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1/*
2 * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
3 * Copyright (c) 2013 Clément Bœsch <u pkh me>
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 * Simple post processing filter
25 *
26 * This implementation is based on an algorithm described in
27 * "Aria Nosratinia Embedded Post-Processing for
28 * Enhancement of Compressed Images (1999)"
29 *
30 * Originally written by Michael Niedermayer for the MPlayer project, and
31 * ported by Clément Bœsch for FFmpeg.
32 */
33
34#include "libavutil/avassert.h"
35#include "libavutil/imgutils.h"
36#include "libavutil/opt.h"
37#include "libavutil/pixdesc.h"
38#include "internal.h"
39#include "vf_spp.h"
40
41enum mode {
42 MODE_HARD,
43 MODE_SOFT,
44 NB_MODES
45};
46
47static const AVClass *child_class_next(const AVClass *prev)
48{
49 return prev ? NULL : avcodec_dct_get_class();
50}
51
52static void *child_next(void *obj, void *prev)
53{
54 SPPContext *s = obj;
55 return prev ? NULL : s->dct;
56}
57
58#define OFFSET(x) offsetof(SPPContext, x)
59#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
60static const AVOption spp_options[] = {
61 { "quality", "set quality", OFFSET(log2_count), AV_OPT_TYPE_INT, {.i64 = 3}, 0, MAX_LEVEL, FLAGS },
62 { "qp", "force a constant quantizer parameter", OFFSET(qp), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 63, FLAGS },
63 { "mode", "set thresholding mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64 = MODE_HARD}, 0, NB_MODES - 1, FLAGS, "mode" },
64 { "hard", "hard thresholding", 0, AV_OPT_TYPE_CONST, {.i64 = MODE_HARD}, INT_MIN, INT_MAX, FLAGS, "mode" },
65 { "soft", "soft thresholding", 0, AV_OPT_TYPE_CONST, {.i64 = MODE_SOFT}, INT_MIN, INT_MAX, FLAGS, "mode" },
66 { "use_bframe_qp", "use B-frames' QP", OFFSET(use_bframe_qp), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, FLAGS },
67 { NULL }
68};
69
70static const AVClass spp_class = {
71 .class_name = "spp",
72 .item_name = av_default_item_name,
73 .option = spp_options,
74 .version = LIBAVUTIL_VERSION_INT,
75 .category = AV_CLASS_CATEGORY_FILTER,
76 .child_class_next = child_class_next,
77 .child_next = child_next,
78};
79
80// XXX: share between filters?
81DECLARE_ALIGNED(8, static const uint8_t, ldither)[8][8] = {
82 { 0, 48, 12, 60, 3, 51, 15, 63 },
83 { 32, 16, 44, 28, 35, 19, 47, 31 },
84 { 8, 56, 4, 52, 11, 59, 7, 55 },
85 { 40, 24, 36, 20, 43, 27, 39, 23 },
86 { 2, 50, 14, 62, 1, 49, 13, 61 },
87 { 34, 18, 46, 30, 33, 17, 45, 29 },
88 { 10, 58, 6, 54, 9, 57, 5, 53 },
89 { 42, 26, 38, 22, 41, 25, 37, 21 },
90};
91
92static const uint8_t offset[127][2] = {
93 {0,0},
94 {0,0}, {4,4}, // quality = 1
95 {0,0}, {2,2}, {6,4}, {4,6}, // quality = 2
96 {0,0}, {5,1}, {2,2}, {7,3}, {4,4}, {1,5}, {6,6}, {3,7}, // quality = 3
97
98 {0,0}, {4,0}, {1,1}, {5,1}, {3,2}, {7,2}, {2,3}, {6,3}, // quality = 4
99 {0,4}, {4,4}, {1,5}, {5,5}, {3,6}, {7,6}, {2,7}, {6,7},
100
101 {0,0}, {0,2}, {0,4}, {0,6}, {1,1}, {1,3}, {1,5}, {1,7}, // quality = 5
102 {2,0}, {2,2}, {2,4}, {2,6}, {3,1}, {3,3}, {3,5}, {3,7},
103 {4,0}, {4,2}, {4,4}, {4,6}, {5,1}, {5,3}, {5,5}, {5,7},
104 {6,0}, {6,2}, {6,4}, {6,6}, {7,1}, {7,3}, {7,5}, {7,7},
105
106 {0,0}, {4,4}, {0,4}, {4,0}, {2,2}, {6,6}, {2,6}, {6,2}, // quality = 6
107 {0,2}, {4,6}, {0,6}, {4,2}, {2,0}, {6,4}, {2,4}, {6,0},
108 {1,1}, {5,5}, {1,5}, {5,1}, {3,3}, {7,7}, {3,7}, {7,3},
109 {1,3}, {5,7}, {1,7}, {5,3}, {3,1}, {7,5}, {3,5}, {7,1},
110 {0,1}, {4,5}, {0,5}, {4,1}, {2,3}, {6,7}, {2,7}, {6,3},
111 {0,3}, {4,7}, {0,7}, {4,3}, {2,1}, {6,5}, {2,5}, {6,1},
112 {1,0}, {5,4}, {1,4}, {5,0}, {3,2}, {7,6}, {3,6}, {7,2},
113 {1,2}, {5,6}, {1,6}, {5,2}, {3,0}, {7,4}, {3,4}, {7,0},
114};
115
116static void hardthresh_c(int16_t dst[64], const int16_t src[64],
117 int qp, const uint8_t *permutation)
118{
119 int i;
120 int bias = 0; // FIXME
121
122 unsigned threshold1 = qp * ((1<<4) - bias) - 1;
123 unsigned threshold2 = threshold1 << 1;
124
125 memset(dst, 0, 64 * sizeof(dst[0]));
126 dst[0] = (src[0] + 4) >> 3;
127
128 for (i = 1; i < 64; i++) {
129 int level = src[i];
130 if (((unsigned)(level + threshold1)) > threshold2) {
131 const int j = permutation[i];
132 dst[j] = (level + 4) >> 3;
133 }
134 }
135}
136
137static void softthresh_c(int16_t dst[64], const int16_t src[64],
138 int qp, const uint8_t *permutation)
139{
140 int i;
141 int bias = 0; //FIXME
142
143 unsigned threshold1 = qp * ((1<<4) - bias) - 1;
144 unsigned threshold2 = threshold1 << 1;
145
146 memset(dst, 0, 64 * sizeof(dst[0]));
147 dst[0] = (src[0] + 4) >> 3;
148
149 for (i = 1; i < 64; i++) {
150 int level = src[i];
151 if (((unsigned)(level + threshold1)) > threshold2) {
152 const int j = permutation[i];
153 if (level > 0) dst[j] = (level - threshold1 + 4) >> 3;
154 else dst[j] = (level + threshold1 + 4) >> 3;
155 }
156 }
157}
158
159static void store_slice_c(uint8_t *dst, const int16_t *src,
160 int dst_linesize, int src_linesize,
161 int width, int height, int log2_scale,
162 const uint8_t dither[8][8])
163{
164 int y, x;
165
166#define STORE(pos) do { \
167 temp = ((src[x + y*src_linesize + pos] << log2_scale) + d[pos]) >> 6; \
168 if (temp & 0x100) \
169 temp = ~(temp >> 31); \
170 dst[x + y*dst_linesize + pos] = temp; \
171} while (0)
172
173 for (y = 0; y < height; y++) {
174 const uint8_t *d = dither[y];
175 for (x = 0; x < width; x += 8) {
176 int temp;
177 STORE(0);
178 STORE(1);
179 STORE(2);
180 STORE(3);
181 STORE(4);
182 STORE(5);
183 STORE(6);
184 STORE(7);
185 }
186 }
187}
188
189static void store_slice16_c(uint16_t *dst, const int16_t *src,
190 int dst_linesize, int src_linesize,
191 int width, int height, int log2_scale,
192 const uint8_t dither[8][8], int depth)
193{
194 int y, x;
195 unsigned int mask = -1<<depth;
196
197#define STORE16(pos) do { \
198 temp = ((src[x + y*src_linesize + pos] << log2_scale) + (d[pos]>>1)) >> 5; \
199 if (temp & mask ) \
200 temp = ~(temp >> 31); \
201 dst[x + y*dst_linesize + pos] = temp; \
202} while (0)
203
204 for (y = 0; y < height; y++) {
205 const uint8_t *d = dither[y];
206 for (x = 0; x < width; x += 8) {
207 int temp;
208 STORE16(0);
209 STORE16(1);
210 STORE16(2);
211 STORE16(3);
212 STORE16(4);
213 STORE16(5);
214 STORE16(6);
215 STORE16(7);
216 }
217 }
218}
219
220static inline void add_block(uint16_t *dst, int linesize, const int16_t block[64])
221{
222 int y;
223
224 for (y = 0; y < 8; y++) {
225 *(uint32_t *)&dst[0 + y*linesize] += *(uint32_t *)&block[0 + y*8];
226 *(uint32_t *)&dst[2 + y*linesize] += *(uint32_t *)&block[2 + y*8];
227 *(uint32_t *)&dst[4 + y*linesize] += *(uint32_t *)&block[4 + y*8];
228 *(uint32_t *)&dst[6 + y*linesize] += *(uint32_t *)&block[6 + y*8];
229 }
230}
231
232static void filter(SPPContext *p, uint8_t *dst, uint8_t *src,
233 int dst_linesize, int src_linesize, int width, int height,
234 const uint8_t *qp_table, int qp_stride, int is_luma, int depth)
235{
236 int x, y, i;
237 const int count = 1 << p->log2_count;
238 const int linesize = is_luma ? p->temp_linesize : FFALIGN(width+16, 16);
239 DECLARE_ALIGNED(16, uint64_t, block_align)[32];
240 int16_t *block = (int16_t *)block_align;
241 int16_t *block2 = (int16_t *)(block_align + 16);
242 uint16_t *psrc16 = (uint16_t*)p->src;
243 const int sample_bytes = (depth+7) / 8;
244
245 for (y = 0; y < height; y++) {
246 int index = 8 + 8*linesize + y*linesize;
247 memcpy(p->src + index*sample_bytes, src + y*src_linesize, width*sample_bytes);
248 if (sample_bytes == 1) {
249 for (x = 0; x < 8; x++) {
250 p->src[index - x - 1] = p->src[index + x ];
251 p->src[index + width + x ] = p->src[index + width - x - 1];
252 }
253 } else {
254 for (x = 0; x < 8; x++) {
255 psrc16[index - x - 1] = psrc16[index + x ];
256 psrc16[index + width + x ] = psrc16[index + width - x - 1];
257 }
258 }
259 }
260 for (y = 0; y < 8; y++) {
261 memcpy(p->src + ( 7-y)*linesize * sample_bytes, p->src + ( y+8)*linesize * sample_bytes, linesize * sample_bytes);
262 memcpy(p->src + (height+8+y)*linesize * sample_bytes, p->src + (height-y+7)*linesize * sample_bytes, linesize * sample_bytes);
263 }
264
265 for (y = 0; y < height + 8; y += 8) {
266 memset(p->temp + (8 + y) * linesize, 0, 8 * linesize * sizeof(*p->temp));
267 for (x = 0; x < width + 8; x += 8) {
268 int qp;
269
270 if (p->qp) {
271 qp = p->qp;
272 } else{
273 const int qps = 3 + is_luma;
274 qp = qp_table[(FFMIN(x, width - 1) >> qps) + (FFMIN(y, height - 1) >> qps) * qp_stride];
275 qp = FFMAX(1, ff_norm_qscale(qp, p->qscale_type));
276 }
277 for (i = 0; i < count; i++) {
278 const int x1 = x + offset[i + count - 1][0];
279 const int y1 = y + offset[i + count - 1][1];
280 const int index = x1 + y1*linesize;
281 p->dct->get_pixels(block, p->src + sample_bytes*index, sample_bytes*linesize);
282 p->dct->fdct(block);
283 p->requantize(block2, block, qp, p->dct->idct_permutation);
284 p->dct->idct(block2);
285 add_block(p->temp + index, linesize, block2);
286 }
287 }
288 if (y) {
289 if (sample_bytes == 1) {
290 p->store_slice(dst + (y - 8) * dst_linesize, p->temp + 8 + y*linesize,
291 dst_linesize, linesize, width,
292 FFMIN(8, height + 8 - y), MAX_LEVEL - p->log2_count,
293 ldither);
294 } else {
295 store_slice16_c((uint16_t*)(dst + (y - 8) * dst_linesize), p->temp + 8 + y*linesize,
296 dst_linesize/2, linesize, width,
297 FFMIN(8, height + 8 - y), MAX_LEVEL - p->log2_count,
298 ldither, depth);
299 }
300 }
301 }
302}
303
304static int query_formats(AVFilterContext *ctx)
305{
306 static const enum AVPixelFormat pix_fmts[] = {
307 AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P,
308 AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV411P,
309 AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV440P,
310 AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ422P,
311 AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ440P,
312 AV_PIX_FMT_YUV444P10, AV_PIX_FMT_YUV422P10,
313 AV_PIX_FMT_YUV420P10,
314 AV_PIX_FMT_YUV444P9, AV_PIX_FMT_YUV422P9,
315 AV_PIX_FMT_YUV420P9,
316 AV_PIX_FMT_GRAY8,
317 AV_PIX_FMT_GBRP,
318 AV_PIX_FMT_GBRP9,
319 AV_PIX_FMT_GBRP10,
320 AV_PIX_FMT_NONE
321 };
322
323 AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
324 if (!fmts_list)
325 return AVERROR(ENOMEM);
326 return ff_set_common_formats(ctx, fmts_list);
327}
328
329static int config_input(AVFilterLink *inlink)
330{
331 SPPContext *s = inlink->dst->priv;
332 const int h = FFALIGN(inlink->h + 16, 16);
333 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
334 const int bps = desc->comp[0].depth;
335
336 av_opt_set_int(s->dct, "bits_per_sample", bps, 0);
337 avcodec_dct_init(s->dct);
338
339 if (ARCH_X86)
340 ff_spp_init_x86(s);
341
342 s->hsub = desc->log2_chroma_w;
343 s->vsub = desc->log2_chroma_h;
344 s->temp_linesize = FFALIGN(inlink->w + 16, 16);
345 s->temp = av_malloc_array(s->temp_linesize, h * sizeof(*s->temp));
346 s->src = av_malloc_array(s->temp_linesize, h * sizeof(*s->src) * 2);
347
348 if (!s->temp || !s->src)
349 return AVERROR(ENOMEM);
350 return 0;
351}
352
353static int filter_frame(AVFilterLink *inlink, AVFrame *in)
354{
355 AVFilterContext *ctx = inlink->dst;
356 SPPContext *s = ctx->priv;
357 AVFilterLink *outlink = ctx->outputs[0];
358 AVFrame *out = in;
359 int qp_stride = 0;
360 const int8_t *qp_table = NULL;
361 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
362 const int depth = desc->comp[0].depth;
363
364 /* if we are not in a constant user quantizer mode and we don't want to use
365 * the quantizers from the B-frames (B-frames often have a higher QP), we
366 * need to save the qp table from the last non B-frame; this is what the
367 * following code block does */
368 if (!s->qp) {
369 qp_table = av_frame_get_qp_table(in, &qp_stride, &s->qscale_type);
370
371 if (qp_table && !s->use_bframe_qp && in->pict_type != AV_PICTURE_TYPE_B) {
372 int w, h;
373
374 /* if the qp stride is not set, it means the QP are only defined on
375 * a line basis */
376 if (!qp_stride) {
377 w = AV_CEIL_RSHIFT(inlink->w, 4);
378 h = 1;
379 } else {
380 w = qp_stride;
381 h = AV_CEIL_RSHIFT(inlink->h, 4);
382 }
383
384 if (w * h > s->non_b_qp_alloc_size) {
385 int ret = av_reallocp_array(&s->non_b_qp_table, w, h);
386 if (ret < 0) {
387 s->non_b_qp_alloc_size = 0;
388 return ret;
389 }
390 s->non_b_qp_alloc_size = w * h;
391 }
392
393 av_assert0(w * h <= s->non_b_qp_alloc_size);
394 memcpy(s->non_b_qp_table, qp_table, w * h);
395 }
396 }
397
398 if (s->log2_count && !ctx->is_disabled) {
399 if (!s->use_bframe_qp && s->non_b_qp_table)
400 qp_table = s->non_b_qp_table;
401
402 if (qp_table || s->qp) {
403 const int cw = AV_CEIL_RSHIFT(inlink->w, s->hsub);
404 const int ch = AV_CEIL_RSHIFT(inlink->h, s->vsub);
405
406 /* get a new frame if in-place is not possible or if the dimensions
407 * are not multiple of 8 */
408 if (!av_frame_is_writable(in) || (inlink->w & 7) || (inlink->h & 7)) {
409 const int aligned_w = FFALIGN(inlink->w, 8);
410 const int aligned_h = FFALIGN(inlink->h, 8);
411
412 out = ff_get_video_buffer(outlink, aligned_w, aligned_h);
413 if (!out) {
414 av_frame_free(&in);
415 return AVERROR(ENOMEM);
416 }
417 av_frame_copy_props(out, in);
418 out->width = in->width;
419 out->height = in->height;
420 }
421
422 filter(s, out->data[0], in->data[0], out->linesize[0], in->linesize[0], inlink->w, inlink->h, qp_table, qp_stride, 1, depth);
423
424 if (out->data[2]) {
425 filter(s, out->data[1], in->data[1], out->linesize[1], in->linesize[1], cw, ch, qp_table, qp_stride, 0, depth);
426 filter(s, out->data[2], in->data[2], out->linesize[2], in->linesize[2], cw, ch, qp_table, qp_stride, 0, depth);
427 }
428 emms_c();
429 }
430 }
431
432 if (in != out) {
433 if (in->data[3])
434 av_image_copy_plane(out->data[3], out->linesize[3],
435 in ->data[3], in ->linesize[3],
436 inlink->w, inlink->h);
437 av_frame_free(&in);
438 }
439 return ff_filter_frame(outlink, out);
440}
441
442static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
443 char *res, int res_len, int flags)
444{
445 SPPContext *s = ctx->priv;
446
447 if (!strcmp(cmd, "level")) {
448 if (!strcmp(args, "max"))
449 s->log2_count = MAX_LEVEL;
450 else
451 s->log2_count = av_clip(strtol(args, NULL, 10), 0, MAX_LEVEL);
452 return 0;
453 }
454 return AVERROR(ENOSYS);
455}
456
457static av_cold int init_dict(AVFilterContext *ctx, AVDictionary **opts)
458{
459 SPPContext *s = ctx->priv;
460 int ret;
461
462 s->avctx = avcodec_alloc_context3(NULL);
463 s->dct = avcodec_dct_alloc();
464 if (!s->avctx || !s->dct)
465 return AVERROR(ENOMEM);
466
467 if (opts) {
468 AVDictionaryEntry *e = NULL;
469
470 while ((e = av_dict_get(*opts, "", e, AV_DICT_IGNORE_SUFFIX))) {
471 if ((ret = av_opt_set(s->dct, e->key, e->value, 0)) < 0)
472 return ret;
473 }
474 av_dict_free(opts);
475 }
476
477 s->store_slice = store_slice_c;
478 switch (s->mode) {
479 case MODE_HARD: s->requantize = hardthresh_c; break;
480 case MODE_SOFT: s->requantize = softthresh_c; break;
481 }
482 return 0;
483}
484
485static av_cold void uninit(AVFilterContext *ctx)
486{
487 SPPContext *s = ctx->priv;
488
489 av_freep(&s->temp);
490 av_freep(&s->src);
491 if (s->avctx) {
492 avcodec_close(s->avctx);
493 av_freep(&s->avctx);
494 }
495 av_freep(&s->dct);
496 av_freep(&s->non_b_qp_table);
497}
498
499static const AVFilterPad spp_inputs[] = {
500 {
501 .name = "default",
502 .type = AVMEDIA_TYPE_VIDEO,
503 .config_props = config_input,
504 .filter_frame = filter_frame,
505 },
506 { NULL }
507};
508
509static const AVFilterPad spp_outputs[] = {
510 {
511 .name = "default",
512 .type = AVMEDIA_TYPE_VIDEO,
513 },
514 { NULL }
515};
516
517AVFilter ff_vf_spp = {
518 .name = "spp",
519 .description = NULL_IF_CONFIG_SMALL("Apply a simple post processing filter."),
520 .priv_size = sizeof(SPPContext),
521 .init_dict = init_dict,
522 .uninit = uninit,
523 .query_formats = query_formats,
524 .inputs = spp_inputs,
525 .outputs = spp_outputs,
526 .process_command = process_command,
527 .priv_class = &spp_class,
528 .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,
529};
530
generated by cgit at 2024-05-18 08:39:22 (GMT)