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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> |
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17 | #include <libchdr/chdconfig.h> |
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18 | |
19 | /*************************************************************************** |
20 | CONSTANTS |
21 | ***************************************************************************/ |
22 | |
23 | /* tracks are padded to a multiple of this many frames */ |
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24 | #define CD_TRACK_PADDING (4) |
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25 | #define CD_MAX_TRACKS (99) /* AFAIK the theoretical limit */ |
26 | #define CD_MAX_SECTOR_DATA (2352) |
27 | #define CD_MAX_SUBCODE_DATA (96) |
28 | |
29 | #define CD_FRAME_SIZE (CD_MAX_SECTOR_DATA + CD_MAX_SUBCODE_DATA) |
30 | #define CD_FRAMES_PER_HUNK (8) |
31 | |
32 | #define CD_METADATA_WORDS (1+(CD_MAX_TRACKS * 6)) |
33 | |
34 | enum |
35 | { |
36 | CD_TRACK_MODE1 = 0, /* mode 1 2048 bytes/sector */ |
37 | CD_TRACK_MODE1_RAW, /* mode 1 2352 bytes/sector */ |
38 | CD_TRACK_MODE2, /* mode 2 2336 bytes/sector */ |
39 | CD_TRACK_MODE2_FORM1, /* mode 2 2048 bytes/sector */ |
40 | CD_TRACK_MODE2_FORM2, /* mode 2 2324 bytes/sector */ |
41 | CD_TRACK_MODE2_FORM_MIX, /* mode 2 2336 bytes/sector */ |
42 | CD_TRACK_MODE2_RAW, /* mode 2 2352 bytes / sector */ |
43 | CD_TRACK_AUDIO, /* redbook audio track 2352 bytes/sector (588 samples) */ |
44 | |
45 | CD_TRACK_RAW_DONTCARE /* special flag for cdrom_read_data: just return me whatever is there */ |
46 | }; |
47 | |
48 | enum |
49 | { |
50 | CD_SUB_NORMAL = 0, /* "cooked" 96 bytes per sector */ |
51 | CD_SUB_RAW, /* raw uninterleaved 96 bytes per sector */ |
52 | CD_SUB_NONE /* no subcode data stored */ |
53 | }; |
54 | |
55 | #define CD_FLAG_GDROM 0x00000001 /* disc is a GD-ROM, all tracks should be stored with GD-ROM metadata */ |
56 | #define CD_FLAG_GDROMLE 0x00000002 /* legacy GD-ROM, with little-endian CDDA data */ |
57 | |
58 | /*************************************************************************** |
59 | FUNCTION PROTOTYPES |
60 | ***************************************************************************/ |
61 | |
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62 | #ifdef WANT_RAW_DATA_SECTOR |
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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); |
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67 | #endif |
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68 | |
69 | |
70 | |
71 | /*************************************************************************** |
72 | INLINE FUNCTIONS |
73 | ***************************************************************************/ |
74 | |
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 | |
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 | /** |
95 | * segacd needs it like this.. investigate |
96 | * Angelo also says PCE tracks often start playing at the |
97 | * wrong address.. related? |
98 | **/ |
99 | static inline uint32_t lba_to_msf_alt(int lba) |
100 | { |
101 | uint32_t ret = 0; |
102 | |
103 | ret |= ((lba / (60 * 75))&0xff)<<16; |
104 | ret |= (((lba / 75) % 60)&0xff)<<8; |
105 | ret |= ((lba % 75)&0xff)<<0; |
106 | |
107 | return ret; |
108 | } |
109 | |
110 | #endif /* __CDROM_H__ */ |