FFmpeg  4.4.6
vf_find_rect.c
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1 /*
2  * Copyright (c) 2014-2015 Michael Niedermayer <michaelni@gmx.at>
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation; either version 2 of the License, or
9  * (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14  * GNU General Public License for more details.
15  *
16  * You should have received a copy of the GNU General Public License along
17  * with FFmpeg; if not, write to the Free Software Foundation, Inc.,
18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
19  */
20 
21 /**
22  * @todo switch to dualinput
23  */
24 
25 #include "libavutil/imgutils.h"
26 #include "libavutil/opt.h"
27 #include "internal.h"
28 
29 #include "lavfutils.h"
30 
31 #define MAX_MIPMAPS 5
32 
33 typedef struct FOCContext {
34  AVClass *class;
35  float threshold;
36  int mipmaps;
37  int xmin, ymin, xmax, ymax;
38  char *obj_filename;
39  int last_x, last_y;
43 } FOCContext;
44 
45 #define OFFSET(x) offsetof(FOCContext, x)
46 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
47 static const AVOption find_rect_options[] = {
48  { "object", "object bitmap filename", OFFSET(obj_filename), AV_OPT_TYPE_STRING, {.str = NULL}, .flags = FLAGS },
49  { "threshold", "set threshold", OFFSET(threshold), AV_OPT_TYPE_FLOAT, {.dbl = 0.5}, 0, 1.0, FLAGS },
50  { "mipmaps", "set mipmaps", OFFSET(mipmaps), AV_OPT_TYPE_INT, {.i64 = 3}, 1, MAX_MIPMAPS, FLAGS },
51  { "xmin", "", OFFSET(xmin), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, FLAGS },
52  { "ymin", "", OFFSET(ymin), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, FLAGS },
53  { "xmax", "", OFFSET(xmax), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, FLAGS },
54  { "ymax", "", OFFSET(ymax), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, FLAGS },
55  { NULL }
56 };
57 
59 
61 {
62  static const enum AVPixelFormat pix_fmts[] = {
66  };
67 
69 }
70 
72 {
73  int x, y;
75  uint8_t *src, *dst;
76  if (!frame)
77  return NULL;
78 
79  frame->format = in->format;
80  frame->width = (in->width + 1) / 2;
81  frame->height = (in->height+ 1) / 2;
82 
83  if (av_frame_get_buffer(frame, 0) < 0) {
85  return NULL;
86  }
87  src = in ->data[0];
88  dst = frame->data[0];
89 
90  for(y = 0; y < frame->height; y++) {
91  for(x = 0; x < frame->width; x++) {
92  dst[x] = ( src[2*x+0]
93  + src[2*x+1]
94  + src[2*x+0 + in->linesize[0]]
95  + src[2*x+1 + in->linesize[0]]
96  + 2) >> 2;
97  }
98  src += 2*in->linesize[0];
99  dst += frame->linesize[0];
100  }
101  return frame;
102 }
103 
104 static float compare(const AVFrame *haystack, const AVFrame *obj, int offx, int offy)
105 {
106  int x,y;
107  int o_sum_v = 0;
108  int h_sum_v = 0;
109  int64_t oo_sum_v = 0;
110  int64_t hh_sum_v = 0;
111  int64_t oh_sum_v = 0;
112  float c;
113  int n = obj->height * obj->width;
114  const uint8_t *odat = obj ->data[0];
115  const uint8_t *hdat = haystack->data[0] + offx + offy * haystack->linesize[0];
116  int64_t o_sigma, h_sigma;
117 
118  for(y = 0; y < obj->height; y++) {
119  for(x = 0; x < obj->width; x++) {
120  int o_v = odat[x];
121  int h_v = hdat[x];
122  o_sum_v += o_v;
123  h_sum_v += h_v;
124  oo_sum_v += o_v * o_v;
125  hh_sum_v += h_v * h_v;
126  oh_sum_v += o_v * h_v;
127  }
128  odat += obj->linesize[0];
129  hdat += haystack->linesize[0];
130  }
131  o_sigma = n*oo_sum_v - o_sum_v*(int64_t)o_sum_v;
132  h_sigma = n*hh_sum_v - h_sum_v*(int64_t)h_sum_v;
133 
134  if (o_sigma == 0 || h_sigma == 0)
135  return 1.0;
136 
137  c = (n*oh_sum_v - o_sum_v*(int64_t)h_sum_v) / (sqrt(o_sigma)*sqrt(h_sigma));
138 
139  return 1 - fabs(c);
140 }
141 
142 static int config_input(AVFilterLink *inlink)
143 {
144  AVFilterContext *ctx = inlink->dst;
145  FOCContext *foc = ctx->priv;
146 
147  if (foc->xmax <= 0)
148  foc->xmax = inlink->w - foc->obj_frame->width;
149  if (foc->ymax <= 0)
150  foc->ymax = inlink->h - foc->obj_frame->height;
151 
152  return 0;
153 }
154 
155 static float search(FOCContext *foc, int pass, int maxpass, int xmin, int xmax, int ymin, int ymax, int *best_x, int *best_y, float best_score)
156 {
157  int x, y;
158 
159  if (pass + 1 <= maxpass) {
160  int sub_x, sub_y;
161  search(foc, pass+1, maxpass, xmin>>1, (xmax+1)>>1, ymin>>1, (ymax+1)>>1, &sub_x, &sub_y, 2.0);
162  xmin = FFMAX(xmin, 2*sub_x - 4);
163  xmax = FFMIN(xmax, 2*sub_x + 4);
164  ymin = FFMAX(ymin, 2*sub_y - 4);
165  ymax = FFMIN(ymax, 2*sub_y + 4);
166  }
167 
168  for (y = ymin; y <= ymax; y++) {
169  for (x = xmin; x <= xmax; x++) {
170  float score = compare(foc->haystack_frame[pass], foc->needle_frame[pass], x, y);
171  if (score < best_score) {
172  best_score = score;
173  *best_x = x;
174  *best_y = y;
175  }
176  }
177  }
178  return best_score;
179 }
180 
181 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
182 {
183  AVFilterContext *ctx = inlink->dst;
184  FOCContext *foc = ctx->priv;
185  float best_score;
186  int best_x, best_y;
187  int i;
188 
189  foc->haystack_frame[0] = av_frame_clone(in);
190  for (i=1; i<foc->mipmaps; i++) {
191  foc->haystack_frame[i] = downscale(foc->haystack_frame[i-1]);
192  }
193 
194  best_score = search(foc, 0, 0,
195  FFMAX(foc->xmin, foc->last_x - 8),
196  FFMIN(foc->xmax, foc->last_x + 8),
197  FFMAX(foc->ymin, foc->last_y - 8),
198  FFMIN(foc->ymax, foc->last_y + 8),
199  &best_x, &best_y, 2.0);
200 
201  best_score = search(foc, 0, foc->mipmaps - 1, foc->xmin, foc->xmax, foc->ymin, foc->ymax,
202  &best_x, &best_y, best_score);
203 
204  for (i=0; i<MAX_MIPMAPS; i++) {
206  }
207 
208  if (best_score > foc->threshold) {
209  return ff_filter_frame(ctx->outputs[0], in);
210  }
211 
212  av_log(ctx, AV_LOG_DEBUG, "Found at %d %d score %f\n", best_x, best_y, best_score);
213  foc->last_x = best_x;
214  foc->last_y = best_y;
215 
217 
218  av_dict_set_int(&in->metadata, "lavfi.rect.w", foc->obj_frame->width, 0);
219  av_dict_set_int(&in->metadata, "lavfi.rect.h", foc->obj_frame->height, 0);
220  av_dict_set_int(&in->metadata, "lavfi.rect.x", best_x, 0);
221  av_dict_set_int(&in->metadata, "lavfi.rect.y", best_y, 0);
222 
223  return ff_filter_frame(ctx->outputs[0], in);
224 }
225 
227 {
228  FOCContext *foc = ctx->priv;
229  int i;
230 
231  for (i = 0; i < MAX_MIPMAPS; i++) {
232  av_frame_free(&foc->needle_frame[i]);
234  }
235 
236  if (foc->obj_frame)
237  av_freep(&foc->obj_frame->data[0]);
238  av_frame_free(&foc->obj_frame);
239 }
240 
242 {
243  FOCContext *foc = ctx->priv;
244  int ret, i;
245 
246  if (!foc->obj_filename) {
247  av_log(ctx, AV_LOG_ERROR, "object filename not set\n");
248  return AVERROR(EINVAL);
249  }
250 
251  foc->obj_frame = av_frame_alloc();
252  if (!foc->obj_frame)
253  return AVERROR(ENOMEM);
254 
255  if ((ret = ff_load_image(foc->obj_frame->data, foc->obj_frame->linesize,
256  &foc->obj_frame->width, &foc->obj_frame->height,
257  &foc->obj_frame->format, foc->obj_filename, ctx)) < 0)
258  return ret;
259 
260  if (foc->obj_frame->format != AV_PIX_FMT_GRAY8) {
261  av_log(ctx, AV_LOG_ERROR, "object image is not a grayscale image\n");
262  return AVERROR(EINVAL);
263  }
264 
265  foc->needle_frame[0] = av_frame_clone(foc->obj_frame);
266  for (i = 1; i < foc->mipmaps; i++) {
267  foc->needle_frame[i] = downscale(foc->needle_frame[i-1]);
268  if (!foc->needle_frame[i])
269  return AVERROR(ENOMEM);
270  }
271 
272  return 0;
273 }
274 
275 static const AVFilterPad foc_inputs[] = {
276  {
277  .name = "default",
278  .type = AVMEDIA_TYPE_VIDEO,
279  .config_props = config_input,
280  .filter_frame = filter_frame,
281  },
282  { NULL }
283 };
284 
285 static const AVFilterPad foc_outputs[] = {
286  {
287  .name = "default",
288  .type = AVMEDIA_TYPE_VIDEO,
289  },
290  { NULL }
291 };
292 
294  .name = "find_rect",
295  .description = NULL_IF_CONFIG_SMALL("Find a user specified object."),
296  .priv_size = sizeof(FOCContext),
297  .init = init,
298  .uninit = uninit,
300  .inputs = foc_inputs,
301  .outputs = foc_outputs,
302  .priv_class = &find_rect_class,
303 };
static const AVFilterPad inputs[]
Definition: af_acontrast.c:193
static const AVFilterPad outputs[]
Definition: af_acontrast.c:203
#define av_cold
Definition: attributes.h:88
uint8_t pi<< 24) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_U8, uint8_t,(*(const uint8_t *) pi - 0x80) *(1.0f/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_U8, uint8_t,(*(const uint8_t *) pi - 0x80) *(1.0/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S16, int16_t,(*(const int16_t *) pi >> 8)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S16, int16_t, *(const int16_t *) pi *(1.0f/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S16, int16_t, *(const int16_t *) pi *(1.0/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S32, int32_t,(*(const int32_t *) pi >> 24)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S32, int32_t, *(const int32_t *) pi *(1.0f/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S32, int32_t, *(const int32_t *) pi *(1.0/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_FLT, float, av_clip_uint8(lrintf(*(const float *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, float, av_clip_int16(lrintf(*(const float *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, float, av_clipl_int32(llrintf(*(const float *) pi *(1U<< 31)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_DBL, double, av_clip_uint8(lrint(*(const double *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, double, av_clip_int16(lrint(*(const double *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, double, av_clipl_int32(llrint(*(const double *) pi *(1U<< 31)))) #define SET_CONV_FUNC_GROUP(ofmt, ifmt) static void set_generic_function(AudioConvert *ac) { } void ff_audio_convert_free(AudioConvert **ac) { if(! *ac) return;ff_dither_free(&(*ac) ->dc);av_freep(ac);} AudioConvert *ff_audio_convert_alloc(AVAudioResampleContext *avr, enum AVSampleFormat out_fmt, enum AVSampleFormat in_fmt, int channels, int sample_rate, int apply_map) { AudioConvert *ac;int in_planar, out_planar;ac=av_mallocz(sizeof(*ac));if(!ac) return NULL;ac->avr=avr;ac->out_fmt=out_fmt;ac->in_fmt=in_fmt;ac->channels=channels;ac->apply_map=apply_map;if(avr->dither_method !=AV_RESAMPLE_DITHER_NONE &&av_get_packed_sample_fmt(out_fmt)==AV_SAMPLE_FMT_S16 &&av_get_bytes_per_sample(in_fmt) > 2) { ac->dc=ff_dither_alloc(avr, out_fmt, in_fmt, channels, sample_rate, apply_map);if(!ac->dc) { av_free(ac);return NULL;} return ac;} in_planar=ff_sample_fmt_is_planar(in_fmt, channels);out_planar=ff_sample_fmt_is_planar(out_fmt, channels);if(in_planar==out_planar) { ac->func_type=CONV_FUNC_TYPE_FLAT;ac->planes=in_planar ? ac->channels :1;} else if(in_planar) ac->func_type=CONV_FUNC_TYPE_INTERLEAVE;else ac->func_type=CONV_FUNC_TYPE_DEINTERLEAVE;set_generic_function(ac);if(ARCH_AARCH64) ff_audio_convert_init_aarch64(ac);if(ARCH_ARM) ff_audio_convert_init_arm(ac);if(ARCH_X86) ff_audio_convert_init_x86(ac);return ac;} int ff_audio_convert(AudioConvert *ac, AudioData *out, AudioData *in) { int use_generic=1;int len=in->nb_samples;int p;if(ac->dc) { av_log(ac->avr, AV_LOG_TRACE, "%d samples - audio_convert: %s to %s (dithered)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt));return ff_convert_dither(ac-> in
uint8_t
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:1096
#define FFMIN(a, b)
Definition: common.h:105
#define FFMAX(a, b)
Definition: common.h:103
#define NULL
Definition: coverity.c:32
long long int64_t
Definition: coverity.c:34
static __device__ float fabs(float a)
Definition: cuda_runtime.h:182
static AVFrame * frame
int 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:587
AVFilterFormats * ff_make_format_list(const int *fmts)
Create a list of supported formats.
Definition: formats.c:286
@ AV_OPT_TYPE_INT
Definition: opt.h:225
@ AV_OPT_TYPE_FLOAT
Definition: opt.h:228
@ AV_OPT_TYPE_STRING
Definition: opt.h:229
int av_dict_set_int(AVDictionary **pm, const char *key, int64_t value, int flags)
Convenience wrapper for av_dict_set that converts the value to a string and stores it.
Definition: dict.c:147
#define AVERROR(e)
Definition: error.h:43
AVFrame * av_frame_clone(const AVFrame *src)
Create a new frame that references the same data as src.
Definition: frame.c:540
int av_frame_get_buffer(AVFrame *frame, int align)
Allocate new buffer(s) for audio or video data.
Definition: frame.c:337
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:203
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:190
int av_frame_make_writable(AVFrame *frame)
Ensure that the frame data is writable, avoiding data copy if possible.
Definition: frame.c:611
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:215
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:194
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
misc image utilities
int i
Definition: input.c:407
int ff_load_image(uint8_t *data[4], int linesize[4], int *w, int *h, enum AVPixelFormat *pix_fmt, const char *filename, void *log_ctx)
Load image from filename and put the resulting image in data.
Definition: lavfutils.c:25
Miscellaneous utilities which make use of the libavformat library.
common internal API header
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
static enum AVPixelFormat pix_fmts[]
Definition: libkvazaar.c:309
AVOptions.
AVPixelFormat
Pixel format.
Definition: pixfmt.h:64
@ AV_PIX_FMT_NONE
Definition: pixfmt.h:65
@ AV_PIX_FMT_YUV420P
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:66
@ AV_PIX_FMT_GRAY8
Y , 8bpp.
Definition: pixfmt.h:74
@ AV_PIX_FMT_YUVJ420P
planar YUV 4:2:0, 12bpp, full scale (JPEG), deprecated in favor of AV_PIX_FMT_YUV420P and setting col...
Definition: pixfmt.h:78
Describe the class of an AVClass context structure.
Definition: log.h:67
An instance of a filter.
Definition: avfilter.h:341
A filter pad used for either input or output.
Definition: internal.h:54
const char * name
Pad name.
Definition: internal.h:60
Filter definition.
Definition: avfilter.h:145
const char * name
Filter name.
Definition: avfilter.h:149
This structure describes decoded (raw) audio or video data.
Definition: frame.h:318
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:332
int width
Definition: frame.h:376
int height
Definition: frame.h:376
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:349
int format
format of the frame, -1 if unknown or unset Values correspond to enum AVPixelFormat for video frames,...
Definition: frame.h:391
AVOption.
Definition: opt.h:248
float threshold
Definition: vf_find_rect.c:35
AVFrame * obj_frame
Definition: vf_find_rect.c:40
char * obj_filename
Definition: vf_find_rect.c:38
AVFrame * needle_frame[MAX_MIPMAPS]
Definition: vf_find_rect.c:41
AVFrame * haystack_frame[MAX_MIPMAPS]
Definition: vf_find_rect.c:42
#define av_freep(p)
#define av_log(a,...)
#define src
Definition: vp8dsp.c:255
AVFormatContext * ctx
Definition: movenc.c:48
#define pass
Definition: tx_template.c:347
static float compare(const AVFrame *haystack, const AVFrame *obj, int offx, int offy)
Definition: vf_find_rect.c:104
static const AVFilterPad foc_outputs[]
Definition: vf_find_rect.c:285
#define MAX_MIPMAPS
Definition: vf_find_rect.c:31
static const AVFilterPad foc_inputs[]
Definition: vf_find_rect.c:275
static int query_formats(AVFilterContext *ctx)
Definition: vf_find_rect.c:60
AVFILTER_DEFINE_CLASS(find_rect)
static int config_input(AVFilterLink *inlink)
Definition: vf_find_rect.c:142
#define FLAGS
Definition: vf_find_rect.c:46
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
Definition: vf_find_rect.c:181
static av_cold int init(AVFilterContext *ctx)
Definition: vf_find_rect.c:241
static av_cold void uninit(AVFilterContext *ctx)
Definition: vf_find_rect.c:226
#define OFFSET(x)
Definition: vf_find_rect.c:45
AVFilter ff_vf_find_rect
Definition: vf_find_rect.c:293
static const AVOption find_rect_options[]
Definition: vf_find_rect.c:47
static float search(FOCContext *foc, int pass, int maxpass, int xmin, int xmax, int ymin, int ymax, int *best_x, int *best_y, float best_score)
Definition: vf_find_rect.c:155
static AVFrame * downscale(AVFrame *in)
Definition: vf_find_rect.c:71
static double c[64]