Re: audio check?

[Jim Langston]

John W. Eaton wrote:
> On  6-Sep-2007, Jim Langston wrote:
>
> | Isolating down a little the old fashion way
> | 
> | In oct-stream.cc
> | 
> |               printf("Getting ready to read\n") ;
> |               is.read (u.buf, sizeof (typename 
> | octave_type_traits<READ_T>::val_type));
> |               printf("Done Reading\n") ;
> | 
> | This method never returns
> | 
> | 
> | octave:1> A = [1:10; 1:10]/10;
> | octave:2> wavwrite("a.wav", A);
> | octave:3> [B, samples_per_sec, bits_per_sample] = wavread("a.wav");
> | Getting ready to read
> | ^C^CPress Control-C again to abort.
> | ^Cpanic: Interrupt -- stopping myself...
> | attempting to save variables to `octave-core'...
> | save to `octave-core' complete
>
> OK, but which call to fread in wavread is hanging?  That should be
> fairly easy to determine as wavread is a .m file.  It would be helpful
> to isolate this to a single call to fread rather than a call to
> wavread.  Also, since it seems you are the only one who can trigger
> this problem, I think you are going to have to narrow it down to
> something very specific, like "fread is called and it attempts to read
> the following data and it fails to return because it is looping here,
> because ...".
>
> Also, perhaps this should be on the bug list?
>   
I'm working with the thought that all problems I encounter are mine 
since Octave has not been
compiled and run under this env. (OpenSolaris, Sun Studio 12 compilers) 
- any pointers are
great as I dig them out. I changed wavread.m to include printf's around 
the fread's, I get:


octave:1> [B, samples_per_sec, bits_per_sample] = wavread("a.wav");
Getting ready to read
^C^CPress Control-C again to abort.
^Cpanic: Interrupt -- stopping myself...
Opening File
Opened File - OK: 5
First fread RIFF/WAVE signature
attempting to save variables to `octave-core'...
save to `octave-core' complete



I'm not getting past the first fread encountered in the wavread.m file

Debugging output shows the call to iostream, and then calls to 
c_file_ptr_buf and
in particular, the underflow method. I'm not sure what is triggering 
this, but the bump
value is always false and the value of c never varies from 82. My 
initial thought is
that the stream buffer is not getting read and cleaned out.

wavread.m snippet

......

 printf("Opening File\n");

 # open file for binary reading
 [fid, msg] = fopen (filename, "rb");
 if (fid < 0)
   error ("wavread: %s", msg);
 endif

#
#
   printf("Opened File - OK: %d\n", fid);

 ## check for RIFF/WAVE header
   printf ("First fread RIFF/WAVE signature\n");
 ck_id = char (fread (fid, 4))';
   printf ("First fread - OK - RIFF/WAVE signature\n");
 fseek (fid, 4, SEEK_CUR);
   printf ("Second fread RIFF/WAVE signature\n");
 wave_id = char (fread (fid, 4))';
 if (ck_id != "RIFF" || wave_id != "WAVE")
   fclose (fid);
   error ("wavread: file contains no RIFF/WAVE signature");
 endif


.....

> jwe
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>   


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Jim Langston
Sun Microsystems, Inc.

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