FFmpeg
vc2enc_dwt.c
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1 /*
2  * Copyright (C) 2007 Marco Gerards <marco@gnu.org>
3  * Copyright (C) 2016 Open Broadcast Systems Ltd.
4  * Author 2016 Rostislav Pehlivanov <atomnuker@gmail.com>
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 #include "libavutil/attributes.h"
24 #include "libavutil/mem.h"
25 #include "vc2enc_dwt.h"
26 
27 /* Since the transforms spit out interleaved coefficients, this function
28  * rearranges the coefficients into the more traditional subdivision,
29  * making it easier to encode and perform another level. */
30 static av_always_inline void deinterleave(dwtcoef *linell, ptrdiff_t stride,
31  int width, int height, dwtcoef *synthl)
32 {
33  int x, y;
34  ptrdiff_t synthw = width << 1;
35  dwtcoef *linehl = linell + width;
36  dwtcoef *linelh = linell + height*stride;
37  dwtcoef *linehh = linelh + width;
38 
39  /* Deinterleave the coefficients. */
40  for (y = 0; y < height; y++) {
41  for (x = 0; x < width; x++) {
42  linell[x] = synthl[(x << 1)];
43  linehl[x] = synthl[(x << 1) + 1];
44  linelh[x] = synthl[(x << 1) + synthw];
45  linehh[x] = synthl[(x << 1) + synthw + 1];
46  }
47  synthl += synthw << 1;
48  linell += stride;
49  linelh += stride;
50  linehl += stride;
51  linehh += stride;
52  }
53 }
54 
56  ptrdiff_t stride, int width, int height)
57 {
58  int x, y;
59  dwtcoef *datal = data, *synth = t->buffer, *synthl = synth;
60  const ptrdiff_t synth_width = width << 1;
61  const ptrdiff_t synth_height = height << 1;
62 
63  /*
64  * Shift in one bit that is used for additional precision and copy
65  * the data to the buffer.
66  */
67  for (y = 0; y < synth_height; y++) {
68  for (x = 0; x < synth_width; x++)
69  synthl[x] = datal[x] << 1;
70  synthl += synth_width;
71  datal += stride;
72  }
73 
74  /* Horizontal synthesis. */
75  synthl = synth;
76  for (y = 0; y < synth_height; y++) {
77  /* Lifting stage 2. */
78  synthl[1] -= (8*synthl[0] + 9*synthl[2] - synthl[4] + 8) >> 4;
79  for (x = 1; x < width - 2; x++)
80  synthl[2*x + 1] -= (9*synthl[2*x] + 9*synthl[2*x + 2] - synthl[2*x + 4] -
81  synthl[2 * x - 2] + 8) >> 4;
82  synthl[synth_width - 1] -= (17*synthl[synth_width - 2] -
83  synthl[synth_width - 4] + 8) >> 4;
84  synthl[synth_width - 3] -= (8*synthl[synth_width - 2] +
85  9*synthl[synth_width - 4] -
86  synthl[synth_width - 6] + 8) >> 4;
87  /* Lifting stage 1. */
88  synthl[0] += (synthl[1] + synthl[1] + 2) >> 2;
89  for (x = 1; x < width - 1; x++)
90  synthl[2*x] += (synthl[2*x - 1] + synthl[2*x + 1] + 2) >> 2;
91 
92  synthl[synth_width - 2] += (synthl[synth_width - 3] +
93  synthl[synth_width - 1] + 2) >> 2;
94  synthl += synth_width;
95  }
96 
97  /* Vertical synthesis: Lifting stage 2. */
98  synthl = synth + synth_width;
99  for (x = 0; x < synth_width; x++)
100  synthl[x] -= (8*synthl[x - synth_width] + 9*synthl[x + synth_width] -
101  synthl[x + 3 * synth_width] + 8) >> 4;
102 
103  synthl = synth + (synth_width << 1);
104  for (y = 1; y < height - 2; y++) {
105  for (x = 0; x < synth_width; x++)
106  synthl[x + synth_width] -= (9*synthl[x] +
107  9*synthl[x + 2 * synth_width] -
108  synthl[x - 2 * synth_width] -
109  synthl[x + 4 * synth_width] + 8) >> 4;
110  synthl += synth_width << 1;
111  }
112 
113  synthl = synth + (synth_height - 1) * synth_width;
114  for (x = 0; x < synth_width; x++) {
115  synthl[x] -= (17*synthl[x - synth_width] -
116  synthl[x - 3*synth_width] + 8) >> 4;
117  synthl[x - 2*synth_width] -= (9*synthl[x - 3*synth_width] +
118  8*synthl[x - 1*synth_width] - synthl[x - 5*synth_width] + 8) >> 4;
119  }
120 
121  /* Vertical synthesis: Lifting stage 1. */
122  synthl = synth;
123  for (x = 0; x < synth_width; x++)
124  synthl[x] += (synthl[x + synth_width] + synthl[x + synth_width] + 2) >> 2;
125 
126  synthl = synth + (synth_width << 1);
127  for (y = 1; y < height - 1; y++) {
128  for (x = 0; x < synth_width; x++)
129  synthl[x] += (synthl[x - synth_width] + synthl[x + synth_width] + 2) >> 2;
130  synthl += synth_width << 1;
131  }
132 
133  synthl = synth + (synth_height - 2) * synth_width;
134  for (x = 0; x < synth_width; x++)
135  synthl[x] += (synthl[x - synth_width] + synthl[x + synth_width] + 2) >> 2;
136 
137  deinterleave(data, stride, width, height, synth);
138 }
139 
141  ptrdiff_t stride, int width, int height)
142 {
143  int x, y;
144  dwtcoef *synth = t->buffer, *synthl = synth, *datal = data;
145  const ptrdiff_t synth_width = width << 1;
146  const ptrdiff_t synth_height = height << 1;
147 
148  /*
149  * Shift in one bit that is used for additional precision and copy
150  * the data to the buffer.
151  */
152  for (y = 0; y < synth_height; y++) {
153  for (x = 0; x < synth_width; x++)
154  synthl[x] = datal[x] << 1;
155  synthl += synth_width;
156  datal += stride;
157  }
158 
159  /* Horizontal synthesis. */
160  synthl = synth;
161  for (y = 0; y < synth_height; y++) {
162  /* Lifting stage 2. */
163  for (x = 0; x < width - 1; x++)
164  synthl[2 * x + 1] -= (synthl[2 * x] + synthl[2 * x + 2] + 1) >> 1;
165 
166  synthl[synth_width - 1] -= (2*synthl[synth_width - 2] + 1) >> 1;
167 
168  /* Lifting stage 1. */
169  synthl[0] += (2*synthl[1] + 2) >> 2;
170  for (x = 1; x < width - 1; x++)
171  synthl[2 * x] += (synthl[2 * x - 1] + synthl[2 * x + 1] + 2) >> 2;
172 
173  synthl[synth_width - 2] += (synthl[synth_width - 3] + synthl[synth_width - 1] + 2) >> 2;
174 
175  synthl += synth_width;
176  }
177 
178  /* Vertical synthesis: Lifting stage 2. */
179  synthl = synth + synth_width;
180  for (x = 0; x < synth_width; x++)
181  synthl[x] -= (synthl[x - synth_width] + synthl[x + synth_width] + 1) >> 1;
182 
183  synthl = synth + (synth_width << 1);
184  for (y = 1; y < height - 1; y++) {
185  for (x = 0; x < synth_width; x++)
186  synthl[x + synth_width] -= (synthl[x] + synthl[x + synth_width * 2] + 1) >> 1;
187  synthl += (synth_width << 1);
188  }
189 
190  synthl = synth + (synth_height - 1) * synth_width;
191  for (x = 0; x < synth_width; x++)
192  synthl[x] -= (2*synthl[x - synth_width] + 1) >> 1;
193 
194  /* Vertical synthesis: Lifting stage 1. */
195  synthl = synth;
196  for (x = 0; x < synth_width; x++)
197  synthl[x] += (2*synthl[synth_width + x] + 2) >> 2;
198 
199  synthl = synth + (synth_width << 1);
200  for (y = 1; y < height - 1; y++) {
201  for (x = 0; x < synth_width; x++)
202  synthl[x] += (synthl[x + synth_width] + synthl[x - synth_width] + 2) >> 2;
203  synthl += (synth_width << 1);
204  }
205 
206  synthl = synth + (synth_height - 2)*synth_width;
207  for (x = 0; x < synth_width; x++)
208  synthl[x] += (synthl[x - synth_width] + synthl[x + synth_width] + 2) >> 2;
209 
210 
211  deinterleave(data, stride, width, height, synth);
212 }
213 
215  ptrdiff_t stride, int width, int height,
216  const int s)
217 {
218  int x, y;
219  dwtcoef *synth = t->buffer, *synthl = synth, *datal = data;
220  const ptrdiff_t synth_width = width << 1;
221  const ptrdiff_t synth_height = height << 1;
222 
223  /* Horizontal synthesis. */
224  for (y = 0; y < synth_height; y++) {
225  for (x = 0; x < synth_width; x += 2) {
226  synthl[y*synth_width + x + 1] = (datal[y*stride + x + 1] << s) -
227  (datal[y*stride + x] << s);
228  synthl[y*synth_width + x] = (datal[y*stride + x + 0] << s) +
229  ((synthl[y*synth_width + x + 1] + 1) >> 1);
230  }
231  }
232 
233  /* Vertical synthesis. */
234  for (x = 0; x < synth_width; x++) {
235  for (y = 0; y < synth_height; y += 2) {
236  synthl[(y + 1)*synth_width + x] = synthl[(y + 1)*synth_width + x] -
237  synthl[y*synth_width + x];
238  synthl[y*synth_width + x] = synthl[y*synth_width + x] +
239  ((synthl[(y + 1)*synth_width + x] + 1) >> 1);
240  }
241  }
242 
243  deinterleave(data, stride, width, height, synth);
244 }
245 
247  ptrdiff_t stride, int width, int height)
248 {
249  dwt_haar(t, data, stride, width, height, 0);
250 }
251 
253  ptrdiff_t stride, int width, int height)
254 {
255  dwt_haar(t, data, stride, width, height, 1);
256 }
257 
259  int p_height, int slice_w, int slice_h)
260 {
265 
266  /* Pad by the slice size, only matters for non-Haar wavelets */
267  s->buffer = av_calloc((p_stride + slice_w)*(p_height + slice_h), sizeof(dwtcoef));
268  if (!s->buffer)
269  return 1;
270 
271  s->padding = (slice_h >> 1)*p_stride + (slice_w >> 1);
272  s->buffer += s->padding;
273 
274  return 0;
275 }
276 
278 {
279  av_free(s->buffer - s->padding);
280  s->buffer = NULL;
281 }
#define NULL
Definition: coverity.c:32
av_cold void ff_vc2enc_free_transforms(VC2TransformContext *s)
Definition: vc2enc_dwt.c:277
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:100
Memory handling functions.
Macro definitions for various function/variable attributes.
void * av_calloc(size_t nmemb, size_t size)
Non-inlined equivalent of av_mallocz_array().
Definition: mem.c:244
#define av_cold
Definition: attributes.h:82
#define height
static av_always_inline void dwt_haar(VC2TransformContext *t, dwtcoef *data, ptrdiff_t stride, int width, int height, const int s)
Definition: vc2enc_dwt.c:214
av_cold int ff_vc2enc_init_transforms(VC2TransformContext *s, int p_stride, int p_height, int slice_w, int slice_h)
Definition: vc2enc_dwt.c:258
static av_always_inline void deinterleave(dwtcoef *linell, ptrdiff_t stride, int width, int height, dwtcoef *synthl)
Definition: vc2enc_dwt.c:30
#define width
#define s(width, name)
Definition: cbs_vp9.c:257
static void vc2_subband_dwt_97(VC2TransformContext *t, dwtcoef *data, ptrdiff_t stride, int width, int height)
Definition: vc2enc_dwt.c:55
void(* vc2_subband_dwt[VC2_TRANSFORMS_NB])(struct VC2TransformContext *t, dwtcoef *data, ptrdiff_t stride, int width, int height)
Definition: vc2enc_dwt.h:45
static void vc2_subband_dwt_haar_shift(VC2TransformContext *t, dwtcoef *data, ptrdiff_t stride, int width, int height)
Definition: vc2enc_dwt.c:252
dwtcoef * buffer
Definition: vc2enc_dwt.h:43
GLint GLenum GLboolean GLsizei stride
Definition: opengl_enc.c:104
int32_t dwtcoef
Definition: vc2enc_dwt.h:28
#define av_free(p)
static void vc2_subband_dwt_haar(VC2TransformContext *t, dwtcoef *data, ptrdiff_t stride, int width, int height)
Definition: vc2enc_dwt.c:246
#define av_always_inline
Definition: attributes.h:39
#define stride
static void vc2_subband_dwt_53(VC2TransformContext *t, dwtcoef *data, ptrdiff_t stride, int width, int height)
Definition: vc2enc_dwt.c:140