Libav
idctdsp.c
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1 /*
2  * This file is part of Libav.
3  *
4  * Libav 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.
8  *
9  * Libav 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.
13  *
14  * You should have received a copy of the GNU Lesser General Public
15  * License along with Libav; if not, write to the Free Software
16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17  */
18 
19 #include "config.h"
20 #include "libavutil/attributes.h"
21 #include "libavutil/common.h"
22 #include "avcodec.h"
23 #include "dct.h"
24 #include "faanidct.h"
25 #include "idctdsp.h"
26 #include "simple_idct.h"
27 
28 av_cold void ff_init_scantable(uint8_t *permutation, ScanTable *st,
29  const uint8_t *src_scantable)
30 {
31  int i, end;
32 
33  st->scantable = src_scantable;
34 
35  for (i = 0; i < 64; i++) {
36  int j = src_scantable[i];
37  st->permutated[i] = permutation[j];
38  }
39 
40  end = -1;
41  for (i = 0; i < 64; i++) {
42  int j = st->permutated[i];
43  if (j > end)
44  end = j;
45  st->raster_end[i] = end;
46  }
47 }
48 
50  enum idct_permutation_type perm_type)
51 {
52  int i;
53 
54  if (ARCH_X86)
55  if (ff_init_scantable_permutation_x86(idct_permutation,
56  perm_type))
57  return;
58 
59  switch (perm_type) {
60  case FF_IDCT_PERM_NONE:
61  for (i = 0; i < 64; i++)
62  idct_permutation[i] = i;
63  break;
65  for (i = 0; i < 64; i++)
66  idct_permutation[i] = (i & 0x38) | ((i & 6) >> 1) | ((i & 1) << 2);
67  break;
69  for (i = 0; i < 64; i++)
70  idct_permutation[i] = ((i & 7) << 3) | (i >> 3);
71  break;
73  for (i = 0; i < 64; i++)
74  idct_permutation[i] = (i & 0x24) | ((i & 3) << 3) | ((i >> 3) & 3);
75  break;
76  default:
78  "Internal error, IDCT permutation not set\n");
79  }
80 }
81 
82 static void put_pixels_clamped_c(const int16_t *block, uint8_t *restrict pixels,
83  int line_size)
84 {
85  int i;
86 
87  /* read the pixels */
88  for (i = 0; i < 8; i++) {
89  pixels[0] = av_clip_uint8(block[0]);
90  pixels[1] = av_clip_uint8(block[1]);
91  pixels[2] = av_clip_uint8(block[2]);
92  pixels[3] = av_clip_uint8(block[3]);
93  pixels[4] = av_clip_uint8(block[4]);
94  pixels[5] = av_clip_uint8(block[5]);
95  pixels[6] = av_clip_uint8(block[6]);
96  pixels[7] = av_clip_uint8(block[7]);
97 
98  pixels += line_size;
99  block += 8;
100  }
101 }
102 
103 static void put_signed_pixels_clamped_c(const int16_t *block,
104  uint8_t *restrict pixels,
105  int line_size)
106 {
107  int i, j;
108 
109  for (i = 0; i < 8; i++) {
110  for (j = 0; j < 8; j++) {
111  if (*block < -128)
112  *pixels = 0;
113  else if (*block > 127)
114  *pixels = 255;
115  else
116  *pixels = (uint8_t) (*block + 128);
117  block++;
118  pixels++;
119  }
120  pixels += (line_size - 8);
121  }
122 }
123 
124 static void add_pixels_clamped_c(const int16_t *block, uint8_t *restrict pixels,
125  int line_size)
126 {
127  int i;
128 
129  /* read the pixels */
130  for (i = 0; i < 8; i++) {
131  pixels[0] = av_clip_uint8(pixels[0] + block[0]);
132  pixels[1] = av_clip_uint8(pixels[1] + block[1]);
133  pixels[2] = av_clip_uint8(pixels[2] + block[2]);
134  pixels[3] = av_clip_uint8(pixels[3] + block[3]);
135  pixels[4] = av_clip_uint8(pixels[4] + block[4]);
136  pixels[5] = av_clip_uint8(pixels[5] + block[5]);
137  pixels[6] = av_clip_uint8(pixels[6] + block[6]);
138  pixels[7] = av_clip_uint8(pixels[7] + block[7]);
139  pixels += line_size;
140  block += 8;
141  }
142 }
143 
144 static void jref_idct_put(uint8_t *dest, int line_size, int16_t *block)
145 {
146  ff_j_rev_dct(block);
147  put_pixels_clamped_c(block, dest, line_size);
148 }
149 
150 static void jref_idct_add(uint8_t *dest, int line_size, int16_t *block)
151 {
152  ff_j_rev_dct(block);
153  add_pixels_clamped_c(block, dest, line_size);
154 }
155 
157 {
158  const unsigned high_bit_depth = avctx->bits_per_raw_sample > 8;
159 
160  if (avctx->bits_per_raw_sample == 10) {
163  c->idct = ff_simple_idct_10;
165  } else if (avctx->idct_algo == FF_IDCT_INT) {
166  c->idct_put = jref_idct_put;
167  c->idct_add = jref_idct_add;
168  c->idct = ff_j_rev_dct;
170  } else if (avctx->idct_algo == FF_IDCT_FAAN) {
173  c->idct = ff_faanidct;
175  } else { // accurate/default
178  c->idct = ff_simple_idct_8;
180  }
181 
185 
186  if (ARCH_ARM)
187  ff_idctdsp_init_arm(c, avctx, high_bit_depth);
188  if (ARCH_PPC)
189  ff_idctdsp_init_ppc(c, avctx, high_bit_depth);
190  if (ARCH_X86)
191  ff_idctdsp_init_x86(c, avctx, high_bit_depth);
192 
194  c->perm_type);
195 }
void ff_idctdsp_init_x86(IDCTDSPContext *c, AVCodecContext *avctx, unsigned high_bit_depth)
Definition: idctdsp_init.c:61
int ff_init_scantable_permutation_x86(uint8_t *idct_permutation, enum idct_permutation_type perm_type)
Definition: idctdsp_init.c:42
idct_permutation_type
Definition: idctdsp.h:35
#define ARCH_ARM
Definition: config.h:14
void ff_simple_idct_add_10(uint8_t *dest, int line_size, int16_t *block)
Scantable.
Definition: idctdsp.h:29
#define ARCH_X86
Definition: config.h:33
void(* add_pixels_clamped)(const int16_t *block, uint8_t *pixels, int line_size)
Definition: idctdsp.h:59
uint8_t raster_end[64]
Definition: idctdsp.h:32
uint8_t permutated[64]
Definition: idctdsp.h:31
int bits_per_raw_sample
Bits per sample/pixel of internal libavcodec pixel/sample format.
Definition: avcodec.h:2508
Macro definitions for various function/variable attributes.
av_cold void ff_idctdsp_init_ppc(IDCTDSPContext *c, AVCodecContext *avctx, unsigned high_bit_depth)
Definition: idctdsp.c:230
static void add_pixels_clamped_c(const int16_t *block, uint8_t *restrict pixels, int line_size)
Definition: idctdsp.c:124
uint8_t
#define av_cold
Definition: attributes.h:66
#define FF_IDCT_INT
Definition: avcodec.h:2469
void ff_faanidct(int16_t block[64])
Definition: faanidct.c:132
static void put_pixels_clamped_c(const int16_t *block, uint8_t *restrict pixels, int line_size)
Definition: idctdsp.c:82
static void jref_idct_add(uint8_t *dest, int line_size, int16_t *block)
Definition: idctdsp.c:150
const uint8_t * scantable
Definition: idctdsp.h:30
void ff_simple_idct_put_10(uint8_t *dest, int line_size, int16_t *block)
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:123
void av_log(void *avcl, int level, const char *fmt,...)
Definition: log.c:168
void ff_faanidct_put(uint8_t *dest, int line_size, int16_t block[64])
Definition: faanidct.c:158
void(* put_pixels_clamped)(const int16_t *block, uint8_t *pixels, int line_size)
Definition: idctdsp.h:53
void(* put_signed_pixels_clamped)(const int16_t *block, uint8_t *pixels, int line_size)
Definition: idctdsp.h:56
av_cold void ff_init_scantable_permutation(uint8_t *idct_permutation, enum idct_permutation_type perm_type)
Definition: idctdsp.c:49
int idct_algo
IDCT algorithm, see FF_IDCT_* below.
Definition: avcodec.h:2467
uint8_t idct_permutation[64]
IDCT input permutation.
Definition: idctdsp.h:94
void(* idct_add)(uint8_t *dest, int line_size, int16_t *block)
block -> idct -> add dest -> clip to unsigned 8 bit -> dest.
Definition: idctdsp.h:77
void ff_simple_idct_10(int16_t *block)
void(* idct_put)(uint8_t *dest, int line_size, int16_t *block)
block -> idct -> clip to unsigned 8 bit -> dest.
Definition: idctdsp.h:70
NULL
Definition: eval.c:55
void ff_j_rev_dct(int16_t *data)
Libavcodec external API header.
main external API structure.
Definition: avcodec.h:1044
av_cold void ff_idctdsp_init_arm(IDCTDSPContext *c, AVCodecContext *avctx, unsigned high_bit_depth)
static void put_signed_pixels_clamped_c(const int16_t *block, uint8_t *restrict pixels, int line_size)
Definition: idctdsp.c:103
#define ARCH_PPC
Definition: config.h:24
void ff_simple_idct_add_8(uint8_t *dest, int line_size, int16_t *block)
common internal and external API header
#define restrict
Definition: config.h:8
#define FF_IDCT_FAAN
Definition: avcodec.h:2490
void ff_simple_idct_put_8(uint8_t *dest, int line_size, int16_t *block)
av_cold void ff_init_scantable(uint8_t *permutation, ScanTable *st, const uint8_t *src_scantable)
Definition: idctdsp.c:28
av_cold void ff_idctdsp_init(IDCTDSPContext *c, AVCodecContext *avctx)
Definition: idctdsp.c:156
simple idct header.
static void jref_idct_put(uint8_t *dest, int line_size, int16_t *block)
Definition: idctdsp.c:144
void ff_faanidct_add(uint8_t *dest, int line_size, int16_t block[64])
Definition: faanidct.c:145
void ff_simple_idct_8(int16_t *block)
enum idct_permutation_type perm_type
Definition: idctdsp.h:95
void(* idct)(int16_t *block)
Definition: idctdsp.h:63
static int16_t block[64]
Definition: dct-test.c:88