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vf_pp7.c
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1 /*
2  * Copyright (c) 2005 Michael Niedermayer <michaelni@gmx.at>
3  * Copyright (c) 2014 Arwa Arif <arwaarif1994@gmail.com>
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License as published by
9  * the Free Software Foundation; either version 2 of the License, or
10  * (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15  * GNU General Public License for more details.
16  *
17  * You should have received a copy of the GNU General Public License along
18  * with FFmpeg; if not, write to the Free Software Foundation, Inc.,
19  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
20  */
21 
22 /**
23  * @file
24  * Postprocessing filter - 7
25  *
26  * Originally written by Michael Niedermayer for the MPlayer
27  * project, and ported by Arwa Arif for FFmpeg.
28  */
29 
30 #include "libavutil/avassert.h"
31 #include "libavutil/imgutils.h"
32 #include "libavutil/opt.h"
33 #include "libavutil/pixdesc.h"
34 #include "internal.h"
35 #include "vf_pp7.h"
36 
37 enum mode {
38  MODE_HARD,
39  MODE_SOFT,
40  MODE_MEDIUM
41 };
42 
43 #define OFFSET(x) offsetof(PP7Context, x)
44 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
45 static const AVOption pp7_options[] = {
46  { "qp", "force a constant quantizer parameter", OFFSET(qp), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 64, FLAGS },
47  { "mode", "set thresholding mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64 = MODE_MEDIUM}, 0, 2, FLAGS, "mode" },
48  { "hard", "hard thresholding", 0, AV_OPT_TYPE_CONST, {.i64 = MODE_HARD}, INT_MIN, INT_MAX, FLAGS, "mode" },
49  { "soft", "soft thresholding", 0, AV_OPT_TYPE_CONST, {.i64 = MODE_SOFT}, INT_MIN, INT_MAX, FLAGS, "mode" },
50  { "medium", "medium thresholding", 0, AV_OPT_TYPE_CONST, {.i64 = MODE_MEDIUM}, INT_MIN, INT_MAX, FLAGS, "mode" },
51  { NULL }
52 };
53 
54 AVFILTER_DEFINE_CLASS(pp7);
55 
56 DECLARE_ALIGNED(8, static const uint8_t, dither)[8][8] = {
57  { 0, 48, 12, 60, 3, 51, 15, 63, },
58  { 32, 16, 44, 28, 35, 19, 47, 31, },
59  { 8, 56, 4, 52, 11, 59, 7, 55, },
60  { 40, 24, 36, 20, 43, 27, 39, 23, },
61  { 2, 50, 14, 62, 1, 49, 13, 61, },
62  { 34, 18, 46, 30, 33, 17, 45, 29, },
63  { 10, 58, 6, 54, 9, 57, 5, 53, },
64  { 42, 26, 38, 22, 41, 25, 37, 21, },
65 };
66 
67 #define N0 4
68 #define N1 5
69 #define N2 10
70 #define SN0 2
71 #define SN1 2.2360679775
72 #define SN2 3.16227766017
73 #define N (1 << 16)
74 
75 static const int factor[16] = {
76  N / (N0 * N0), N / (N0 * N1), N / (N0 * N0), N / (N0 * N2),
77  N / (N1 * N0), N / (N1 * N1), N / (N1 * N0), N / (N1 * N2),
78  N / (N0 * N0), N / (N0 * N1), N / (N0 * N0), N / (N0 * N2),
79  N / (N2 * N0), N / (N2 * N1), N / (N2 * N0), N / (N2 * N2),
80 };
81 
82 static const int thres[16] = {
83  N / (SN0 * SN0), N / (SN0 * SN2), N / (SN0 * SN0), N / (SN0 * SN2),
84  N / (SN2 * SN0), N / (SN2 * SN2), N / (SN2 * SN0), N / (SN2 * SN2),
85  N / (SN0 * SN0), N / (SN0 * SN2), N / (SN0 * SN0), N / (SN0 * SN2),
86  N / (SN2 * SN0), N / (SN2 * SN2), N / (SN2 * SN0), N / (SN2 * SN2),
87 };
88 
89 static void init_thres2(PP7Context *p)
90 {
91  int qp, i;
92  int bias = 0; //FIXME
93 
94  for (qp = 0; qp < 99; qp++) {
95  for (i = 0; i < 16; i++) {
96  p->thres2[qp][i] = ((i&1) ? SN2 : SN0) * ((i&4) ? SN2 : SN0) * FFMAX(1, qp) * (1<<2) - 1 - bias;
97  }
98  }
99 }
100 
101 static inline void dctA_c(int16_t *dst, uint8_t *src, int stride)
102 {
103  int i;
104 
105  for (i = 0; i < 4; i++) {
106  int s0 = src[0 * stride] + src[6 * stride];
107  int s1 = src[1 * stride] + src[5 * stride];
108  int s2 = src[2 * stride] + src[4 * stride];
109  int s3 = src[3 * stride];
110  int s = s3 + s3;
111  s3 = s - s0;
112  s0 = s + s0;
113  s = s2 + s1;
114  s2 = s2 - s1;
115  dst[0] = s0 + s;
116  dst[2] = s0 - s;
117  dst[1] = 2 * s3 + s2;
118  dst[3] = s3 - 2 * s2;
119  src++;
120  dst += 4;
121  }
122 }
123 
124 static void dctB_c(int16_t *dst, int16_t *src)
125 {
126  int i;
127 
128  for (i = 0; i < 4; i++) {
129  int s0 = src[0 * 4] + src[6 * 4];
130  int s1 = src[1 * 4] + src[5 * 4];
131  int s2 = src[2 * 4] + src[4 * 4];
132  int s3 = src[3 * 4];
133  int s = s3 + s3;
134  s3 = s - s0;
135  s0 = s + s0;
136  s = s2 + s1;
137  s2 = s2 - s1;
138  dst[0 * 4] = s0 + s;
139  dst[2 * 4] = s0 - s;
140  dst[1 * 4] = 2 * s3 + s2;
141  dst[3 * 4] = s3 - 2 * s2;
142  src++;
143  dst++;
144  }
145 }
146 
147 static int hardthresh_c(PP7Context *p, int16_t *src, int qp)
148 {
149  int i;
150  int a;
151 
152  a = src[0] * factor[0];
153  for (i = 1; i < 16; i++) {
154  unsigned int threshold1 = p->thres2[qp][i];
155  unsigned int threshold2 = threshold1 << 1;
156  int level = src[i];
157  if (((unsigned)(level + threshold1)) > threshold2)
158  a += level * factor[i];
159  }
160  return (a + (1 << 11)) >> 12;
161 }
162 
163 static int mediumthresh_c(PP7Context *p, int16_t *src, int qp)
164 {
165  int i;
166  int a;
167 
168  a = src[0] * factor[0];
169  for (i = 1; i < 16; i++) {
170  unsigned int threshold1 = p->thres2[qp][i];
171  unsigned int threshold2 = threshold1 << 1;
172  int level = src[i];
173  if (((unsigned)(level + threshold1)) > threshold2) {
174  if (((unsigned)(level + 2 * threshold1)) > 2 * threshold2)
175  a += level * factor[i];
176  else {
177  if (level > 0)
178  a += 2 * (level - (int)threshold1) * factor[i];
179  else
180  a += 2 * (level + (int)threshold1) * factor[i];
181  }
182  }
183  }
184  return (a + (1 << 11)) >> 12;
185 }
186 
187 static int softthresh_c(PP7Context *p, int16_t *src, int qp)
188 {
189  int i;
190  int a;
191 
192  a = src[0] * factor[0];
193  for (i = 1; i < 16; i++) {
194  unsigned int threshold1 = p->thres2[qp][i];
195  unsigned int threshold2 = threshold1 << 1;
196  int level = src[i];
197  if (((unsigned)(level + threshold1)) > threshold2) {
198  if (level > 0)
199  a += (level - (int)threshold1) * factor[i];
200  else
201  a += (level + (int)threshold1) * factor[i];
202  }
203  }
204  return (a + (1 << 11)) >> 12;
205 }
206 
207 static void filter(PP7Context *p, uint8_t *dst, uint8_t *src,
208  int dst_stride, int src_stride,
209  int width, int height,
210  uint8_t *qp_store, int qp_stride, int is_luma)
211 {
212  int x, y;
213  const int stride = is_luma ? p->temp_stride : ((width + 16 + 15) & (~15));
214  uint8_t *p_src = p->src + 8 * stride;
215  int16_t *block = (int16_t *)p->src;
216  int16_t *temp = (int16_t *)(p->src + 32);
217 
218  if (!src || !dst) return;
219  for (y = 0; y < height; y++) {
220  int index = 8 + 8 * stride + y * stride;
221  memcpy(p_src + index, src + y * src_stride, width);
222  for (x = 0; x < 8; x++) {
223  p_src[index - x - 1]= p_src[index + x ];
224  p_src[index + width + x ]= p_src[index + width - x - 1];
225  }
226  }
227  for (y = 0; y < 8; y++) {
228  memcpy(p_src + ( 7 - y ) * stride, p_src + ( y + 8 ) * stride, stride);
229  memcpy(p_src + (height + 8 + y) * stride, p_src + (height - y + 7) * stride, stride);
230  }
231  //FIXME (try edge emu)
232 
233  for (y = 0; y < height; y++) {
234  for (x = -8; x < 0; x += 4) {
235  const int index = x + y * stride + (8 - 3) * (1 + stride) + 8; //FIXME silly offset
236  uint8_t *src = p_src + index;
237  int16_t *tp = temp + 4 * x;
238 
239  dctA_c(tp + 4 * 8, src, stride);
240  }
241  for (x = 0; x < width; ) {
242  const int qps = 3 + is_luma;
243  int qp;
244  int end = FFMIN(x + 8, width);
245 
246  if (p->qp)
247  qp = p->qp;
248  else {
249  qp = qp_store[ (FFMIN(x, width - 1) >> qps) + (FFMIN(y, height - 1) >> qps) * qp_stride];
250  qp = ff_norm_qscale(qp, p->qscale_type);
251  }
252  for (; x < end; x++) {
253  const int index = x + y * stride + (8 - 3) * (1 + stride) + 8; //FIXME silly offset
254  uint8_t *src = p_src + index;
255  int16_t *tp = temp + 4 * x;
256  int v;
257 
258  if ((x & 3) == 0)
259  dctA_c(tp + 4 * 8, src, stride);
260 
261  p->dctB(block, tp);
262 
263  v = p->requantize(p, block, qp);
264  v = (v + dither[y & 7][x & 7]) >> 6;
265  if ((unsigned)v > 255)
266  v = (-v) >> 31;
267  dst[x + y * dst_stride] = v;
268  }
269  }
270  }
271 }
272 
273 static int query_formats(AVFilterContext *ctx)
274 {
275  static const enum PixelFormat pix_fmts[] = {
276  AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P,
277  AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV411P,
278  AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV440P,
279  AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ422P,
280  AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ440P,
281  AV_PIX_FMT_GBRP,
282  AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE
283  };
284  ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
285  return 0;
286 }
287 
288 static int config_input(AVFilterLink *inlink)
289 {
290  AVFilterContext *ctx = inlink->dst;
291  PP7Context *pp7 = ctx->priv;
292  const int h = FFALIGN(inlink->h + 16, 16);
293  const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
294 
295  pp7->hsub = desc->log2_chroma_w;
296  pp7->vsub = desc->log2_chroma_h;
297 
298  pp7->temp_stride = FFALIGN(inlink->w + 16, 16);
299  pp7->src = av_malloc_array(pp7->temp_stride, (h + 8) * sizeof(uint8_t));
300 
301  if (!pp7->src)
302  return AVERROR(ENOMEM);
303 
304  init_thres2(pp7);
305 
306  switch (pp7->mode) {
307  case 0: pp7->requantize = hardthresh_c; break;
308  case 1: pp7->requantize = softthresh_c; break;
309  default:
310  case 2: pp7->requantize = mediumthresh_c; break;
311  }
312 
313  pp7->dctB = dctB_c;
314 
315  if (ARCH_X86)
316  ff_pp7_init_x86(pp7);
317 
318  return 0;
319 }
320 
321 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
322 {
323  AVFilterContext *ctx = inlink->dst;
324  PP7Context *pp7 = ctx->priv;
325  AVFilterLink *outlink = ctx->outputs[0];
326  AVFrame *out = in;
327 
328  int qp_stride = 0;
329  uint8_t *qp_table = NULL;
330 
331  if (!pp7->qp)
332  qp_table = av_frame_get_qp_table(in, &qp_stride, &pp7->qscale_type);
333 
334  if (!ctx->is_disabled) {
335  const int cw = FF_CEIL_RSHIFT(inlink->w, pp7->hsub);
336  const int ch = FF_CEIL_RSHIFT(inlink->h, pp7->vsub);
337 
338  /* get a new frame if in-place is not possible or if the dimensions
339  * are not multiple of 8 */
340  if (!av_frame_is_writable(in) || (inlink->w & 7) || (inlink->h & 7)) {
341  const int aligned_w = FFALIGN(inlink->w, 8);
342  const int aligned_h = FFALIGN(inlink->h, 8);
343 
344  out = ff_get_video_buffer(outlink, aligned_w, aligned_h);
345  if (!out) {
346  av_frame_free(&in);
347  return AVERROR(ENOMEM);
348  }
349  av_frame_copy_props(out, in);
350  out->width = in->width;
351  out->height = in->height;
352  }
353 
354  if (qp_table || pp7->qp) {
355 
356  filter(pp7, out->data[0], in->data[0], out->linesize[0], in->linesize[0],
357  inlink->w, inlink->h, qp_table, qp_stride, 1);
358  filter(pp7, out->data[1], in->data[1], out->linesize[1], in->linesize[1],
359  cw, ch, qp_table, qp_stride, 0);
360  filter(pp7, out->data[2], in->data[2], out->linesize[2], in->linesize[2],
361  cw, ch, qp_table, qp_stride, 0);
362  emms_c();
363  }
364  }
365 
366  if (in != out) {
367  if (in->data[3])
368  av_image_copy_plane(out->data[3], out->linesize[3],
369  in ->data[3], in ->linesize[3],
370  inlink->w, inlink->h);
371  av_frame_free(&in);
372  }
373  return ff_filter_frame(outlink, out);
374 }
375 
376 static av_cold void uninit(AVFilterContext *ctx)
377 {
378  PP7Context *pp7 = ctx->priv;
379  av_freep(&pp7->src);
380 }
381 
382 static const AVFilterPad pp7_inputs[] = {
383  {
384  .name = "default",
385  .type = AVMEDIA_TYPE_VIDEO,
386  .config_props = config_input,
387  .filter_frame = filter_frame,
388  },
389  { NULL }
390 };
391 
392 static const AVFilterPad pp7_outputs[] = {
393  {
394  .name = "default",
395  .type = AVMEDIA_TYPE_VIDEO,
396  },
397  { NULL }
398 };
399 
400 AVFilter ff_vf_pp7 = {
401  .name = "pp7",
402  .description = NULL_IF_CONFIG_SMALL("Apply Postprocessing 7 filter."),
403  .priv_size = sizeof(PP7Context),
404  .uninit = uninit,
405  .query_formats = query_formats,
406  .inputs = pp7_inputs,
407  .outputs = pp7_outputs,
408  .priv_class = &pp7_class,
409  .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,
410 };
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