| 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 | |
| 35 | typedef 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 | |
| 45 | enum { 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 | |
| 50 | static 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 | |
| 68 | AVFILTER_DEFINE_CLASS(geq); |
| 69 | |
| 70 | static 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 |
| 95 | static double lum(void *priv, double x, double y) { return getpix(priv, x, y, 0); } |
| 96 | static double cb(void *priv, double x, double y) { return getpix(priv, x, y, 1); } |
| 97 | static double cr(void *priv, double x, double y) { return getpix(priv, x, y, 2); } |
| 98 | static double alpha(void *priv, double x, double y) { return getpix(priv, x, y, 3); } |
| 99 | |
| 100 | static const char *const var_names[] = { "X", "Y", "W", "H", "N", "SW", "SH", "T", NULL }; |
| 101 | enum { VAR_X, VAR_Y, VAR_W, VAR_H, VAR_N, VAR_SW, VAR_SH, VAR_T, VAR_VARS_NB }; |
| 102 | |
| 103 | static 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 | |
| 161 | end: |
| 162 | return ret; |
| 163 | } |
| 164 | |
| 165 | static 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 | |
| 186 | static 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 | |
| 197 | static 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 | |
| 242 | static 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 | |
| 251 | static 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 | |
| 261 | static const AVFilterPad geq_outputs[] = { |
| 262 | { |
| 263 | .name = "default", |
| 264 | .type = AVMEDIA_TYPE_VIDEO, |
| 265 | }, |
| 266 | { NULL } |
| 267 | }; |
| 268 | |
| 269 | AVFilter 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 | }; |