mirror of
https://github.com/bsnes-emu/bsnes.git
synced 2025-08-26 04:44:21 +02:00
Update to bsnes v107r4 beta release.
byuu says:
- bsnes: added video filters from bsnes v082
- bsnes: added ZSNES snow effect option when games paused or unloaded
(no, I'm not joking)
- bsnes: added 7-zip support (LZMA 19.00 SDK)
[Recent higan WIPs have also mentioned bsnes changes, although the higan code
no longer includes the bsnes code. These changes include:
- higan, bsnes: added EXLOROM, EXLOROM-RAM, EXHIROM mappings
- higan, bsnes: focus the viewport after leaving fullscreen exclusive
mode
- bsnes: re-added mightymo's cheat code database
- bsnes: improved make install rules for the game and cheat code
databases
- bsnes: delayed construction of hiro::Window objects to properly show
bsnes window icons
- Ed.]
This commit is contained in:
Tim Allen
478
nall/cd/session.hpp
Normal file
478
nall/cd/session.hpp
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@@ -0,0 +1,478 @@
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#pragma once
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//subchannel processor
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//note: this code is not tolerant to subchannel data that violates the Redbook standard
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namespace nall::CD {
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enum : int { InvalidLBA = 100 * 60 * 75 };
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struct BCD {
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static auto encode(uint8_t value) -> uint8_t { return value / 10 << 4 | value % 10; }
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static auto decode(uint8_t value) -> uint8_t { return (value >> 4) * 10 + (value & 15); }
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};
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struct MSF {
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uint8_t minute; //00-99
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uint8_t second; //00-59
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uint8_t frame = -1; //00-74
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MSF() = default;
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MSF(uint8_t m, uint8_t s, uint8_t f) : minute(m), second(s), frame(f) {}
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MSF(int lba) { *this = fromLBA(lba); }
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explicit operator bool() const {
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return minute <= 99 && second <= 59 && frame <= 74;
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}
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static auto fromBCD(uint8_t minute, uint8_t second, uint8_t frame) -> MSF {
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return {BCD::decode(minute), BCD::decode(second), BCD::decode(frame)};
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}
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static auto fromLBA(int lba) -> MSF {
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if(lba < 0) lba = 100 * 60 * 75 + lba;
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if(lba >= 100 * 60 * 75) return {};
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uint8_t minute = lba / 75 / 60 % 100;
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uint8_t second = lba / 75 % 60;
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uint8_t frame = lba % 75;
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return {minute, second, frame};
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}
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auto toLBA() const -> int {
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int lba = minute * 60 * 75 + second * 75 + frame;
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if(minute < 90) return lba;
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return -(100 * 60 * 75 - lba);
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}
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//for debugging purposes
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auto toString() const -> string {
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if(!operator bool()) return "??:??:??";
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return {pad(minute, 2, '0'), ":", pad(second, 2, '0'), ":", pad(frame, 2, '0')};
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}
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};
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struct Index {
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int lba = InvalidLBA;
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int end = InvalidLBA; //inclusive range
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explicit operator bool() const {
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return lba != InvalidLBA;
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}
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auto inRange(int sector) const -> bool {
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if(lba == InvalidLBA || end == InvalidLBA) return false;
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return sector >= lba && sector <= end;
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}
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};
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struct Track {
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uint8_t control = 0b1111; //4-bit
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uint8_t address = 0b1111; //4-bit
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Index indices[100];
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uint8_t firstIndex = -1;
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uint8_t lastIndex = -1;
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explicit operator bool() const {
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return (bool)indices[1];
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}
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auto emphasis() const -> bool {
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return control & 1;
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}
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auto copyable() const -> bool {
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return control & 2;
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}
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auto channels() const -> uint {
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if((control & 0b1100) == 0b0000) return 2;
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if((control & 0b1100) == 0b1000) return 4;
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return 0; //data track or reserved
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}
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auto pregap() const -> int {
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if(!indices[0] || !indices[1]) return InvalidLBA;
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return indices[1].lba - indices[0].lba;
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}
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auto isAudio() const -> bool {
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return channels() != 0;
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}
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auto isData() const -> bool {
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return (control & 0b1100) == 0b0100;
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}
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auto inIndex(int lba) const -> maybe<uint8_t> {
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for(uint8_t index : range(100)) {
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if(indices[index].inRange(lba)) return index;
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}
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return {};
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}
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auto inRange(int lba) const -> bool {
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if(firstIndex > 99 || lastIndex > 99) return false;
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return lba >= indices[firstIndex].lba && lba <= indices[lastIndex].end;
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}
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};
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struct Session {
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Index leadIn; //00
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Track tracks[100]; //01-99
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Index leadOut; //aa
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uint8_t firstTrack = -1;
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uint8_t lastTrack = -1;
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auto inLeadIn(int lba) const -> bool {
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return lba < 0;
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}
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auto inTrack(int lba) const -> maybe<uint8_t> {
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for(uint8_t trackID : range(100)) {
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auto& track = tracks[trackID];
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if(track && track.inRange(lba)) return trackID;
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}
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return {};
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}
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auto inLeadOut(int lba) const -> bool {
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return lba >= leadOut.lba;
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}
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auto encode(uint sectors) const -> vector<uint8_t> {
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if(sectors < abs(leadIn.lba) + leadOut.lba) return {}; //not enough sectors
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vector<uint8_t> data;
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data.resize(sectors * 96 + 96); //add one sector for P shift
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auto toP = [&](int lba) -> array_span<uint8_t> {
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//P is encoded one sector later than Q
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return {&data[(lba + abs(leadIn.lba) + 1) * 96], 12};
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};
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auto toQ = [&](int lba) -> array_span<uint8_t> {
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return {&data[(lba + abs(leadIn.lba)) * 96 + 12], 12};
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};
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//lead-in
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int lba = leadIn.lba;
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while(lba < 0) {
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//tracks
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for(uint trackID : range(100)) {
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for(uint repeat : range(3)) {
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auto& track = tracks[trackID];
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if(!track) continue;
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auto q = toQ(lba);
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q[0] = track.control << 4 | track.address << 0;
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q[1] = 0x00;
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q[2] = BCD::encode(trackID);
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auto msf = MSF(lba);
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q[3] = BCD::encode(msf.minute);
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q[4] = BCD::encode(msf.second);
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q[5] = BCD::encode(msf.frame);
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q[6] = 0x00;
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msf = MSF(track.indices[1].lba);
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q[7] = BCD::encode(msf.minute);
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q[8] = BCD::encode(msf.second);
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q[9] = BCD::encode(msf.frame);
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auto crc16 = CRC16({q, 10});
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q[10] = crc16 >> 8;
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q[11] = crc16 >> 0;
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if(++lba >= 0) break;
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}}if( lba >= 0) break;
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//first track
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for(uint repeat : range(3)) {
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auto q = toQ(lba);
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q[0] = 0x01; //control value unverified; address = 1
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q[1] = 0x00; //track# = 00 (TOC)
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q[2] = 0xa0; //first track
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auto msf = MSF(lba);
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q[3] = BCD::encode(msf.minute);
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q[4] = BCD::encode(msf.second);
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q[5] = BCD::encode(msf.frame);
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q[6] = 0x00;
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q[7] = BCD::encode(firstTrack);
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q[8] = 0x00;
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q[9] = 0x00;
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auto crc16 = CRC16({q, 10});
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q[10] = crc16 >> 8;
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q[11] = crc16 >> 0;
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if(++lba >= 0) break;
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} if( lba >= 0) break;
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//last track
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for(uint repeat : range(3)) {
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auto q = toQ(lba);
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q[0] = 0x01;
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q[1] = 0x00;
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q[2] = 0xa1; //last track
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auto msf = MSF(lba);
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q[3] = BCD::encode(msf.minute);
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q[4] = BCD::encode(msf.second);
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q[5] = BCD::encode(msf.frame);
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q[6] = 0x00;
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q[7] = BCD::encode(lastTrack);
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q[8] = 0x00;
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q[9] = 0x00;
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auto crc16 = CRC16({q, 10});
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q[10] = crc16 >> 8;
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q[11] = crc16 >> 0;
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if(++lba >= 0) break;
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} if( lba >= 0) break;
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//lead-out point
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for(uint repeat : range(3)) {
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auto q = toQ(lba);
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q[0] = 0x01;
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q[1] = 0x00;
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q[2] = 0xa2; //lead-out point
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auto msf = MSF(lba);
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q[3] = BCD::encode(msf.minute);
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q[4] = BCD::encode(msf.second);
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q[5] = BCD::encode(msf.frame);
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q[6] = 0x00;
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msf = MSF(leadOut.lba);
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q[7] = BCD::encode(msf.minute);
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q[8] = BCD::encode(msf.second);
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q[9] = BCD::encode(msf.frame);
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auto crc16 = CRC16({q, 10});
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q[10] = crc16 >> 8;
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q[11] = crc16 >> 0;
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if(++lba >= 0) break;
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} if( lba >= 0) break;
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}
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//tracks
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int end = leadOut.lba;
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for(uint8_t trackID : reverse(range(100))) {
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auto& track = tracks[trackID];
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if(!track) continue;
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//indices
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for(uint8_t indexID : reverse(range(100))) {
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auto& index = track.indices[indexID];
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if(!index) continue;
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for(int lba = index.lba; lba < end; lba++) {
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auto p = toP(lba);
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uint8_t byte = indexID == 0 ? 0xff : 0x00;
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for(uint index : range(12)) p[index] = byte;
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auto q = toQ(lba);
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q[0] = track.control << 4 | track.address << 0;
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q[1] = BCD::encode(trackID);
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q[2] = BCD::encode(indexID);
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auto msf = MSF(lba - track.indices[1].lba);
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q[3] = BCD::encode(msf.minute);
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q[4] = BCD::encode(msf.second);
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q[5] = BCD::encode(msf.frame);
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q[6] = 0x00;
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msf = MSF(lba);
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q[7] = BCD::encode(msf.minute);
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q[8] = BCD::encode(msf.second);
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q[9] = BCD::encode(msf.frame);
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auto crc16 = CRC16({q, 10});
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q[10] = crc16 >> 8;
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q[11] = crc16 >> 0;
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}
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end = index.lba;
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}
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}
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//lead-out
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for(int lba : range(sectors - abs(leadIn.lba) - leadOut.lba)) {
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auto p = toP(leadOut.lba + lba);
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uint8_t byte;
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if(lba < 150) {
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//2s start (standard specifies 2-3s start)
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byte = 0x00;
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} else {
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//2hz duty cycle; rounded downward (standard specifies 2% tolerance)
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byte = (lba - 150) / (75 >> 1) & 1 ? 0xff : 0x00;
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}
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for(uint index : range(12)) p[index] = byte;
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auto q = toQ(leadOut.lba + lba);
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q[0] = 0x01;
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q[1] = 0xaa; //lead-out track#
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q[2] = 0x01; //lead-out index#
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auto msf = MSF(lba);
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q[3] = BCD::encode(msf.minute);
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q[4] = BCD::encode(msf.second);
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q[5] = BCD::encode(msf.frame);
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q[6] = 0x00;
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msf = MSF(leadOut.lba + lba);
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q[7] = BCD::encode(msf.minute);
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q[8] = BCD::encode(msf.second);
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q[9] = BCD::encode(msf.frame);
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auto crc16 = CRC16({q, 10});
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q[10] = crc16 >> 8;
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q[11] = crc16 >> 0;
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}
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data.resize(data.size() - 96); //remove padding for P shift
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return data;
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}
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auto decode(array_view<uint8_t> data, uint size, uint leadOutSectors = 0) -> bool {
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*this = {}; //reset session
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//three data[] types supported: subcode Q only, subcode P-W only, data+subcode complete image
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if(size != 12 && size != 96 && size != 2448) return false;
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//determine lead-in sector count
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for(int lba : range(7500)) { //7500 max sectors scanned
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uint offset = lba * size;
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if(size == 96) offset += 12;
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if(size == 2448) offset += 12 + 2352;
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if(offset + 12 > data.size()) break;
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auto q = array_view<uint8_t>{&data[offset], 12};
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auto crc16 = CRC16({q, 10});
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if(q[10] != uint8_t(crc16 >> 8)) continue;
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if(q[11] != uint8_t(crc16 >> 0)) continue;
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uint8_t control = q[0] >> 4;
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uint8_t address = q[0] & 15;
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uint8_t trackID = q[1];
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if(address != 1) continue;
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if(trackID != 0) continue;
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auto msf = MSF::fromBCD(q[3], q[4], q[5]);
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leadIn.lba = msf.toLBA() - lba;
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break;
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}
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if(leadIn.lba == InvalidLBA || leadIn.lba >= 0) return false;
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auto toQ = [&](int lba) -> array_view<uint8_t> {
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uint offset = (lba + abs(leadIn.lba)) * size;
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if(size == 96) offset += 12;
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if(size == 2448) offset += 12 + 2352;
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if(offset + 12 > data.size()) return {};
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return {&data[offset], 12};
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};
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//lead-in
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for(int lba = leadIn.lba; lba < 0; lba++) {
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auto q = toQ(lba);
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if(!q) break;
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auto crc16 = CRC16({q, 10});
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if(q[10] != uint8_t(crc16 >> 8)) continue;
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if(q[11] != uint8_t(crc16 >> 0)) continue;
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uint8_t control = q[0] >> 4;
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uint8_t address = q[0] & 15;
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uint8_t trackID = q[1];
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if(address != 1) continue;
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if(trackID != 0) continue;
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trackID = BCD::decode(q[2]);
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if(trackID <= 99) { //00-99
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auto& track = tracks[trackID];
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track.control = control;
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track.address = address;
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track.indices[1].lba = MSF::fromBCD(q[7], q[8], q[9]).toLBA();
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}
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if(trackID == 100) { //a0
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firstTrack = BCD::decode(q[7]);
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}
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if(trackID == 101) { //a1
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lastTrack = BCD::decode(q[7]);
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}
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if(trackID == 102) { //a2
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leadOut.lba = MSF::fromBCD(q[7], q[8], q[9]).toLBA();
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}
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}
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if(leadOut.lba == InvalidLBA) return false;
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//tracks
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for(int lba = 0; lba < leadOut.lba; lba++) {
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auto q = toQ(lba);
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if(!q) break;
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auto crc16 = CRC16({q, 10});
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if(q[10] != uint8_t(crc16 >> 8)) continue;
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if(q[11] != uint8_t(crc16 >> 0)) continue;
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uint8_t control = q[0] >> 4;
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uint8_t address = q[0] & 15;
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uint8_t trackID = BCD::decode(q[1]);
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uint8_t indexID = BCD::decode(q[2]);
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if(address != 1) continue;
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if(trackID > 99) continue;
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if(indexID > 99) continue;
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auto& track = tracks[trackID];
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if(!track) continue; //track not found?
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auto& index = track.indices[indexID];
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if(index) continue; //index already decoded?
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index.lba = MSF::fromBCD(q[7], q[8], q[9]).toLBA();
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}
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synchronize(leadOutSectors);
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return true;
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}
|
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|
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//calculates Index::end variables:
|
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//needed for Session::isTrack() and Track::isIndex() to function.
|
||||
auto synchronize(uint leadOutSectors = 0) -> void {
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||||
leadIn.end = -1;
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int end = leadOut.lba - 1;
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for(uint trackID : reverse(range(100))) {
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auto& track = tracks[trackID];
|
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if(!track) continue;
|
||||
|
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for(uint indexID : reverse(range(100))) {
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auto& index = track.indices[indexID];
|
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if(!index) continue;
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index.end = end;
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end = index.lba - 1;
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}
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|
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for(uint indexID : range(100)) {
|
||||
auto& index = track.indices[indexID];
|
||||
if(index) { track.firstIndex = indexID; break; }
|
||||
}
|
||||
|
||||
for(uint indexID : reverse(range(100))) {
|
||||
auto& index = track.indices[indexID];
|
||||
if(index) { track.lastIndex = indexID; break; }
|
||||
}
|
||||
}
|
||||
leadOut.end = leadOut.lba + leadOutSectors - 1;
|
||||
}
|
||||
|
||||
//for diagnostic use only
|
||||
auto serialize() const -> string {
|
||||
string s;
|
||||
s.append("session\n");
|
||||
s.append(" leadIn: ");
|
||||
s.append(MSF(leadIn.lba).toString(), " - ", MSF(leadIn.end).toString(), "\n");
|
||||
for(uint trackID : range(100)) {
|
||||
auto& track = tracks[trackID];
|
||||
if(!track) continue;
|
||||
s.append(" track", pad(trackID, 2, '0'));
|
||||
if(trackID == firstTrack) s.append(" first");
|
||||
if(trackID == lastTrack) s.append( " last");
|
||||
s.append("\n");
|
||||
s.append(" control: ", binary(track.control, 4, '0'), "\n");
|
||||
s.append(" address: ", binary(track.address, 4, '0'), "\n");
|
||||
for(uint indexID : range(100)) {
|
||||
auto& index = track.indices[indexID];
|
||||
if(!index) continue;
|
||||
s.append(" index", pad(indexID, 2, '0'), ": ");
|
||||
s.append(MSF(index.lba).toString(), " - ", MSF(index.end).toString(), "\n");
|
||||
}
|
||||
}
|
||||
s.append(" leadout: ");
|
||||
s.append(MSF(leadOut.lba).toString(), " - ", MSF(leadOut.end).toString(), "\n");
|
||||
return s;
|
||||
}
|
||||
};
|
||||
|
||||
}
|
||||
Reference in New Issue
Block a user