FFmpeg
mpegvideoencdsp.c
Go to the documentation of this file.
1 /*
2  * This file is part of FFmpeg.
3  *
4  * FFmpeg 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  * FFmpeg 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 FFmpeg; if not, write to the Free Software
16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17  */
18 
19 #include <assert.h>
20 #include <stdint.h>
21 #include <string.h>
22 
23 #include "config.h"
24 #include "libavutil/avassert.h"
25 #include "libavutil/attributes.h"
26 #include "libavutil/imgutils.h"
27 #include "avcodec.h"
28 #include "me_cmp.h"
29 #include "mpegvideoencdsp.h"
30 
31 static int try_8x8basis_c(int16_t rem[64], int16_t weight[64],
32  int16_t basis[64], int scale)
33 {
34  int i;
35  unsigned int sum = 0;
36 
37  for (i = 0; i < 8 * 8; i++) {
38  int b = rem[i] + ((basis[i] * scale +
39  (1 << (BASIS_SHIFT - RECON_SHIFT - 1))) >>
40  (BASIS_SHIFT - RECON_SHIFT));
41  int w = weight[i];
42  b >>= RECON_SHIFT;
43  av_assert2(-512 < b && b < 512);
44 
45  sum += (w * b) * (w * b) >> 4;
46  }
47  return sum >> 2;
48 }
49 
50 static void add_8x8basis_c(int16_t rem[64], int16_t basis[64], int scale)
51 {
52  int i;
53 
54  for (i = 0; i < 8 * 8; i++)
55  rem[i] += (basis[i] * scale +
56  (1 << (BASIS_SHIFT - RECON_SHIFT - 1))) >>
57  (BASIS_SHIFT - RECON_SHIFT);
58 }
59 
60 static int pix_sum_c(uint8_t *pix, int line_size)
61 {
62  int s = 0, i, j;
63 
64  for (i = 0; i < 16; i++) {
65  for (j = 0; j < 16; j += 8) {
66  s += pix[0];
67  s += pix[1];
68  s += pix[2];
69  s += pix[3];
70  s += pix[4];
71  s += pix[5];
72  s += pix[6];
73  s += pix[7];
74  pix += 8;
75  }
76  pix += line_size - 16;
77  }
78  return s;
79 }
80 
81 static int pix_norm1_c(uint8_t *pix, int line_size)
82 {
83  int s = 0, i, j;
84  const uint32_t *sq = ff_square_tab + 256;
85 
86  for (i = 0; i < 16; i++) {
87  for (j = 0; j < 16; j += 8) {
88 #if HAVE_FAST_64BIT
89  register uint64_t x = *(uint64_t *) pix;
90  s += sq[x & 0xff];
91  s += sq[(x >> 8) & 0xff];
92  s += sq[(x >> 16) & 0xff];
93  s += sq[(x >> 24) & 0xff];
94  s += sq[(x >> 32) & 0xff];
95  s += sq[(x >> 40) & 0xff];
96  s += sq[(x >> 48) & 0xff];
97  s += sq[(x >> 56) & 0xff];
98 #else
99  register uint32_t x = *(uint32_t *) pix;
100  s += sq[x & 0xff];
101  s += sq[(x >> 8) & 0xff];
102  s += sq[(x >> 16) & 0xff];
103  s += sq[(x >> 24) & 0xff];
104  x = *(uint32_t *) (pix + 4);
105  s += sq[x & 0xff];
106  s += sq[(x >> 8) & 0xff];
107  s += sq[(x >> 16) & 0xff];
108  s += sq[(x >> 24) & 0xff];
109 #endif
110  pix += 8;
111  }
112  pix += line_size - 16;
113  }
114  return s;
115 }
116 
117 /* draw the edges of width 'w' of an image of size width, height */
118 // FIXME: Check that this is OK for MPEG-4 interlaced.
119 static void draw_edges_8_c(uint8_t *buf, int wrap, int width, int height,
120  int w, int h, int sides)
121 {
122  uint8_t *ptr = buf, *last_line;
123  int i;
124 
125  /* left and right */
126  for (i = 0; i < height; i++) {
127  memset(ptr - w, ptr[0], w);
128  memset(ptr + width, ptr[width - 1], w);
129  ptr += wrap;
130  }
131 
132  /* top and bottom + corners */
133  buf -= w;
134  last_line = buf + (height - 1) * wrap;
135  if (sides & EDGE_TOP)
136  for (i = 0; i < h; i++)
137  // top
138  memcpy(buf - (i + 1) * wrap, buf, width + w + w);
139  if (sides & EDGE_BOTTOM)
140  for (i = 0; i < h; i++)
141  // bottom
142  memcpy(last_line + (i + 1) * wrap, last_line, width + w + w);
143 }
144 
145 /* 2x2 -> 1x1 */
146 static void shrink22(uint8_t *dst, int dst_wrap,
147  const uint8_t *src, int src_wrap,
148  int width, int height)
149 {
150  int w;
151  const uint8_t *s1, *s2;
152  uint8_t *d;
153 
154  for (; height > 0; height--) {
155  s1 = src;
156  s2 = s1 + src_wrap;
157  d = dst;
158  for (w = width; w >= 4; w -= 4) {
159  d[0] = (s1[0] + s1[1] + s2[0] + s2[1] + 2) >> 2;
160  d[1] = (s1[2] + s1[3] + s2[2] + s2[3] + 2) >> 2;
161  d[2] = (s1[4] + s1[5] + s2[4] + s2[5] + 2) >> 2;
162  d[3] = (s1[6] + s1[7] + s2[6] + s2[7] + 2) >> 2;
163  s1 += 8;
164  s2 += 8;
165  d += 4;
166  }
167  for (; w > 0; w--) {
168  d[0] = (s1[0] + s1[1] + s2[0] + s2[1] + 2) >> 2;
169  s1 += 2;
170  s2 += 2;
171  d++;
172  }
173  src += 2 * src_wrap;
174  dst += dst_wrap;
175  }
176 }
177 
178 /* 4x4 -> 1x1 */
179 static void shrink44(uint8_t *dst, int dst_wrap,
180  const uint8_t *src, int src_wrap,
181  int width, int height)
182 {
183  int w;
184  const uint8_t *s1, *s2, *s3, *s4;
185  uint8_t *d;
186 
187  for (; height > 0; height--) {
188  s1 = src;
189  s2 = s1 + src_wrap;
190  s3 = s2 + src_wrap;
191  s4 = s3 + src_wrap;
192  d = dst;
193  for (w = width; w > 0; w--) {
194  d[0] = (s1[0] + s1[1] + s1[2] + s1[3] +
195  s2[0] + s2[1] + s2[2] + s2[3] +
196  s3[0] + s3[1] + s3[2] + s3[3] +
197  s4[0] + s4[1] + s4[2] + s4[3] + 8) >> 4;
198  s1 += 4;
199  s2 += 4;
200  s3 += 4;
201  s4 += 4;
202  d++;
203  }
204  src += 4 * src_wrap;
205  dst += dst_wrap;
206  }
207 }
208 
209 /* 8x8 -> 1x1 */
210 static void shrink88(uint8_t *dst, int dst_wrap,
211  const uint8_t *src, int src_wrap,
212  int width, int height)
213 {
214  int w, i;
215 
216  for (; height > 0; height--) {
217  for(w = width;w > 0; w--) {
218  int tmp = 0;
219  for (i = 0; i < 8; i++) {
220  tmp += src[0] + src[1] + src[2] + src[3] +
221  src[4] + src[5] + src[6] + src[7];
222  src += src_wrap;
223  }
224  *(dst++) = (tmp + 32) >> 6;
225  src += 8 - 8 * src_wrap;
226  }
227  src += 8 * src_wrap - 8 * width;
228  dst += dst_wrap - width;
229  }
230 }
231 
232 av_cold void ff_mpegvideoencdsp_init(MpegvideoEncDSPContext *c,
233  AVCodecContext *avctx)
234 {
235  c->try_8x8basis = try_8x8basis_c;
236  c->add_8x8basis = add_8x8basis_c;
237 
238  c->shrink[0] = av_image_copy_plane;
239  c->shrink[1] = shrink22;
240  c->shrink[2] = shrink44;
241  c->shrink[3] = shrink88;
242 
243  c->pix_sum = pix_sum_c;
244  c->pix_norm1 = pix_norm1_c;
245 
246  c->draw_edges = draw_edges_8_c;
247 
248 #if ARCH_ARM
249  ff_mpegvideoencdsp_init_arm(c, avctx);
250 #elif ARCH_PPC
251  ff_mpegvideoencdsp_init_ppc(c, avctx);
252 #elif ARCH_X86
253  ff_mpegvideoencdsp_init_x86(c, avctx);
254 #elif ARCH_MIPS
255  ff_mpegvideoencdsp_init_mips(c, avctx);
256 #endif
257 }
draw_edges_8_c
static void draw_edges_8_c(uint8_t *buf, int wrap, int width, int height, int w, int h, int sides)
Definition: mpegvideoencdsp.c:119
EDGE_BOTTOM
#define EDGE_BOTTOM
Definition: mpegvideoencdsp.h:30
add_8x8basis_c
static void add_8x8basis_c(int16_t rem[64], int16_t basis[64], int scale)
Definition: mpegvideoencdsp.c:50
pix_sum_c
static int pix_sum_c(uint8_t *pix, int line_size)
Definition: mpegvideoencdsp.c:60
basis
static int16_t basis[64][64]
Definition: mpegvideo_enc.c:4097
tmp
static uint8_t tmp[11]
Definition: aes_ctr.c:28
w
uint8_t w
Definition: llviddspenc.c:38
b
#define b
Definition: input.c:34
shrink22
static void shrink22(uint8_t *dst, int dst_wrap, const uint8_t *src, int src_wrap, int width, int height)
Definition: mpegvideoencdsp.c:146
ff_mpegvideoencdsp_init_ppc
av_cold void ff_mpegvideoencdsp_init_ppc(MpegvideoEncDSPContext *c, AVCodecContext *avctx)
Definition: mpegvideoencdsp.c:151
ff_mpegvideoencdsp_init_x86
void ff_mpegvideoencdsp_init_x86(MpegvideoEncDSPContext *c, AVCodecContext *avctx)
Definition: mpegvideoencdsp_init.c:214
av_image_copy_plane
void av_image_copy_plane(uint8_t *dst, int dst_linesize, const uint8_t *src, int src_linesize, int bytewidth, int height)
Copy image plane from src to dst.
Definition: imgutils.c:374
ff_mpegvideoencdsp_init
av_cold void ff_mpegvideoencdsp_init(MpegvideoEncDSPContext *c, AVCodecContext *avctx)
Definition: mpegvideoencdsp.c:232
s3
#define s3
Definition: regdef.h:40
ff_mpegvideoencdsp_init_mips
av_cold void ff_mpegvideoencdsp_init_mips(MpegvideoEncDSPContext *c, AVCodecContext *avctx)
Definition: mpegvideoencdsp_init_mips.c:26
wrap
#define wrap(func)
Definition: neontest.h:65
scale
static av_always_inline float scale(float x, float s)
Definition: vf_v360.c:1389
pix_norm1_c
static int pix_norm1_c(uint8_t *pix, int line_size)
Definition: mpegvideoencdsp.c:81
avassert.h
av_cold
#define av_cold
Definition: attributes.h:90
width
#define width
s
#define s(width, name)
Definition: cbs_vp9.c:256
BASIS_SHIFT
#define BASIS_SHIFT
Definition: mpegvideoencdsp.h:26
s1
#define s1
Definition: regdef.h:38
c
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
weight
static int weight(int i, int blen, int offset)
Definition: diracdec.c:1562
s2
#define s2
Definition: regdef.h:39
RECON_SHIFT
#define RECON_SHIFT
Definition: mpegvideoencdsp.h:27
height
#define height
attributes.h
MpegvideoEncDSPContext
Definition: mpegvideoencdsp.h:32
av_assert2
#define av_assert2(cond)
assert() equivalent, that does lie in speed critical code.
Definition: avassert.h:64
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
ff_square_tab
const uint32_t ff_square_tab[512]
Definition: me_cmp.c:35
s4
#define s4
Definition: regdef.h:41
avcodec.h
shrink88
static void shrink88(uint8_t *dst, int dst_wrap, const uint8_t *src, int src_wrap, int width, int height)
Definition: mpegvideoencdsp.c:210
try_8x8basis_c
static int try_8x8basis_c(int16_t rem[64], int16_t weight[64], int16_t basis[64], int scale)
Definition: mpegvideoencdsp.c:31
me_cmp.h
AVCodecContext
main external API structure.
Definition: avcodec.h:389
EDGE_TOP
#define EDGE_TOP
Definition: mpegvideoencdsp.h:29
ff_mpegvideoencdsp_init_arm
av_cold void ff_mpegvideoencdsp_init_arm(MpegvideoEncDSPContext *c, AVCodecContext *avctx)
Definition: mpegvideoencdsp_init_arm.c:30
mpegvideoencdsp.h
src
INIT_CLIP pixel * src
Definition: h264pred_template.c:418
shrink44
static void shrink44(uint8_t *dst, int dst_wrap, const uint8_t *src, int src_wrap, int width, int height)
Definition: mpegvideoencdsp.c:179
d
d
Definition: ffmpeg_filter.c:153
imgutils.h
h
h
Definition: vp9dsp_template.c:2038
Generated on Wed Aug 24 2022 21:41:42 for FFmpeg by   doxygen 1.8.17