vf_unsharp.c
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1 /*
2  * Original copyright (c) 2002 Remi Guyomarch <rguyom@pobox.com>
3  * Port copyright (c) 2010 Daniel G. Taylor <dan@programmer-art.org>
4  * Relicensed to the LGPL with permission from Remi Guyomarch.
5  *
6  * This file is part of Libav.
7  *
8  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
39 #include "avfilter.h"
40 #include "formats.h"
41 #include "internal.h"
42 #include "video.h"
43 #include "libavutil/common.h"
44 #include "libavutil/mem.h"
45 #include "libavutil/pixdesc.h"
46 
47 #define MIN_SIZE 3
48 #define MAX_SIZE 13
49 
50 /* right-shift and round-up */
51 #define SHIFTUP(x,shift) (-((-(x))>>(shift)))
52 
53 typedef struct FilterParam {
54  int msize_x;
55  int msize_y;
56  int amount;
57  int steps_x;
58  int steps_y;
59  int scalebits;
61  uint32_t *sc[(MAX_SIZE * MAX_SIZE) - 1];
62 } FilterParam;
63 
64 typedef struct {
67  int hsub, vsub;
69 
70 static void apply_unsharp( uint8_t *dst, int dst_stride,
71  const uint8_t *src, int src_stride,
72  int width, int height, FilterParam *fp)
73 {
74  uint32_t **sc = fp->sc;
75  uint32_t sr[(MAX_SIZE * MAX_SIZE) - 1], tmp1, tmp2;
76 
77  int32_t res;
78  int x, y, z;
79  const uint8_t *src2;
80 
81  if (!fp->amount) {
82  if (dst_stride == src_stride)
83  memcpy(dst, src, src_stride * height);
84  else
85  for (y = 0; y < height; y++, dst += dst_stride, src += src_stride)
86  memcpy(dst, src, width);
87  return;
88  }
89 
90  for (y = 0; y < 2 * fp->steps_y; y++)
91  memset(sc[y], 0, sizeof(sc[y][0]) * (width + 2 * fp->steps_x));
92 
93  for (y = -fp->steps_y; y < height + fp->steps_y; y++) {
94  if (y < height)
95  src2 = src;
96 
97  memset(sr, 0, sizeof(sr[0]) * (2 * fp->steps_x - 1));
98  for (x = -fp->steps_x; x < width + fp->steps_x; x++) {
99  tmp1 = x <= 0 ? src2[0] : x >= width ? src2[width-1] : src2[x];
100  for (z = 0; z < fp->steps_x * 2; z += 2) {
101  tmp2 = sr[z + 0] + tmp1; sr[z + 0] = tmp1;
102  tmp1 = sr[z + 1] + tmp2; sr[z + 1] = tmp2;
103  }
104  for (z = 0; z < fp->steps_y * 2; z += 2) {
105  tmp2 = sc[z + 0][x + fp->steps_x] + tmp1; sc[z + 0][x + fp->steps_x] = tmp1;
106  tmp1 = sc[z + 1][x + fp->steps_x] + tmp2; sc[z + 1][x + fp->steps_x] = tmp2;
107  }
108  if (x >= fp->steps_x && y >= fp->steps_y) {
109  const uint8_t *srx = src - fp->steps_y * src_stride + x - fp->steps_x;
110  uint8_t *dsx = dst - fp->steps_y * dst_stride + x - fp->steps_x;
111 
112  res = (int32_t)*srx + ((((int32_t) * srx - (int32_t)((tmp1 + fp->halfscale) >> fp->scalebits)) * fp->amount) >> 16);
113  *dsx = av_clip_uint8(res);
114  }
115  }
116  if (y >= 0) {
117  dst += dst_stride;
118  src += src_stride;
119  }
120  }
121 }
122 
123 static void set_filter_param(FilterParam *fp, int msize_x, int msize_y, double amount)
124 {
125  fp->msize_x = msize_x;
126  fp->msize_y = msize_y;
127  fp->amount = amount * 65536.0;
128 
129  fp->steps_x = msize_x / 2;
130  fp->steps_y = msize_y / 2;
131  fp->scalebits = (fp->steps_x + fp->steps_y) * 2;
132  fp->halfscale = 1 << (fp->scalebits - 1);
133 }
134 
135 static av_cold int init(AVFilterContext *ctx, const char *args)
136 {
137  UnsharpContext *unsharp = ctx->priv;
138  int lmsize_x = 5, cmsize_x = 5;
139  int lmsize_y = 5, cmsize_y = 5;
140  double lamount = 1.0f, camount = 0.0f;
141 
142  if (args)
143  sscanf(args, "%d:%d:%lf:%d:%d:%lf", &lmsize_x, &lmsize_y, &lamount,
144  &cmsize_x, &cmsize_y, &camount);
145 
146  if ((lamount && (lmsize_x < 2 || lmsize_y < 2)) ||
147  (camount && (cmsize_x < 2 || cmsize_y < 2))) {
148  av_log(ctx, AV_LOG_ERROR,
149  "Invalid value <2 for lmsize_x:%d or lmsize_y:%d or cmsize_x:%d or cmsize_y:%d\n",
150  lmsize_x, lmsize_y, cmsize_x, cmsize_y);
151  return AVERROR(EINVAL);
152  }
153 
154  set_filter_param(&unsharp->luma, lmsize_x, lmsize_y, lamount);
155  set_filter_param(&unsharp->chroma, cmsize_x, cmsize_y, camount);
156 
157  return 0;
158 }
159 
161 {
162  enum AVPixelFormat pix_fmts[] = {
166  };
167 
169 
170  return 0;
171 }
172 
173 static void init_filter_param(AVFilterContext *ctx, FilterParam *fp, const char *effect_type, int width)
174 {
175  int z;
176  const char *effect;
177 
178  effect = fp->amount == 0 ? "none" : fp->amount < 0 ? "blur" : "sharpen";
179 
180  av_log(ctx, AV_LOG_VERBOSE, "effect:%s type:%s msize_x:%d msize_y:%d amount:%0.2f\n",
181  effect, effect_type, fp->msize_x, fp->msize_y, fp->amount / 65535.0);
182 
183  for (z = 0; z < 2 * fp->steps_y; z++)
184  fp->sc[z] = av_malloc(sizeof(*(fp->sc[z])) * (width + 2 * fp->steps_x));
185 }
186 
187 static int config_props(AVFilterLink *link)
188 {
189  UnsharpContext *unsharp = link->dst->priv;
190  const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(link->format);
191 
192  unsharp->hsub = desc->log2_chroma_w;
193  unsharp->vsub = desc->log2_chroma_h;
194 
195  init_filter_param(link->dst, &unsharp->luma, "luma", link->w);
196  init_filter_param(link->dst, &unsharp->chroma, "chroma", SHIFTUP(link->w, unsharp->hsub));
197 
198  return 0;
199 }
200 
202 {
203  int z;
204 
205  for (z = 0; z < 2 * fp->steps_y; z++)
206  av_free(fp->sc[z]);
207 }
208 
209 static av_cold void uninit(AVFilterContext *ctx)
210 {
211  UnsharpContext *unsharp = ctx->priv;
212 
213  free_filter_param(&unsharp->luma);
214  free_filter_param(&unsharp->chroma);
215 }
216 
218 {
219  UnsharpContext *unsharp = link->dst->priv;
220  AVFilterLink *outlink = link->dst->outputs[0];
221  AVFilterBufferRef *out;
222  int cw = SHIFTUP(link->w, unsharp->hsub);
223  int ch = SHIFTUP(link->h, unsharp->vsub);
224 
225  out = ff_get_video_buffer(outlink, AV_PERM_WRITE, outlink->w, outlink->h);
226  if (!out) {
228  return AVERROR(ENOMEM);
229  }
231 
232  apply_unsharp(out->data[0], out->linesize[0], in->data[0], in->linesize[0], link->w, link->h, &unsharp->luma);
233  apply_unsharp(out->data[1], out->linesize[1], in->data[1], in->linesize[1], cw, ch, &unsharp->chroma);
234  apply_unsharp(out->data[2], out->linesize[2], in->data[2], in->linesize[2], cw, ch, &unsharp->chroma);
235 
237  return ff_filter_frame(outlink, out);
238 }
239 
241  {
242  .name = "default",
243  .type = AVMEDIA_TYPE_VIDEO,
244  .filter_frame = filter_frame,
245  .config_props = config_props,
246  .min_perms = AV_PERM_READ,
247  },
248  { NULL }
249 };
250 
252  {
253  .name = "default",
254  .type = AVMEDIA_TYPE_VIDEO,
255  },
256  { NULL }
257 };
258 
260  .name = "unsharp",
261  .description = NULL_IF_CONFIG_SMALL("Sharpen or blur the input video."),
262 
263  .priv_size = sizeof(UnsharpContext),
264 
265  .init = init,
266  .uninit = uninit,
268 
269  .inputs = avfilter_vf_unsharp_inputs,
270 
271  .outputs = avfilter_vf_unsharp_outputs,
272 };
void * av_malloc(size_t size)
Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...
Definition: mem.c:61
const AVPixFmtDescriptor * av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:1435
static const AVFilterPad avfilter_vf_unsharp_inputs[]
Definition: vf_unsharp.c:240
AVFilter avfilter_vf_unsharp
Definition: vf_unsharp.c:259
int linesize[8]
number of bytes per line
Definition: avfilter.h:157
planar YUV 4:4:4, 24bpp, (1 Cr & Cb sample per 1x1 Y samples)
Definition: pixfmt.h:70
static void set_filter_param(FilterParam *fp, int msize_x, int msize_y, double amount)
Definition: vf_unsharp.c:123
static const AVFilterPad outputs[]
Definition: af_ashowinfo.c:122
memory handling functions
int ff_filter_frame(AVFilterLink *link, AVFilterBufferRef *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:459
uint32_t * sc[(MAX_SIZE *MAX_SIZE)-1]
finite state machine storage
Definition: vf_unsharp.c:61
#define MAX_SIZE
Definition: vf_unsharp.c:48
uint8_t log2_chroma_w
Amount to shift the luma width right to find the chroma width.
Definition: pixdesc.h:66
AVFilterFormats * ff_make_format_list(const int *fmts)
Create a list of supported formats.
Definition: formats.c:165
static void apply_unsharp(uint8_t *dst, int dst_stride, const uint8_t *src, int src_stride, int width, int height, FilterParam *fp)
Definition: vf_unsharp.c:70
#define AV_PERM_READ
can read from the buffer
Definition: avfilter.h:97
const char * name
Pad name.
Definition: internal.h:39
uint8_t
struct FilterParam FilterParam
void avfilter_unref_bufferp(AVFilterBufferRef **ref)
Remove a reference to a buffer and set the pointer to NULL.
Definition: buffer.c:88
static const AVFilterPad avfilter_vf_unsharp_outputs[]
Definition: vf_unsharp.c:251
planar YUV 4:4:0 full scale (JPEG), deprecated in favor of PIX_FMT_YUV440P and setting color_range ...
Definition: pixfmt.h:101
planar YUV 4:2:2, 16bpp, full scale (JPEG), deprecated in favor of PIX_FMT_YUV422P and setting color_...
Definition: pixfmt.h:78
void ff_set_common_formats(AVFilterContext *ctx, AVFilterFormats *formats)
A helper for query_formats() which sets all links to the same list of formats.
Definition: formats.c:375
FilterParam luma
luma parameters (width, height, amount)
Definition: vf_unsharp.c:65
A filter pad used for either input or output.
Definition: internal.h:33
#define SHIFTUP(x, shift)
Definition: vf_unsharp.c:51
AVFilterBufferRef * ff_get_video_buffer(AVFilterLink *link, int perms, int w, int h)
Request a picture buffer with a specific set of permissions.
Definition: video.c:145
void av_free(void *ptr)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc(). ...
Definition: mem.c:139
uint8_t log2_chroma_h
Amount to shift the luma height right to find the chroma height.
Definition: pixdesc.h:75
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:88
void * priv
private data for use by the filter
Definition: avfilter.h:439
void av_log(void *avcl, int level, const char *fmt,...)
Definition: log.c:146
planar YUV 4:2:2, 16bpp, (1 Cr & Cb sample per 2x1 Y samples)
Definition: pixfmt.h:69
int msize_x
matrix width
Definition: vf_unsharp.c:54
int scalebits
bits to shift pixel
Definition: vf_unsharp.c:59
planar YUV 4:2:0, 12bpp, full scale (JPEG), deprecated in favor of PIX_FMT_YUV420P and setting color_...
Definition: pixfmt.h:77
static av_cold void uninit(AVFilterContext *ctx)
Definition: vf_unsharp.c:209
int32_t
static void free_filter_param(FilterParam *fp)
Definition: vf_unsharp.c:201
static int config_props(AVFilterLink *link)
Definition: vf_unsharp.c:187
int steps_x
horizontal step count
Definition: vf_unsharp.c:57
A reference to an AVFilterBuffer.
Definition: avfilter.h:139
int amount
effect amount
Definition: vf_unsharp.c:56
NULL
Definition: eval.c:52
static int filter_frame(AVFilterLink *link, AVFilterBufferRef *in)
Definition: vf_unsharp.c:217
static int width
Definition: utils.c:156
Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes...
Definition: pixdesc.h:55
#define fp
Definition: regdef.h:44
planar YUV 4:1:0, 9bpp, (1 Cr & Cb sample per 4x4 Y samples)
Definition: pixfmt.h:71
Filter definition.
Definition: avfilter.h:371
int32_t halfscale
amount to add to pixel
Definition: vf_unsharp.c:60
static const AVFilterPad inputs[]
Definition: af_ashowinfo.c:110
static av_cold int init(AVFilterContext *ctx, const char *args)
Definition: vf_unsharp.c:135
static int query_formats(AVFilterContext *ctx)
Definition: vf_unsharp.c:160
const char * name
filter name
Definition: avfilter.h:372
AVFilterLink ** outputs
array of pointers to output links
Definition: avfilter.h:433
int steps_y
vertical step count
Definition: vf_unsharp.c:58
int msize_y
matrix height
Definition: vf_unsharp.c:55
int height
Definition: gxfenc.c:72
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:65
common internal and external API header
void avfilter_copy_buffer_ref_props(AVFilterBufferRef *dst, AVFilterBufferRef *src)
Copy properties of src to dst, without copying the actual data.
Definition: buffer.c:164
planar YUV 4:4:4, 24bpp, full scale (JPEG), deprecated in favor of PIX_FMT_YUV444P and setting color_...
Definition: pixfmt.h:79
planar YUV 4:1:1, 12bpp, (1 Cr & Cb sample per 4x1 Y samples)
Definition: pixfmt.h:72
#define AV_PERM_WRITE
can write to the buffer
Definition: avfilter.h:98
uint8_t * data[8]
picture/audio data for each plane
Definition: avfilter.h:141
An instance of a filter.
Definition: avfilter.h:418
planar YUV 4:4:0 (1 Cr & Cb sample per 1x2 Y samples)
Definition: pixfmt.h:100
static void init_filter_param(AVFilterContext *ctx, FilterParam *fp, const char *effect_type, int width)
Definition: vf_unsharp.c:173
internal API functions
AVPixelFormat
Pixel format.
Definition: pixfmt.h:63
FilterParam chroma
chroma parameters (width, height, amount)
Definition: vf_unsharp.c:66