/* Run one forward FFT test in test mode */
float RunOneForwardTest(int fft_log_size, int signal_type, float signal_value,
struct SnrResult* snr) {
OMX_F32* x;
OMX_FC32* y;
struct AlignedPtr* x_aligned;
struct AlignedPtr* y_aligned;
OMX_FC32* y_true;
OMX_INT n;
OMX_INT fft_spec_buffer_size;
OMXResult status;
OMXFFTSpec_R_F32 * fft_fwd_spec = NULL;
int fft_size;
fft_size = 1 << fft_log_size;
status = omxSP_FFTGetBufSize_R_F32(fft_log_size, &fft_spec_buffer_size);
if (verbose > 63) {
printf("fft_spec_buffer_size = %d\n", fft_spec_buffer_size);
}
fft_fwd_spec = (OMXFFTSpec_R_F32*) malloc(fft_spec_buffer_size);
status = omxSP_FFTInit_R_F32(fft_fwd_spec, fft_log_size);
if (status) {
fprintf(stderr, "Failed to init forward FFT: status = %d\n", status);
exit(1);
}
x_aligned = AllocAlignedPointer(32, sizeof(*x) * fft_size);
y_aligned = AllocAlignedPointer(32, sizeof(*y) * (fft_size + 2));
x = x_aligned->aligned_pointer_;
y = y_aligned->aligned_pointer_;
y_true = (OMX_FC32*) malloc(sizeof(*y_true) * (fft_size / 2 + 1));
GenerateSignal(x, y_true, fft_size, signal_type, signal_value);
if (verbose > 255) {
printf("input = %p - %p\n", x, x + fft_size);
printf("output = %p - %p\n", y, y + fft_size / 2 + 1);
DumpFFTSpec(fft_fwd_spec);
}
if (verbose > 63) {
printf("Signal\n");
DumpArrayFloat("x", fft_size, x);
printf("Expected FFT output\n");
DumpArrayComplexFloat("y", 1 + fft_size / 2, y_true);
}
status = ForwardRFFT(x, (OMX_F32*) y, fft_fwd_spec);
if (status) {
fprintf(stderr, "Forward FFT failed: status = %d\n", status);
exit(1);
}
if (verbose > 63) {
printf("FFT Output\n");
DumpArrayComplexFloat("y", 1 + fft_size / 2, y);
}
CompareComplexFloat(snr, y, y_true, fft_size / 2 + 1);
FreeAlignedPointer(x_aligned);
FreeAlignedPointer(y_aligned);
free(y_true);
free(fft_fwd_spec);
return snr->complex_snr_;
}
void TimeOneNE10RFFT(int count, int fft_log_size, float signal_value,
int signal_type) {
OMX_F32* x; /* Source */
OMX_FC32* y; /* Transform */
OMX_F32* z; /* Inverse transform */
OMX_F32* temp;
OMX_F32* y_true; /* True FFT */
struct AlignedPtr* x_aligned;
struct AlignedPtr* y_aligned;
struct AlignedPtr* z_aligned;
int n;
ne10_result_t status;
ne10_fft_r2c_cfg_float32_t fft_fwd_spec;
int fft_size;
struct timeval start_time;
struct timeval end_time;
double elapsed_time;
struct SnrResult snr_forward;
struct SnrResult snr_inverse;
fft_size = 1 << fft_log_size;
x_aligned = AllocAlignedPointer(32, sizeof(*x) * 4 * fft_size);
/* The transformed value is in CCS format and is has fft_size + 2 values */
y_aligned = AllocAlignedPointer(32, sizeof(*y) * (4 * fft_size + 2));
z_aligned = AllocAlignedPointer(32, sizeof(*z) * 4 * fft_size);
x = x_aligned->aligned_pointer_;
y = y_aligned->aligned_pointer_;
z = z_aligned->aligned_pointer_;
y_true = (OMX_F32*) malloc(sizeof(*y_true) * (fft_size + 2));
GenerateRealFloatSignal(x, (struct ComplexFloat*) y_true, fft_size, signal_type,
signal_value);
fft_fwd_spec = ne10_fft_alloc_r2c_float32(fft_size);
if (!fft_fwd_spec) {
fprintf(stderr, "NE10 RFFT: Cannot initialize FFT structure for order %d\n", fft_log_size);
return;
}
if (do_forward_test) {
GetUserTime(&start_time);
for (n = 0; n < count; ++n) {
ne10_fft_r2c_1d_float32_neon((ne10_fft_cpx_float32_t *) y,
x,
fft_fwd_spec);
}
GetUserTime(&end_time);
elapsed_time = TimeDifference(&start_time, &end_time);
CompareComplexFloat(&snr_forward, (OMX_FC32*) y, (OMX_FC32*) y_true, fft_size / 2 + 1);
PrintResult("Forward NE10 RFFT", fft_log_size, elapsed_time, count, snr_forward.complex_snr_);
if (verbose >= 255) {
printf("FFT Actual:\n");
DumpArrayComplexFloat("y", fft_size / 2 + 1, y);
printf("FFT Expected:\n");
DumpArrayComplexFloat("true", fft_size / 2 + 1, (OMX_FC32*) y_true);
}
}
if (do_inverse_test) {
// Ne10 FFTs destroy the input.
GetUserTime(&start_time);
for (n = 0; n < count; ++n) {
//memcpy(y, y_true, (fft_size >> 1) * sizeof(*y));
// The inverse appears not to be working.
ne10_fft_c2r_1d_float32_neon(z,
(ne10_fft_cpx_float32_t *) y_true,
fft_fwd_spec);
}
GetUserTime(&end_time);
elapsed_time = TimeDifference(&start_time, &end_time);
CompareFloat(&snr_inverse, (OMX_F32*) z, (OMX_F32*) x, fft_size);
PrintResult("Inverse NE10 RFFT", fft_log_size, elapsed_time, count, snr_inverse.complex_snr_);
if (verbose >= 255) {
printf("IFFT Actual:\n");
DumpArrayFloat("z", fft_size, z);
printf("IFFT Expected:\n");
DumpArrayFloat("x", fft_size, x);
}
}
ne10_fft_destroy_r2c_float32(fft_fwd_spec);
FreeAlignedPointer(x_aligned);
FreeAlignedPointer(y_aligned);
FreeAlignedPointer(z_aligned);
}
void TimeOneNE10FFT(int count, int fft_log_size, float signal_value,
int signal_type) {
struct AlignedPtr* x_aligned;
struct AlignedPtr* y_aligned;
struct AlignedPtr* z_aligned;
struct ComplexFloat* x;
struct ComplexFloat* y;
OMX_FC32* z;
struct ComplexFloat* y_true;
int n;
ne10_result_t status;
ne10_fft_cfg_float32_t fft_fwd_spec;
int fft_size;
struct timeval start_time;
struct timeval end_time;
double elapsed_time;
struct SnrResult snr_forward;
struct SnrResult snr_inverse;
fft_size = 1 << fft_log_size;
x_aligned = AllocAlignedPointer(32, sizeof(*x) * fft_size);
y_aligned = AllocAlignedPointer(32, sizeof(*y) * 2 * fft_size);
z_aligned = AllocAlignedPointer(32, sizeof(*z) * 2 * fft_size);
y_true = (struct ComplexFloat*) malloc(sizeof(*y_true) * fft_size);
x = x_aligned->aligned_pointer_;
y = y_aligned->aligned_pointer_;
z = z_aligned->aligned_pointer_;
GenerateTestSignalAndFFT(x, y_true, fft_size, signal_type, signal_value, 0);
fft_fwd_spec = ne10_fft_alloc_c2c_float32(fft_size);
if (!fft_fwd_spec) {
fprintf(stderr, "NE10 FFT: Cannot initialize FFT structure for order %d\n", fft_log_size);
return;
}
if (do_forward_test) {
GetUserTime(&start_time);
for (n = 0; n < count; ++n) {
ne10_fft_c2c_1d_float32_neon((ne10_fft_cpx_float32_t *) y,
(ne10_fft_cpx_float32_t *) x,
fft_fwd_spec,
0);
}
GetUserTime(&end_time);
elapsed_time = TimeDifference(&start_time, &end_time);
CompareComplexFloat(&snr_forward, (OMX_FC32*) y, (OMX_FC32*) y_true, fft_size);
PrintResult("Forward NE10 FFT", fft_log_size, elapsed_time, count, snr_forward.complex_snr_);
if (verbose >= 255) {
printf("Input data:\n");
DumpArrayComplexFloat("x", fft_size, (OMX_FC32*) x);
printf("FFT Actual:\n");
DumpArrayComplexFloat("y", fft_size, (OMX_FC32*) y);
printf("FFT Expected:\n");
DumpArrayComplexFloat("true", fft_size, (OMX_FC32*) y_true);
}
}
if (do_inverse_test) {
GetUserTime(&start_time);
for (n = 0; n < count; ++n) {
ne10_fft_c2c_1d_float32_neon((ne10_fft_cpx_float32_t *) z,
(ne10_fft_cpx_float32_t *) y_true,
fft_fwd_spec,
1);
}
GetUserTime(&end_time);
elapsed_time = TimeDifference(&start_time, &end_time);
CompareComplexFloat(&snr_inverse, (OMX_FC32*) z, (OMX_FC32*) x, fft_size);
PrintResult("Inverse NE10 FFT", fft_log_size, elapsed_time, count, snr_inverse.complex_snr_);
if (verbose >= 255) {
printf("Input data:\n");
DumpArrayComplexFloat("y", fft_size, (OMX_FC32*) y_true);
printf("IFFT Actual:\n");
DumpArrayComplexFloat("z", fft_size, z);
printf("IFFT Expected:\n");
DumpArrayComplexFloat("x", fft_size, (OMX_FC32*) x);
}
}
ne10_fft_destroy_c2c_float32(fft_fwd_spec);
FreeAlignedPointer(x_aligned);
FreeAlignedPointer(y_aligned);
FreeAlignedPointer(z_aligned);
free(y_true);
}
float RunOneInverseTest(int fft_log_size, int signal_type, float signal_value,
struct SnrResult* snr) {
OMX_FC32* x;
OMX_FC32* y;
OMX_FC32* z;
struct AlignedPtr* x_aligned;
struct AlignedPtr* y_aligned;
struct AlignedPtr* z_aligned;
OMX_INT n, fft_spec_buffer_size;
OMXResult status;
OMXFFTSpec_C_FC32 * fft_fwd_spec = NULL;
OMXFFTSpec_C_FC32 * fft_inv_spec = NULL;
int fft_size;
fft_size = 1 << fft_log_size;
status = omxSP_FFTGetBufSize_C_FC32(fft_log_size, &fft_spec_buffer_size);
if (verbose > 3) {
printf("fft_spec_buffer_size = %d\n", fft_spec_buffer_size);
}
fft_inv_spec = (OMXFFTSpec_C_FC32*)malloc(fft_spec_buffer_size);
status = omxSP_FFTInit_C_FC32(fft_inv_spec, fft_log_size);
if (status) {
fprintf(stderr, "Failed to init backward FFT: status = %d, order %d\n",
status, fft_log_size);
exit(1);
}
x_aligned = AllocAlignedPointer(32, sizeof(*x) * fft_size);
y_aligned = AllocAlignedPointer(32, sizeof(*y) * (fft_size + 2));
z_aligned = AllocAlignedPointer(32, sizeof(*z) * fft_size);
x = x_aligned->aligned_pointer_;
y = y_aligned->aligned_pointer_;
z = z_aligned->aligned_pointer_;
GenerateSignal(x, y, fft_size, signal_type, signal_value);
if (verbose > 63) {
printf("Inverse FFT Input Signal\n");
DumpArrayComplexFloat("x", fft_size, y);
printf("Expected Inverse FFT output\n");
DumpArrayComplexFloat("x", fft_size, x);
}
status = InverseFFT(y, z, fft_inv_spec);
if (status) {
fprintf(stderr, "Inverse FFT failed: status = %d\n", status);
exit(1);
}
if (verbose > 63) {
printf("Actual Inverse FFT Output\n");
DumpArrayComplexFloat("z", fft_size, z);
}
CompareComplexFloat(snr, z, x, fft_size);
FreeAlignedPointer(x_aligned);
FreeAlignedPointer(y_aligned);
FreeAlignedPointer(z_aligned);
free(fft_inv_spec);
return snr->complex_snr_;
}
void TimeOneFloatFFT(int count, int fft_log_size, float signal_value,
int signal_type) {
struct AlignedPtr* x_aligned;
struct AlignedPtr* y_aligned;
struct AlignedPtr* z_aligned;
struct AlignedPtr* y_true_aligned;
struct ComplexFloat* x;
struct ComplexFloat* y;
OMX_FC32* z;
struct ComplexFloat* y_true;
OMX_INT n, fft_spec_buffer_size;
OMXFFTSpec_C_FC32 * fft_fwd_spec = NULL;
OMXFFTSpec_C_FC32 * fft_inv_spec = NULL;
int fft_size;
struct timeval start_time;
struct timeval end_time;
double elapsed_time;
struct SnrResult snr_forward;
struct SnrResult snr_inverse;
fft_size = 1 << fft_log_size;
x_aligned = AllocAlignedPointer(32, sizeof(*x) * fft_size);
y_aligned = AllocAlignedPointer(32, sizeof(*y) * (fft_size + 2));
z_aligned = AllocAlignedPointer(32, sizeof(*z) * fft_size);
y_true_aligned = AllocAlignedPointer(32, sizeof(*z) * fft_size);
x = x_aligned->aligned_pointer_;
y = y_aligned->aligned_pointer_;
z = z_aligned->aligned_pointer_;
y_true = y_true_aligned->aligned_pointer_;
GenerateTestSignalAndFFT(x, y_true, fft_size, signal_type, signal_value, 0);
omxSP_FFTGetBufSize_C_FC32(fft_log_size, &fft_spec_buffer_size);
fft_fwd_spec = (OMXFFTSpec_C_FC32*) malloc(fft_spec_buffer_size);
fft_inv_spec = (OMXFFTSpec_C_FC32*) malloc(fft_spec_buffer_size);
omxSP_FFTInit_C_FC32(fft_fwd_spec, fft_log_size);
omxSP_FFTInit_C_FC32(fft_inv_spec, fft_log_size);
if (do_forward_test) {
GetUserTime(&start_time);
for (n = 0; n < count; ++n) {
FORWARD_FLOAT_FFT((OMX_FC32*) x, (OMX_FC32*) y, fft_fwd_spec);
}
GetUserTime(&end_time);
elapsed_time = TimeDifference(&start_time, &end_time);
CompareComplexFloat(&snr_forward, (OMX_FC32*) y, (OMX_FC32*) y_true, fft_size);
PrintResult("Forward Float FFT", fft_log_size, elapsed_time, count, snr_forward.complex_snr_);
}
if (do_inverse_test) {
GetUserTime(&start_time);
for (n = 0; n < count; ++n) {
INVERSE_FLOAT_FFT((OMX_FC32*) y_true, z, fft_inv_spec);
}
GetUserTime(&end_time);
elapsed_time = TimeDifference(&start_time, &end_time);
CompareComplexFloat(&snr_inverse, (OMX_FC32*) z, (OMX_FC32*) x, fft_size);
PrintResult("Inverse Float FFT", fft_log_size, elapsed_time, count, snr_inverse.complex_snr_);
}
FreeAlignedPointer(x_aligned);
FreeAlignedPointer(y_aligned);
FreeAlignedPointer(z_aligned);
FreeAlignedPointer(y_true_aligned);
free(fft_fwd_spec);
free(fft_inv_spec);
}
void TimeOneFloatRFFT(int count, int fft_log_size, float signal_value,
int signal_type) {
OMX_F32* x; /* Source */
OMX_F32* y; /* Transform */
OMX_F32* z; /* Inverse transform */
OMX_F32* y_true; /* True FFT */
struct AlignedPtr* x_aligned;
struct AlignedPtr* y_aligned;
struct AlignedPtr* z_aligned;
struct AlignedPtr* y_true_aligned;
OMX_INT n, fft_spec_buffer_size;
OMXResult status;
OMXFFTSpec_R_F32 * fft_fwd_spec = NULL;
OMXFFTSpec_R_F32 * fft_inv_spec = NULL;
int fft_size;
struct timeval start_time;
struct timeval end_time;
double elapsed_time;
struct SnrResult snr_forward;
struct SnrResult snr_inverse;
fft_size = 1 << fft_log_size;
x_aligned = AllocAlignedPointer(32, sizeof(*x) * fft_size);
/* The transformed value is in CCS format and is has fft_size + 2 values */
y_aligned = AllocAlignedPointer(32, sizeof(*y) * (fft_size + 2));
z_aligned = AllocAlignedPointer(32, sizeof(*z) * fft_size);
y_true_aligned = AllocAlignedPointer(32, sizeof(*z) * (fft_size + 2));
x = x_aligned->aligned_pointer_;
y = y_aligned->aligned_pointer_;
z = z_aligned->aligned_pointer_;
y_true = y_true_aligned->aligned_pointer_;
GenerateRealFloatSignal(x, (OMX_FC32*) y_true, fft_size, signal_type,
signal_value);
status = omxSP_FFTGetBufSize_R_F32(fft_log_size, &fft_spec_buffer_size);
fft_fwd_spec = (OMXFFTSpec_R_F32*) malloc(fft_spec_buffer_size);
fft_inv_spec = (OMXFFTSpec_R_F32*) malloc(fft_spec_buffer_size);
status = omxSP_FFTInit_R_F32(fft_fwd_spec, fft_log_size);
status = omxSP_FFTInit_R_F32(fft_inv_spec, fft_log_size);
if (do_forward_test) {
GetUserTime(&start_time);
for (n = 0; n < count; ++n) {
FORWARD_FLOAT_RFFT(x, y, fft_fwd_spec);
}
GetUserTime(&end_time);
elapsed_time = TimeDifference(&start_time, &end_time);
CompareComplexFloat(&snr_forward, (OMX_FC32*) y, (OMX_FC32*) y_true, fft_size / 2 + 1);
PrintResult("Forward Float RFFT", fft_log_size, elapsed_time, count, snr_forward.complex_snr_);
}
if (do_inverse_test) {
GetUserTime(&start_time);
for (n = 0; n < count; ++n) {
INVERSE_FLOAT_RFFT(y_true, z, fft_inv_spec);
}
GetUserTime(&end_time);
elapsed_time = TimeDifference(&start_time, &end_time);
CompareFloat(&snr_inverse, (OMX_F32*) z, (OMX_F32*) x, fft_size);
PrintResult("Inverse Float RFFT", fft_log_size, elapsed_time, count, snr_inverse.complex_snr_);
}
FreeAlignedPointer(x_aligned);
FreeAlignedPointer(y_aligned);
FreeAlignedPointer(z_aligned);
free(fft_fwd_spec);
free(fft_inv_spec);
}
void TimeOnePfFFT(int count, int fft_log_size, float signal_value,
int signal_type) {
struct AlignedPtr* x_aligned;
struct AlignedPtr* y_aligned;
struct AlignedPtr* z_aligned;
struct AlignedPtr* y_true_aligned;
struct ComplexFloat* x;
struct ComplexFloat* y;
OMX_FC32* z;
struct ComplexFloat* y_true;
int n;
int fft_size;
struct timeval start_time;
struct timeval end_time;
double elapsed_time;
PFFFT_Setup *s;
struct SnrResult snr_forward;
struct SnrResult snr_inverse;
fft_size = 1 << fft_log_size;
x_aligned = AllocAlignedPointer(32, sizeof(*x) * fft_size);
y_aligned = AllocAlignedPointer(32, sizeof(*y) * (fft_size + 2));
z_aligned = AllocAlignedPointer(32, sizeof(*z) * fft_size);
y_true_aligned = AllocAlignedPointer(32, sizeof(*y_true) * fft_size);
x = x_aligned->aligned_pointer_;
y = y_aligned->aligned_pointer_;
z = z_aligned->aligned_pointer_;
y_true = y_true_aligned->aligned_pointer_;
s = pffft_new_setup(fft_size, PFFFT_COMPLEX);
if (!s) {
fprintf(stderr, "TimeOnePfFFT: Could not initialize structure for order %d\n",
fft_log_size);
}
GenerateTestSignalAndFFT(x, y_true, fft_size, signal_type, signal_value, 0);
if (do_forward_test) {
GetUserTime(&start_time);
for (n = 0; n < count; ++n) {
pffft_transform_ordered(s, (float*)x, (float*)y, NULL, PFFFT_FORWARD);
}
GetUserTime(&end_time);
elapsed_time = TimeDifference(&start_time, &end_time);
CompareComplexFloat(&snr_forward, (OMX_FC32*) y, (OMX_FC32*) y_true, fft_size);
PrintResult("Forward PFFFT FFT", fft_log_size, elapsed_time, count, snr_forward.complex_snr_);
if (verbose >= 255) {
printf("FFT Actual:\n");
DumpArrayComplexFloat("y", fft_size, (OMX_FC32*) y);
printf("FFT Expected:\n");
DumpArrayComplexFloat("true", fft_size, (OMX_FC32*) y_true);
}
}
if (do_inverse_test) {
float scale = 1.0 / fft_size;
memcpy(y, y_true, sizeof(*y) * (fft_size + 2));
GetUserTime(&start_time);
for (n = 0; n < count; ++n) {
int m;
pffft_transform_ordered(s, (float*)y_true, (float*)z, NULL, PFFFT_BACKWARD);
/*
* Need to include cost of scaling the inverse
*/
ScaleVector((OMX_F32*) z, 2 * fft_size, fft_size);
}
GetUserTime(&end_time);
elapsed_time = TimeDifference(&start_time, &end_time);
CompareComplexFloat(&snr_inverse, (OMX_FC32*) z, (OMX_FC32*) x, fft_size);
PrintResult("Inverse PFFFT FFT", fft_log_size, elapsed_time, count, snr_inverse.complex_snr_);
if (verbose >= 255) {
printf("IFFT Actual:\n");
DumpArrayComplexFloat("z", fft_size, z);
printf("IFFT Expected:\n");
DumpArrayComplexFloat("x", fft_size, (OMX_FC32*) x);
}
}
FreeAlignedPointer(x_aligned);
FreeAlignedPointer(y_aligned);
FreeAlignedPointer(z_aligned);
FreeAlignedPointer(y_true_aligned);
pffft_destroy_setup(s);
}
void TimeOnePfRFFT(int count, int fft_log_size, float signal_value,
int signal_type) {
struct AlignedPtr* x_aligned;
struct AlignedPtr* y_aligned;
struct AlignedPtr* z_aligned;
struct AlignedPtr* y_tmp_aligned;
float* x;
struct ComplexFloat* y;
OMX_F32* z;
float* y_true;
float* y_tmp;
int n;
int fft_size;
struct timeval start_time;
struct timeval end_time;
double elapsed_time;
PFFFT_Setup *s;
struct SnrResult snr_forward;
struct SnrResult snr_inverse;
fft_size = 1 << fft_log_size;
x_aligned = AllocAlignedPointer(32, sizeof(*x) * fft_size);
y_aligned = AllocAlignedPointer(32, sizeof(*y) * (fft_size + 2));
z_aligned = AllocAlignedPointer(32, sizeof(*z) * fft_size);
y_tmp_aligned = AllocAlignedPointer(32, sizeof(*y_tmp) * (fft_size + 2));
y_true = (float*) malloc(sizeof(*y_true) * 2 * fft_size);
x = x_aligned->aligned_pointer_;
y = y_aligned->aligned_pointer_;
z = z_aligned->aligned_pointer_;
y_tmp = y_tmp_aligned->aligned_pointer_;
s = pffft_new_setup(fft_size, PFFFT_REAL);
if (!s) {
fprintf(stderr, "TimeOnePfRFFT: Could not initialize structure for order %d\n",
fft_log_size);
}
GenerateRealFloatSignal(x, (struct ComplexFloat*) y_true, fft_size, signal_type, signal_value);
if (do_forward_test) {
GetUserTime(&start_time);
for (n = 0; n < count; ++n) {
pffft_transform_ordered(s, (float*)x, (float*)y, NULL, PFFFT_FORWARD);
}
GetUserTime(&end_time);
elapsed_time = TimeDifference(&start_time, &end_time);
/*
* Arrange the output of the FFT to match the expected output.
*/
y[fft_size / 2].Re = y[0].Im;
y[fft_size / 2].Im = 0;
y[0].Im = 0;
CompareComplexFloat(&snr_forward, (OMX_FC32*) y, (OMX_FC32*) y_true, fft_size / 2 + 1);
PrintResult("Forward PFFFT RFFT", fft_log_size, elapsed_time, count, snr_forward.complex_snr_);
if (verbose >= 255) {
printf("FFT Actual:\n");
DumpArrayComplexFloat("y", fft_size / 2 + 1, (OMX_FC32*) y);
printf("FFT Expected:\n");
DumpArrayComplexFloat("true", fft_size / 2 + 1, (OMX_FC32*) y_true);
}
}
if (do_inverse_test) {
float scale = 1.0 / fft_size;
/* Copy y_true to true, but arrange the values according to what rdft wants. */
memcpy(y_tmp, y_true, sizeof(y_tmp[0]) * fft_size);
y_tmp[1] = y_true[fft_size / 2];
GetUserTime(&start_time);
for (n = 0; n < count; ++n) {
int m;
pffft_transform_ordered(s, (float*)y_tmp, (float*)z, NULL, PFFFT_BACKWARD);
/*
* Need to include cost of scaling the inverse
*/
ScaleVector(z, fft_size, fft_size);
}
GetUserTime(&end_time);
elapsed_time = TimeDifference(&start_time, &end_time);
CompareFloat(&snr_inverse, (OMX_F32*) z, (OMX_F32*) x, fft_size);
PrintResult("Inverse PFFFT RFFT", fft_log_size, elapsed_time, count, snr_inverse.complex_snr_);
if (verbose >= 255) {
printf("IFFT Actual:\n");
DumpArrayFloat("z", fft_size, z);
printf("IFFT Expected:\n");
DumpArrayFloat("x", fft_size, x);
}
}
FreeAlignedPointer(x_aligned);
FreeAlignedPointer(y_aligned);
FreeAlignedPointer(z_aligned);
FreeAlignedPointer(y_tmp_aligned);
pffft_destroy_setup(s);
free(y_true);
}