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IIR filter test program.

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Originally committed as revision 19443 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Alex Converse 2009-07-16 22:17:20 +00:00
parent 359a9979ad
commit ca0f1e5092
1 changed files with 36 additions and 0 deletions
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36
libavcodec/iirfilter.c
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@ -177,3 +177,39 @@ av_cold void ff_iir_filter_free_coeffs(struct FFIIRFilterCoeffs *coeffs)
av_free(coeffs);
}
#ifdef TEST
#define FILT_ORDER 4
#define SIZE 1024
int main(void)
{
struct FFIIRFilterCoeffs *fcoeffs = NULL;
struct FFIIRFilterState *fstate = NULL;
float cutoff_coeff = 0.4;
int16_t x[SIZE], y[SIZE];
int i;
FILE* fd;
fcoeffs = ff_iir_filter_init_coeffs(FF_FILTER_TYPE_BUTTERWORTH,
FF_FILTER_MODE_LOWPASS, FILT_ORDER,
cutoff_coeff, 0.0, 0.0);
fstate = ff_iir_filter_init_state(FILT_ORDER);
for (i = 0; i < SIZE; i++) {
x[i] = lrint(0.75 * INT16_MAX * sin(0.5*M_PI*i*i/SIZE));
}
ff_iir_filter(fcoeffs, fstate, SIZE, x, 1, y, 1);
fd = fopen("in.bin", "w");
fwrite(x, sizeof(x[0]), SIZE, fd);
fclose(fd);
fd = fopen("out.bin", "w");
fwrite(y, sizeof(y[0]), SIZE, fd);
fclose(fd);
ff_iir_filter_free_coeffs(fcoeffs);
ff_iir_filter_free_state(fstate);
return 0;
}
#endif /* TEST */