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path: root/libavfilter/vf_geq.c (plain)
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1/*
2 * Copyright (C) 2006 Michael Niedermayer <michaelni@gmx.at>
3 * Copyright (C) 2012 Clément Bœsch <u pkh me>
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License along
18 * with FFmpeg; if not, write to the Free Software Foundation, Inc.,
19 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
20 */
21
22/**
23 * @file
24 * Generic equation change filter
25 * Originally written by Michael Niedermayer for the MPlayer project, and
26 * ported by Clément Bœsch for FFmpeg.
27 */
28
29#include "libavutil/avassert.h"
30#include "libavutil/avstring.h"
31#include "libavutil/eval.h"
32#include "libavutil/opt.h"
33#include "libavutil/pixdesc.h"
34#include "internal.h"
35
36typedef struct {
37 const AVClass *class;
38 AVExpr *e[4]; ///< expressions for each plane
39 char *expr_str[4+3]; ///< expression strings for each plane
40 AVFrame *picref; ///< current input buffer
41 int hsub, vsub; ///< chroma subsampling
42 int planes; ///< number of planes
43 int is_rgb;
44} GEQContext;
45
46enum { Y = 0, U, V, A, G, B, R };
47
48#define OFFSET(x) offsetof(GEQContext, x)
49#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
50
51static const AVOption geq_options[] = {
52 { "lum_expr", "set luminance expression", OFFSET(expr_str[Y]), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },
53 { "lum", "set luminance expression", OFFSET(expr_str[Y]), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },
54 { "cb_expr", "set chroma blue expression", OFFSET(expr_str[U]), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },
55 { "cb", "set chroma blue expression", OFFSET(expr_str[U]), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },
56 { "cr_expr", "set chroma red expression", OFFSET(expr_str[V]), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },
57 { "cr", "set chroma red expression", OFFSET(expr_str[V]), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },
58 { "alpha_expr", "set alpha expression", OFFSET(expr_str[A]), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },
59 { "a", "set alpha expression", OFFSET(expr_str[A]), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },
60 { "red_expr", "set red expression", OFFSET(expr_str[R]), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },
61 { "r", "set red expression", OFFSET(expr_str[R]), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },
62 { "green_expr", "set green expression", OFFSET(expr_str[G]), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },
63 { "g", "set green expression", OFFSET(expr_str[G]), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },
64 { "blue_expr", "set blue expression", OFFSET(expr_str[B]), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },
65 { "b", "set blue expression", OFFSET(expr_str[B]), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },
66 {NULL},
67};
68
69AVFILTER_DEFINE_CLASS(geq);
70
71static inline double getpix(void *priv, double x, double y, int plane)
72{
73 int xi, yi;
74 GEQContext *geq = priv;
75 AVFrame *picref = geq->picref;
76 const uint8_t *src = picref->data[plane];
77 const int linesize = picref->linesize[plane];
78 const int w = (plane == 1 || plane == 2) ? AV_CEIL_RSHIFT(picref->width, geq->hsub) : picref->width;
79 const int h = (plane == 1 || plane == 2) ? AV_CEIL_RSHIFT(picref->height, geq->vsub) : picref->height;
80
81 if (!src)
82 return 0;
83
84 xi = x = av_clipf(x, 0, w - 2);
85 yi = y = av_clipf(y, 0, h - 2);
86
87 x -= xi;
88 y -= yi;
89
90 return (1-y)*((1-x)*src[xi + yi * linesize] + x*src[xi + 1 + yi * linesize])
91 + y *((1-x)*src[xi + (yi+1) * linesize] + x*src[xi + 1 + (yi+1) * linesize]);
92}
93
94//TODO: cubic interpolate
95//TODO: keep the last few frames
96static double lum(void *priv, double x, double y) { return getpix(priv, x, y, 0); }
97static double cb(void *priv, double x, double y) { return getpix(priv, x, y, 1); }
98static double cr(void *priv, double x, double y) { return getpix(priv, x, y, 2); }
99static double alpha(void *priv, double x, double y) { return getpix(priv, x, y, 3); }
100
101static const char *const var_names[] = { "X", "Y", "W", "H", "N", "SW", "SH", "T", NULL };
102enum { VAR_X, VAR_Y, VAR_W, VAR_H, VAR_N, VAR_SW, VAR_SH, VAR_T, VAR_VARS_NB };
103
104static av_cold int geq_init(AVFilterContext *ctx)
105{
106 GEQContext *geq = ctx->priv;
107 int plane, ret = 0;
108
109 if (!geq->expr_str[Y] && !geq->expr_str[G] && !geq->expr_str[B] && !geq->expr_str[R]) {
110 av_log(ctx, AV_LOG_ERROR, "A luminance or RGB expression is mandatory\n");
111 ret = AVERROR(EINVAL);
112 goto end;
113 }
114 geq->is_rgb = !geq->expr_str[Y];
115
116 if ((geq->expr_str[Y] || geq->expr_str[U] || geq->expr_str[V]) && (geq->expr_str[G] || geq->expr_str[B] || geq->expr_str[R])) {
117 av_log(ctx, AV_LOG_ERROR, "Either YCbCr or RGB but not both must be specified\n");
118 ret = AVERROR(EINVAL);
119 goto end;
120 }
121
122 if (!geq->expr_str[U] && !geq->expr_str[V]) {
123 /* No chroma at all: fallback on luma */
124 geq->expr_str[U] = av_strdup(geq->expr_str[Y]);
125 geq->expr_str[V] = av_strdup(geq->expr_str[Y]);
126 } else {
127 /* One chroma unspecified, fallback on the other */
128 if (!geq->expr_str[U]) geq->expr_str[U] = av_strdup(geq->expr_str[V]);
129 if (!geq->expr_str[V]) geq->expr_str[V] = av_strdup(geq->expr_str[U]);
130 }
131
132 if (!geq->expr_str[A])
133 geq->expr_str[A] = av_strdup("255");
134 if (!geq->expr_str[G])
135 geq->expr_str[G] = av_strdup("g(X,Y)");
136 if (!geq->expr_str[B])
137 geq->expr_str[B] = av_strdup("b(X,Y)");
138 if (!geq->expr_str[R])
139 geq->expr_str[R] = av_strdup("r(X,Y)");
140
141 if (geq->is_rgb ?
142 (!geq->expr_str[G] || !geq->expr_str[B] || !geq->expr_str[R])
143 :
144 (!geq->expr_str[U] || !geq->expr_str[V] || !geq->expr_str[A])) {
145 ret = AVERROR(ENOMEM);
146 goto end;
147 }
148
149 for (plane = 0; plane < 4; plane++) {
150 static double (*p[])(void *, double, double) = { lum, cb, cr, alpha };
151 static const char *const func2_yuv_names[] = { "lum", "cb", "cr", "alpha", "p", NULL };
152 static const char *const func2_rgb_names[] = { "g", "b", "r", "alpha", "p", NULL };
153 const char *const *func2_names = geq->is_rgb ? func2_rgb_names : func2_yuv_names;
154 double (*func2[])(void *, double, double) = { lum, cb, cr, alpha, p[plane], NULL };
155
156 ret = av_expr_parse(&geq->e[plane], geq->expr_str[plane < 3 && geq->is_rgb ? plane+4 : plane], var_names,
157 NULL, NULL, func2_names, func2, 0, ctx);
158 if (ret < 0)
159 break;
160 }
161
162end:
163 return ret;
164}
165
166static int geq_query_formats(AVFilterContext *ctx)
167{
168 GEQContext *geq = ctx->priv;
169 static const enum AVPixelFormat yuv_pix_fmts[] = {
170 AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV420P,
171 AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV440P,
172 AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA420P,
173 AV_PIX_FMT_GRAY8,
174 AV_PIX_FMT_NONE
175 };
176 static const enum AVPixelFormat rgb_pix_fmts[] = {
177 AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRAP,
178 AV_PIX_FMT_NONE
179 };
180 AVFilterFormats *fmts_list;
181
182 if (geq->is_rgb) {
183 fmts_list = ff_make_format_list(rgb_pix_fmts);
184 } else
185 fmts_list = ff_make_format_list(yuv_pix_fmts);
186 if (!fmts_list)
187 return AVERROR(ENOMEM);
188 return ff_set_common_formats(ctx, fmts_list);
189}
190
191static int geq_config_props(AVFilterLink *inlink)
192{
193 GEQContext *geq = inlink->dst->priv;
194 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
195
196 av_assert0(desc);
197
198 geq->hsub = desc->log2_chroma_w;
199 geq->vsub = desc->log2_chroma_h;
200 geq->planes = desc->nb_components;
201 return 0;
202}
203
204static int geq_filter_frame(AVFilterLink *inlink, AVFrame *in)
205{
206 int plane;
207 GEQContext *geq = inlink->dst->priv;
208 AVFilterLink *outlink = inlink->dst->outputs[0];
209 AVFrame *out;
210 double values[VAR_VARS_NB] = {
211 [VAR_N] = inlink->frame_count_out,
212 [VAR_T] = in->pts == AV_NOPTS_VALUE ? NAN : in->pts * av_q2d(inlink->time_base),
213 };
214
215 geq->picref = in;
216 out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
217 if (!out) {
218 av_frame_free(&in);
219 return AVERROR(ENOMEM);
220 }
221 av_frame_copy_props(out, in);
222
223 for (plane = 0; plane < geq->planes && out->data[plane]; plane++) {
224 int x, y;
225 uint8_t *dst = out->data[plane];
226 const int linesize = out->linesize[plane];
227 const int w = (plane == 1 || plane == 2) ? AV_CEIL_RSHIFT(inlink->w, geq->hsub) : inlink->w;
228 const int h = (plane == 1 || plane == 2) ? AV_CEIL_RSHIFT(inlink->h, geq->vsub) : inlink->h;
229
230 values[VAR_W] = w;
231 values[VAR_H] = h;
232 values[VAR_SW] = w / (double)inlink->w;
233 values[VAR_SH] = h / (double)inlink->h;
234
235 for (y = 0; y < h; y++) {
236 values[VAR_Y] = y;
237 for (x = 0; x < w; x++) {
238 values[VAR_X] = x;
239 dst[x] = av_expr_eval(geq->e[plane], values, geq);
240 }
241 dst += linesize;
242 }
243 }
244
245 av_frame_free(&geq->picref);
246 return ff_filter_frame(outlink, out);
247}
248
249static av_cold void geq_uninit(AVFilterContext *ctx)
250{
251 int i;
252 GEQContext *geq = ctx->priv;
253
254 for (i = 0; i < FF_ARRAY_ELEMS(geq->e); i++)
255 av_expr_free(geq->e[i]);
256}
257
258static const AVFilterPad geq_inputs[] = {
259 {
260 .name = "default",
261 .type = AVMEDIA_TYPE_VIDEO,
262 .config_props = geq_config_props,
263 .filter_frame = geq_filter_frame,
264 },
265 { NULL }
266};
267
268static const AVFilterPad geq_outputs[] = {
269 {
270 .name = "default",
271 .type = AVMEDIA_TYPE_VIDEO,
272 },
273 { NULL }
274};
275
276AVFilter ff_vf_geq = {
277 .name = "geq",
278 .description = NULL_IF_CONFIG_SMALL("Apply generic equation to each pixel."),
279 .priv_size = sizeof(GEQContext),
280 .init = geq_init,
281 .uninit = geq_uninit,
282 .query_formats = geq_query_formats,
283 .inputs = geq_inputs,
284 .outputs = geq_outputs,
285 .priv_class = &geq_class,
286 .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
287};
288
generated by cgit at 2024-05-17 06:58:05 (GMT)