46 #define MUL16(a,b) ((a) * (b))
48 #define CMAC(pre, pim, are, aim, bre, bim) \
50 pre += (MUL16(are, bre) - MUL16(aim, bim));\
51 pim += (MUL16(are, bim) + MUL16(bre, aim));\
56 # define REF_SCALE(x, bits) (x)
60 # define REF_SCALE(x, bits) ((x) / (1<<(bits)))
76 for (i = 0; i < (n/2); i++) {
77 alpha = 2 * M_PI * (float)i / (
float)n;
90 double tmp_re, tmp_im, s, c;
95 for (i = 0; i < n; i++) {
99 for (j = 0; j < n; j++) {
100 k = (i * j) & (n - 1);
108 CMAC(tmp_re, tmp_im, c, s, q->
re, q->
im);
122 for (i = 0; i < n; i++) {
124 for (k = 0; k < n/2; k++) {
125 a = (2 * i + 1 + (n / 2)) * (2 * k + 1);
126 f = cos(M_PI * a / (
double)(2 * n));
141 for (k = 0; k < n/2; k++) {
143 for (i = 0; i < n; i++) {
144 a = (2*M_PI*(2*i+1+n/2)*(2*k+1) / (4 * n));
145 s += input[i] * cos(a);
152 static void idct_ref(
float *output,
float *input,
int nbits)
159 for (i = 0; i < n; i++) {
161 for (k = 1; k < n; k++) {
162 a = M_PI*k*(i+0.5) / n;
163 s += input[k] * cos(a);
165 output[i] = 2 * s / n;
168 static void dct_ref(
float *output,
float *input,
int nbits)
175 for (k = 0; k < n; k++) {
177 for (i = 0; i < n; i++) {
178 a = M_PI*k*(i+0.5) / n;
179 s += input[i] * cos(a);
199 for (i = 0; i < n; i++) {
200 double e = fabsf(tab1[i] - (tab2[i] / scale)) /
RANGE;
203 i, tab1[i], tab2[i]);
217 "-h print this help\n"
222 "-i inverse transform test\n"
223 "-n b set the transform size to 2^b\n"
224 "-f x set scale factor for output data of (I)MDCT to x\n"
239 int main(
int argc,
char **argv)
256 int fft_nbits, fft_size;
263 c =
getopt(argc, argv,
"hsimrdn:f:c:");
300 fft_size = 1 << fft_nbits;
348 for (i = 0; i < fft_size; i++) {
371 memcpy(tab, tab1, fft_size *
sizeof(
FFTComplex));
375 fft_ref(tab_ref, tab1, fft_nbits);
380 fft_size_2 = fft_size >> 1;
383 tab1[fft_size_2].
im = 0;
384 for (i = 1; i < fft_size_2; i++) {
385 tab1[fft_size_2+i].
re = tab1[fft_size_2-i].
re;
386 tab1[fft_size_2+i].
im = -tab1[fft_size_2-i].
im;
389 memcpy(tab2, tab1, fft_size *
sizeof(
FFTSample));
390 tab2[1] = tab1[fft_size_2].
re;
393 fft_ref(tab_ref, tab1, fft_nbits);
394 for (i = 0; i < fft_size; i++) {
398 err =
check_diff((
float *)tab_ref, (
float *)tab, fft_size * 2, 0.5);
400 for (i = 0; i < fft_size; i++) {
401 tab2[i] = tab1[i].
re;
405 fft_ref(tab_ref, tab1, fft_nbits);
406 tab_ref[0].
im = tab_ref[fft_size_2].
re;
407 err =
check_diff((
float *)tab_ref, (
float *)tab2, fft_size, 1.0);
411 memcpy(tab, tab1, fft_size *
sizeof(
FFTComplex));
416 dct_ref(tab_ref, tab1, fft_nbits);
418 err =
check_diff((
float *)tab_ref, (
float *)tab, fft_size, 1.0);
434 for (it = 0; it < nb_its; it++) {
444 memcpy(tab, tab1, fft_size *
sizeof(
FFTComplex));
449 memcpy(tab2, tab1, fft_size *
sizeof(
FFTSample));
453 memcpy(tab2, tab1, fft_size *
sizeof(
FFTSample));
460 if (duration >= 1000000)
465 (
double)duration / nb_its,
466 (
double)duration / 1000000.0,
494 printf(
"Error: %d.\n", err);