FFmpeg coverage

Line	Branch	Exec	Source
1			/*
2			* Copyright (c) 2013 Clément Bœsch
3			*
4			* This file is part of FFmpeg.
5			*
6			* FFmpeg is free software; you can redistribute it and/or
7			* modify it under the terms of the GNU Lesser General Public
8			* License as published by the Free Software Foundation; either
9			* version 2.1 of the License, or (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 GNU
14			* Lesser General Public License for more details.
15			*
16			* You should have received a copy of the GNU Lesser General Public
17			* License along with FFmpeg; if not, write to the Free Software
18			* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19			*/
20
21			#include <float.h> /* DBL_MAX */
22
23			#include "libavutil/mem.h"
24			#include "libavutil/opt.h"
25			#include "libavutil/eval.h"
26			#include "libavutil/pixdesc.h"
27			#include "avfilter.h"
28			#include "internal.h"
29			#include "video.h"
30
31			static const char *const var_names[] = {
32			"w", // stream width
33			"h", // stream height
34			"n", // frame count
35			"pts", // presentation timestamp expressed in AV_TIME_BASE units
36			"r", // frame rate
37			"t", // timestamp expressed in seconds
38			"tb", // timebase
39			NULL
40			};
41
42			enum var_name {
43			VAR_W,
44			VAR_H,
45			VAR_N,
46			VAR_PTS,
47			VAR_R,
48			VAR_T,
49			VAR_TB,
50			VAR_NB
51			};
52
53			enum EvalMode {
54			EVAL_MODE_INIT,
55			EVAL_MODE_FRAME,
56			EVAL_MODE_NB
57			};
58
59			typedef struct VignetteContext {
60			const AVClass *class;
61			const AVPixFmtDescriptor *desc;
62			int backward;
63			int eval_mode; ///< EvalMode
64			#define DEF_EXPR_FIELDS(name) AVExpr *name##_pexpr; char *name##_expr; double name
65			DEF_EXPR_FIELDS(angle);
66			DEF_EXPR_FIELDS(x0);
67			DEF_EXPR_FIELDS(y0);
68			double var_values[VAR_NB];
69			float *fmap;
70			int fmap_linesize;
71			double dmax;
72			float xscale, yscale;
73			uint32_t dither;
74			int do_dither;
75			AVRational aspect;
76			AVRational scale;
77			} VignetteContext;
78
79			#define OFFSET(x) offsetof(VignetteContext, x)
80			#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
81			static const AVOption vignette_options[] = {
82			{ "angle", "set lens angle", OFFSET(angle_expr), AV_OPT_TYPE_STRING, {.str="PI/5"}, .flags = FLAGS },
83			{ "a", "set lens angle", OFFSET(angle_expr), AV_OPT_TYPE_STRING, {.str="PI/5"}, .flags = FLAGS },
84			{ "x0", "set circle center position on x-axis", OFFSET(x0_expr), AV_OPT_TYPE_STRING, {.str="w/2"}, .flags = FLAGS },
85			{ "y0", "set circle center position on y-axis", OFFSET(y0_expr), AV_OPT_TYPE_STRING, {.str="h/2"}, .flags = FLAGS },
86			{ "mode", "set forward/backward mode", OFFSET(backward), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, FLAGS, .unit = "mode" },
87			{ "forward", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 0}, INT_MIN, INT_MAX, FLAGS, .unit = "mode"},
88			{ "backward", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 1}, INT_MIN, INT_MAX, FLAGS, .unit = "mode"},
89			{ "eval", "specify when to evaluate expressions", OFFSET(eval_mode), AV_OPT_TYPE_INT, {.i64 = EVAL_MODE_INIT}, 0, EVAL_MODE_NB-1, FLAGS, .unit = "eval" },
90			{ "init", "eval expressions once during initialization", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_INIT}, .flags = FLAGS, .unit = "eval" },
91			{ "frame", "eval expressions for each frame", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_FRAME}, .flags = FLAGS, .unit = "eval" },
92			{ "dither", "set dithering", OFFSET(do_dither), AV_OPT_TYPE_BOOL, {.i64 = 1}, 0, 1, FLAGS },
93			{ "aspect", "set aspect ratio", OFFSET(aspect), AV_OPT_TYPE_RATIONAL, {.dbl = 1}, 0, DBL_MAX, .flags = FLAGS },
94			{ NULL }
95			};
96
97			AVFILTER_DEFINE_CLASS(vignette);
98
99		✗	static av_cold int init(AVFilterContext *ctx)
100			{
101		✗	VignetteContext *s = ctx->priv;
102
103			#define PARSE_EXPR(name) do { \
104			int ret = av_expr_parse(&s->name##_pexpr, s->name##_expr, var_names, \
105			NULL, NULL, NULL, NULL, 0, ctx); \
106			if (ret < 0) { \
107			av_log(ctx, AV_LOG_ERROR, "Unable to parse expression for '" \
108			AV_STRINGIFY(name) "'\n"); \
109			return ret; \
110			} \
111			} while (0)
112
113		✗	PARSE_EXPR(angle);
114		✗	PARSE_EXPR(x0);
115		✗	PARSE_EXPR(y0);
116		✗	return 0;
117			}
118
119		✗	static av_cold void uninit(AVFilterContext *ctx)
120			{
121		✗	VignetteContext *s = ctx->priv;
122		✗	av_freep(&s->fmap);
123		✗	av_expr_free(s->angle_pexpr);
124		✗	av_expr_free(s->x0_pexpr);
125		✗	av_expr_free(s->y0_pexpr);
126		✗	}
127
128			static const enum AVPixelFormat pix_fmts[] = {
129			AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P,
130			AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV411P,
131			AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV440P,
132			AV_PIX_FMT_RGB24, AV_PIX_FMT_BGR24,
133			AV_PIX_FMT_GRAY8,
134			AV_PIX_FMT_NONE
135			};
136
137		✗	static double get_natural_factor(const VignetteContext *s, int x, int y)
138			{
139		✗	const int xx = (x - s->x0) * s->xscale;
140		✗	const int yy = (y - s->y0) * s->yscale;
141		✗	const double dnorm = hypot(xx, yy) / s->dmax;
142		✗	if (dnorm > 1) {
143		✗	return 0;
144			} else {
145		✗	const double c = cos(s->angle * dnorm);
146		✗	return (c*c)*(c*c); // do not remove braces, it helps compilers
147			}
148			}
149
150		✗	static void update_context(VignetteContext *s, AVFilterLink *inlink, AVFrame *frame)
151			{
152			int x, y;
153		✗	float *dst = s->fmap;
154		✗	int dst_linesize = s->fmap_linesize;
155
156		✗	if (frame) {
157		✗	s->var_values[VAR_N] = inlink->frame_count_out;
158		✗	s->var_values[VAR_T] = TS2T(frame->pts, inlink->time_base);
159		✗	s->var_values[VAR_PTS] = TS2D(frame->pts);
160			} else {
161		✗	s->var_values[VAR_N] = NAN;
162		✗	s->var_values[VAR_T] = NAN;
163		✗	s->var_values[VAR_PTS] = NAN;
164			}
165
166		✗	s->angle = av_expr_eval(s->angle_pexpr, s->var_values, NULL);
167		✗	s->x0 = av_expr_eval(s->x0_pexpr, s->var_values, NULL);
168		✗	s->y0 = av_expr_eval(s->y0_pexpr, s->var_values, NULL);
169
170		✗	if (isnan(s->x0) || isnan(s->y0) || isnan(s->angle))
171		✗	s->eval_mode = EVAL_MODE_FRAME;
172
173		✗	s->angle = av_clipf(s->angle, 0, M_PI_2);
174
175		✗	if (s->backward) {
176		✗	for (y = 0; y < inlink->h; y++) {
177		✗	for (x = 0; x < inlink->w; x++)
178		✗	dst[x] = 1. / get_natural_factor(s, x, y);
179		✗	dst += dst_linesize;
180			}
181			} else {
182		✗	for (y = 0; y < inlink->h; y++) {
183		✗	for (x = 0; x < inlink->w; x++)
184		✗	dst[x] = get_natural_factor(s, x, y);
185		✗	dst += dst_linesize;
186			}
187			}
188		✗	}
189
190		✗	static inline double get_dither_value(VignetteContext *s)
191			{
192		✗	double dv = 0;
193		✗	if (s->do_dither) {
194		✗	dv = s->dither / (double)(1LL<<32);
195		✗	s->dither = s->dither * 1664525 + 1013904223;
196			}
197		✗	return dv;
198			}
199
200		✗	static int filter_frame(AVFilterLink *inlink, AVFrame *in)
201			{
202		✗	unsigned x, y, direct = 0;
203		✗	AVFilterContext *ctx = inlink->dst;
204		✗	VignetteContext *s = ctx->priv;
205		✗	AVFilterLink *outlink = ctx->outputs[0];
206			AVFrame *out;
207
208		✗	if (av_frame_is_writable(in)) {
209		✗	direct = 1;
210		✗	out = in;
211			} else {
212		✗	out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
213		✗	if (!out) {
214		✗	av_frame_free(&in);
215		✗	return AVERROR(ENOMEM);
216			}
217		✗	av_frame_copy_props(out, in);
218			}
219
220		✗	if (s->eval_mode == EVAL_MODE_FRAME)
221		✗	update_context(s, inlink, in);
222
223		✗	if (s->desc->flags & AV_PIX_FMT_FLAG_RGB) {
224		✗	uint8_t *dst = out->data[0];
225		✗	const uint8_t *src = in ->data[0];
226		✗	const float *fmap = s->fmap;
227		✗	const int dst_linesize = out->linesize[0];
228		✗	const int src_linesize = in ->linesize[0];
229		✗	const int fmap_linesize = s->fmap_linesize;
230
231		✗	for (y = 0; y < inlink->h; y++) {
232		✗	uint8_t *dstp = dst;
233		✗	const uint8_t *srcp = src;
234
235		✗	for (x = 0; x < inlink->w; x++, dstp += 3, srcp += 3) {
236		✗	const float f = fmap[x];
237
238		✗	dstp[0] = av_clip_uint8(srcp[0] * f + get_dither_value(s));
239		✗	dstp[1] = av_clip_uint8(srcp[1] * f + get_dither_value(s));
240		✗	dstp[2] = av_clip_uint8(srcp[2] * f + get_dither_value(s));
241			}
242		✗	dst += dst_linesize;
243		✗	src += src_linesize;
244		✗	fmap += fmap_linesize;
245			}
246			} else {
247			int plane;
248
249		✗	for (plane = 0; plane < 4 && in->data[plane] && in->linesize[plane]; plane++) {
250		✗	uint8_t *dst = out->data[plane];
251		✗	const uint8_t *src = in ->data[plane];
252		✗	const float *fmap = s->fmap;
253		✗	const int dst_linesize = out->linesize[plane];
254		✗	const int src_linesize = in ->linesize[plane];
255		✗	const int fmap_linesize = s->fmap_linesize;
256		✗	const int chroma = plane == 1 || plane == 2;
257		✗	const int hsub = chroma ? s->desc->log2_chroma_w : 0;
258		✗	const int vsub = chroma ? s->desc->log2_chroma_h : 0;
259		✗	const int w = AV_CEIL_RSHIFT(inlink->w, hsub);
260		✗	const int h = AV_CEIL_RSHIFT(inlink->h, vsub);
261
262		✗	for (y = 0; y < h; y++) {
263		✗	uint8_t *dstp = dst;
264		✗	const uint8_t *srcp = src;
265
266		✗	for (x = 0; x < w; x++) {
267		✗	const double dv = get_dither_value(s);
268		✗	if (chroma) *dstp++ = av_clip_uint8(fmap[x << hsub] * (*srcp++ - 127) + 127 + dv);
269		✗	else *dstp++ = av_clip_uint8(fmap[x ] * *srcp++ + dv);
270			}
271		✗	dst += dst_linesize;
272		✗	src += src_linesize;
273		✗	fmap += fmap_linesize << vsub;
274			}
275			}
276			}
277
278		✗	if (!direct)
279		✗	av_frame_free(&in);
280		✗	return ff_filter_frame(outlink, out);
281			}
282
283		✗	static int config_props(AVFilterLink *inlink)
284			{
285		✗	VignetteContext *s = inlink->dst->priv;
286		✗	AVRational sar = inlink->sample_aspect_ratio;
287
288		✗	s->desc = av_pix_fmt_desc_get(inlink->format);
289		✗	s->var_values[VAR_W] = inlink->w;
290		✗	s->var_values[VAR_H] = inlink->h;
291		✗	s->var_values[VAR_TB] = av_q2d(inlink->time_base);
292		✗	s->var_values[VAR_R] = inlink->frame_rate.num == 0 || inlink->frame_rate.den == 0 ?
293		✗	NAN : av_q2d(inlink->frame_rate);
294
295		✗	if (!sar.num || !sar.den)
296		✗	sar.num = sar.den = 1;
297		✗	if (sar.num > sar.den) {
298		✗	s->xscale = av_q2d(av_div_q(sar, s->aspect));
299		✗	s->yscale = 1;
300			} else {
301		✗	s->yscale = av_q2d(av_div_q(s->aspect, sar));
302		✗	s->xscale = 1;
303			}
304		✗	s->dmax = hypot(inlink->w / 2., inlink->h / 2.);
305		✗	av_log(s, AV_LOG_DEBUG, "xscale=%f yscale=%f dmax=%f\n",
306		✗	s->xscale, s->yscale, s->dmax);
307
308		✗	s->fmap_linesize = FFALIGN(inlink->w, 32);
309		✗	s->fmap = av_malloc_array(s->fmap_linesize, inlink->h * sizeof(*s->fmap));
310		✗	if (!s->fmap)
311		✗	return AVERROR(ENOMEM);
312
313		✗	if (s->eval_mode == EVAL_MODE_INIT)
314		✗	update_context(s, inlink, NULL);
315
316		✗	return 0;
317			}
318
319			static const AVFilterPad vignette_inputs[] = {
320			{
321			.name = "default",
322			.type = AVMEDIA_TYPE_VIDEO,
323			.filter_frame = filter_frame,
324			.config_props = config_props,
325			},
326			};
327
328			const AVFilter ff_vf_vignette = {
329			.name = "vignette",
330			.description = NULL_IF_CONFIG_SMALL("Make or reverse a vignette effect."),
331			.priv_size = sizeof(VignetteContext),
332			.init = init,
333			.uninit = uninit,
334			FILTER_INPUTS(vignette_inputs),
335			FILTER_OUTPUTS(ff_video_default_filterpad),
336			FILTER_PIXFMTS_ARRAY(pix_fmts),
337			.priv_class = &vignette_class,
338			.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
339			};
340