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);
123 for (i = 0; i < n; i++) {
125 for (k = 0; k < n/2; k++) {
126 a = (2 * i + 1 + (n / 2)) * (2 * k + 1);
127 f = cos(M_PI * a / (
double)(2 * n));
142 for (k = 0; k < n/2; k++) {
144 for (i = 0; i < n; i++) {
145 a = (2*M_PI*(2*i+1+n/2)*(2*k+1) / (4 * n));
146 s += input[i] * cos(a);
155 static void idct_ref(
float *output,
float *input,
int nbits)
162 for (i = 0; i < n; i++) {
164 for (k = 1; k < n; k++) {
165 a = M_PI*k*(i+0.5) / n;
166 s += input[k] * cos(a);
168 output[i] = 2 * s / n;
171 static void dct_ref(
float *output,
float *input,
int nbits)
178 for (k = 0; k < n; k++) {
180 for (i = 0; i < n; i++) {
181 a = M_PI*k*(i+0.5) / n;
182 s += input[i] * cos(a);
203 for (i = 0; i < n; i++) {
204 double e = fabsf(tab1[i] - (tab2[i] / scale)) /
RANGE;
207 i, tab1[i], tab2[i]);
221 "-h print this help\n"
226 "-i inverse transform test\n"
227 "-n b set the transform size to 2^b\n"
228 "-f x set scale factor for output data of (I)MDCT to x\n"
243 int main(
int argc,
char **argv)
260 int fft_nbits, fft_size;
267 c =
getopt(argc, argv,
"hsimrdn:f:c:");
304 fft_size = 1 << fft_nbits;
358 for (i = 0; i < fft_size; i++) {
383 memcpy(tab, tab1, fft_size *
sizeof(
FFTComplex));
387 fft_ref(tab_ref, tab1, fft_nbits);
393 fft_size_2 = fft_size >> 1;
396 tab1[fft_size_2].
im = 0;
397 for (i = 1; i < fft_size_2; i++) {
398 tab1[fft_size_2+i].
re = tab1[fft_size_2-i].
re;
399 tab1[fft_size_2+i].
im = -tab1[fft_size_2-i].
im;
402 memcpy(tab2, tab1, fft_size *
sizeof(
FFTSample));
403 tab2[1] = tab1[fft_size_2].
re;
406 fft_ref(tab_ref, tab1, fft_nbits);
407 for (i = 0; i < fft_size; i++) {
411 err =
check_diff((
float *)tab_ref, (
float *)tab, fft_size * 2, 0.5);
413 for (i = 0; i < fft_size; i++) {
414 tab2[i] = tab1[i].
re;
418 fft_ref(tab_ref, tab1, fft_nbits);
419 tab_ref[0].
im = tab_ref[fft_size_2].
re;
420 err =
check_diff((
float *)tab_ref, (
float *)tab2, fft_size, 1.0);
426 memcpy(tab, tab1, fft_size *
sizeof(
FFTComplex));
429 idct_ref(tab_ref, tab1, fft_nbits);
431 dct_ref(tab_ref, tab1, fft_nbits);
433 err =
check_diff((
float *)tab_ref, (
float *)tab, fft_size, 1.0);
450 for (it = 0; it < nb_its; it++) {
460 memcpy(tab, tab1, fft_size *
sizeof(
FFTComplex));
465 memcpy(tab2, tab1, fft_size *
sizeof(
FFTSample));
469 memcpy(tab2, tab1, fft_size *
sizeof(
FFTSample));
476 if (duration >= 1000000)
481 (
double)duration / nb_its,
482 (
double)duration / 1000000.0,
516 printf(
"Error: %d.\n", err);