* FFT/IFFT transforms
* Copyright (c) 2002 Fabrice Bellard.
*
- * This library is free software; you can redistribute it and/or
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
+ * version 2.1 of the License, or (at your option) any later version.
*
- * This library is distributed in the hope that it will be useful,
+ * FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
+ * License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
{
int i, j, m, n;
float alpha, c1, s1, s2;
+ int shuffle = 0;
+ int av_unused has_vectors;
s->nbits = nbits;
n = 1 << nbits;
s->imdct_calc = ff_imdct_calc;
s->exptab1 = NULL;
- /* compute constant table for HAVE_SSE version */
-#if defined(HAVE_MMX) \
- || (defined(HAVE_ALTIVEC) && !defined(ALTIVEC_USE_REFERENCE_C_CODE))
- {
- int has_vectors = mm_support();
-
- if (has_vectors) {
-#if defined(HAVE_MMX)
- if (has_vectors & MM_3DNOWEXT)
- s->imdct_calc = ff_imdct_calc_3dn2;
- if (has_vectors & MM_3DNOWEXT)
- /* 3DNowEx for Athlon(XP) */
- s->fft_calc = ff_fft_calc_3dn2;
- else if (has_vectors & MM_3DNOW)
- /* 3DNow! for K6-2/3 */
- s->fft_calc = ff_fft_calc_3dn;
- if (has_vectors & MM_SSE2)
- /* SSE for P4/K8 */
- s->fft_calc = ff_fft_calc_sse;
- else if ((has_vectors & MM_SSE) &&
- s->fft_calc == ff_fft_calc_c)
- /* SSE for P3 */
- s->fft_calc = ff_fft_calc_sse;
-#else /* HAVE_MMX */
- if (has_vectors & MM_ALTIVEC)
- s->fft_calc = ff_fft_calc_altivec;
+#ifdef HAVE_MMX
+ has_vectors = mm_support();
+ shuffle = 1;
+ if (has_vectors & MM_3DNOWEXT) {
+ /* 3DNowEx for K7/K8 */
+ s->imdct_calc = ff_imdct_calc_3dn2;
+ s->fft_calc = ff_fft_calc_3dn2;
+ } else if (has_vectors & MM_3DNOW) {
+ /* 3DNow! for K6-2/3 */
+ s->fft_calc = ff_fft_calc_3dn;
+ } else if (has_vectors & MM_SSE) {
+ /* SSE for P3/P4 */
+ s->imdct_calc = ff_imdct_calc_sse;
+ s->fft_calc = ff_fft_calc_sse;
+ } else {
+ shuffle = 0;
+ }
+#elif defined HAVE_ALTIVEC && !defined ALTIVEC_USE_REFERENCE_C_CODE
+ has_vectors = mm_support();
+ if (has_vectors & MM_ALTIVEC) {
+ s->fft_calc = ff_fft_calc_altivec;
+ shuffle = 1;
+ }
#endif
- }
- if (s->fft_calc != ff_fft_calc_c) {
- int np, nblocks, np2, l;
- FFTComplex *q;
- np = 1 << nbits;
- nblocks = np >> 3;
- np2 = np >> 1;
- s->exptab1 = av_malloc(np * 2 * sizeof(FFTComplex));
- if (!s->exptab1)
- goto fail;
- q = s->exptab1;
- do {
- for(l = 0; l < np2; l += 2 * nblocks) {
- *q++ = s->exptab[l];
- *q++ = s->exptab[l + nblocks];
+ /* compute constant table for HAVE_SSE version */
+ if (shuffle) {
+ int np, nblocks, np2, l;
+ FFTComplex *q;
- q->re = -s->exptab[l].im;
- q->im = s->exptab[l].re;
- q++;
- q->re = -s->exptab[l + nblocks].im;
- q->im = s->exptab[l + nblocks].re;
- q++;
- }
- nblocks = nblocks >> 1;
- } while (nblocks != 0);
- av_freep(&s->exptab);
- }
+ np = 1 << nbits;
+ nblocks = np >> 3;
+ np2 = np >> 1;
+ s->exptab1 = av_malloc(np * 2 * sizeof(FFTComplex));
+ if (!s->exptab1)
+ goto fail;
+ q = s->exptab1;
+ do {
+ for(l = 0; l < np2; l += 2 * nblocks) {
+ *q++ = s->exptab[l];
+ *q++ = s->exptab[l + nblocks];
+
+ q->re = -s->exptab[l].im;
+ q->im = s->exptab[l].re;
+ q++;
+ q->re = -s->exptab[l + nblocks].im;
+ q->im = s->exptab[l + nblocks].re;
+ q++;
+ }
+ nblocks = nblocks >> 1;
+ } while (nblocks != 0);
+ av_freep(&s->exptab);
}
-#endif
/* compute bit reverse table */