CdTextEncoder.cc
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上传日期:2007-01-06
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文件大小:14k
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SCSI/ASPI
开发平台:
MultiPlatform
- /* cdrdao - write audio CD-Rs in disc-at-once mode
- *
- * Copyright (C) 1998, 1999 Andreas Mueller <mueller@daneb.ping.de>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- */
- /*
- * $Log: CdTextEncoder.cc,v $
- * Revision 1.1 1999/06/13 19:31:15 mueller
- * Initial revision
- *
- */
- #include "CdTextEncoder.h"
- #include <stddef.h>
- #include <string.h>
- #include <assert.h>
- #include "util.h"
- #include "Toc.h"
- #include "CdTextItem.h"
- #include "PWSubChannel96.h"
- static char rcsid[] = "$Id: CdTextEncoder.cc,v 1.1 1999/06/13 19:31:15 mueller Exp mueller $";
- unsigned short CdTextEncoder::CRCTAB_[256] = {
- 0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50A5, 0x60C6, 0x70E7, 0x8108,
- 0x9129, 0xA14A, 0xB16B, 0xC18C, 0xD1AD, 0xE1CE, 0xF1EF, 0x1231, 0x0210,
- 0x3273, 0x2252, 0x52B5, 0x4294, 0x72F7, 0x62D6, 0x9339, 0x8318, 0xB37B,
- 0xA35A, 0xD3BD, 0xC39C, 0xF3FF, 0xE3DE, 0x2462, 0x3443, 0x0420, 0x1401,
- 0x64E6, 0x74C7, 0x44A4, 0x5485, 0xA56A, 0xB54B, 0x8528, 0x9509, 0xE5EE,
- 0xF5CF, 0xC5AC, 0xD58D, 0x3653, 0x2672, 0x1611, 0x0630, 0x76D7, 0x66F6,
- 0x5695, 0x46B4, 0xB75B, 0xA77A, 0x9719, 0x8738, 0xF7DF, 0xE7FE, 0xD79D,
- 0xC7BC, 0x48C4, 0x58E5, 0x6886, 0x78A7, 0x0840, 0x1861, 0x2802, 0x3823,
- 0xC9CC, 0xD9ED, 0xE98E, 0xF9AF, 0x8948, 0x9969, 0xA90A, 0xB92B, 0x5AF5,
- 0x4AD4, 0x7AB7, 0x6A96, 0x1A71, 0x0A50, 0x3A33, 0x2A12, 0xDBFD, 0xCBDC,
- 0xFBBF, 0xEB9E, 0x9B79, 0x8B58, 0xBB3B, 0xAB1A, 0x6CA6, 0x7C87, 0x4CE4,
- 0x5CC5, 0x2C22, 0x3C03, 0x0C60, 0x1C41, 0xEDAE, 0xFD8F, 0xCDEC, 0xDDCD,
- 0xAD2A, 0xBD0B, 0x8D68, 0x9D49, 0x7E97, 0x6EB6, 0x5ED5, 0x4EF4, 0x3E13,
- 0x2E32, 0x1E51, 0x0E70, 0xFF9F, 0xEFBE, 0xDFDD, 0xCFFC, 0xBF1B, 0xAF3A,
- 0x9F59, 0x8F78, 0x9188, 0x81A9, 0xB1CA, 0xA1EB, 0xD10C, 0xC12D, 0xF14E,
- 0xE16F, 0x1080, 0x00A1, 0x30C2, 0x20E3, 0x5004, 0x4025, 0x7046, 0x6067,
- 0x83B9, 0x9398, 0xA3FB, 0xB3DA, 0xC33D, 0xD31C, 0xE37F, 0xF35E, 0x02B1,
- 0x1290, 0x22F3, 0x32D2, 0x4235, 0x5214, 0x6277, 0x7256, 0xB5EA, 0xA5CB,
- 0x95A8, 0x8589, 0xF56E, 0xE54F, 0xD52C, 0xC50D, 0x34E2, 0x24C3, 0x14A0,
- 0x0481, 0x7466, 0x6447, 0x5424, 0x4405, 0xA7DB, 0xB7FA, 0x8799, 0x97B8,
- 0xE75F, 0xF77E, 0xC71D, 0xD73C, 0x26D3, 0x36F2, 0x0691, 0x16B0, 0x6657,
- 0x7676, 0x4615, 0x5634, 0xD94C, 0xC96D, 0xF90E, 0xE92F, 0x99C8, 0x89E9,
- 0xB98A, 0xA9AB, 0x5844, 0x4865, 0x7806, 0x6827, 0x18C0, 0x08E1, 0x3882,
- 0x28A3, 0xCB7D, 0xDB5C, 0xEB3F, 0xFB1E, 0x8BF9, 0x9BD8, 0xABBB, 0xBB9A,
- 0x4A75, 0x5A54, 0x6A37, 0x7A16, 0x0AF1, 0x1AD0, 0x2AB3, 0x3A92, 0xFD2E,
- 0xED0F, 0xDD6C, 0xCD4D, 0xBDAA, 0xAD8B, 0x9DE8, 0x8DC9, 0x7C26, 0x6C07,
- 0x5C64, 0x4C45, 0x3CA2, 0x2C83, 0x1CE0, 0x0CC1, 0xEF1F, 0xFF3E, 0xCF5D,
- 0xDF7C, 0xAF9B, 0xBFBA, 0x8FD9, 0x9FF8, 0x6E17, 0x7E36, 0x4E55, 0x5E74,
- 0x2E93, 0x3EB2, 0x0ED1, 0x1EF0
- };
- class CdTextPackEntry {
- public:
- CdTextPackEntry(unsigned char packType, unsigned char trackNr,
- unsigned char packId);
- int blockNr();
- void blockNr(int);
- void characterPos(int);
- union {
- CdTextPack pack;
- unsigned char packData[18];
- };
- CdTextPackEntry *next_;
- };
- CdTextPackEntry::CdTextPackEntry(unsigned char packType, unsigned char trackNr,
- unsigned char packId)
- {
- memset(&pack, 0, sizeof(pack));
- next_ = NULL;
- pack.packType = packType;
- pack.trackNumber = trackNr;
- pack.sequenceNumber = packId;
- }
- int CdTextPackEntry::blockNr()
- {
- return (pack.blockCharacter >> 4) & 0x07;
- }
- void CdTextPackEntry::blockNr(int blockNr)
- {
- pack.blockCharacter &= 0x8f;
- pack.blockCharacter |= (blockNr << 4) & 0x70;
- }
- void CdTextPackEntry::characterPos(int pos)
- {
- pack.blockCharacter &= 0xf0;
- if (pos > 15) {
- pack.blockCharacter |= 0x0f;
- }
- else {
- pack.blockCharacter |= pos;
- }
- }
- CdTextEncoder::CdTextEncoder(const Toc *toc)
- {
- int i;
- toc_ = toc;
- packCount_ = 0;
- packs_ = lastPack_ = NULL;
- lastPackPos_ = 0;
- subChannels_ = NULL;
- subChannelCount_ = 0;
- for (i = 0; i < 8; i++)
- memset(&(sizeInfo_[i]), 0, sizeof(CdTextSizeInfo));
- }
- CdTextEncoder::~CdTextEncoder()
- {
- long i;
- CdTextPackEntry *pnext;
- toc_ = NULL;
- while (packs_ != NULL) {
- pnext = packs_->next_;
- delete packs_;
- packs_ = pnext;
- }
- lastPack_ = NULL;
- if (subChannels_ != NULL) {
- for (i = 0; i < subChannelCount_; i++) {
- delete subChannels_[i];
- subChannels_[i] = NULL;
- }
- delete[] subChannels_;
- subChannels_ = NULL;
- }
- }
- int CdTextEncoder::encode()
- {
- buildPacks();
- calcCrcs();
- if (packs_ != NULL) {
- message(3, "nCD-TEXT packs:");
- CdTextPackEntry *prun;
- for (prun = packs_; prun != NULL; prun = prun->next_) {
- message(3, "%02x %02x %02x %02x: %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x CRC: %02x %02x", prun->pack.packType,
- prun->pack.trackNumber, prun->pack.sequenceNumber,
- prun->pack.blockCharacter, prun->pack.data[0],
- prun->pack.data[1], prun->pack.data[2], prun->pack.data[3],
- prun->pack.data[4], prun->pack.data[5], prun->pack.data[6],
- prun->pack.data[7], prun->pack.data[8], prun->pack.data[9],
- prun->pack.data[10], prun->pack.data[11],
- prun->pack.crc0, prun->pack.crc1);
- }
- }
- buildSubChannels();
- return 0;
- }
- const PWSubChannel96 **CdTextEncoder::getSubChannels(long *subChannelCount)
- {
- *subChannelCount = subChannelCount_;
- return (const PWSubChannel96 **)subChannels_;
- }
- void CdTextEncoder::buildPacks()
- {
- int blockNr;
- for (blockNr = 0; blockNr <= 7; blockNr++) {
- if (toc_->cdTextLanguage(blockNr) >= 0) {
- // only build the packs if the language code is defined
- packId_ = 0;
- buildPacks(blockNr, CdTextItem::CDTEXT_TITLE);
- buildPacks(blockNr, CdTextItem::CDTEXT_PERFORMER);
- buildPacks(blockNr, CdTextItem::CDTEXT_SONGWRITER);
- buildPacks(blockNr, CdTextItem::CDTEXT_COMPOSER);
- buildPacks(blockNr, CdTextItem::CDTEXT_ARRANGER);
- buildPacks(blockNr, CdTextItem::CDTEXT_MESSAGE);
- buildPacks(blockNr, CdTextItem::CDTEXT_DISK_ID);
- buildPacks(blockNr, CdTextItem::CDTEXT_GENRE);
- buildPacks(blockNr, CdTextItem::CDTEXT_TOC_INFO1);
- buildPacks(blockNr, CdTextItem::CDTEXT_TOC_INFO2);
- buildPacks(blockNr, CdTextItem::CDTEXT_UPCEAN_ISRC);
- }
- }
- buildSizeInfoPacks();
- }
- // Build packs for specified language (blockNr) and pack type. First the
- // global pack is created and then the track specific packs.
- void CdTextEncoder::buildPacks(int blockNr, CdTextItem::PackType type)
- {
- const CdTextItem *globalItem;
- const CdTextItem *item;
- int i;
- int n = toc_->nofTracks();
- int tracks;
- if ((globalItem = toc_->getCdTextItem(0, blockNr, type)) != NULL) {
- encodeCdTextItem(0, blockNr, globalItem);
- }
- if (CdTextItem::isTrackPack(type)) {
- // count tracks that have the current pack type defined
- tracks = 0;
- for (i = 1; i <= n; i++) {
- if (toc_->getCdTextItem(i, blockNr, type) != NULL)
- tracks++;
- }
- if (tracks > 0) {
- if (globalItem == NULL && type == CdTextItem::CDTEXT_UPCEAN_ISRC) {
- // Special handling for UPC/EAN field. If this field is not defined
- // but ISRC codes are defined for the tracks an pack with an empty
- // string is created.
- CdTextItem upcEan(CdTextItem::CDTEXT_UPCEAN_ISRC, blockNr, "");
- encodeCdTextItem(0, blockNr, &upcEan);
- }
- for (i = 1; i <= n; i++) {
- if ((item = toc_->getCdTextItem(i, blockNr, type)) == NULL)
- item = globalItem;
- if (item != NULL)
- encodeCdTextItem(i, blockNr, item);
- }
- }
- }
- }
- // Build CD-TEXT packs for a CdTextItem. Space from the last pack is
- // used if the pack type and language are matching.
- void CdTextEncoder::encodeCdTextItem(int trackNr, int blockNr,
- const CdTextItem *item)
- {
- long dataLen = item->dataLen();
- const unsigned char *data = item->data();
- long pos, n;
- CdTextPackEntry *pack = NULL;
- int first = 1;
- if (CdTextItem::isBinaryPack(item->packType())) {
- pos = 0;
- while (dataLen > 0) {
- switch (item->packType()) {
- case CdTextItem::CDTEXT_GENRE:
- pack = new CdTextPackEntry(item->packType(), 0, packId_++);
- if (pos > 0)
- pack->characterPos((pos * 12) - 2);
- break;
- case CdTextItem::CDTEXT_TOC_INFO1:
- if (pos == 0)
- pack = new CdTextPackEntry(item->packType(), 0, packId_++);
- else
- pack = new CdTextPackEntry(item->packType(), ((pos - 1) * 4) + 1,
- packId_++);
- break;
- default:
- pack = new CdTextPackEntry(item->packType(), pos, packId_++);
- break;
- }
- n = (dataLen > 12) ? 12 : dataLen;
- memcpy(pack->pack.data, data, n);
- pack->blockNr(blockNr);
- appendPack(pack);
- lastPackPos_ = 12;
- data += n;
- dataLen -= n;
- pos++;
- }
- }
- else {
- pos = 0;
- while (dataLen > 0) {
- if (first && lastPack_ != NULL &&
- lastPack_->pack.packType == item->packType() &&
- lastPack_->blockNr() == blockNr &&
- lastPackPos_ < 12) {
- // we can use space from previous block
- pack = lastPack_;
- }
- else {
- pack = new CdTextPackEntry(item->packType(), trackNr, packId_++);
- pack->blockNr(blockNr);
- pack->characterPos(pos);
- appendPack(pack);
- lastPackPos_ = 0;
- }
- n = (dataLen > 12 - lastPackPos_) ? 12 - lastPackPos_ : dataLen;
- memcpy(pack->pack.data + lastPackPos_, data, n);
- data += n;
- lastPackPos_ += n;
- pos += n;
- dataLen -= n;
- first = 0;
- }
- }
- }
- // Create the SIZE_INFO CD-TEXT packs which contains a summary about all
- // CD-TEXT packs.
- void CdTextEncoder::buildSizeInfoPacks()
- {
- CdTextItem *sizeInfoItem;
- int i;
- int b;
- if (lastPack_ == NULL) {
- // no packs at all -> nothing to do
- return;
- }
- for (b = 0; b < 8; b++) {
- sizeInfo_[b].characterCode = 1; // ASCII (7bit)
- sizeInfo_[b].firstTrack = 1; // we always start with track 1
- sizeInfo_[b].lastTrack = toc_->nofTracks();
- sizeInfo_[b].copyright = 3; // to look like all other CD-TEXT CDs
- for (i = 0; i < 8; i++) {
- if (sizeInfo_[b].lastSequenceNumber[i] > 0) {
- // set language code if we have at least one pack for this language
- sizeInfo_[b].languageCode[i] = toc_->cdTextLanguage(i);
- // adjust the last sequence number for the packs we will create
- sizeInfo_[b].lastSequenceNumber[i] += 3;
- }
- }
- // adjust the counter for the packs we're currently creating
- sizeInfo_[b].packTypeCount[15] += 3; // we create 3 packs
- }
- for (b = 0; b < 8; b++) {
- if (sizeInfo_[b].lastSequenceNumber[b] > 0) {
- // ' - 3' because we've already adjusted the pack count
- packId_ = sizeInfo_[b].lastSequenceNumber[b] - 3 + 1;
- sizeInfoItem = new CdTextItem(CdTextItem::CDTEXT_SIZE_INFO, b,
- (unsigned char*)&(sizeInfo_[b]),
- sizeof(CdTextSizeInfo));
- encodeCdTextItem(0, b, sizeInfoItem);
- delete sizeInfoItem;
- }
- }
- }
- // Calculates checksum for each CD-TEXT pack.
- void CdTextEncoder::calcCrcs()
- {
- CdTextPackEntry *prun;
- register unsigned char data;
- register unsigned short crc;
- register int i;
- for (prun = packs_; prun != NULL; prun = prun->next_) {
- crc = 0;
- for (i = 0; i < 16; i++) {
- data = prun->packData[i];
- crc = CRCTAB_[(crc >> 8) ^ data] ^ (crc << 8);
- }
- crc = ~crc;
- prun->pack.crc0 = crc >> 8;
- prun->pack.crc1 = crc;
- }
- }
- // Builds the R-W sub-channel data for all CD-TEXT packs. The sub-channel
- // data of each sector can hold 4 CD-TEXT packs.
- void CdTextEncoder::buildSubChannels()
- {
- long i;
- CdTextPackEntry *prun;
- unsigned char buf[72];
- subChannelCount_ = packCount_ / 4;
- if (packCount_ % 4 != 0)
- subChannelCount_ += 1;
- if (subChannelCount_ == 0) {
- subChannels_ = NULL;
- return;
- }
- subChannels_ = new (PWSubChannel96*)[subChannelCount_];
- prun = packs_;
- for (i = 0; i < subChannelCount_; i++) {
- subChannels_[i] = new PWSubChannel96;
- memset(buf, 0, 72);
- memcpy(buf, prun->packData, 18);
- if ((prun = prun->next_) != NULL) {
- memcpy(buf + 18, prun->packData, 18);
- if ((prun = prun->next_) != NULL) {
- memcpy(buf + 36, prun->packData, 18);
- if ((prun = prun->next_) != NULL) {
- memcpy(buf + 54, prun->packData, 18);
- prun = prun->next_;
- }
- }
- }
- subChannels_[i]->setRawRWdata(buf);
- #if 0
- int j, k;
- for (j = 0; j < 6; j++) {
- message(0, "%ld:%d: ", i, j);
- for (k = 0; k < 16; k++) {
- message(0, "%02x ", subChannels_[i]->data()[j * 16 + k]);
- }
- message(0, "");
- }
- unsigned char buf1[72];
- subChannels_[i]->getRawRWdata(buf1);
- message(0, "Match: %d", memcmp(buf, buf1, 72));
- #endif
- }
- }
- void CdTextEncoder::appendPack(CdTextPackEntry *pack)
- {
- int b;
- assert(pack->blockNr() >= 0 && pack->blockNr() <= 7);
- pack->next_ = NULL;
- if (packs_ == NULL) {
- packs_ = lastPack_ = pack;
- }
- else {
- if (pack->blockNr() >= lastPack_->blockNr()) {
- lastPack_->next_ = pack;
- lastPack_ = pack;
- }
- else {
- CdTextPackEntry *prun, *ppred;
- for (ppred = NULL, prun = packs_; prun != NULL;
- ppred = prun, prun = prun->next_) {
- if (pack->blockNr() < prun->blockNr())
- break;
- }
- if (prun == NULL) {
- // this case should have been handled above
- lastPack_->next_ = pack;
- lastPack_ = pack;
- }
- else {
- if (ppred == NULL) {
- pack->next_ = packs_;
- packs_ = pack;
- }
- else {
- ppred->next_ = pack;
- pack->next_ = prun;
- }
- }
- }
- }
- packCount_++;
- // update summary data used for creating the SIZE_INFO pack
- sizeInfo_[pack->blockNr()].packTypeCount[pack->pack.packType - 0x80] += 1;
- for (b = 0; b < 8; b++) {
- if (pack->pack.sequenceNumber >
- sizeInfo_[b].lastSequenceNumber[pack->blockNr()]) {
- sizeInfo_[b].lastSequenceNumber[pack->blockNr()] =
- pack->pack.sequenceNumber;
- }
- }
- }