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// license:BSD-3-Clause
// copyright-holders:Aaron Giles
/***************************************************************************
cdrom.h
Generic MAME cd-rom implementation
***************************************************************************/
#pragma once
#ifndef __CDROM_H__
#define __CDROM_H__
#include <stdint.h>
/***************************************************************************
CONSTANTS
***************************************************************************/
// tracks are padded to a multiple of this many frames
extern const uint32_t CD_TRACK_PADDING;
#define CD_MAX_TRACKS (99) /* AFAIK the theoretical limit */
#define CD_MAX_SECTOR_DATA (2352)
#define CD_MAX_SUBCODE_DATA (96)
#define CD_FRAME_SIZE (CD_MAX_SECTOR_DATA + CD_MAX_SUBCODE_DATA)
#define CD_FRAMES_PER_HUNK (8)
#define CD_METADATA_WORDS (1+(CD_MAX_TRACKS * 6))
enum
{
CD_TRACK_MODE1 = 0, /* mode 1 2048 bytes/sector */
CD_TRACK_MODE1_RAW, /* mode 1 2352 bytes/sector */
CD_TRACK_MODE2, /* mode 2 2336 bytes/sector */
CD_TRACK_MODE2_FORM1, /* mode 2 2048 bytes/sector */
CD_TRACK_MODE2_FORM2, /* mode 2 2324 bytes/sector */
CD_TRACK_MODE2_FORM_MIX, /* mode 2 2336 bytes/sector */
CD_TRACK_MODE2_RAW, /* mode 2 2352 bytes / sector */
CD_TRACK_AUDIO, /* redbook audio track 2352 bytes/sector (588 samples) */
CD_TRACK_RAW_DONTCARE /* special flag for cdrom_read_data: just return me whatever is there */
};
enum
{
CD_SUB_NORMAL = 0, /* "cooked" 96 bytes per sector */
CD_SUB_RAW, /* raw uninterleaved 96 bytes per sector */
CD_SUB_NONE /* no subcode data stored */
};
#define CD_FLAG_GDROM 0x00000001 // disc is a GD-ROM, all tracks should be stored with GD-ROM metadata
#define CD_FLAG_GDROMLE 0x00000002 // legacy GD-ROM, with little-endian CDDA data
/***************************************************************************
FUNCTION PROTOTYPES
***************************************************************************/
// ECC utilities
int ecc_verify(const uint8_t *sector);
void ecc_generate(uint8_t *sector);
void ecc_clear(uint8_t *sector);
/***************************************************************************
INLINE FUNCTIONS
***************************************************************************/
static inline uint32_t msf_to_lba(uint32_t msf)
{
return ( ((msf&0x00ff0000)>>16) * 60 * 75) + (((msf&0x0000ff00)>>8) * 75) + ((msf&0x000000ff)>>0);
}
static inline uint32_t lba_to_msf(uint32_t lba)
{
uint8_t m, s, f;
m = lba / (60 * 75);
lba -= m * (60 * 75);
s = lba / 75;
f = lba % 75;
return ((m / 10) << 20) | ((m % 10) << 16) |
((s / 10) << 12) | ((s % 10) << 8) |
((f / 10) << 4) | ((f % 10) << 0);
}
// segacd needs it like this.. investigate
// Angelo also says PCE tracks often start playing at the
// wrong address.. related?
static inline uint32_t lba_to_msf_alt(int lba)
{
uint32_t ret = 0;
ret |= ((lba / (60 * 75))&0xff)<<16;
ret |= (((lba / 75) % 60)&0xff)<<8;
ret |= ((lba % 75)&0xff)<<0;
return ret;
}
#endif // __CDROM_H__
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