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Imported Debian version 2.4.3~trusty1
[deb_ffmpeg.git] / ffmpeg / libavfilter / vf_geq.c
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2ba45a60
DM		 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/avstring.h"
30#include "libavutil/eval.h"
31#include "libavutil/opt.h"
32#include "libavutil/pixdesc.h"
33#include "internal.h"
34
35typedef struct {
36 const AVClass *class;
37 AVExpr *e[4]; ///< expressions for each plane
38 char *expr_str[4+3]; ///< expression strings for each plane
39 AVFrame *picref; ///< current input buffer
40 int hsub, vsub; ///< chroma subsampling
41 int planes; ///< number of planes
42 int is_rgb;
43} GEQContext;
44
45enum { Y = 0, U, V, A, G, B, R };
46
47#define OFFSET(x) offsetof(GEQContext, x)
48#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
49
50static const AVOption geq_options[] = {
51 { "lum_expr", "set luminance expression", OFFSET(expr_str[Y]), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },
52 { "lum", "set luminance expression", OFFSET(expr_str[Y]), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },
53 { "cb_expr", "set chroma blue expression", OFFSET(expr_str[U]), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },
54 { "cb", "set chroma blue expression", OFFSET(expr_str[U]), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },
55 { "cr_expr", "set chroma red expression", OFFSET(expr_str[V]), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },
56 { "cr", "set chroma red expression", OFFSET(expr_str[V]), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },
57 { "alpha_expr", "set alpha expression", OFFSET(expr_str[A]), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },
58 { "a", "set alpha expression", OFFSET(expr_str[A]), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },
59 { "red_expr", "set red expression", OFFSET(expr_str[R]), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },
60 { "r", "set red expression", OFFSET(expr_str[R]), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },
61 { "green_expr", "set green expression", OFFSET(expr_str[G]), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },
62 { "g", "set green expression", OFFSET(expr_str[G]), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },
63 { "blue_expr", "set blue expression", OFFSET(expr_str[B]), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },
64 { "b", "set blue expression", OFFSET(expr_str[B]), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS },
65 {NULL},
66};
67
68AVFILTER_DEFINE_CLASS(geq);
69
70static inline double getpix(void *priv, double x, double y, int plane)
71{
72 int xi, yi;
73 GEQContext *geq = priv;
74 AVFrame *picref = geq->picref;
75 const uint8_t *src = picref->data[plane];
76 const int linesize = picref->linesize[plane];
77 const int w = (plane == 1 || plane == 2) ? FF_CEIL_RSHIFT(picref->width, geq->hsub) : picref->width;
78 const int h = (plane == 1 || plane == 2) ? FF_CEIL_RSHIFT(picref->height, geq->vsub) : picref->height;
79
80 if (!src)
81 return 0;
82
83 xi = x = av_clipf(x, 0, w - 2);
84 yi = y = av_clipf(y, 0, h - 2);
85
86 x -= xi;
87 y -= yi;
88
89 return (1-y)*((1-x)*src[xi + yi * linesize] + x*src[xi + 1 + yi * linesize])
90 + y *((1-x)*src[xi + (yi+1) * linesize] + x*src[xi + 1 + (yi+1) * linesize]);
91}
92
93//TODO: cubic interpolate
94//TODO: keep the last few frames
95static double lum(void *priv, double x, double y) { return getpix(priv, x, y, 0); }
96static double cb(void *priv, double x, double y) { return getpix(priv, x, y, 1); }
97static double cr(void *priv, double x, double y) { return getpix(priv, x, y, 2); }
98static double alpha(void *priv, double x, double y) { return getpix(priv, x, y, 3); }
99
100static const char *const var_names[] = { "X", "Y", "W", "H", "N", "SW", "SH", "T", NULL };
101enum { VAR_X, VAR_Y, VAR_W, VAR_H, VAR_N, VAR_SW, VAR_SH, VAR_T, VAR_VARS_NB };
102
103static av_cold int geq_init(AVFilterContext *ctx)
104{
105 GEQContext *geq = ctx->priv;
106 int plane, ret = 0;
107
108 if (!geq->expr_str[Y] && !geq->expr_str[G] && !geq->expr_str[B] && !geq->expr_str[R]) {
109 av_log(ctx, AV_LOG_ERROR, "A luminance or RGB expression is mandatory\n");
110 ret = AVERROR(EINVAL);
111 goto end;
112 }
113 geq->is_rgb = !geq->expr_str[Y];
114
115 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])) {
116 av_log(ctx, AV_LOG_ERROR, "Either YCbCr or RGB but not both must be specified\n");
117 ret = AVERROR(EINVAL);
118 goto end;
119 }
120
121 if (!geq->expr_str[U] && !geq->expr_str[V]) {
122 /* No chroma at all: fallback on luma */
123 geq->expr_str[U] = av_strdup(geq->expr_str[Y]);
124 geq->expr_str[V] = av_strdup(geq->expr_str[Y]);
125 } else {
126 /* One chroma unspecified, fallback on the other */
127 if (!geq->expr_str[U]) geq->expr_str[U] = av_strdup(geq->expr_str[V]);
128 if (!geq->expr_str[V]) geq->expr_str[V] = av_strdup(geq->expr_str[U]);
129 }
130
131 if (!geq->expr_str[A])
132 geq->expr_str[A] = av_strdup("255");
133 if (!geq->expr_str[G])
134 geq->expr_str[G] = av_strdup("g(X,Y)");
135 if (!geq->expr_str[B])
136 geq->expr_str[B] = av_strdup("b(X,Y)");
137 if (!geq->expr_str[R])
138 geq->expr_str[R] = av_strdup("r(X,Y)");
139
140 if (geq->is_rgb ?
141 (!geq->expr_str[G] || !geq->expr_str[B] || !geq->expr_str[R])
142 :
143 (!geq->expr_str[U] || !geq->expr_str[V] || !geq->expr_str[A])) {
144 ret = AVERROR(ENOMEM);
145 goto end;
146 }
147
148 for (plane = 0; plane < 4; plane++) {
149 static double (*p[])(void *, double, double) = { lum, cb, cr, alpha };
150 static const char *const func2_yuv_names[] = { "lum", "cb", "cr", "alpha", "p", NULL };
151 static const char *const func2_rgb_names[] = { "g", "b", "r", "alpha", "p", NULL };
152 const char *const *func2_names = geq->is_rgb ? func2_rgb_names : func2_yuv_names;
153 double (*func2[])(void *, double, double) = { lum, cb, cr, alpha, p[plane], NULL };
154
155 ret = av_expr_parse(&geq->e[plane], geq->expr_str[plane < 3 && geq->is_rgb ? plane+4 : plane], var_names,
156 NULL, NULL, func2_names, func2, 0, ctx);
157 if (ret < 0)
158 break;
159 }
160
161end:
162 return ret;
163}
164
165static int geq_query_formats(AVFilterContext *ctx)
166{
167 GEQContext *geq = ctx->priv;
168 static const enum PixelFormat yuv_pix_fmts[] = {
169 AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV420P,
170 AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV440P,
171 AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA420P,
172 AV_PIX_FMT_GRAY8,
173 AV_PIX_FMT_NONE
174 };
175 static const enum PixelFormat rgb_pix_fmts[] = {
176 AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRAP,
177 AV_PIX_FMT_NONE
178 };
179 if (geq->is_rgb) {
180 ff_set_common_formats(ctx, ff_make_format_list(rgb_pix_fmts));
181 } else
182 ff_set_common_formats(ctx, ff_make_format_list(yuv_pix_fmts));
183 return 0;
184}
185
186static int geq_config_props(AVFilterLink *inlink)
187{
188 GEQContext *geq = inlink->dst->priv;
189 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
190
191 geq->hsub = desc->log2_chroma_w;
192 geq->vsub = desc->log2_chroma_h;
193 geq->planes = desc->nb_components;
194 return 0;
195}
196
197static int geq_filter_frame(AVFilterLink *inlink, AVFrame *in)
198{
199 int plane;
200 GEQContext *geq = inlink->dst->priv;
201 AVFilterLink *outlink = inlink->dst->outputs[0];
202 AVFrame *out;
203 double values[VAR_VARS_NB] = {
204 [VAR_N] = inlink->frame_count,
205 [VAR_T] = in->pts == AV_NOPTS_VALUE ? NAN : in->pts * av_q2d(inlink->time_base),
206 };
207
208 geq->picref = in;
209 out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
210 if (!out) {
211 av_frame_free(&in);
212 return AVERROR(ENOMEM);
213 }
214 av_frame_copy_props(out, in);
215
216 for (plane = 0; plane < geq->planes && out->data[plane]; plane++) {
217 int x, y;
218 uint8_t *dst = out->data[plane];
219 const int linesize = out->linesize[plane];
220 const int w = (plane == 1 || plane == 2) ? FF_CEIL_RSHIFT(inlink->w, geq->hsub) : inlink->w;
221 const int h = (plane == 1 || plane == 2) ? FF_CEIL_RSHIFT(inlink->h, geq->vsub) : inlink->h;
222
223 values[VAR_W] = w;
224 values[VAR_H] = h;
225 values[VAR_SW] = w / (double)inlink->w;
226 values[VAR_SH] = h / (double)inlink->h;
227
228 for (y = 0; y < h; y++) {
229 values[VAR_Y] = y;
230 for (x = 0; x < w; x++) {
231 values[VAR_X] = x;
232 dst[x] = av_expr_eval(geq->e[plane], values, geq);
233 }
234 dst += linesize;
235 }
236 }
237
238 av_frame_free(&geq->picref);
239 return ff_filter_frame(outlink, out);
240}
241
242static av_cold void geq_uninit(AVFilterContext *ctx)
243{
244 int i;
245 GEQContext *geq = ctx->priv;
246
247 for (i = 0; i < FF_ARRAY_ELEMS(geq->e); i++)
248 av_expr_free(geq->e[i]);
249}
250
251static const AVFilterPad geq_inputs[] = {
252 {
253 .name = "default",
254 .type = AVMEDIA_TYPE_VIDEO,
255 .config_props = geq_config_props,
256 .filter_frame = geq_filter_frame,
257 },
258 { NULL }
259};
260
261static const AVFilterPad geq_outputs[] = {
262 {
263 .name = "default",
264 .type = AVMEDIA_TYPE_VIDEO,
265 },
266 { NULL }
267};
268
269AVFilter ff_vf_geq = {
270 .name = "geq",
271 .description = NULL_IF_CONFIG_SMALL("Apply generic equation to each pixel."),
272 .priv_size = sizeof(GEQContext),
273 .init = geq_init,
274 .uninit = geq_uninit,
275 .query_formats = geq_query_formats,
276 .inputs = geq_inputs,
277 .outputs = geq_outputs,
278 .priv_class = &geq_class,
279 .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
280};
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