2 * This file is part of FFmpeg.
4 * FFmpeg is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
9 * FFmpeg is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 #include "libavutil/attributes.h"
21 #include "libavutil/cpu.h"
22 #include "libavutil/x86/cpu.h"
23 #include "libavcodec/idctdsp.h"
24 #include "libavcodec/xvididct.h"
25 #include "idct_xvid.h"
28 static const uint8_t idct_sse2_row_perm[8] = { 0, 4, 1, 5, 2, 6, 3, 7 };
30 static av_cold void init_scantable_permutation_sse2(uint8_t *idct_permutation,
31 enum idct_permutation_type perm_type)
35 for (i = 0; i < 64; i++)
36 idct_permutation[i] = (i & 0x38) | idct_sse2_row_perm[i & 7];
39 av_cold void ff_xvididct_init_x86(IDCTDSPContext *c)
41 int cpu_flags = av_get_cpu_flags();
43 if (INLINE_MMX(cpu_flags)) {
44 c->idct_put = ff_idct_xvid_mmx_put;
45 c->idct_add = ff_idct_xvid_mmx_add;
46 c->idct = ff_idct_xvid_mmx;
49 if (INLINE_MMXEXT(cpu_flags)) {
50 c->idct_put = ff_idct_xvid_mmxext_put;
51 c->idct_add = ff_idct_xvid_mmxext_add;
52 c->idct = ff_idct_xvid_mmxext;
55 if (INLINE_SSE2(cpu_flags)) {
56 c->idct_put = ff_idct_xvid_sse2_put;
57 c->idct_add = ff_idct_xvid_sse2_add;
58 c->idct = ff_idct_xvid_sse2;
59 c->perm_type = FF_IDCT_PERM_SSE2;
61 init_scantable_permutation_sse2(c->idct_permutation, c->perm_type);