FFmpeg coverage

Line	Branch	Exec	Source
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/mem.h"
26			#include "libavutil/opt.h"
27			#include "internal.h"
28			#include "video.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;
41			AVFrame *obj_frame;
42			AVFrame *needle_frame[MAX_MIPMAPS];
43			AVFrame *haystack_frame[MAX_MIPMAPS];
44			int discard;
45			} FOCContext;
46
47			#define OFFSET(x) offsetof(FOCContext, x)
48			#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
49			static const AVOption find_rect_options[] = {
50			{ "object", "object bitmap filename", OFFSET(obj_filename), AV_OPT_TYPE_STRING, {.str = NULL}, .flags = FLAGS },
51			{ "threshold", "set threshold", OFFSET(threshold), AV_OPT_TYPE_FLOAT, {.dbl = 0.5}, 0, 1.0, FLAGS },
52			{ "mipmaps", "set mipmaps", OFFSET(mipmaps), AV_OPT_TYPE_INT, {.i64 = 3}, 1, MAX_MIPMAPS, FLAGS },
53			{ "xmin", "", OFFSET(xmin), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, FLAGS },
54			{ "ymin", "", OFFSET(ymin), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, FLAGS },
55			{ "xmax", "", OFFSET(xmax), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, FLAGS },
56			{ "ymax", "", OFFSET(ymax), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, FLAGS },
57			{ "discard", "", OFFSET(discard), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, FLAGS },
58			{ NULL }
59			};
60
61			AVFILTER_DEFINE_CLASS(find_rect);
62
63		✗	static AVFrame *downscale(AVFrame *in)
64			{
65			int x, y;
66		✗	AVFrame *frame = av_frame_alloc();
67			uint8_t *src, *dst;
68		✗	if (!frame)
69		✗	return NULL;
70
71		✗	frame->format = in->format;
72		✗	frame->width = (in->width + 1) / 2;
73		✗	frame->height = (in->height+ 1) / 2;
74
75		✗	if (av_frame_get_buffer(frame, 0) < 0) {
76		✗	av_frame_free(&frame);
77		✗	return NULL;
78			}
79		✗	src = in ->data[0];
80		✗	dst = frame->data[0];
81
82		✗	for(y = 0; y < frame->height; y++) {
83		✗	for(x = 0; x < frame->width; x++) {
84		✗	dst[x] = ( src[2*x+0]
85		✗	+ src[2*x+1]
86		✗	+ src[2*x+0 + in->linesize[0]]
87		✗	+ src[2*x+1 + in->linesize[0]]
88		✗	+ 2) >> 2;
89			}
90		✗	src += 2*in->linesize[0];
91		✗	dst += frame->linesize[0];
92			}
93		✗	return frame;
94			}
95
96		✗	static float compare(const AVFrame *haystack, const AVFrame *obj, int offx, int offy)
97			{
98			int x,y;
99		✗	int o_sum_v = 0;
100		✗	int h_sum_v = 0;
101		✗	int64_t oo_sum_v = 0;
102		✗	int64_t hh_sum_v = 0;
103		✗	int64_t oh_sum_v = 0;
104			float c;
105		✗	int n = obj->height * obj->width;
106		✗	const uint8_t *odat = obj ->data[0];
107		✗	const uint8_t *hdat = haystack->data[0] + offx + offy * haystack->linesize[0];
108			int64_t o_sigma, h_sigma;
109
110		✗	for(y = 0; y < obj->height; y++) {
111		✗	for(x = 0; x < obj->width; x++) {
112		✗	int o_v = odat[x];
113		✗	int h_v = hdat[x];
114		✗	o_sum_v += o_v;
115		✗	h_sum_v += h_v;
116		✗	oo_sum_v += o_v * o_v;
117		✗	hh_sum_v += h_v * h_v;
118		✗	oh_sum_v += o_v * h_v;
119			}
120		✗	odat += obj->linesize[0];
121		✗	hdat += haystack->linesize[0];
122			}
123		✗	o_sigma = n*oo_sum_v - o_sum_v*(int64_t)o_sum_v;
124		✗	h_sigma = n*hh_sum_v - h_sum_v*(int64_t)h_sum_v;
125
126		✗	if (o_sigma == 0 || h_sigma == 0)
127		✗	return 1.0;
128
129		✗	c = (n*oh_sum_v - o_sum_v*(int64_t)h_sum_v) / (sqrt(o_sigma)*sqrt(h_sigma));
130
131		✗	return 1 - fabs(c);
132			}
133
134		✗	static int config_input(AVFilterLink *inlink)
135			{
136		✗	AVFilterContext *ctx = inlink->dst;
137		✗	FOCContext *foc = ctx->priv;
138
139		✗	if (foc->xmax <= 0)
140		✗	foc->xmax = inlink->w - foc->obj_frame->width;
141		✗	if (foc->ymax <= 0)
142		✗	foc->ymax = inlink->h - foc->obj_frame->height;
143
144		✗	return 0;
145			}
146
147		✗	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)
148			{
149			int x, y;
150
151		✗	if (pass + 1 <= maxpass) {
152			int sub_x, sub_y;
153		✗	search(foc, pass+1, maxpass, xmin>>1, (xmax+1)>>1, ymin>>1, (ymax+1)>>1, &sub_x, &sub_y, 2.0);
154		✗	xmin = FFMAX(xmin, 2*sub_x - 4);
155		✗	xmax = FFMIN(xmax, 2*sub_x + 4);
156		✗	ymin = FFMAX(ymin, 2*sub_y - 4);
157		✗	ymax = FFMIN(ymax, 2*sub_y + 4);
158			}
159
160		✗	for (y = ymin; y <= ymax; y++) {
161		✗	for (x = xmin; x <= xmax; x++) {
162		✗	float score = compare(foc->haystack_frame[pass], foc->needle_frame[pass], x, y);
163		✗	if (score < best_score) {
164		✗	best_score = score;
165		✗	*best_x = x;
166		✗	*best_y = y;
167			}
168			}
169			}
170		✗	return best_score;
171			}
172
173		✗	static int filter_frame(AVFilterLink *inlink, AVFrame *in)
174			{
175		✗	AVFilterContext *ctx = inlink->dst;
176		✗	FOCContext *foc = ctx->priv;
177			float best_score;
178			int best_x, best_y;
179			int i;
180			char buf[32];
181
182		✗	foc->haystack_frame[0] = av_frame_clone(in);
183		✗	for (i=1; i<foc->mipmaps; i++) {
184		✗	foc->haystack_frame[i] = downscale(foc->haystack_frame[i-1]);
185			}
186
187		✗	best_score = search(foc, 0, 0,
188		✗	FFMAX(foc->xmin, foc->last_x - 8),
189		✗	FFMIN(foc->xmax, foc->last_x + 8),
190		✗	FFMAX(foc->ymin, foc->last_y - 8),
191		✗	FFMIN(foc->ymax, foc->last_y + 8),
192			&best_x, &best_y, 2.0);
193
194		✗	best_score = search(foc, 0, foc->mipmaps - 1, foc->xmin, foc->xmax, foc->ymin, foc->ymax,
195			&best_x, &best_y, best_score);
196
197		✗	for (i=0; i<MAX_MIPMAPS; i++) {
198		✗	av_frame_free(&foc->haystack_frame[i]);
199			}
200
201		✗	if (best_score > foc->threshold) {
202		✗	if (foc->discard) {
203		✗	av_frame_free(&in);
204		✗	return 0;
205			} else {
206		✗	return ff_filter_frame(ctx->outputs[0], in);
207			}
208			}
209
210		✗	av_log(ctx, AV_LOG_INFO, "Found at n=%"PRId64" pts_time=%f x=%d y=%d with score=%f\n",
211		✗	inlink->frame_count_out, TS2D(in->pts) * av_q2d(inlink->time_base),
212			best_x, best_y, best_score);
213		✗	foc->last_x = best_x;
214		✗	foc->last_y = best_y;
215
216		✗	snprintf(buf, sizeof(buf), "%f", best_score);
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		✗	av_dict_set(&in->metadata, "lavfi.rect.score", buf, 0);
223
224		✗	return ff_filter_frame(ctx->outputs[0], in);
225			}
226
227		✗	static av_cold void uninit(AVFilterContext *ctx)
228			{
229		✗	FOCContext *foc = ctx->priv;
230			int i;
231
232		✗	for (i = 0; i < MAX_MIPMAPS; i++) {
233		✗	av_frame_free(&foc->needle_frame[i]);
234		✗	av_frame_free(&foc->haystack_frame[i]);
235			}
236
237		✗	if (foc->obj_frame)
238		✗	av_freep(&foc->obj_frame->data[0]);
239		✗	av_frame_free(&foc->obj_frame);
240		✗	}
241
242		✗	static av_cold int init(AVFilterContext *ctx)
243			{
244		✗	FOCContext *foc = ctx->priv;
245			int ret, i;
246
247		✗	if (!foc->obj_filename) {
248		✗	av_log(ctx, AV_LOG_ERROR, "object filename not set\n");
249		✗	return AVERROR(EINVAL);
250			}
251
252		✗	foc->obj_frame = av_frame_alloc();
253		✗	if (!foc->obj_frame)
254		✗	return AVERROR(ENOMEM);
255
256		✗	if ((ret = ff_load_image(foc->obj_frame->data, foc->obj_frame->linesize,
257		✗	&foc->obj_frame->width, &foc->obj_frame->height,
258		✗	&foc->obj_frame->format, foc->obj_filename, ctx)) < 0)
259		✗	return ret;
260
261		✗	if (foc->obj_frame->format != AV_PIX_FMT_GRAY8) {
262		✗	av_log(ctx, AV_LOG_ERROR, "object image is not a grayscale image\n");
263		✗	return AVERROR(EINVAL);
264			}
265
266		✗	foc->needle_frame[0] = av_frame_clone(foc->obj_frame);
267		✗	for (i = 1; i < foc->mipmaps; i++) {
268		✗	foc->needle_frame[i] = downscale(foc->needle_frame[i-1]);
269		✗	if (!foc->needle_frame[i])
270		✗	return AVERROR(ENOMEM);
271			}
272
273		✗	return 0;
274			}
275
276			static const AVFilterPad foc_inputs[] = {
277			{
278			.name = "default",
279			.type = AVMEDIA_TYPE_VIDEO,
280			.config_props = config_input,
281			.filter_frame = filter_frame,
282			},
283			};
284
285			const AVFilter ff_vf_find_rect = {
286			.name = "find_rect",
287			.description = NULL_IF_CONFIG_SMALL("Find a user specified object."),
288			.priv_size = sizeof(FOCContext),
289			.init = init,
290			.uninit = uninit,
291			.flags = AVFILTER_FLAG_METADATA_ONLY,
292			FILTER_INPUTS(foc_inputs),
293			FILTER_OUTPUTS(ff_video_default_filterpad),
294			FILTER_PIXFMTS(AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUVJ420P),
295			.priv_class = &find_rect_class,
296			};
297