claunia/libcdio-osx
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Add routines which allow cdio object to be opened before cdda_open.

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common_interface.h: data_bigendianp() is now public (in cdio/cdda.h)
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rocky
2005-01-22 03:45:18 +00:00
parent 33ae20b89d
commit 1062cf3c74
3 changed files with 96 additions and 61 deletions
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27
lib/cdda_interface/common_interface.c
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@@ -1,5 +1,5 @@
/*
$Id: common_interface.c,v 1.8 2005/01/14 01:36:11 rocky Exp $
$Id: common_interface.c,v 1.9 2005/01/22 03:45:18 rocky Exp $
Copyright (C) 2004, 2005 Rocky Bernstein <rocky@panix.com>
Copyright (C) 1998, 2002 Monty monty@xiph.org
@@ -31,15 +31,20 @@
#include "utils.h"
#include "smallft.h"
/*! Determine endian-ness of the CD-drive based on reading data from
it.
/*! Determine Endian-ness of the CD-drive based on reading data from
it. Some drives return audio data Big Endian while some (most)
return data Little Endian. Drives known to return data bigendian are
SCSI drives from Kodak, Ricoh, HP, Philips, Plasmon, Grundig
CDR100IPW, and Mitsumi CD-R. ATAPI and MMC drives are little endian.
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)
rocky: As someone who didn't write the code, I have to say this is
nothing less than brilliant. An FFT is done both ways 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.)
*/
@return 1 if big-endian, 0 if little-endian, -1 if we couldn't
figure things out or some error.
*/
int
data_bigendianp(cdrom_drive_t *d)
{
@@ -149,17 +154,17 @@ data_bigendianp(cdrom_drive_t *d)
d->enable_cdda(d,0);
/* How did we vote? Be potentially noisy */
if(lsb_votes>msb_votes){
if (lsb_votes>msb_votes) {
char buffer[256];
cdmessage(d,"\n\tData appears to be coming back little endian.\n");
cdmessage(d,"\n\tData appears to be coming back Little Endian.\n");
sprintf(buffer,"\tcertainty: %d%%\n",(int)
(100.*lsb_votes/(lsb_votes+msb_votes)+.5));
cdmessage(d,buffer);
return(0);
}else{
} else {
if(msb_votes>lsb_votes){
char buffer[256];
cdmessage(d,"\n\tData appears to be coming back big endian.\n");
cdmessage(d,"\n\tData appears to be coming back Big Endian.\n");
sprintf(buffer,"\tcertainty: %d%%\n",(int)
(100.*msb_votes/(lsb_votes+msb_votes)+.5));
cdmessage(d,buffer);