FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
idctdsp_alpha.c
Go to the documentation of this file.
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 
32  ptrdiff_t line_size);
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 
109  unsigned high_bit_depth)
110 {
111  /* amask clears all bits that correspond to present features. */
112  if (amask(AMASK_MVI) == 0) {
115  }
116 
119 
120  if (!high_bit_depth && !avctx->lowres &&
121  (avctx->idct_algo == FF_IDCT_AUTO)) {
125  }
126 }
#define minsw4(a, b)
Definition: asm.h:137
#define maxsw4(a, b)
Definition: asm.h:141
#define ldq(p)
Definition: asm.h:59
Macro definitions for various function/variable attributes.
static int16_t block[64]
Definition: dct.c:115
uint8_t
#define av_cold
Definition: attributes.h:82
void ff_simple_idct_axp(int16_t *block)
void(* add_pixels_clamped)(const int16_t *block, uint8_t *av_restrict pixels, ptrdiff_t line_size)
Definition: idctdsp.h:61
void ff_simple_idct_put_axp(uint8_t *dest, ptrdiff_t line_size, int16_t *block)
#define pkwb(a)
Definition: asm.h:144
int lowres
low resolution decoding, 1-> 1/2 size, 2->1/4 size
Definition: avcodec.h:2719
#define AMASK_MVI
Definition: asm.h:40
#define FF_IDCT_AUTO
Definition: avcodec.h:2684
void(* put_pixels_clamped)(const int16_t *block, uint8_t *av_restrict pixels, ptrdiff_t line_size)
Definition: idctdsp.h:55
#define amask
Definition: asm.h:99
void(* put_pixels_clamped_axp_p)(const int16_t *block, uint8_t *pixels, ptrdiff_t line_size)
Definition: idctdsp_alpha.c:31
void add_pixels_clamped_mvi_asm(const int16_t *block, uint8_t *pixels, ptrdiff_t line_size)
av_cold void ff_idctdsp_init_alpha(IDCTDSPContext *c, AVCodecContext *avctx, unsigned high_bit_depth)
#define stl(l, p)
Definition: asm.h:76
int idct_algo
IDCT algorithm, see FF_IDCT_* below.
Definition: avcodec.h:2683
typedef void(APIENTRY *FF_PFNGLACTIVETEXTUREPROC)(GLenum texture)
void put_pixels_clamped_mvi_asm(const int16_t *block, uint8_t *pixels, ptrdiff_t line_size)
main external API structure.
Definition: avcodec.h:1488
#define zap
Definition: asm.h:97
void(* idct_add)(uint8_t *dest, ptrdiff_t line_size, int16_t *block)
block -> idct -> add dest -> clip to unsigned 8 bit -> dest.
Definition: idctdsp.h:79
void(* idct_put)(uint8_t *dest, ptrdiff_t line_size, int16_t *block)
block -> idct -> clip to unsigned 8 bit -> dest.
Definition: idctdsp.h:72
static double c[64]
#define unpkbw(a)
Definition: asm.h:146
int pixels
Definition: avisynth_c.h:429
#define ldl(p)
Definition: asm.h:64
void ff_simple_idct_add_axp(uint8_t *dest, ptrdiff_t line_size, int16_t *block)
void(* add_pixels_clamped_axp_p)(const int16_t *block, uint8_t *pixels, ptrdiff_t line_size)
Definition: idctdsp_alpha.c:33
void(* idct)(int16_t *block)
Definition: idctdsp.h:65