Question concerning SDL_CDxxx

[Gerd Schering-2]

Hi,

I'm new to SDL and I am not shure this is the wright list - but I didn't
find any other.

My Problem:
SDL_CDNumDrives reports the wrong number of drives: just 1 instead of 2
SDL_CDStatus reports: CD_STOPPED, while the CD is playing.
I am shure, that it is the wright drive (the one with the CD in) because
when I take off the CD, CD_TRAYEMPTY is reported.

Any hints?
Gerd
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[andreas-52]

Hello.

I'm not familiar with the SDL_CD-functions but please do tell which;
* version of SDL you are using
* what OS and version you are running
* are the cd-drives ide/sata/scsi

Have you tried this on another platform/computer to see if the same error appears?

Ideally also a small snippet of code which demonstrates the calls and which people can quickly compile and try on their systems.


Gerd Schering wrote:

> Hi,
>
> I'm new to SDL and I am not shure this is the wright list - but I didn't
> find any other.
>
> My Problem:
> SDL_CDNumDrives reports the wrong number of drives: just 1 instead of 2
> SDL_CDStatus reports: CD_STOPPED, while the CD is playing.
> I am shure, that it is the wright drive (the one with the CD in) because
> when I take off the CD, CD_TRAYEMPTY is reported.
>
> Any hints?
> Gerd
> _______________________________________________
> SDL mailing list
> SDL@...
> http://lists.libsdl.org/listinfo.cgi/sdl-libsdl.org
>

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[Gerd Schering-2]

andreas wrote:
> Hello.
>
> I'm not familiar with the SDL_CD-functions but please do tell which;
> * version of SDL you are using
1.2.13

> * what OS and version you are running
>  
linux with kernel 2.6.24.4 with desktop kde-3.5.9

> * are the cd-drives ide/sata/scsi
>  
both ide: /dev/hda and /dev/hdc

> Have you tried this on another platform/computer to see if the same error appears?
>  
It' s the only machine with 2 cd drives I own :-(.
But I tested it on my laptop with nearly identical installation, only difrference:
I use a laptop kernel and the cdrom is /dev/sr0 i.e. a sata device.
Results: SDL_CDNumDrives reports 1 drive, which is correct :-), but SDL_CDStatus reports: CD_STOPPED, while the CD is playing.
Could the KDE artsd daemon be the problem?

> Ideally also a small snippet of code which demonstrates the calls and which people can quickly compile and try on their systems.
>  
here it comes (I borrowed the whole thing from an internet SDL tutorial):

#include <SDL.h>
#include <stdlib.h>
#include <stdio.h>

int main(void) {
 
  printf("Initializing SDL.\n");
  if (SDL_Init(SDL_INIT_AUDIO|SDL_INIT_CDROM) < 0 ) {
        printf("Error: Could not initialize SDL: %s.\n", SDL_GetError());
        exit(-1);
  }
  atexit(SDL_Quit);
 
  printf("SDL initialized.\n");
 
  printf("CD drive(s): available: %d\n", SDL_CDNumDrives());
  int i;
  for ( i=0; i<SDL_CDNumDrives(); ++i ) {
        printf("Drive %d: \"%s\"\n", i, SDL_CDName(i));
  }
  SDL_CD *cdrom;
  CDstatus status;
  char *status_str;
 
  cdrom = SDL_CDOpen(0);
  if ( cdrom == NULL ) {
        fprintf(stderr, "Couldn't open default CD drive: %s\n", SDL_GetError());
        exit(2);
  }
 
  status = SDL_CDStatus(cdrom);
  switch (status) {
        case CD_TRAYEMPTY:
          status_str = "No CD.";
          break;
        case CD_STOPPED:
          status_str = "CD Stopped.";
          break;
        case CD_PLAYING:
          status_str = "CD Playing.";
          break;
        case CD_PAUSED:
          status_str = "CD Paused.";
          break;
        case CD_ERROR:
          status_str = "CD Error.";
          break;
        }
        printf("Drive status: %s\n", status_str);
        if ( status >= CD_PLAYING ) {
          int m, s, f;
          FRAMES_TO_MSF(cdrom->cur_frame, &m, &s, &f);
          printf("Currently playing track %d, %d:%2.2d\n",
          cdrom->track[cdrom->cur_track].id, m, s);
        }
  return(0);
}


Thanks a lot for your help!
Gerd

> Gerd Schering wrote:
>  
>> Hi,
>>
>> I'm new to SDL and I am not shure this is the wright list - but I didn't
>> find any other.
>>
>> My Problem:
>> SDL_CDNumDrives reports the wrong number of drives: just 1 instead of 2
>> SDL_CDStatus reports: CD_STOPPED, while the CD is playing.
>> I am shure, that it is the wright drive (the one with the CD in) because
>> when I take off the CD, CD_TRAYEMPTY is reported.
>>
>> Any hints?
>> Gerd
>> _______________________________________________
>> SDL mailing list
>> SDL@...
>> http://lists.libsdl.org/listinfo.cgi/sdl-libsdl.org
>>
>>    
> _______________________________________________
> SDL mailing list
> SDL@...
> http://lists.libsdl.org/listinfo.cgi/sdl-libsdl.org
>
>  

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[Ryan C. Gordon-2]

> Could the KDE artsd daemon be the problem?

Unlikely. The CD audio stuff hasn't been touched in a long time. It's
more likely that the Linux device interface changed.

We try a handful of reasonable devices, /dev/cdrom, /dev/hdX, /dev/sdX,
etc...we decide if they are CD-ROM drives with a Linux-specific ioctl()
call that may not return the information we expect anymore on modern
kernels.

(Or maybe works through /dev/cdrom but not /dev/hda, even if /dev/hda IS
a cd-rom).

It's possible you only have access to the second drive as root, too,
though. Double-check permissions.

As for why it reports STOPPED when playing: same reason. ioctl() change?

--ryan.

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