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 void (*ff_put_pixels_clamped)(const int16_t *block, uint8_t *pixels, int line_size);
83 void (*ff_add_pixels_clamped)(const int16_t *block, uint8_t *pixels, int line_size);
84 
85 static void put_pixels_clamped_c(const int16_t *block, uint8_t *restrict pixels,
86  int line_size)
87 {
88  int i;
89 
90  /* read the pixels */
91  for (i = 0; i < 8; i++) {
92  pixels[0] = av_clip_uint8(block[0]);
93  pixels[1] = av_clip_uint8(block[1]);
94  pixels[2] = av_clip_uint8(block[2]);
95  pixels[3] = av_clip_uint8(block[3]);
96  pixels[4] = av_clip_uint8(block[4]);
97  pixels[5] = av_clip_uint8(block[5]);
98  pixels[6] = av_clip_uint8(block[6]);
99  pixels[7] = av_clip_uint8(block[7]);
100 
101  pixels += line_size;
102  block += 8;
103  }
104 }
105 
106 static void put_signed_pixels_clamped_c(const int16_t *block,
107  uint8_t *restrict pixels,
108  int line_size)
109 {
110  int i, j;
111 
112  for (i = 0; i < 8; i++) {
113  for (j = 0; j < 8; j++) {
114  if (*block < -128)
115  *pixels = 0;
116  else if (*block > 127)
117  *pixels = 255;
118  else
119  *pixels = (uint8_t) (*block + 128);
120  block++;
121  pixels++;
122  }
123  pixels += (line_size - 8);
124  }
125 }
126 
127 static void add_pixels_clamped_c(const int16_t *block, uint8_t *restrict pixels,
128  int line_size)
129 {
130  int i;
131 
132  /* read the pixels */
133  for (i = 0; i < 8; i++) {
134  pixels[0] = av_clip_uint8(pixels[0] + block[0]);
135  pixels[1] = av_clip_uint8(pixels[1] + block[1]);
136  pixels[2] = av_clip_uint8(pixels[2] + block[2]);
137  pixels[3] = av_clip_uint8(pixels[3] + block[3]);
138  pixels[4] = av_clip_uint8(pixels[4] + block[4]);
139  pixels[5] = av_clip_uint8(pixels[5] + block[5]);
140  pixels[6] = av_clip_uint8(pixels[6] + block[6]);
141  pixels[7] = av_clip_uint8(pixels[7] + block[7]);
142  pixels += line_size;
143  block += 8;
144  }
145 }
146 
148 {
149  const unsigned high_bit_depth = avctx->bits_per_raw_sample > 8;
150 
151  if (avctx->bits_per_raw_sample == 10) {
154  c->idct = ff_simple_idct_10;
156  } else if (avctx->idct_algo == FF_IDCT_INT) {
159  c->idct = ff_j_rev_dct;
161 #if CONFIG_FAANIDCT
162  } else if (avctx->idct_algo == FF_IDCT_FAAN) {
165  c->idct = ff_faanidct;
167 #endif /* CONFIG_FAANIDCT */
168  } else { // accurate/default
171  c->idct = ff_simple_idct_8;
173  }
174 
178 
181 
182  if (ARCH_ARM)
183  ff_idctdsp_init_arm(c, avctx, high_bit_depth);
184  if (ARCH_PPC)
185  ff_idctdsp_init_ppc(c, avctx, high_bit_depth);
186  if (ARCH_X86)
187  ff_idctdsp_init_x86(c, avctx, high_bit_depth);
188 
190  c->perm_type);
191 }
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
void(* ff_add_pixels_clamped)(const int16_t *block, uint8_t *pixels, int line_size)
Definition: idctdsp.c:83
#define ARCH_PPC
Definition: config.h:24
void ff_simple_idct_add_10(uint8_t *dest, int line_size, int16_t *block)
Scantable.
Definition: idctdsp.h:29
av_log(ac->avr, AV_LOG_TRACE, "%d samples - audio_convert: %s to %s (%s)\, len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt), use_generic ? ac->func_descr_generic :ac->func_descr)
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
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
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:2776
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 int16_t block[64]
Definition: dct.c:97
static void add_pixels_clamped_c(const int16_t *block, uint8_t *restrict pixels, int line_size)
Definition: idctdsp.c:127
uint8_t
#define av_cold
Definition: attributes.h:66
#define FF_IDCT_INT
Definition: avcodec.h:2737
void ff_faanidct(int16_t block[64])
Definition: faanidct.c:125
static void put_pixels_clamped_c(const int16_t *block, uint8_t *restrict pixels, int line_size)
Definition: idctdsp.c:85
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:124
#define ARCH_X86
Definition: config.h:33
void ff_jref_idct_add(uint8_t *dest, int line_size, int16_t *block)
Definition: jrevdct.c:952
void ff_faanidct_put(uint8_t *dest, int line_size, int16_t block[64])
Definition: faanidct.c:151
void(* idct_put)(uint8_t *dest, int line_size, int16_t *block)
block -> idct -> clip to unsigned 8 bit -> dest.
Definition: idctdsp.h:70
av_cold void ff_init_scantable_permutation(uint8_t *idct_permutation, enum idct_permutation_type perm_type)
Definition: idctdsp.c:49
#define ARCH_ARM
Definition: config.h:14
int idct_algo
IDCT algorithm, see FF_IDCT_* below.
Definition: avcodec.h:2735
uint8_t idct_permutation[64]
IDCT input permutation.
Definition: idctdsp.h:94
void ff_simple_idct_10(int16_t *block)
NULL
Definition: eval.c:55
void ff_j_rev_dct(int16_t *data)
Libavcodec external API header.
void ff_jref_idct_put(uint8_t *dest, int line_size, int16_t *block)
Definition: jrevdct.c:946
main external API structure.
Definition: avcodec.h:1409
static void(WINAPI *cond_broadcast)(pthread_cond_t *cond)
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:106
void(* put_pixels_clamped)(const int16_t *block, uint8_t *pixels, int line_size)
Definition: idctdsp.h:53
void ff_simple_idct_add_8(uint8_t *dest, int line_size, int16_t *block)
common internal and external API header
#define FF_IDCT_FAAN
Definition: avcodec.h:2758
void ff_simple_idct_put_8(uint8_t *dest, int line_size, int16_t *block)
void(* ff_put_pixels_clamped)(const int16_t *block, uint8_t *pixels, int line_size)
Definition: idctdsp.c:82
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:147
simple idct header.
void ff_faanidct_add(uint8_t *dest, int line_size, int16_t block[64])
Definition: faanidct.c:138
void(* put_signed_pixels_clamped)(const int16_t *block, uint8_t *pixels, int line_size)
Definition: idctdsp.h:56
#define restrict
Definition: config.h:8
void(* idct)(int16_t *block)
Definition: idctdsp.h:63
void ff_simple_idct_8(int16_t *block)
enum idct_permutation_type perm_type
Definition: idctdsp.h:95