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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/avassert.h"
26 #include "libavutil/imgutils.h"
27 #include "libavutil/opt.h"
28 #include "internal.h"
29 
30 #include "lavfutils.h"
31 
32 #define MAX_MIPMAPS 5
33 
34 typedef struct FOCContext {
35  AVClass *class;
36  float threshold;
37  int mipmaps;
38  int xmin, ymin, xmax, ymax;
39  char *obj_filename;
40  int last_x, last_y;
44 } FOCContext;
45 
46 #define OFFSET(x) offsetof(FOCContext, x)
47 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
48 static const AVOption find_rect_options[] = {
49  { "object", "object bitmap filename", OFFSET(obj_filename), AV_OPT_TYPE_STRING, {.str = NULL}, .flags = FLAGS },
50  { "threshold", "set threshold", OFFSET(threshold), AV_OPT_TYPE_FLOAT, {.dbl = 0.5}, 0, 1.0, FLAGS },
51  { "mipmaps", "set mipmaps", OFFSET(mipmaps), AV_OPT_TYPE_INT, {.i64 = 3}, 1, MAX_MIPMAPS, FLAGS },
52  { "xmin", "", OFFSET(xmin), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, FLAGS },
53  { "ymin", "", OFFSET(ymin), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, FLAGS },
54  { "xmax", "", OFFSET(xmax), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, FLAGS },
55  { "ymax", "", OFFSET(ymax), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, FLAGS },
56  { NULL }
57 };
58 
59 AVFILTER_DEFINE_CLASS(find_rect);
60 
62 {
63  static const enum AVPixelFormat pix_fmts[] = {
67  };
68 
69  return ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
70 }
71 
73 {
74  int x, y;
76  uint8_t *src, *dst;
77  if (!frame)
78  return NULL;
79 
80  frame->format = in->format;
81  frame->width = (in->width + 1) / 2;
82  frame->height = (in->height+ 1) / 2;
83 
84  if (av_frame_get_buffer(frame, 32) < 0) {
85  av_frame_free(&frame);
86  return NULL;
87  }
88  src = in ->data[0];
89  dst = frame->data[0];
90 
91  for(y = 0; y < frame->height; y++) {
92  for(x = 0; x < frame->width; x++) {
93  dst[x] = ( src[2*x+0]
94  + src[2*x+1]
95  + src[2*x+0 + in->linesize[0]]
96  + src[2*x+1 + in->linesize[0]]
97  + 2) >> 2;
98  }
99  src += 2*in->linesize[0];
100  dst += frame->linesize[0];
101  }
102  return frame;
103 }
104 
105 static float compare(const AVFrame *haystack, const AVFrame *obj, int offx, int offy)
106 {
107  int x,y;
108  int o_sum_v = 0;
109  int h_sum_v = 0;
110  int64_t oo_sum_v = 0;
111  int64_t hh_sum_v = 0;
112  int64_t oh_sum_v = 0;
113  float c;
114  int n = obj->height * obj->width;
115  const uint8_t *odat = obj ->data[0];
116  const uint8_t *hdat = haystack->data[0] + offx + offy * haystack->linesize[0];
117  int64_t o_sigma, h_sigma;
118 
119  for(y = 0; y < obj->height; y++) {
120  for(x = 0; x < obj->width; x++) {
121  int o_v = odat[x];
122  int h_v = hdat[x];
123  o_sum_v += o_v;
124  h_sum_v += h_v;
125  oo_sum_v += o_v * o_v;
126  hh_sum_v += h_v * h_v;
127  oh_sum_v += o_v * h_v;
128  }
129  odat += obj->linesize[0];
130  hdat += haystack->linesize[0];
131  }
132  o_sigma = n*oo_sum_v - o_sum_v*(int64_t)o_sum_v;
133  h_sigma = n*hh_sum_v - h_sum_v*(int64_t)h_sum_v;
134 
135  if (o_sigma == 0 || h_sigma == 0)
136  return 1.0;
137 
138  c = (n*oh_sum_v - o_sum_v*(int64_t)h_sum_v) / (sqrt(o_sigma)*sqrt(h_sigma));
139 
140  return 1 - fabs(c);
141 }
142 
143 static int config_input(AVFilterLink *inlink)
144 {
145  AVFilterContext *ctx = inlink->dst;
146  FOCContext *foc = ctx->priv;
147 
148  if (foc->xmax <= 0)
149  foc->xmax = inlink->w - foc->obj_frame->width;
150  if (foc->ymax <= 0)
151  foc->ymax = inlink->h - foc->obj_frame->height;
152 
153  return 0;
154 }
155 
156 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)
157 {
158  int x, y;
159 
160  if (pass + 1 <= maxpass) {
161  int sub_x, sub_y;
162  search(foc, pass+1, maxpass, xmin>>1, (xmax+1)>>1, ymin>>1, (ymax+1)>>1, &sub_x, &sub_y, 1.0);
163  xmin = FFMAX(xmin, 2*sub_x - 4);
164  xmax = FFMIN(xmax, 2*sub_x + 4);
165  ymin = FFMAX(ymin, 2*sub_y - 4);
166  ymax = FFMIN(ymax, 2*sub_y + 4);
167  }
168 
169  for (y = ymin; y <= ymax; y++) {
170  for (x = xmin; x <= xmax; x++) {
171  float score = compare(foc->haystack_frame[pass], foc->needle_frame[pass], x, y);
172  av_assert0(score != 0);
173  if (score < best_score) {
174  best_score = score;
175  *best_x = x;
176  *best_y = y;
177  }
178  }
179  }
180  return best_score;
181 }
182 
183 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
184 {
185  AVFilterContext *ctx = inlink->dst;
186  FOCContext *foc = ctx->priv;
187  float best_score;
188  int best_x, best_y;
189  int i;
190 
191  foc->haystack_frame[0] = av_frame_clone(in);
192  for (i=1; i<foc->mipmaps; i++) {
193  foc->haystack_frame[i] = downscale(foc->haystack_frame[i-1]);
194  }
195 
196  best_score = search(foc, 0, 0,
197  FFMAX(foc->xmin, foc->last_x - 8),
198  FFMIN(foc->xmax, foc->last_x + 8),
199  FFMAX(foc->ymin, foc->last_y - 8),
200  FFMIN(foc->ymax, foc->last_y + 8),
201  &best_x, &best_y, 1.0);
202 
203  best_score = search(foc, 0, foc->mipmaps - 1, foc->xmin, foc->xmax, foc->ymin, foc->ymax,
204  &best_x, &best_y, best_score);
205 
206  for (i=0; i<MAX_MIPMAPS; i++) {
207  av_frame_free(&foc->haystack_frame[i]);
208  }
209 
210  if (best_score > foc->threshold) {
211  return ff_filter_frame(ctx->outputs[0], in);
212  }
213 
214  av_log(ctx, AV_LOG_DEBUG, "Found at %d %d score %f\n", best_x, best_y, best_score);
215  foc->last_x = best_x;
216  foc->last_y = best_y;
217 
219 
220  av_dict_set_int(&in->metadata, "lavfi.rect.w", foc->obj_frame->width, 0);
221  av_dict_set_int(&in->metadata, "lavfi.rect.h", foc->obj_frame->height, 0);
222  av_dict_set_int(&in->metadata, "lavfi.rect.x", best_x, 0);
223  av_dict_set_int(&in->metadata, "lavfi.rect.y", best_y, 0);
224 
225  return ff_filter_frame(ctx->outputs[0], in);
226 }
227 
228 static av_cold void uninit(AVFilterContext *ctx)
229 {
230  FOCContext *foc = ctx->priv;
231  int i;
232 
233  for (i = 0; i < MAX_MIPMAPS; i++) {
234  av_frame_free(&foc->needle_frame[i]);
235  av_frame_free(&foc->haystack_frame[i]);
236  }
237 
238  if (foc->obj_frame)
239  av_freep(&foc->obj_frame->data[0]);
240  av_frame_free(&foc->obj_frame);
241 }
242 
243 static av_cold int init(AVFilterContext *ctx)
244 {
245  FOCContext *foc = ctx->priv;
246  int ret, i;
247 
248  if (!foc->obj_filename) {
249  av_log(ctx, AV_LOG_ERROR, "object filename not set\n");
250  return AVERROR(EINVAL);
251  }
252 
253  foc->obj_frame = av_frame_alloc();
254  if (!foc->obj_frame)
255  return AVERROR(ENOMEM);
256 
257  if ((ret = ff_load_image(foc->obj_frame->data, foc->obj_frame->linesize,
258  &foc->obj_frame->width, &foc->obj_frame->height,
259  &foc->obj_frame->format, foc->obj_filename, ctx)) < 0)
260  return ret;
261 
262  if (foc->obj_frame->format != AV_PIX_FMT_GRAY8) {
263  av_log(ctx, AV_LOG_ERROR, "object image is not a grayscale image\n");
264  return AVERROR(EINVAL);
265  }
266 
267  foc->needle_frame[0] = av_frame_clone(foc->obj_frame);
268  for (i = 1; i < foc->mipmaps; i++) {
269  foc->needle_frame[i] = downscale(foc->needle_frame[i-1]);
270  if (!foc->needle_frame[i])
271  return AVERROR(ENOMEM);
272  }
273 
274  return 0;
275 }
276 
277 static const AVFilterPad foc_inputs[] = {
278  {
279  .name = "default",
280  .type = AVMEDIA_TYPE_VIDEO,
281  .config_props = config_input,
282  .filter_frame = filter_frame,
283  },
284  { NULL }
285 };
286 
287 static const AVFilterPad foc_outputs[] = {
288  {
289  .name = "default",
290  .type = AVMEDIA_TYPE_VIDEO,
291  },
292  { NULL }
293 };
294 
296  .name = "find_rect",
297  .description = NULL_IF_CONFIG_SMALL("Find a user specified object"),
298  .priv_size = sizeof(FOCContext),
299  .init = init,
300  .uninit = uninit,
302  .inputs = foc_inputs,
303  .outputs = foc_outputs,
304  .priv_class = &find_rect_class,
305 };
static float compare(const AVFrame *haystack, const AVFrame *obj, int offx, int offy)
Definition: vf_find_rect.c:105
#define NULL
Definition: coverity.c:32
This structure describes decoded (raw) audio or video data.
Definition: frame.h:171
AVOption.
Definition: opt.h:255
misc image utilities
static const AVFilterPad outputs[]
Definition: af_ashowinfo.c:248
AVFilter ff_vf_find_rect
Definition: vf_find_rect.c:295
#define OFFSET(x)
Definition: vf_find_rect.c:46
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
Definition: vf_find_rect.c:183
AVFilterFormats * ff_make_format_list(const int *fmts)
Create a list of supported formats.
Definition: formats.c:283
const char * name
Pad name.
Definition: internal.h:69
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
Definition: avfilter.c:1158
uint8_t
#define av_cold
Definition: attributes.h:74
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:135
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:156
AVOptions.
#define FLAGS
Definition: vf_find_rect.c:47
static AVFrame * frame
AVFrame * obj_frame
Definition: vf_find_rect.c:41
static av_cold void uninit(AVFilterContext *ctx)
Definition: vf_find_rect.c:228
AVDictionary * metadata
metadata.
Definition: frame.h:543
static const AVFilterPad foc_outputs[]
Definition: vf_find_rect.c:287
static AVFrame * downscale(AVFrame *in)
Definition: vf_find_rect.c:72
#define MAX_MIPMAPS
Definition: vf_find_rect.c:32
#define av_log(a,...)
A filter pad used for either input or output.
Definition: internal.h:63
static const AVFilterPad foc_inputs[]
Definition: vf_find_rect.c:277
static const AVOption find_rect_options[]
Definition: vf_find_rect.c:48
int width
width and height of the video frame
Definition: frame.h:220
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
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:542
#define AVERROR(e)
Definition: error.h:43
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:148
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:175
void * priv
private data for use by the filter
Definition: avfilter.h:654
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:197
simple assert() macros that are a bit more flexible than ISO C assert().
#define FFMAX(a, b)
Definition: common.h:79
#define pass
Definition: fft_template.c:509
#define FFMIN(a, b)
Definition: common.h:81
float y
planar YUV 4:2:0, 12bpp, full scale (JPEG), deprecated in favor of AV_PIX_FMT_YUV420P and setting col...
Definition: pixfmt.h:75
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:24
int n
Definition: avisynth_c.h:547
AVFrame * av_frame_clone(const AVFrame *src)
Create a new frame that references the same data as src.
Definition: frame.c:451
int format
format of the frame, -1 if unknown or unset Values correspond to enum AVPixelFormat for video frames...
Definition: frame.h:232
AVS_Value src
Definition: avisynth_c.h:482
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:199
AVFrame * haystack_frame[MAX_MIPMAPS]
Definition: vf_find_rect.c:43
uint8_t pi<< 24) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0f/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S16, int16_t,(*(constint16_t *) pi >>8)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0f/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S32, int32_t,(*(constint32_t *) pi >>24)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0f/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_FLT, float, av_clip_uint8(lrintf(*(constfloat *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, float, av_clip_int16(lrintf(*(constfloat *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, float, av_clipl_int32(llrintf(*(constfloat *) pi *(1U<< 31)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_DBL, double, av_clip_uint8(lrint(*(constdouble *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, double, av_clip_int16(lrint(*(constdouble *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, double, av_clipl_int32(llrint(*(constdouble *) pi *(1U<< 31))))#defineSET_CONV_FUNC_GROUP(ofmt, ifmt) staticvoidset_generic_function(AudioConvert *ac){}voidff_audio_convert_free(AudioConvert **ac){if(!*ac) return;ff_dither_free(&(*ac) ->dc);av_freep(ac);}AudioConvert *ff_audio_convert_alloc(AVAudioResampleContext *avr, enumAVSampleFormatout_fmt, enumAVSampleFormatin_fmt, intchannels, intsample_rate, intapply_map){AudioConvert *ac;intin_planar, out_planar;ac=av_mallocz(sizeof(*ac));if(!ac) returnNULL;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);returnNULL;}returnac;}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;}elseif(in_planar) ac->func_type=CONV_FUNC_TYPE_INTERLEAVE;elseac->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);returnac;}intff_audio_convert(AudioConvert *ac, AudioData *out, AudioData *in){intuse_generic=1;intlen=in->nb_samples;intp;if(ac->dc){av_log(ac->avr, AV_LOG_TRACE,"%dsamples-audio_convert:%sto%s(dithered)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt));returnff_convert_dither(ac-> in
static av_cold int init(AVFilterContext *ctx)
Definition: vf_find_rect.c:243
Describe the class of an AVClass context structure.
Definition: log.h:67
AVFILTER_DEFINE_CLASS(find_rect)
Filter definition.
Definition: avfilter.h:470
static const AVFilterPad inputs[]
Definition: af_ashowinfo.c:239
const char * name
Filter name.
Definition: avfilter.h:474
AVFilterLink ** outputs
array of pointers to output links
Definition: avfilter.h:648
static enum AVPixelFormat pix_fmts[]
Definition: libkvazaar.c:209
int av_frame_get_buffer(AVFrame *frame, int align)
Allocate new buffer(s) for audio or video data.
Definition: frame.c:265
int av_frame_make_writable(AVFrame *frame)
Ensure that the frame data is writable, avoiding data copy if possible.
Definition: frame.c:510
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:182
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:63
Y , 8bpp.
Definition: pixfmt.h:71
float threshold
Definition: vf_find_rect.c:36
static double c[64]
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:143
static int config_input(AVFilterLink *inlink)
Definition: vf_find_rect.c:143
static int query_formats(AVFilterContext *ctx)
Definition: vf_find_rect.c:61
An instance of a filter.
Definition: avfilter.h:633
int height
Definition: frame.h:220
#define av_freep(p)
char * obj_filename
Definition: vf_find_rect.c:39
internal API functions
AVPixelFormat
Pixel format.
Definition: pixfmt.h:61
Miscellaneous utilities which make use of the libavformat library.
AVFrame * needle_frame[MAX_MIPMAPS]
Definition: vf_find_rect.c:42