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