AccurateRip ID

[sredmyer]

I think I read somewhere where Spoon said that it is possible to calculate the AccurateRip ID from the raw TOC. If this is true, has Spoon ever shared the algorithm for calculating it.

If not, Spoon, would you be willing to share it?

Thanks,
Steve

[Spoon]

Re: AccurateRip ID

Here is the raw code:

//-------------------------------------------------------------------------------
void AccurateRipFillInDiscIdent (STAcRipDiscIdent *pRDI, ARTOC *pTOCSend)
{
	ZeroMemory(pRDI, sizeof(STAcRipDiscIdent));

	//----we dont want to touch orig TOC----
	ARTOC TOC = *pTOCSend;
	ARTOC *pTOC = &TOC;

	//------create track lengths-----
	SList lstRetTrackLBA;
				
	DWORD dwStart, dwLen;
	bool WereSomeTracks = false;
        int i;
	for( i = pTOC->FirstTrack; i <= pTOC->LastTrack; i++ )
	{
		WereSomeTracks = true;
		//---only add if is audio!-----
		if ( (pTOC->Tracks[i - 1].Adr & 4) == 0)	// not a data track?
		{
			MSB2DWORD( &dwStart, pTOC->Tracks[i - 1].Address );
	 		MSB2DWORD( &dwLen, pTOC->Tracks[i].Address );
			dwLen-= dwStart;
			lstRetTrackLBA.Add((void *)dwStart);
		}
	}
	//-------last track also------
	if (WereSomeTracks)	// if want addresses then give address of last END
	{
		MSB2DWORD( &dwStart, pTOC->Tracks[i - 1].Address );
		lstRetTrackLBA.Add((void *)dwStart);
	}

	pRDI->TrackCount = (unsigned char)lstRetTrackLBA.Count;
	if (pRDI->TrackCount)
		pRDI->TrackCount--;		// as are addresses the last one is the end address

	for (i = 0; i < lstRetTrackLBA.Count; i++)
	{
		DWORD LBA = (DWORD)lstRetTrackLBA.Items[i];
		pRDI->TrackOffsetsAdded+=LBA;
		if (LBA == 0)
			LBA++;
		pRDI->TrackOffsetsMultiplied+=(LBA * (i+1));
	}

	//-----calc freedb-----
	int NumTracks = pTOC->LastTrack - pTOC->FirstTrack + 1;
	DWORD n = 0, j = 2;
	DWORD pID[200];

	for (int fr = pTOC->FirstTrack - 1; fr <= pTOC->LastTrack; fr++)
		LBA2MSF(pTOC->Tracks[fr].Address);	// conv to MSF

	for( i = pTOC->FirstTrack - 1; i < pTOC->LastTrack; i++, j++ )
	{
		pID[j] = ((( pTOC->Tracks[i].Address[1] * 60) + pTOC->Tracks[i].Address[2]) * 75) + pTOC->Tracks[i].Address[3];
		n+= CDDBSum( 60 * pTOC->Tracks[i].Address[1] + pTOC->Tracks[i].Address[2] );
	}
	int t = ((60 * pTOC->Tracks[NumTracks].Address[1]) + pTOC->Tracks[NumTracks].Address[2]) - ((60 * pTOC->Tracks[0].Address[1]) + pTOC->Tracks[0].Address[2]);
	pID[0] = ((n%0xFF) << 24) | (t << 8) | NumTracks;
	pRDI->FreedBIdent = pID[0];
}