[Speex-dev] problems decoding speex... please help

Mo Win mowin.dev at gmail.com
Tue Dec 6 06:37:54 PST 2005

Hi all. I'm trying to decode speex using version 1.1.10's libspeex with
fixed_point enabled. copied the sample in the manual (1.1.11) with minor
revisions. While running the program, encountered this warning:

"Packet is larger than allocated buffer : 38"

when calling speex_bits_read_from (&bits, cbits, nBytes)

then my program terminated unexpectedly with errors (Unhandled exception at
0x10225e1f ( msvcr80d.dll) in sampleDEC.exe: 0xC0000005: Access violation
reading location 0x645c3a63.)

I declared cbits as char *cbits [500]. nBytes is 38, bit rate is 15000 bps.
I'm decoding a 'speex' file created using a program much like sampleENC. Can
anyone tell me what is wrong and how I can correct the problem? Thank you.
For your reference I'm attaching the code. Please feel free to ask me
questions if the information I provided is lacking. By the way, I am
compiling for Windows using VS2005 Beta2.



int main (int argc, char ** argv)
    printf ("sampleDEC.exe started!\n"); /**/

    int nBytes, FrameSize, BitRate;
    FILE *fin, *fout;
    char *inFile, *outFile, *PEnhancement;
    short out [500];
    char cbits [500];
    void *state;
    SpeexBits bits;

    state = speex_decoder_init (&speex_nb_mode);
    speex_decoder_ctl (state, SPEEX_GET_FRAME_SIZE, &FrameSize);

    inFile = argv [1];
    outFile = argv [2];
    PEnhancement = argv [3];

    fout = fopen (outFile, "w");
    if (fout == NULL)
        printf ("Error creating file\n");
        return 1;
    printf ("Successfully opened %s for writing! \n", outFile); /**/

    fin = fopen (inFile, "rb");
    if (fin == NULL)
        printf ("Error opening file\n");
        return 1;
    printf ("Successfully opened %s for decoding!\n\n", inFile); /**/

    fseek (fin,(sizeof(char))*12+sizeof(int),SEEK_SET); // because of the
way I encoded a PCM file

    speex_decoder_ctl (state, SPEEX_GET_BITRATE, &BitRate);
    printf ("decoding... BIT RATE: %i\n",BitRate);

    switch (*PEnhancement)
    { // Here I use BitRate to toggle Perceptual Enhancement
        case 'Y':
            BitRate = 1;
        case 'y':
            BitRate = 1;
        case 'N':
            BitRate = 0;
        case 'n':
            BitRate = 0;
            BitRate = 1;
    speex_decoder_ctl (state, SPEEX_SET_ENH, &BitRate);

    BitRate = 0; // Henceforth BitRate is used to count the number of frames

    while (1)
        fread(&nBytes, sizeof(int), 1, fin);

        if (feof(fin))

        fread(cbits, sizeof(char), nBytes, fin);

        speex_bits_read_from(&bits, cbits, nBytes);

        speex_decode_int(state, &bits, out);

        fwrite(out, sizeof(short), FrameSize, fout);

    printf ("nBytes is %i.\n",nBytes);
    printf ("Decoded %i frames\n",BitRate);


    fclose (fin);

    return 0;
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