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#include "stdafx.h"
long JumpID3v2 ( MPC_reader* fp );//idtag.cpp
static const char*
Stringify ( unsigned int profile ) // profile is 0...15, where 7...13 is used
{
static const char na [] = "n.a.";
static const char* Names [] = {
na, "'Unstable/Experimental'", na, na,
na, "'quality 0'", "'quality 1'", "'Telephone'",
"'Thumb'", "'Radio'", "'Standard'", "'Xtreme'",
"'Insane'", "'BrainDead'", "'quality 9'", "'quality 10'"
};
return profile >= sizeof(Names)/sizeof(*Names) ? na : Names [profile];
}
// read information from SV8 header
int StreamInfo::ReadHeaderSV8 ( MPC_reader* fp )
{
return 0;
}
// read information from SV7 header
int StreamInfo::ReadHeaderSV7 ( unsigned int HeaderData [8] )
{
const int samplefreqs [4] = { 44100, 48000, 37800, 32000 };
//unsigned int HeaderData [8];
unsigned short EstimatedPeakTitle = 0;
if ( simple.StreamVersion > 0x71 ) {
// Update (simple.StreamVersion);
return 0;
}
/*
if ( !fp->seek ( simple.HeaderPosition, SEEK_SET ) ) // seek to header start
return ERROR_CODE_FILE;
if ( fp->read ( HeaderData, sizeof HeaderData) != sizeof HeaderData )
return ERROR_CODE_FILE;
*/
simple.Bitrate = 0;
simple.Frames = HeaderData[1];
simple.IS = 0;
simple.MS = (HeaderData[2] >> 30) & 0x0001;
simple.MaxBand = (HeaderData[2] >> 24) & 0x003F;
simple.BlockSize = 1;
simple.Profile = (HeaderData[2] << 8) >> 28;
simple.ProfileName = Stringify ( simple.Profile );
simple.SampleFreq = samplefreqs [(HeaderData[2]>>16) & 0x0003];
EstimatedPeakTitle = (unsigned short)( HeaderData[2] & 0xFFFF ); // read the ReplayGain data
simple.GainTitle = (unsigned short)((HeaderData[3] >> 16) & 0xFFFF );
simple.PeakTitle = (unsigned short)( HeaderData[3] & 0xFFFF );
simple.GainAlbum = (unsigned short)((HeaderData[4] >> 16) & 0xFFFF );
simple.PeakAlbum = (unsigned short)( HeaderData[4] & 0xFFFF );
simple.IsTrueGapless = (HeaderData[5] >> 31) & 0x0001; // true gapless: used?
simple.LastFrameSamples = (HeaderData[5] >> 20) & 0x07FF; // true gapless: valid samples for last frame
simple.EncoderVersion = (HeaderData[6] >> 24) & 0x00FF;
if ( simple.EncoderVersion == 0 ) {
sprintf ( simple.Encoder, "Buschmann 1.7.0...9, Klemm 0.90...1.05" );
} else {
switch ( simple.EncoderVersion % 10 ) {
case 0:
sprintf ( simple.Encoder, "Release %u.%u", simple.EncoderVersion/100, simple.EncoderVersion/10%10 );
break;
case 2: case 4: case 6: case 8:
sprintf ( simple.Encoder, "Beta %u.%02u", simple.EncoderVersion/100, simple.EncoderVersion%100 );
break;
default:
sprintf ( simple.Encoder, "--Alpha-- %u.%02u", simple.EncoderVersion/100, simple.EncoderVersion%100 );
break;
}
}
// if ( simple.PeakTitle == 0 ) // there is no correct PeakTitle contained within header
// simple.PeakTitle = (unsigned short)(EstimatedPeakTitle * 1.18);
// if ( simple.PeakAlbum == 0 )
// simple.PeakAlbum = simple.PeakTitle; // no correct PeakAlbum, use PeakTitle
//simple.SampleFreq = 44100; // AB: used by all files up to SV7
simple.Channels = 2;
return ERROR_CODE_OK;
}
// read information from SV4-SV6 header
int StreamInfo::ReadHeaderSV6 ( unsigned int HeaderData [8] )
{
//unsigned int HeaderData [8];
/*
if ( !fp->seek ( simple.HeaderPosition, SEEK_SET ) ) // seek to header start
return ERROR_CODE_FILE;
if ( fp->read ( HeaderData, sizeof HeaderData ) != sizeof HeaderData )
return ERROR_CODE_FILE;
*/
simple.Bitrate = (HeaderData[0] >> 23) & 0x01FF; // read the file-header (SV6 and below)
simple.IS = (HeaderData[0] >> 22) & 0x0001;
simple.MS = (HeaderData[0] >> 21) & 0x0001;
simple.StreamVersion = (HeaderData[0] >> 11) & 0x03FF;
simple.MaxBand = (HeaderData[0] >> 6) & 0x001F;
simple.BlockSize = (HeaderData[0] ) & 0x003F;
simple.Profile = 0;
simple.ProfileName = Stringify ( (unsigned)(-1) );
if ( simple.StreamVersion >= 5 )
simple.Frames = HeaderData[1]; // 32 bit
else
simple.Frames = (HeaderData[1]>>16); // 16 bit
simple.GainTitle = 0; // not supported
simple.PeakTitle = 0;
simple.GainAlbum = 0;
simple.PeakAlbum = 0;
simple.LastFrameSamples = 0;
simple.IsTrueGapless = 0;
simple.EncoderVersion = 0;
simple.Encoder[0] = '\0';
if ( simple.StreamVersion == 7 ) return ERROR_CODE_SV7BETA; // are there any unsupported parameters used?
if ( simple.Bitrate != 0 ) return ERROR_CODE_CBR;
if ( simple.IS != 0 ) return ERROR_CODE_IS;
if ( simple.BlockSize != 1 ) return ERROR_CODE_BLOCKSIZE;
if ( simple.StreamVersion < 6 ) // Bugfix: last frame was invalid for up to SV5
simple.Frames -= 1;
simple.SampleFreq = 44100; // AB: used by all files up to SV7
simple.Channels = 2;
if ( simple.StreamVersion < 4 || simple.StreamVersion > 7 )
return ERROR_CODE_INVALIDSV;
return ERROR_CODE_OK;
}
static unsigned int swap32(unsigned int val)
{
const unsigned char * src = (const unsigned char*)&val;
return (unsigned int)src[0] | ((unsigned int)src[1] << 8) | ((unsigned int)src[2] << 16) | ((unsigned int)src[3] << 24);
}
// reads file header and tags
int StreamInfo::ReadStreamInfo ( MPC_reader* fp)
{
unsigned int HeaderData[8];
int Error = 0;
//memset ( &simple, 0, sizeof (BasicData) ); // Reset Info-Data
if ( (simple.HeaderPosition = JumpID3v2 (fp)) < 0 ) // get header position
return ERROR_CODE_FILE;
if ( !fp->seek ( simple.HeaderPosition, SEEK_SET ) ) // seek to first byte of mpc data
return ERROR_CODE_FILE;
if ( fp->read ( HeaderData, 8*4 ) != 8*4 )
return ERROR_CODE_FILE;
if (!fp->seek(simple.HeaderPosition+6*4,SEEK_SET)) return ERROR_CODE_FILE;
/* if ( fp->read ( HeaderData, 6*4 ) != 6*4 )
return ERROR_CODE_FILE;
HeaderData[6]=HeaderData[7]=0;
*/
/*
if ( fp->seek ( 0L, SEEK_END ) != 0 ) // get filelength
return ERROR_CODE_FILE;
simple.TotalFileLength = fp->tell();
*/
simple.TotalFileLength = fp->get_size ();
simple.TagOffset = simple.TotalFileLength;
if ( memcmp ( HeaderData, "MP+", 3 ) == 0 )
{
#ifndef MPC_LITTLE_ENDIAN
{
unsigned int ptr;
for(ptr=0;ptr<8;ptr++) HeaderData[ptr] = swap32(HeaderData[ptr]);
}
#endif
simple.StreamVersion = HeaderData[0] >> 24;
if ( (simple.StreamVersion & 15) >= 8 ) // StreamVersion 8
Error = ReadHeaderSV8 ( fp );
else if ( (simple.StreamVersion & 15) == 7 ) // StreamVersion 7
Error = ReadHeaderSV7 ( HeaderData );
} else { // StreamVersion 4-6
Error = ReadHeaderSV6 ( HeaderData );
}
simple.PCMSamples = 1152 * simple.Frames - 576; // estimation, exact value needs too much time
if ( simple.PCMSamples > 0 )
simple.AverageBitrate = (simple.TagOffset - simple.HeaderPosition) * 8. * simple.SampleFreq / simple.PCMSamples;
else
simple.AverageBitrate = 0;
return Error;
}
/* end of in_mpc.c */
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