[Speex-dev] speex corrupting input buffer?

[Steve Dekorte]

It seems that speex (speex 1.0.4 on OSX 10.3.9) is writing over the 
input buffer (with what looks like a sine wave).  Included below is a 
short program that demonstrates the problem. Is this a bug, or am I 
doing something wrong? I don't see this behavior mentioned in the docs.

I don't really need the input buffer, but I'm guessing this problem is 
related to a high pitched sound I'm getting after decoding since I get 
a similar sound if I just play the corrupted input buffer.

Thanks,
Steve

// ------------------------------------

#include <speex.h>
#include <stdio.h>

int main(int argc, const char *argv[])
{
     void *speexState;
     int frame_size;
     SpeexBits bits;
     float *buf;
     int i;

     speex_bits_init(&(bits));
     speexState = speex_encoder_init(&speex_wb_mode);
     speex_encoder_ctl(speexState, SPEEX_GET_FRAME_SIZE, &(frame_size));

     buf = (float *)calloc(1, frame_size * sizeof(float));

     for (i = 0; i < frame_size; i ++)
     {
	if (buf[i] != 0.0)
	{
	    printf("error, input buf not all zeros\n");
	    exit(1);
	}
     }

     speex_bits_reset(&(bits));
     speex_encode(speexState, buf, &(bits));
	
     for (i = 0; i < frame_size; i ++)
     {
	if (buf[i] != 0.0)
	{
	    printf("speex changed input buf[%i] of %i from 0.0 to %f\n", i, 
frame_size, buf[i]);
	}
     }
	
     free(buf);
}

// cc test.c -Iinclude -Llibspeex/.libs -lspeex -o test
// ./test