1 // license:BSD-3-Clause
2 // copyright-holders:Aaron Giles
3 /***************************************************************************
4
5 cdrom.h
6
7 Generic MAME cd-rom implementation
8
9 ***************************************************************************/
10
11 #pragma once
12
13 #ifndef __CDROM_H__
14 #define __CDROM_H__
15
16 #include <stdint.h>
17
18 #include <retro_inline.h>
19
20 /***************************************************************************
21 CONSTANTS
22 ***************************************************************************/
23
24 // tracks are padded to a multiple of this many frames
25 extern const uint32_t CD_TRACK_PADDING;
26
27 #define CD_MAX_TRACKS (99) /* AFAIK the theoretical limit */
28 #define CD_MAX_SECTOR_DATA (2352)
29 #define CD_MAX_SUBCODE_DATA (96)
30
31 #define CD_FRAME_SIZE (CD_MAX_SECTOR_DATA + CD_MAX_SUBCODE_DATA)
32 #define CD_FRAMES_PER_HUNK (8)
33
34 #define CD_METADATA_WORDS (1+(CD_MAX_TRACKS * 6))
35
36 enum
37 {
38 CD_TRACK_MODE1 = 0, /* mode 1 2048 bytes/sector */
39 CD_TRACK_MODE1_RAW, /* mode 1 2352 bytes/sector */
40 CD_TRACK_MODE2, /* mode 2 2336 bytes/sector */
41 CD_TRACK_MODE2_FORM1, /* mode 2 2048 bytes/sector */
42 CD_TRACK_MODE2_FORM2, /* mode 2 2324 bytes/sector */
43 CD_TRACK_MODE2_FORM_MIX, /* mode 2 2336 bytes/sector */
44 CD_TRACK_MODE2_RAW, /* mode 2 2352 bytes / sector */
45 CD_TRACK_AUDIO, /* redbook audio track 2352 bytes/sector (588 samples) */
46
47 CD_TRACK_RAW_DONTCARE /* special flag for cdrom_read_data: just return me whatever is there */
48 };
49
50 enum
51 {
52 CD_SUB_NORMAL = 0, /* "cooked" 96 bytes per sector */
53 CD_SUB_RAW, /* raw uninterleaved 96 bytes per sector */
54 CD_SUB_NONE /* no subcode data stored */
55 };
56
57 #define CD_FLAG_GDROM 0x00000001 // disc is a GD-ROM, all tracks should be stored with GD-ROM metadata
58 #define CD_FLAG_GDROMLE 0x00000002 // legacy GD-ROM, with little-endian CDDA data
59
60 /***************************************************************************
61 FUNCTION PROTOTYPES
62 ***************************************************************************/
63
64 // ECC utilities
65 int ecc_verify(const uint8_t *sector);
66 void ecc_generate(uint8_t *sector);
67 void ecc_clear(uint8_t *sector);
68
69
70
71 /***************************************************************************
72 INLINE FUNCTIONS
73 ***************************************************************************/
74
msf_to_lba(uint32_t msf)75 static INLINE uint32_t msf_to_lba(uint32_t msf)
76 {
77 return ( ((msf&0x00ff0000)>>16) * 60 * 75) + (((msf&0x0000ff00)>>8) * 75) + ((msf&0x000000ff)>>0);
78 }
79
lba_to_msf(uint32_t lba)80 static INLINE uint32_t lba_to_msf(uint32_t lba)
81 {
82 uint8_t m, s, f;
83
84 m = lba / (60 * 75);
85 lba -= m * (60 * 75);
86 s = lba / 75;
87 f = lba % 75;
88
89 return ((m / 10) << 20) | ((m % 10) << 16) |
90 ((s / 10) << 12) | ((s % 10) << 8) |
91 ((f / 10) << 4) | ((f % 10) << 0);
92 }
93
94 // segacd needs it like this.. investigate
95 // Angelo also says PCE tracks often start playing at the
96 // wrong address.. related?
lba_to_msf_alt(int lba)97 static INLINE uint32_t lba_to_msf_alt(int lba)
98 {
99 uint32_t ret = 0;
100
101 ret |= ((lba / (60 * 75))&0xff)<<16;
102 ret |= (((lba / 75) % 60)&0xff)<<8;
103 ret |= ((lba % 75)&0xff)<<0;
104
105 return ret;
106 }
107
108 #endif // __CDROM_H__
109