235 lines
6.7 KiB
C++
235 lines
6.7 KiB
C++
#ifndef __MDFN_CDROM_CDUTILITY_H
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#define __MDFN_CDROM_CDUTILITY_H
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namespace CDUtility
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{
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// Call once at app startup before creating any threads that could potentially cause re-entrancy to these functions.
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// It will also be called automatically if needed for the first time a function in this namespace that requires
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// the initialization function to be called is called, for potential
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// usage in constructors of statically-declared objects.
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void CDUtility_Init(void);
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// Quick definitions here:
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//
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// ABA - Absolute block address, synonymous to absolute MSF
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// aba = (m_a * 60 * 75) + (s_a * 75) + f_a
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//
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// LBA - Logical block address(related: data CDs are required to have a pregap of 2 seconds, IE 150 frames/sectors)
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// lba = aba - 150
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enum
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{
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ADR_NOQINFO = 0x00,
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ADR_CURPOS = 0x01,
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ADR_MCN = 0x02,
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ADR_ISRC = 0x03
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};
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struct TOC_Track
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{
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uint8 adr;
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uint8 control;
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uint32 lba;
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bool valid; // valid/present; oh CD-i...
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};
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// SubQ control field flags.
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enum
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{
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SUBQ_CTRLF_PRE = 0x01, // With 50/15us pre-emphasis.
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SUBQ_CTRLF_DCP = 0x02, // Digital copy permitted.
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SUBQ_CTRLF_DATA = 0x04, // Data track.
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SUBQ_CTRLF_4CH = 0x08, // 4-channel CD-DA.
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};
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enum
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{
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DISC_TYPE_CDDA_OR_M1 = 0x00,
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DISC_TYPE_CD_I = 0x10,
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DISC_TYPE_CD_XA = 0x20
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};
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struct TOC
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{
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INLINE TOC()
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{
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Clear();
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}
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INLINE void Clear(void)
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{
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first_track = last_track = 0;
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disc_type = 0;
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memset(tracks, 0, sizeof(tracks)); // FIXME if we change TOC_Track to non-POD type.
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}
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INLINE int FindTrackByLBA(uint32 LBA) const
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{
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int32 lvt = 0;
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for(int32 track = 1; track <= 100; track++)
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{
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if(!tracks[track].valid)
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continue;
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if(LBA < tracks[track].lba)
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break;
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lvt = track;
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}
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return(lvt);
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}
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uint8 first_track;
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uint8 last_track;
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uint8 disc_type;
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TOC_Track tracks[100 + 1]; // [0] is unused, [100] is for the leadout track.
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};
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//
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// Address conversion functions.
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//
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static INLINE uint32 AMSF_to_ABA(int32 m_a, int32 s_a, int32 f_a)
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{
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return(f_a + 75 * s_a + 75 * 60 * m_a);
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}
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static INLINE void ABA_to_AMSF(uint32 aba, uint8 *m_a, uint8 *s_a, uint8 *f_a)
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{
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*m_a = aba / 75 / 60;
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*s_a = (aba - *m_a * 75 * 60) / 75;
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*f_a = aba - (*m_a * 75 * 60) - (*s_a * 75);
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}
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static INLINE int32 ABA_to_LBA(uint32 aba)
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{
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return(aba - 150);
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}
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static INLINE uint32 LBA_to_ABA(int32 lba)
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{
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return(lba + 150);
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}
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static INLINE int32 AMSF_to_LBA(uint8 m_a, uint8 s_a, uint8 f_a)
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{
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return(ABA_to_LBA(AMSF_to_ABA(m_a, s_a, f_a)));
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}
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static INLINE void LBA_to_AMSF(int32 lba, uint8 *m_a, uint8 *s_a, uint8 *f_a)
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{
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ABA_to_AMSF(LBA_to_ABA(lba), m_a, s_a, f_a);
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}
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//
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// BCD conversion functions
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//
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static INLINE bool BCD_is_valid(uint8 bcd_number)
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{
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if((bcd_number & 0xF0) >= 0xA0)
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return(false);
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if((bcd_number & 0x0F) >= 0x0A)
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return(false);
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return(true);
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}
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static INLINE uint8 BCD_to_U8(uint8 bcd_number)
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{
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return( ((bcd_number >> 4) * 10) + (bcd_number & 0x0F) );
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}
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static INLINE uint8 U8_to_BCD(uint8 num)
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{
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return( ((num / 10) << 4) + (num % 10) );
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}
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// should always perform the conversion, even if the bcd number is invalid.
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static INLINE bool BCD_to_U8_check(uint8 bcd_number, uint8 *out_number)
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{
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*out_number = BCD_to_U8(bcd_number);
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if(!BCD_is_valid(bcd_number))
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return(false);
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return(true);
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}
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//
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// Sector data encoding functions(to full 2352 bytes raw sector).
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//
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// sector_data must be able to contain at least 2352 bytes.
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void encode_mode0_sector(uint32 aba, uint8 *sector_data);
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void encode_mode1_sector(uint32 aba, uint8 *sector_data); // 2048 bytes of user data at offset 16
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void encode_mode2_sector(uint32 aba, uint8 *sector_data); // 2336 bytes of user data at offset 16
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void encode_mode2_form1_sector(uint32 aba, uint8 *sector_data); // 2048+8 bytes of user data at offset 16
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void encode_mode2_form2_sector(uint32 aba, uint8 *sector_data); // 2324+8 bytes of user data at offset 16
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// User data area pre-pause(MSF 00:00:00 through 00:01:74), lba -150 through -1
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// out_buf must be able to contain 2352+96 bytes.
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// "mode" is not used if the area is to be encoded as audio.
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// pass 0xFF for "mode" for "don't know", and to make guess based on the TOC.
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void synth_udapp_sector_lba(uint8 mode, const TOC& toc, const int32 lba, int32 lba_subq_relative_offs, uint8* out_buf);
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void subpw_synth_udapp_lba(const TOC& toc, const int32 lba, const int32 lba_subq_relative_offs, uint8* SubPWBuf);
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// out_buf must be able to contain 2352+96 bytes.
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// "mode" is not used if the area is to be encoded as audio.
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// pass 0xFF for "mode" for "don't know", and to make guess based on the TOC.
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void synth_leadout_sector_lba(uint8 mode, const TOC& toc, const int32 lba, uint8* out_buf);
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void subpw_synth_leadout_lba(const TOC& toc, const int32 lba, uint8* SubPWBuf);
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//
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// User data error detection and correction
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//
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// Check EDC of a mode 1 or mode 2 form 1 sector.
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// Returns "true" if checksum is ok(matches).
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// Returns "false" if checksum mismatch.
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// sector_data should contain 2352 bytes of raw sector data.
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bool edc_check(const uint8 *sector_data, bool xa);
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// Check EDC and L-EC data of a mode 1 or mode 2 form 1 sector, and correct bit errors if any exist.
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// Returns "true" if errors weren't detected, or they were corrected succesfully.
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// Returns "false" if errors couldn't be corrected.
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// sector_data should contain 2352 bytes of raw sector data.
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bool edc_lec_check_and_correct(uint8 *sector_data, bool xa);
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//
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// Subchannel(Q in particular) functions
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//
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// Returns false on checksum mismatch, true on match.
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bool subq_check_checksum(const uint8 *subq_buf);
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// Calculates the checksum of Q subchannel data(not including the checksum bytes of course ;)) from subq_buf, and stores it into the appropriate position
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// in subq_buf.
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void subq_generate_checksum(uint8 *subq_buf);
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// Deinterleaves 12 bytes of subchannel Q data from 96 bytes of interleaved subchannel PW data.
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void subq_deinterleave(const uint8 *subpw_buf, uint8 *subq_buf);
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// Deinterleaves 96 bytes of subchannel P-W data from 96 bytes of interleaved subchannel PW data.
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void subpw_deinterleave(const uint8 *in_buf, uint8 *out_buf);
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// Interleaves 96 bytes of subchannel P-W data from 96 bytes of uninterleaved subchannel PW data.
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void subpw_interleave(const uint8 *in_buf, uint8 *out_buf);
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// Extrapolates Q subchannel current position data from subq_input, with frame/sector delta position_delta, and writes to subq_output.
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// Only valid for ADR_CURPOS.
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// subq_input must pass subq_check_checksum().
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// TODO
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//void subq_extrapolate(const uint8 *subq_input, int32 position_delta, uint8 *subq_output);
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// (De)Scrambles data sector.
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void scrambleize_data_sector(uint8 *sector_data);
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}
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#endif
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