1923ebbc5fb164bd0695e37831bc859fb0efdc03
[deb_ffmpeg.git] / idctdsp_alpha.c
1 /*
2 * Copyright (c) 2002 Falk Hueffner <falk@debian.org>
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 #include "libavutil/attributes.h"
22 #include "libavcodec/idctdsp.h"
23 #include "idctdsp_alpha.h"
24 #include "asm.h"
25
26 void put_pixels_clamped_mvi_asm(const int16_t *block, uint8_t *pixels,
27 ptrdiff_t line_size);
28 void add_pixels_clamped_mvi_asm(const int16_t *block, uint8_t *pixels,
29 ptrdiff_t line_size);
30
31 void (*put_pixels_clamped_axp_p)(const int16_t *block, uint8_t *pixels,
32 ptrdiff_t line_size);
33 void (*add_pixels_clamped_axp_p)(const int16_t *block, uint8_t *pixels,
34 ptrdiff_t line_size);
35
36 #if 0
37 /* These functions were the base for the optimized assembler routines,
38 and remain here for documentation purposes. */
39 static void put_pixels_clamped_mvi(const int16_t *block, uint8_t *pixels,
40 ptrdiff_t line_size)
41 {
42 int i = 8;
43 uint64_t clampmask = zap(-1, 0xaa); /* 0x00ff00ff00ff00ff */
44
45 do {
46 uint64_t shorts0, shorts1;
47
48 shorts0 = ldq(block);
49 shorts0 = maxsw4(shorts0, 0);
50 shorts0 = minsw4(shorts0, clampmask);
51 stl(pkwb(shorts0), pixels);
52
53 shorts1 = ldq(block + 4);
54 shorts1 = maxsw4(shorts1, 0);
55 shorts1 = minsw4(shorts1, clampmask);
56 stl(pkwb(shorts1), pixels + 4);
57
58 pixels += line_size;
59 block += 8;
60 } while (--i);
61 }
62
63 void add_pixels_clamped_mvi(const int16_t *block, uint8_t *pixels,
64 ptrdiff_t line_size)
65 {
66 int h = 8;
67 /* Keep this function a leaf function by generating the constants
68 manually (mainly for the hack value ;-). */
69 uint64_t clampmask = zap(-1, 0xaa); /* 0x00ff00ff00ff00ff */
70 uint64_t signmask = zap(-1, 0x33);
71 signmask ^= signmask >> 1; /* 0x8000800080008000 */
72
73 do {
74 uint64_t shorts0, pix0, signs0;
75 uint64_t shorts1, pix1, signs1;
76
77 shorts0 = ldq(block);
78 shorts1 = ldq(block + 4);
79
80 pix0 = unpkbw(ldl(pixels));
81 /* Signed subword add (MMX paddw). */
82 signs0 = shorts0 & signmask;
83 shorts0 &= ~signmask;
84 shorts0 += pix0;
85 shorts0 ^= signs0;
86 /* Clamp. */
87 shorts0 = maxsw4(shorts0, 0);
88 shorts0 = minsw4(shorts0, clampmask);
89
90 /* Next 4. */
91 pix1 = unpkbw(ldl(pixels + 4));
92 signs1 = shorts1 & signmask;
93 shorts1 &= ~signmask;
94 shorts1 += pix1;
95 shorts1 ^= signs1;
96 shorts1 = maxsw4(shorts1, 0);
97 shorts1 = minsw4(shorts1, clampmask);
98
99 stl(pkwb(shorts0), pixels);
100 stl(pkwb(shorts1), pixels + 4);
101
102 pixels += line_size;
103 block += 8;
104 } while (--h);
105 }
106 #endif
107
108 av_cold void ff_idctdsp_init_alpha(IDCTDSPContext *c, AVCodecContext *avctx,
109 unsigned high_bit_depth)
110 {
111 /* amask clears all bits that correspond to present features. */
112 if (amask(AMASK_MVI) == 0) {
113 c->put_pixels_clamped = put_pixels_clamped_mvi_asm;
114 c->add_pixels_clamped = add_pixels_clamped_mvi_asm;
115 }
116
117 put_pixels_clamped_axp_p = c->put_pixels_clamped;
118 add_pixels_clamped_axp_p = c->add_pixels_clamped;
119
120 if (!high_bit_depth && !avctx->lowres &&
121 (avctx->idct_algo == FF_IDCT_AUTO ||
122 avctx->idct_algo == FF_IDCT_SIMPLEALPHA)) {
123 c->idct_put = ff_simple_idct_put_axp;
124 c->idct_add = ff_simple_idct_add_axp;
125 c->idct = ff_simple_idct_axp;
126 }
127 }