[picodrive.git] / Pico / cd / buffering.c

// Buffering handling
// (c) Copyright 2007, Grazvydas "notaz" Ignotas

#include "../PicoInt.h"

//#include <stdlib.h>

int PicoCDBuffers = 0;
static unsigned char *cd_buffer = NULL;
static int prev_lba = 0x80000000;

static int hits, reads;


void PicoCDBufferInit(void)
{
	void *tmp;

	prev_lba = 0x80000000;
	hits = reads = 0;

	if (PicoCDBuffers <= 1) {
		PicoCDBuffers = 0;
		return; /* buffering off */
	}

	/* try alloc'ing until we succeed */
	while (PicoCDBuffers > 0)
	{
		tmp = realloc(cd_buffer, PicoCDBuffers * 2048);
		if (tmp != NULL) break;
		PicoCDBuffers >>= 1;
	}

	if (PicoCDBuffers <= 0) return; /* buffering became off */

	cd_buffer = tmp;
}


void PicoCDBufferFree(void)
{
	if (cd_buffer) {
		free(cd_buffer);
		cd_buffer = NULL;
	}
	if (reads)
		printf("CD buffer hits: %i/%i (%i%%)\n", hits, reads, hits * 100 / reads);
}


/* this is a try to fight slow SD access of GP2X */
PICO_INTERNAL void PicoCDBufferRead(void *dest, int lba)
{
	int is_bin, offs, read_len, moved = 0;
	reads++;

	is_bin = Pico_mcd->TOC.Tracks[0].ftype == TYPE_BIN;

	if (PicoCDBuffers <= 0)
	{
		/* no buffering */
		int where_seek = is_bin ? (lba * 2352 + 16) : (lba << 11);
		pm_seek(Pico_mcd->TOC.Tracks[0].F, where_seek, SEEK_SET);
		pm_read(dest, 2048, Pico_mcd->TOC.Tracks[0].F);
		return;
	}

	/* hit? */
	offs = lba - prev_lba;
	if (offs >= 0 && offs < PicoCDBuffers)
	{
		hits++;
		if (offs == 0) dprintf("CD buffer seek to old %i -> %i\n", prev_lba, lba);
		memcpy32(dest, (int *)(cd_buffer + offs*2048), 2048/4);
		return;
	}

	if (prev_lba + PicoCDBuffers != lba)
	{
		int where_seek = is_bin ? (lba * 2352 + 16) : (lba << 11);
		dprintf("CD buffer seek %i -> %i\n", prev_lba, lba);
		pm_seek(Pico_mcd->TOC.Tracks[0].F, where_seek, SEEK_SET);
	}

	dprintf("CD buffer miss %i -> %i\n", prev_lba, lba);

	if (lba < prev_lba && prev_lba - lba < PicoCDBuffers)
	{
		read_len = prev_lba - lba;
		dprintf("CD buffer move=%i, read_len=%i", PicoCDBuffers - read_len, read_len);
		memmove(cd_buffer + read_len*2048, cd_buffer, (PicoCDBuffers - read_len)*2048);
		moved = 1;
	}
	else
	{
		read_len = PicoCDBuffers;
	}

	if (PicoMessage != NULL && read_len >= 512)
	{
		PicoMessage("Buffering data...");
	}

	if (is_bin)
	{
		int i;
		for (i = 0; i < read_len; i++)
		{
			pm_read(cd_buffer + i*2048, 2048, Pico_mcd->TOC.Tracks[0].F);
			pm_seek(Pico_mcd->TOC.Tracks[0].F, 304, SEEK_CUR);
		}
	}
	else
	{
		pm_read(cd_buffer, read_len*2048, Pico_mcd->TOC.Tracks[0].F);
	}
	memcpy32(dest, (int *) cd_buffer, 2048/4);
	prev_lba = lba;

	if (moved)
	{
		/* file pointer must point to the same data in file, as would-be data after our buffer */
		int where_seek;
		lba += PicoCDBuffers;
		where_seek = is_bin ? (lba * 2352 + 16) : (lba << 11);
		pm_seek(Pico_mcd->TOC.Tracks[0].F, where_seek, SEEK_SET);
	}
}
Commit	Line	Data
6cadc2da	1	// Buffering handling
	2	// (c) Copyright 2007, Grazvydas "notaz" Ignotas
	3
8b71d0eb	4	#include "../PicoInt.h"
	5
	6	//#include <stdlib.h>
	7
	8	int PicoCDBuffers = 0;
	9	static unsigned char *cd_buffer = NULL;
	10	static int prev_lba = 0x80000000;
	11
	12	static int hits, reads;
	13
	14
	15	void PicoCDBufferInit(void)
	16	{
	17	void *tmp;
	18
	19	prev_lba = 0x80000000;
	20	hits = reads = 0;
	21
	22	if (PicoCDBuffers <= 1) {
	23	PicoCDBuffers = 0;
	24	return; /* buffering off */
	25	}
	26
	27	/* try alloc'ing until we succeed */
	28	while (PicoCDBuffers > 0)
	29	{
	30	tmp = realloc(cd_buffer, PicoCDBuffers * 2048);
	31	if (tmp != NULL) break;
	32	PicoCDBuffers >>= 1;
	33	}
	34
	35	if (PicoCDBuffers <= 0) return; /* buffering became off */
	36
	37	cd_buffer = tmp;
	38	}
	39
	40
	41	void PicoCDBufferFree(void)
	42	{
	43	if (cd_buffer) {
	44	free(cd_buffer);
	45	cd_buffer = NULL;
	46	}
	47	if (reads)
	48	printf("CD buffer hits: %i/%i (%i%%)\n", hits, reads, hits * 100 / reads);
	49	}
	50
	51
	52	/* this is a try to fight slow SD access of GP2X */
eff55556	53	PICO_INTERNAL void PicoCDBufferRead(void *dest, int lba)
8b71d0eb	54	{
66fdc0f0	55	int is_bin, offs, read_len, moved = 0;
8b71d0eb	56	reads++;
	57
	58	is_bin = Pico_mcd->TOC.Tracks[0].ftype == TYPE_BIN;
	59
	60	if (PicoCDBuffers <= 0)
	61	{
	62	/* no buffering */
	63	int where_seek = is_bin ? (lba * 2352 + 16) : (lba << 11);
	64	pm_seek(Pico_mcd->TOC.Tracks[0].F, where_seek, SEEK_SET);
	65	pm_read(dest, 2048, Pico_mcd->TOC.Tracks[0].F);
	66	return;
	67	}
	68
	69	/* hit? */
	70	offs = lba - prev_lba;
	71	if (offs >= 0 && offs < PicoCDBuffers)
	72	{
	73	hits++;
	74	if (offs == 0) dprintf("CD buffer seek to old %i -> %i\n", prev_lba, lba);
	75	memcpy32(dest, (int )(cd_buffer + offs2048), 2048/4);
	76	return;
	77	}
	78
	79	if (prev_lba + PicoCDBuffers != lba)
	80	{
	81	int where_seek = is_bin ? (lba * 2352 + 16) : (lba << 11);
	82	dprintf("CD buffer seek %i -> %i\n", prev_lba, lba);
	83	pm_seek(Pico_mcd->TOC.Tracks[0].F, where_seek, SEEK_SET);
	84	}
	85
	86	dprintf("CD buffer miss %i -> %i\n", prev_lba, lba);
	87
	88	if (lba < prev_lba && prev_lba - lba < PicoCDBuffers)
	89	{
8b71d0eb	90	read_len = prev_lba - lba;
66fdc0f0	91	dprintf("CD buffer move=%i, read_len=%i", PicoCDBuffers - read_len, read_len);
8b71d0eb	92	memmove(cd_buffer + read_len2048, cd_buffer, (PicoCDBuffers - read_len)2048);
66fdc0f0	93	moved = 1;
8b71d0eb	94	}
	95	else
	96	{
	97	read_len = PicoCDBuffers;
	98	}
	99
66fdc0f0	100	if (PicoMessage != NULL && read_len >= 512)
	101	{
	102	PicoMessage("Buffering data...");
	103	}
	104
8b71d0eb	105	if (is_bin)
	106	{
	107	int i;
	108	for (i = 0; i < read_len; i++)
	109	{
	110	pm_read(cd_buffer + i*2048, 2048, Pico_mcd->TOC.Tracks[0].F);
	111	pm_seek(Pico_mcd->TOC.Tracks[0].F, 304, SEEK_CUR);
	112	}
	113	}
	114	else
	115	{
	116	pm_read(cd_buffer, read_len*2048, Pico_mcd->TOC.Tracks[0].F);
	117	}
	118	memcpy32(dest, (int *) cd_buffer, 2048/4);
	119	prev_lba = lba;
66fdc0f0	120
	121	if (moved)
	122	{
	123	/* file pointer must point to the same data in file, as would-be data after our buffer */
	124	int where_seek;
	125	lba += PicoCDBuffers;
	126	where_seek = is_bin ? (lba * 2352 + 16) : (lba << 11);
	127	pm_seek(Pico_mcd->TOC.Tracks[0].F, where_seek, SEEK_SET);
	128	}
8b71d0eb	129	}
8b71d0eb	130