| 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__ */ |