
145	ST_TBT = 0;\r
146	}\r
147	return 0;\r
148	case 0x27: /* mode, timer control */\r
149	set_timers( v );\r
150	break; // other side needs ST.mode for 3slot mode\r
151	case 0x2a: /* DAC data (YM2612) */\r
152	dacout = ((int)v - 0x80) << 6; /* level unknown (notaz: 8 seems to be too much) */\r
153	return 0;\r
154	case 0x2b: /* DAC Sel (YM2612) */\r
155	/* b7 = dac enable */\r
156	dacen = v & 0x80;\r
157	break; // other side has to know this\r
158	default:\r
159	break;\r
160	}\r
161	break;\r
162	}\r
163	break;\r
164	\r
165	case 2: /* address port 1 */\r
166	ST_address = v;\r
167	addr_A1 = 1;\r
168	//ret=0;\r
169	break;\r
170	\r
171	case 3: /* data port 1 */\r
172	if (addr_A1 != 1) {\r
173	return 0; /* verified on real YM2608 */\r
174	}\r
175	\r
176	addr = ST_address \| 0x100;\r
177	REGS[addr] = v;\r
178	break;\r
179	}\r
180	\r
181	if(currentConfig.EmuOpt & 4) {\r
182	/* queue this write for 940 */\r
183	if (writebuff_ptr < 2047) {\r
184	if (shared_ctl->writebuffsel == 1) {\r
185	shared_ctl->writebuff0[writebuff_ptr++] = (a<<8)\|v;\r
186	} else {\r
187	shared_ctl->writebuff1[writebuff_ptr++] = (a<<8)\|v;\r
188	}\r
189	} else {\r
190	printf("warning: writebuff_ptr > 2047\n");\r
191	}\r
192	}\r
193	\r
194	return 0; // cause the engine to do updates once per frame only\r
195	}\r
196	\r
197	UINT8 YM2612Read_940(void)\r
198	{\r
199	return ST_status;\r
200	}\r
201	\r
202	\r
203	int YM2612PicoTick_940(int n)\r
204	{\r
205	//int ret = 0;\r
206	\r
207	// timer A\r
208	if(ST_mode & 0x01 && (ST_TAT+=64*n) >= ST_TAC) {\r
209	ST_TAT -= ST_TAC;\r
210	if(ST_mode & 0x04) ST_status \|= 1;\r
211	// CSM mode total level latch and auto key on\r
212	/* FIXME\r
213	if(ST_mode & 0x80) {\r
214	CSMKeyControll( &(ym2612_940->CH[2]) ); // Vectorman2, etc.\r
215	ret = 1;\r
216	}\r
217	*/\r
218	}\r
219	\r
220	// timer B\r
221	if(ST_mode & 0x02 && (ST_TBT+=64*n) >= ST_TBC) {\r
222	ST_TBT -= ST_TBC;\r
223	if(ST_mode & 0x08) ST_status \|= 2;\r
224	}\r
225	\r
226	return 0;\r
227	}\r
228	\r
4f265db7	229	static int g_busy = 10;\r
cc68a136	230	\r
	231	static void wait_busy_940(void)\r
	232	{\r
	233	int i;\r
	234	#if 0\r
	235	printf("940 busy, entering wait loop.. (cnt: %i, wc: %i, ve: ", shared_ctl->loopc, shared_ctl->waitc);\r
	236	for (i = 0; i < 8; i++)\r
	237	printf("%i ", shared_ctl->vstarts[i]);\r
	238	printf(")\n");\r
	239	\r
	240	for (i = 0; shared_ctl->busy; i++)\r
	241	{\r
	242	spend_cycles(1024); /* needs tuning */\r
	243	}\r
	244	printf("wait iterations: %i\n", i);\r
	245	#else\r
4f265db7	246	for (i = 0; /shared_ctl->busy/gp2x_memregs[0x3B3E>>1] && i < 0x10000; i++)\r
42c7b147	247	spend_cycles(8*1024); // tested to be best for mp3 dec\r
4f265db7	248	//printf("i = 0x%x\n", i);\r
cc68a136	249	if (i < 0x10000) return;\r
	250	\r
	251	/* 940 crashed */\r
42c7b147	252	printf("940 crashed (cnt: %i, ve: ", shared_ctl->loopc);\r
cc68a136	253	for (i = 0; i < 8; i++)\r
	254	printf("%i ", shared_ctl->vstarts[i]);\r
	255	printf(")\n");\r
4f265db7	256	printf("irq pending flags: DUALCPU %04x (see 15?), SRCPND %08lx (see 26), INTPND %08lx\n",\r
	257	gp2x_memregs[0x3b46>>1], gp2x_memregl[0x4500>>2], gp2x_memregl[0x4510>>2]);\r
	258	printf("last irq PC: %08x, lastjob: 0x%03x, busy: %x, lastbusy: %x, g_busy: %x\n", shared_ctl->last_irq_pc,\r
	259	shared_ctl->lastjob, gp2x_memregs[0x3B3E>>1]/shared_ctl->busy/, shared_ctl->lastbusy, g_busy);\r
	260	printf("trying to interrupt..\n");\r
	261	gp2x_memregs[0x3B3E>>1] = 0xffff;\r
	262	for (i = 0; /shared_ctl->busy/gp2x_memregs[0x3B3E>>1] && i < 0x10000; i++)\r
	263	spend_cycles(8*1024);\r
	264	printf("i = 0x%x\n", i);\r
	265	printf("irq pending flags: DUALCPU %04x (see 15?), SRCPND %08lx (see 26), INTPND %08lx\n",\r
	266	gp2x_memregs[0x3b46>>1], gp2x_memregl[0x4500>>2], gp2x_memregl[0x4510>>2]);\r
	267	printf("last irq PC: %08x, lastjob: 0x%03x, busy: %x\n", shared_ctl->last_irq_pc, shared_ctl->lastjob, gp2x_memregs[0x3B3E>>1]/shared_ctl->busy/);\r
	268	\r
cc68a136	269	strcpy(menuErrorMsg, "940 crashed.");\r
	270	engineState = PGS_Menu;\r
	271	crashed_940 = 1;\r
	272	#endif\r
	273	}\r
	274	\r
	275	\r
b837b69b	276	static void add_job_940(int job0, int job1)\r
cc68a136	277	{\r
4f265db7	278	/* if (gp2x_memregs[0x3b46>>1] \|\| shared_ctl->busy)\r
	279	{\r
	280	printf("!!add_job_940: irq pending flags: DUALCPU %04x (see 15?), SRCPND %08lx (see 26), INTPND %08lx, busy: %x\n",\r
	281	gp2x_memregs[0x3b46>>1], gp2x_memregl[0x4500>>2], gp2x_memregl[0x4510>>2], shared_ctl->busy);\r
	282	}\r
	283	*/\r
b837b69b	284	shared_ctl->jobs[0] = job0;\r
b837b69b	285	shared_ctl->jobs[1] = job1;\r
4f265db7	286	//shared_ctl->busy = ++g_busy; // 1;\r
	287	gp2x_memregs[0x3B3E>>1] = ++g_busy; // set busy flag\r
	288	// gp2x_memregs[0x3B3E>>1] = 0xffff; // cause interrupt\r
cc68a136	289	}\r
	290	\r
	291	\r
	292	void YM2612PicoStateLoad_940(void)\r
	293	{\r
	294	int i, old_A1 = addr_A1;\r
	295	\r
4f265db7	296	if (/shared_ctl->busy/gp2x_memregs[0x3B3E>>1]) wait_busy_940();\r
cc68a136	297	\r
	298	// feed all the registers and update internal state\r
	299	for(i = 0; i < 0x100; i++) {\r
	300	YM2612Write_940(0, i);\r
	301	YM2612Write_940(1, REGS[i]);\r
	302	}\r
	303	for(i = 0; i < 0x100; i++) {\r
	304	YM2612Write_940(2, i);\r
	305	YM2612Write_940(3, REGS[i\|0x100]);\r
	306	}\r
	307	\r
	308	addr_A1 = old_A1;\r
	309	\r
b837b69b	310	add_job_940(JOB940_PICOSTATELOAD, 0);\r
cc68a136	311	}\r
	312	\r
	313	\r
	314	static void internal_reset(void)\r
	315	{\r
	316	writebuff_ptr = 0;\r
	317	ST_mode = 0;\r
	318	ST_status = 0; /* normal mode */\r
	319	ST_TA = 0;\r
	320	ST_TAC = 0;\r
	321	ST_TB = 0;\r
	322	ST_TBC = 0;\r
	323	dacen = 0;\r
	324	}\r
	325	\r
	326	\r
	327	extern char **g_argv;\r
	328	\r
	329	/* none of the functions in this file should be called before this one */\r
	330	void YM2612Init_940(int baseclock, int rate)\r
	331	{\r
	332	printf("YM2612Init_940()\n");\r
b837b69b	333	printf("Mem usage: shared_data: %i, shared_ctl: %i\n", sizeof(shared_data), sizeof(shared_ctl));\r
cc68a136	334	\r
b837b69b	335	Reset940(1, 2);\r
cc68a136	336	Pause940(1);\r
cc68a136	337	\r
4f265db7	338	gp2x_memregs[0x3B40>>1] = 0; // disable DUALCPU interrupts for 920\r
4f265db7	339	gp2x_memregs[0x3B42>>1] = 1; // enable DUALCPU interrupts for 940\r
cc68a136	340	\r
	341	if (shared_mem == NULL)\r
	342	{\r
b837b69b	343	shared_mem = (unsigned char *) mmap(0, 0x210000, PROT_READ\|PROT_WRITE, MAP_SHARED, memdev, 0x2000000);\r
cc68a136	344	if(shared_mem == MAP_FAILED)\r
	345	{\r
	346	printf("mmap(shared_data) failed with %i\n", errno);\r
	347	exit(1);\r
	348	}\r
	349	shared_data = (_940_data_t *) (shared_mem+0x100000);\r
	350	/* this area must not get buffered on either side */\r
	351	shared_ctl = (_940_ctl_t *) (shared_mem+0x200000);\r
cb0316e4	352	mp3_mem = (unsigned char *) mmap(0, MP3_SIZE_MAX, PROT_READ\|PROT_WRITE, MAP_SHARED, memdev, 0x3000000);\r
	353	if (mp3_mem == MAP_FAILED)\r
	354	{\r
	355	printf("mmap(mp3_mem) failed with %i\n", errno);\r
	356	exit(1);\r
	357	}\r
cc68a136	358	crashed_940 = 1;\r
	359	}\r
	360	\r
	361	if (crashed_940)\r
	362	{\r
	363	unsigned char ucData[1024];\r
	364	int nRead, i, nLen = 0;\r
	365	char binpath[1024];\r
	366	FILE *fp;\r
	367	\r
	368	strncpy(binpath, g_argv[0], 1023);\r
	369	binpath[1023] = 0;\r
	370	for (i = strlen(binpath); i > 0; i--)\r
	371	if (binpath[i] == '/') { binpath[i] = 0; break; }\r
	372	strcat(binpath, "/code940.bin");\r
	373	\r
	374	fp = fopen(binpath, "rb");\r
	375	if(!fp)\r
	376	{\r
	377	memset(gp2x_screen, 0, 320*240);\r
	378	gp2x_text_out8(10, 100, "failed to open required file:");\r
	379	gp2x_text_out8(10, 110, "code940.bin");\r
	380	gp2x_video_flip();\r
	381	printf("failed to open %s\n", binpath);\r
	382	exit(1);\r
	383	}\r
	384	\r
	385	while(1)\r
	386	{\r
	387	nRead = fread(ucData, 1, 1024, fp);\r
	388	if(nRead <= 0)\r
	389	break;\r
	390	memcpy(shared_mem + nLen, ucData, nRead);\r
	391	nLen += nRead;\r
	392	}\r
	393	fclose(fp);\r
	394	crashed_940 = 0;\r
	395	}\r
	396	\r
	397	memset(shared_data, 0, sizeof(*shared_data));\r
	398	memset(shared_ctl, 0, sizeof(*shared_ctl));\r
	399	\r
	400	REGS = YM2612GetRegs();\r
	401	\r
	402	ym2612_dacen = &dacen;\r
	403	ym2612_dacout = &dacout;\r
	404	\r
	405	internal_reset();\r
	406	\r
51a902ae	407	loaded_mp3 = 0;\r
51a902ae	408	\r
cc68a136	409	/* now cause 940 to init it's ym2612 stuff */\r
	410	shared_ctl->baseclock = baseclock;\r
	411	shared_ctl->rate = rate;\r
42c7b147	412	shared_ctl->jobs[0] = JOB940_INITALL;\r
b837b69b	413	shared_ctl->jobs[1] = 0;\r
4f265db7	414	//shared_ctl->busy = 1;\r
	415	gp2x_memregs[0x3B3E>>1] = 1; // set busy flag\r
	416	\r
	417	gp2x_memregs[0x3B46>>1] = 0xffff; // clear pending DUALCPU interrupts for 940\r
	418	gp2x_memregl[0x4500>>2] = 0; // clear pending IRQs in SRCPND\r
	419	gp2x_memregl[0x4510>>2] = 0; // clear pending IRQs in INTPND\r
	420	gp2x_memregl[0x4508>>2] = ~(1<<26); // unmask DUALCPU ints in the undocumented 940's interrupt controller\r
cc68a136	421	\r
cc68a136	422	/* start the 940 */\r
b837b69b	423	Reset940(0, 2);\r
cc68a136	424	Pause940(0);\r
	425	\r
	426	// YM2612ResetChip_940(); // will be done on JOB940_YM2612INIT\r
	427	}\r
	428	\r
	429	\r
	430	void YM2612ResetChip_940(void)\r
	431	{\r
	432	printf("YM2612ResetChip_940()\n");\r
	433	if (shared_data == NULL) {\r
	434	printf("YM2612ResetChip_940: reset before init?\n");\r
	435	return;\r
	436	}\r
	437	\r
4f265db7	438	if (/shared_ctl->busy/gp2x_memregs[0x3B3E>>1]) wait_busy_940();\r
cc68a136	439	\r
	440	internal_reset();\r
	441	\r
b837b69b	442	add_job_940(JOB940_YM2612RESETCHIP, 0);\r
cc68a136	443	}\r
	444	\r
	445	\r
4f265db7	446	//extern int pcm_buffer[2*44100/50];\r
	447	/*\r
	448	static void mix_samples(int dest_buf, short mp3_buf, int len, int stereo)\r
cb0316e4	449	{\r
4f265db7	450	// int pcm = pcm_buffer + offset 2;\r
	451	\r
	452	if (stereo)\r
cb0316e4	453	{\r
4f265db7	454	for (; len > 0; len--)\r
cb0316e4	455	{\r
4f265db7	456	int lm, rm;\r
	457	lm = mp3_buf++; rm = mp3_buf++;\r
	458	dest_buf++ += lm - lm/2; dest_buf++ += rm - rm/2;\r
cb0316e4	459	}\r
4f265db7	460	} else {\r
4f265db7	461	for (; len > 0; len--)\r
cb0316e4	462	{\r
4f265db7	463	int l = *mp3_buf++;\r
4f265db7	464	*dest_buf++ = l - l/2;\r
cb0316e4	465	}\r
	466	}\r
	467	}\r
4f265db7	468	*/\r
cb0316e4	469	\r
	470	// here we assume that length is different between games, but constant in one game\r
	471	\r
51a902ae	472	static int mp3_samples_ready = 0, mp3_buffer_offs = 0;\r
51a902ae	473	static int mp3_play_bufsel = 0;\r
cb0316e4	474	\r
4f265db7	475	int YM2612UpdateOne_940(int *buffer, int length, int stereo, int is_buf_empty)\r
cc68a136	476	{\r
4f265db7	477	int length_mp3 = Pico.m.pal ? 44100/50 : 44100/60; // mp3s are locked to 44100Hz stereo\r
	478	int *ym_buf = shared_data->mix_buffer;\r
	479	// int *dest_buf = buffer;\r
	480	int cdda_on, mp3_job = 0;\r
	481	// int len;\r
	482	\r
	483	// emulating CD, enabled in opts, not data track, CDC is reading, playback was started, track not ended\r
	484	cdda_on = (PicoMCD & 1) && (PicoOpt & 0x800) && !(Pico_mcd->s68k_regs[0x36] & 1) &&\r
	485	(Pico_mcd->scd.Status_CDC & 1) && loaded_mp3;\r
cc68a136	486	\r
cc68a136	487	//printf("YM2612UpdateOne_940()\n");\r
4f265db7	488	if (/shared_ctl->busy/gp2x_memregs[0x3B3E>>1]) wait_busy_940();\r
cc68a136	489	\r
4f265db7	490	// track ended?\r
4f265db7	491	cdda_on = cdda_on && shared_ctl->mp3_offs < shared_ctl->mp3_len;\r
cc68a136	492	\r
4f265db7	493	// mix in ym buffer\r
	494	if (is_buf_empty) memcpy32(buffer, ym_buf, length<<stereo);\r
	495	// else TODO\r
	496	\r
	497	// for (len = length << stereo; len > 0; len--)\r
	498	// {\r
	499	// dest_buf++ += ym_buf++;\r
	500	// }\r
cb0316e4	501	\r
4f265db7	502	/* mix mp3 data, only stereo */\r
4f265db7	503	if (cdda_on && mp3_samples_ready >= length_mp3)\r
cb0316e4	504	{\r
4f265db7	505	int shr = 0;\r
	506	void (mix_samples)(int dest_buf, short *mp3_buf, int count) = mix_16h_to_32;\r
	507	if (PsndRate == 22050) { mix_samples = mix_16h_to_32_s1; shr = 1; }\r
	508	else if (PsndRate == 11025) { mix_samples = mix_16h_to_32_s2; shr = 2; }\r
cb0316e4	509	\r
4f265db7	510	if (1152 - mp3_buffer_offs >= length_mp3) {\r
	511	mix_samples(buffer, shared_data->mp3_buffer[mp3_play_bufsel] + mp3_buffer_offs*2, (length_mp3>>shr)<<1);\r
	512	\r
	513	mp3_buffer_offs += length_mp3;\r
cb0316e4	514	} else {\r
	515	// collect from both buffers..\r
	516	int left = 1152 - mp3_buffer_offs;\r
4f265db7	517	if (mp3_play_bufsel == 0)\r
	518	{\r
	519	mix_samples(buffer, shared_data->mp3_buffer[0] + mp3_buffer_offs*2, (length_mp3>>shr)<<1);\r
	520	mp3_buffer_offs = length_mp3 - left;\r
	521	mp3_play_bufsel = 1;\r
	522	} else {\r
	523	mix_samples(buffer, shared_data->mp3_buffer[1] + mp3_buffer_offs*2, (left>>shr)<<1);\r
	524	mp3_buffer_offs = length_mp3 - left;\r
	525	mix_samples(buffer + ((left>>shr)<<1),\r
	526	shared_data->mp3_buffer[0], (mp3_buffer_offs>>shr)<<1);\r
	527	mp3_play_bufsel = 0;\r
	528	}\r
cc68a136	529	}\r
4f265db7	530	mp3_samples_ready -= length_mp3;\r
cc68a136	531	}\r
cc68a136	532	\r
cc68a136	533	if (shared_ctl->writebuffsel == 1) {\r
	534	shared_ctl->writebuff0[writebuff_ptr] = 0xffff;\r
	535	} else {\r
	536	shared_ctl->writebuff1[writebuff_ptr] = 0xffff;\r
	537	}\r
	538	writebuff_ptr = 0;\r
	539	\r
7a93adeb	540	/* predict sample counter for next frame */\r
	541	if (PsndLen_exc_add) {\r
	542	if (PsndLen_exc_cnt + PsndLen_exc_add >= 0x10000) length = PsndLen + 1;\r
	543	else length = PsndLen;\r
	544	}\r
	545	\r
cb0316e4	546	/* give 940 ym job */\r
cc68a136	547	shared_ctl->writebuffsel ^= 1;\r
	548	shared_ctl->length = length;\r
	549	shared_ctl->stereo = stereo;\r
cb0316e4	550	\r
cb0316e4	551	// make sure we will have enough mp3 samples next frame\r
4f265db7	552	if (cdda_on && mp3_samples_ready < length_mp3)\r
cb0316e4	553	{\r
	554	shared_ctl->mp3_buffsel ^= 1;\r
	555	mp3_job = JOB940_MP3DECODE;\r
	556	mp3_samples_ready += 1152;\r
	557	}\r
	558	\r
	559	add_job_940(JOB940_YM2612UPDATEONE, mp3_job);\r
cc68a136	560	//spend_cycles(512);\r
	561	//printf("SRCPND: %08lx, INTMODE: %08lx, INTMASK: %08lx, INTPEND: %08lx\n",\r
	562	// gp2x_memregl[0x4500>>2], gp2x_memregl[0x4504>>2], gp2x_memregl[0x4508>>2], gp2x_memregl[0x4510>>2]);\r
4f265db7	563	\r
4f265db7	564	return 1;\r
cc68a136	565	}\r
cb0316e4	566	\r
	567	\r
	568	/***********************************************************/\r
	569	\r
	570	void mp3_start_play(FILE *f, int pos) // pos is 0-1023\r
	571	{\r
	572	int byte_offs = 0;\r
	573	\r
1cd356a3	574	if (!(PicoOpt&0x800)) { // cdda disabled?\r
cb0316e4	575	return;\r
	576	}\r
	577	\r
	578	if (loaded_mp3 != f)\r
	579	{\r
4f265db7	580	// printf("loading mp3... "); fflush(stdout);\r
cb0316e4	581	fseek(f, 0, SEEK_SET);\r
cb0316e4	582	fread(mp3_mem, 1, MP3_SIZE_MAX, f);\r
4f265db7	583	// if (feof(f)) printf("done.\n");\r
4f265db7	584	// else printf("done. mp3 too large, not all data loaded.\n");\r
cb0316e4	585	shared_ctl->mp3_len = ftell(f);\r
	586	loaded_mp3 = f;\r
	587	}\r
	588	\r
	589	// seek..\r
	590	if (pos) {\r
	591	byte_offs = (shared_ctl->mp3_len << 6) >> 10;\r
	592	byte_offs *= pos;\r
	593	byte_offs >>= 6;\r
	594	}\r
4f265db7	595	// printf("mp3 pos1024: %i, byte_offs %i/%i\n", pos, byte_offs, shared_ctl->mp3_len);\r
cb0316e4	596	\r
cb0316e4	597	shared_ctl->mp3_offs = byte_offs;\r
51a902ae	598	\r
	599	// reset buffer pointers..\r
	600	mp3_samples_ready = mp3_buffer_offs = mp3_play_bufsel = 0;\r
	601	shared_ctl->mp3_buffsel = 1; // will change to 0 on first decode\r
cb0316e4	602	}\r
	603	\r
	604	\r
75736070	605	int mp3_get_offset(void)\r
	606	{\r
	607	int offs1024 = 0;\r
	608	int cdda_on;\r
	609	\r
1cd356a3	610	cdda_on = (PicoMCD & 1) && (PicoOpt&0x800) && !(Pico_mcd->s68k_regs[0x36] & 1) &&\r
75736070	611	(Pico_mcd->scd.Status_CDC & 1) && loaded_mp3 && shared_ctl->mp3_offs < shared_ctl->mp3_len;\r
	612	\r
	613	if (cdda_on) {\r
	614	offs1024 = shared_ctl->mp3_offs << 7;\r
	615	offs1024 /= shared_ctl->mp3_len;\r
	616	offs1024 <<= 3;\r
	617	}\r
	618	printf("offs1024=%i (%i/%i)\n", offs1024, shared_ctl->mp3_offs, shared_ctl->mp3_len);\r
	619	\r
	620	return offs1024;\r
	621	}\r
	622	\r
	623	\r