[Speex-dev] Error Executing sampledec in VC++

[Jim Crichton]

Mon,

You should be calling speex_bits_reset inside the loop.  This resets some pointers to the beginning of the bit buffer.  If you don't do this, the pointers will grow indefinitely.  Look at testenc.c, or at the modified versions that I posted yesterday for the TI DSPs.  You might want to get the example to run first, then modify it as you need.

- Jim
  ----- Original Message ----- 
  From: Mo Win 
  To: speex-dev at xiph.org 
  Sent: Monday, October 17, 2005 10:31 PM
  Subject: Re: [Speex-dev] Error Executing sampledec in VC++


  Hi Steve, thanks for the advice. I placed the appropriate functions outside the while statement but I still get this error at the while loop:

  First-chance exception at 0x004010fa in SPXDEC.exe: 0xC0000005: Access violation reading location 0x0000000c.
  Unhandled exception at 0x004010fa in SPXDEC.exe: 0xC0000005: Access violation reading location 0x0000000c.

  It looks like the same error. I've attached the code below

  Thanks,
  Mon

  Portion of the revised code:


      decstate = speex_decoder_init (&speex_nb_mode);
      // Set default options for decoding:
      temp = 1;
      speex_decoder_ctl(decstate, SPEEX_SET_ENH, &temp);

      // Initialize spxbits (structure SpeexBits)
      speex_bits_init (&spxbits);

      while (!(feof(fo)))     // this is where the problem starts
      {
          fread (&nbBytes, sizeof(int), 1, fo);
          fread (cbits, 1, nbBytes, fo);

          cout << "1"; // just to see whether the loop iterates

          speex_bits_read_from (&spxbits, cbits, nbBytes);
          speex_decode (decstate, &spxbits, pcm);


          // Copy 1 frame from float pcm to short spx
          for (n=0; n<FRAME_SIZE; n++)
              spx [n] = pcm [n];

          fwrite (spx, sizeof(short), FRAME_SIZE, fs);

      }
       // end of  loop
      // Entire file has been read, decoded and saved

      speex_decoder_destroy (decstate);
      speex_bits_destroy (&spxbits);
      fclose (fo);
      fclose (fs);
     
      cout << "Finished processing!\n";
  }


  On 10/18/05, Steve Russell <srussell at innernet.net> wrote:
    Mon,

    Here is feedback that I got concerning the access violation, i.e. the failure of the while loop below.  Does this solve the problem?

    Steve

    My guess is that speex_decoder_init() should be outside the while().. loop
    as speex_decoder_destroy() is also outside.
      ----- Original Message ----- 
      From: Mo Win 
      To: speex-dev at xiph.org 
      Sent: Monday, October 17, 2005 8:05 AM
      Subject: [Speex-dev] Error Executing sampledec in VC++


      hey guys, I just compiled an application similar to sampledec.c (for speex 1.1.10) and it was fine but when I executed it, the app exited without doing anything. I'm using MS VC 6.0 and this was all I got - First-chance exception in sampledec.exe : 0xC0000005: Access Violation. Has anyone encountered this / does anyone know how to deal with it? by the way, sampleenc executed perfectly... 

      When I removed the "while" loop in sampledec, the program executed fine (I placed printf's to check which lines were executed). I also tried running the loop only once (erasing only the while statement and retaining the code within it) and it worked fine again. Something seems to be happening during loop iteration that causes the program to terminate abnormally.. any clues? thanks very much for any tip..

      In gratitude,
      Mon

      (Below is my code. it's almost exactly like sampleenc except I read a file stream instead of stdin)

      #include "speex/speex.h"

      #include <stdio.h>
      #include <iostream.h>

      void main ()
      {
          // Definitions
          #define FRAME_SIZE 160
          #define FIXED_POINT

          // Variable Declarations
          FILE *fo, *fs;
          short spx [FRAME_SIZE];
          float pcm [FRAME_SIZE];
          char cbits [200];
          int nbBytes, n, temp;

          void *decstate;
          SpeexBits spxbits;


          // Program starts here:
          cout << "Starting spxdec...\n";
          fo = fopen("samp.spx","rb");

          if (fo == NULL)
              cout << "Error!\n";
          else
              cout << "Okay!\n";

          fs = fopen ("pcmfile", "wb");

          if (fs == NULL)
              cout << "Error creating file!\n";
          else
              cout << "File created!\n";


          while (!(feof(fo)))
          {
          decstate = speex_decoder_init (&speex_nb_mode);

          // Set default options for decoding:
          temp = 1;
          speex_decoder_ctl(decstate, SPEEX_SET_ENH, &temp);


          // Initialize spxbits (structure SpeexBits)
          speex_bits_init (&spxbits);


              fread (&nbBytes, sizeof(int), 1, fo);
              fread (cbits, 1, nbBytes, fo);

              cout << "1"; // just to see whether the loop iterates

              speex_bits_read_from (&spxbits, cbits, nbBytes);
              speex_decode (decstate, &spxbits, pcm);


              // Copy 1 frame from float pcm to short spx
              for (n=0; n<FRAME_SIZE; n++)
                  spx [n] = pcm [n];

              fwrite (spx, sizeof(short), FRAME_SIZE, fs);

          }
           // end of  loop
          // Entire file has been read, decoded and saved

          speex_decoder_destroy (decstate);
          speex_bits_destroy (&spxbits);
          fclose (fo);
          fclose (fs);
          
          cout << "Finished processing!\n";
      }




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