168 lines
3.9 KiB
C++
168 lines
3.9 KiB
C++
#include "main.h"
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#include "cddb.h"
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#include <strsafe.h>
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/*
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* cddb_sum
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* Convert an integer to its text string representation, and
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* compute its checksum. Used by cddb_discid to derive the
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* disc ID.
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*
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* Args:
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* n - The integer value.
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*
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* Return:
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* The integer checksum.
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*/
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int cddb_sum(int n)
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{
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char buf[12],
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*p;
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int ret = 0;
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/* For backward compatibility this algorithm must not change */
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StringCchPrintfA(buf, 12, "%lu", n);
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for (p = buf; *p != '\0'; p++)
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ret += (*p - '0');
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return (ret);
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}
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/*
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* cddb_discid
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* Compute a magic disc ID based on the number of tracks,
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* the length of each track, and a checksum of the string
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* that represents the offset of each track.
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*
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* Return:
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* The integer disc ID.
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*/
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unsigned long cddb_discid(unsigned char nTracks, unsigned int* pnMin, unsigned int* pnSec)
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{
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int i,
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t = 0,
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n = 0;
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/* For backward compatibility this algorithm must not change */
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for (i = 0; i < (int) nTracks; i++)
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{
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n += cddb_sum((pnMin[i] * 60) + pnSec[i]);
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t += ((pnMin[i + 1] * 60) + pnSec[i + 1]) - ((pnMin[i] * 60) + pnSec[i]);
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}
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return ((n % 0xff) << 24 | t << 8 | nTracks);
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}
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// Functions used to generate the CDDB id
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void CDGetEndFrame(MCIDEVICEID wDeviceID,
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DINFO* psDI,
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unsigned int nOffset,
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unsigned int* pnFrame,
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unsigned int* pnMin,
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unsigned int* pnSec)
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{
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MCI_STATUS_PARMS sMCIStatus;
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sMCIStatus.dwItem = MCI_STATUS_LENGTH;
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MCISendCommand(wDeviceID, MCI_STATUS, MCI_STATUS_ITEM | MCI_WAIT,
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(DWORD_PTR)(LPVOID) &sMCIStatus);
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#ifdef _WIN64
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*pnFrame = (unsigned int)((double)sMCIStatus.dwReturn * (75.0 / 1000.0));
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#else
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{
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int nFrame;
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static double tmp = 75.0 / 1000.0;
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unsigned long a = sMCIStatus.dwReturn;
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__asm
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{
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fld qword ptr tmp
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fild dword ptr a
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fmul
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fistp dword ptr nFrame
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}
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*pnFrame = nFrame;
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}
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#endif
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pnFrame[0] += 1 + nOffset; // Due to bug in MCI according to CDDB docs!
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psDI->nDiscLength = (pnFrame[0] / 75);
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*pnMin = pnFrame[0] / 75 / 60;
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*pnSec = (pnFrame[0] / 75) % 60;
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}
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void CDGetAbsoluteTrackPos(MCIDEVICEID wDeviceID,
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unsigned int nTrack,
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unsigned int* pnFrame,
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unsigned int* pnMin,
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unsigned int* pnSec)
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{
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MCI_STATUS_PARMS sMCIStatus;
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sMCIStatus.dwItem = MCI_STATUS_POSITION;
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sMCIStatus.dwTrack = nTrack;
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MCISendCommand(wDeviceID, MCI_STATUS, MCI_STATUS_ITEM | MCI_TRACK | MCI_WAIT,
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(DWORD_PTR)(LPVOID) &sMCIStatus);
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#ifdef _WIN64
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*pnFrame = (int)((double)sMCIStatus.dwReturn * (75.0 / 1000.0));
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#else
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{
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static double tmp = 75.0 / 1000.0;
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unsigned long a = sMCIStatus.dwReturn;
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__asm
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{
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fld qword ptr tmp
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fild dword ptr a
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fmul
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fistp dword ptr a
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}
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*pnFrame = a;
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}
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#endif
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*pnMin = *pnFrame / 75 / 60;
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*pnSec = (*pnFrame / 75) % 60;
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}
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int GetDiscID(MCIDEVICEID wDeviceID, DINFO* psDI)
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{
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MCI_SET_PARMS sMCISet;
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unsigned int nLoop;
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unsigned int nMCITracks = CDGetTracks(wDeviceID);
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unsigned int* pnMin = NULL;
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unsigned int* pnSec = NULL;
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if (nMCITracks > 65535) return 1;
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if (nMCITracks > 128) nMCITracks = 128;
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psDI->ntracks = nMCITracks;
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pnMin = (unsigned int*)GlobalAlloc(GPTR, (nMCITracks + 1) * 2 * sizeof(unsigned int));
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if (!pnMin) return 1;
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pnSec = pnMin + (nMCITracks + 1);
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sMCISet.dwTimeFormat = MCI_FORMAT_MILLISECONDS;
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MCISendCommand(wDeviceID, MCI_SET, MCI_SET_TIME_FORMAT, (DWORD_PTR)(LPVOID) &sMCISet);
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for (nLoop = 0 ; nLoop < nMCITracks; nLoop ++)
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CDGetAbsoluteTrackPos(wDeviceID, nLoop + 1, &psDI->pnFrames[nLoop], &pnMin[nLoop], &pnSec[nLoop]);
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CDGetEndFrame(wDeviceID, psDI, psDI->pnFrames[0], &psDI->pnFrames[nLoop], &pnMin[nLoop], &pnSec[nLoop]);
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psDI->CDDBID = cddb_discid((unsigned char)nMCITracks, pnMin, pnSec);
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sMCISet.dwTimeFormat = MCI_FORMAT_TMSF;
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MCISendCommand(wDeviceID, MCI_SET, MCI_SET_TIME_FORMAT, (DWORD_PTR)(LPVOID) &sMCISet);
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if (pnMin)
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{
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GlobalFree(pnMin);
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}
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return 0;
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} |