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Got BE and LE conversion backwards. Caused cdda-endianess determination

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to fail.
This commit is contained in:
rocky
2005-01-09 12:32:19 +00:00
parent b33726b00e
commit ba7d7c0684
2 changed files with 44 additions and 13 deletions
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36
lib/cdda_interface/common_interface.c
View File

@@ -1,7 +1,7 @@
/*
$Id: common_interface.c,v 1.5 2005/01/07 02:40:57 rocky Exp $
$Id: common_interface.c,v 1.6 2005/01/09 12:32:19 rocky Exp $
Copyright (C) 2004 Rocky Bernstein <rocky@panix.com>
Copyright (C) 2004, 2005 Rocky Bernstein <rocky@panix.com>
Copyright (C) 1998, 2002 Monty monty@xiph.org
This program is free software; you can redistribute it and/or modify
@@ -32,6 +32,14 @@
#include "utils.h"
#include "smallft.h"
/*! Determine endian-ness of the CD-drive based on reading data from
it.
rocky: As someone who didn't write the code, I have to say this is nothing
less than brilliant. An FFT is done bigendian and little endian and the
the transform is looked at to see which has data in the FFT (or audible)
portion. (Or so that's how I understand it.)
*/
int
data_bigendianp(cdrom_drive_t *d)
{
@@ -94,14 +102,14 @@ data_bigendianp(cdrom_drive_t *d)
beginsec*=CDIO_CD_FRAMESIZE_RAW/2;
/* un-interleave for an fft */
/* un-interleave for an FFT */
if(!zeroflag){
int j;
for(j=0;j<128;j++)
a[j]=UINT16_FROM_LE(buff[j*2+beginsec+460]);
a[j]=UINT16_FROM_BE(buff[j*2+beginsec+460]);
for(j=0;j<128;j++)
b[j]=UINT16_FROM_LE(buff[j*2+beginsec+461]);
b[j]=UINT16_FROM_BE(buff[j*2+beginsec+461]);
fft_forward(128,a,NULL,NULL);
fft_forward(128,b,NULL,NULL);
@@ -110,14 +118,16 @@ data_bigendianp(cdrom_drive_t *d)
lsb_energy+=fabs(a[j])+fabs(b[j]);
for(j=0;j<128;j++)
a[j]=UINT16_FROM_BE(buff[j*2+beginsec+460]);
a[j]=UINT16_FROM_LE(buff[j*2+beginsec+460]);
for(j=0;j<128;j++)
b[j]=UINT16_FROM_BE(buff[j*2+beginsec+461]);
b[j]=UINT16_FROM_LE(buff[j*2+beginsec+461]);
fft_forward(128,a,NULL,NULL);
fft_forward(128,b,NULL,NULL);
for(j=0;j<128;j++)msb_energy+=fabs(a[j])+fabs(b[j]);
for(j=0;j<128;j++)
msb_energy+=fabs(a[j])+fabs(b[j]);
}
}
if(lsb_energy<msb_energy){
@@ -164,10 +174,14 @@ data_bigendianp(cdrom_drive_t *d)
}
/************************************************************************/
/* Here we fix up a couple of things that will never happen. yeah,
right. The multisession stuff is from Hannu's code; it assumes it
knows the leadoud/leadin size. */
/*! Here we fix up a couple of things that will never happen. yeah,
right.
rocky OMITTED FOR NOW:
The multisession stuff is from Hannu's code; it assumes it knows
the leadout/leadin size.
*/
int
FixupTOC(cdrom_drive_t *d, track_t i_tracks)
{

21
lib/cdda_interface/common_interface.h
View File

@@ -1,7 +1,7 @@
/*
$Id: common_interface.h,v 1.3 2005/01/06 03:38:58 rocky Exp $
$Id: common_interface.h,v 1.4 2005/01/09 12:32:19 rocky Exp $
Copyright (C) 2004 Rocky Bernstein <rocky@panix.com>
Copyright (C) 2004, 2005 Rocky Bernstein <rocky@panix.com>
Copyright (C) 1998 Monty xiphmont@mit.edu
This program is free software; you can redistribute it and/or modify
@@ -33,7 +33,24 @@
extern int ioctl_ping_cdrom(int fd);
extern char *atapi_drive_info(int fd);
/*! Determine endian-ness of the CD-drive based on reading data from
it.
rocky: As someone who didn't write the code, I have to say this is nothing
less than brilliant. An FFT is done bigendian and little endian and the
the transform is looked at to see which has data in the FFT (or audible)
portion. (Or so that's how I understand it.)
*/
extern int data_bigendianp(cdrom_drive_t *d);
/*! Here we fix up a couple of things that will never happen. yeah,
right.
rocky OMITTED FOR NOW:
The multisession stuff is from Hannu's code; it assumes it knows
the leadout/leadin size.
*/
extern int FixupTOC(cdrom_drive_t *d, track_t tracks);
#endif /*_CDDA_COMMON_INTERFACE_H_*/