FFmpeg
hevcdsp_template.c
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1 /*
2  * Copyright (c) Alexandra Hajkova
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 static void FUNC(ff_hevc_idct_4x4, BIT_DEPTH)(int16_t *coeffs, int col_limit)
22 {
23  const int shift = 7;
24  const int shift2 = 20 - BIT_DEPTH;
25  vec_s16 src_01, src_23;
26  vec_s32 res[4];
27  vec_s16 res_packed[2];
28 
29  src_01 = vec_ld(0, coeffs);
30  src_23 = vec_ld(16, coeffs);
31 
32  transform4x4(src_01, src_23, res, shift, coeffs);
33  src_01 = vec_packs(res[0], res[1]);
34  src_23 = vec_packs(res[2], res[3]);
35  scale(res, res_packed, shift);
36  // transpose
37  src_01 = vec_perm(res_packed[0], res_packed[1], mask[0]);
38  src_23 = vec_perm(res_packed[0], res_packed[1], mask[1]);
39 
40  transform4x4(src_01, src_23, res, shift2, coeffs);
41  scale(res, res_packed, shift2);
42  // transpose
43  src_01 = vec_perm(res_packed[0], res_packed[1], mask[0]);
44  src_23 = vec_perm(res_packed[0], res_packed[1], mask[1]);
45 
46  vec_st(src_01, 0, coeffs);
47  vec_st(src_23, 16, coeffs);
48 }
static int shift(int a, int b)
Definition: sonic.c:82
#define BIT_DEPTH
#define vec_s32
Definition: util_altivec.h:39
#define vec_s16
Definition: util_altivec.h:37
static const uint16_t mask[17]
Definition: lzw.c:38
static void FUNC(ff_hevc_idct_4x4, BIT_DEPTH)
static const int shift2[6]
Definition: dxa.c:51