9c659ffe |
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 | |
19 | /*************************************************************************** |
20 | CONSTANTS |
21 | ***************************************************************************/ |
22 | |
23 | /* tracks are padded to a multiple of this many frames */ |
24 | extern const uint32_t CD_TRACK_PADDING; |
25 | |
26 | #define CD_MAX_TRACKS (99) /* AFAIK the theoretical limit */ |
27 | #define CD_MAX_SECTOR_DATA (2352) |
28 | #define CD_MAX_SUBCODE_DATA (96) |
29 | |
30 | #define CD_FRAME_SIZE (CD_MAX_SECTOR_DATA + CD_MAX_SUBCODE_DATA) |
31 | #define CD_FRAMES_PER_HUNK (8) |
32 | |
33 | #define CD_METADATA_WORDS (1+(CD_MAX_TRACKS * 6)) |
34 | |
35 | enum |
36 | { |
37 | CD_TRACK_MODE1 = 0, /* mode 1 2048 bytes/sector */ |
38 | CD_TRACK_MODE1_RAW, /* mode 1 2352 bytes/sector */ |
39 | CD_TRACK_MODE2, /* mode 2 2336 bytes/sector */ |
40 | CD_TRACK_MODE2_FORM1, /* mode 2 2048 bytes/sector */ |
41 | CD_TRACK_MODE2_FORM2, /* mode 2 2324 bytes/sector */ |
42 | CD_TRACK_MODE2_FORM_MIX, /* mode 2 2336 bytes/sector */ |
43 | CD_TRACK_MODE2_RAW, /* mode 2 2352 bytes / sector */ |
44 | CD_TRACK_AUDIO, /* redbook audio track 2352 bytes/sector (588 samples) */ |
45 | |
46 | CD_TRACK_RAW_DONTCARE /* special flag for cdrom_read_data: just return me whatever is there */ |
47 | }; |
48 | |
49 | enum |
50 | { |
51 | CD_SUB_NORMAL = 0, /* "cooked" 96 bytes per sector */ |
52 | CD_SUB_RAW, /* raw uninterleaved 96 bytes per sector */ |
53 | CD_SUB_NONE /* no subcode data stored */ |
54 | }; |
55 | |
56 | #define CD_FLAG_GDROM 0x00000001 /* disc is a GD-ROM, all tracks should be stored with GD-ROM metadata */ |
57 | #define CD_FLAG_GDROMLE 0x00000002 /* legacy GD-ROM, with little-endian CDDA data */ |
58 | |
59 | /*************************************************************************** |
60 | FUNCTION PROTOTYPES |
61 | ***************************************************************************/ |
62 | |
63 | /* ECC utilities */ |
64 | int ecc_verify(const uint8_t *sector); |
65 | void ecc_generate(uint8_t *sector); |
66 | void ecc_clear(uint8_t *sector); |
67 | |
68 | |
69 | |
70 | /*************************************************************************** |
71 | INLINE FUNCTIONS |
72 | ***************************************************************************/ |
73 | |
74 | static inline uint32_t msf_to_lba(uint32_t msf) |
75 | { |
76 | return ( ((msf&0x00ff0000)>>16) * 60 * 75) + (((msf&0x0000ff00)>>8) * 75) + ((msf&0x000000ff)>>0); |
77 | } |
78 | |
79 | static inline uint32_t lba_to_msf(uint32_t lba) |
80 | { |
81 | uint8_t m, s, f; |
82 | |
83 | m = lba / (60 * 75); |
84 | lba -= m * (60 * 75); |
85 | s = lba / 75; |
86 | f = lba % 75; |
87 | |
88 | return ((m / 10) << 20) | ((m % 10) << 16) | |
89 | ((s / 10) << 12) | ((s % 10) << 8) | |
90 | ((f / 10) << 4) | ((f % 10) << 0); |
91 | } |
92 | |
93 | /** |
94 | * segacd needs it like this.. investigate |
95 | * Angelo also says PCE tracks often start playing at the |
96 | * wrong address.. related? |
97 | **/ |
98 | static inline uint32_t lba_to_msf_alt(int lba) |
99 | { |
100 | uint32_t ret = 0; |
101 | |
102 | ret |= ((lba / (60 * 75))&0xff)<<16; |
103 | ret |= (((lba / 75) % 60)&0xff)<<8; |
104 | ret |= ((lba % 75)&0xff)<<0; |
105 | |
106 | return ret; |
107 | } |
108 | |
109 | #endif /* __CDROM_H__ */ |