| 1 | /* |
| 2 | * Copyright (c) 2010 Bobby Bingham |
| 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 | /** |
| 22 | * @file |
| 23 | * aspect ratio modification video filters |
| 24 | */ |
| 25 | |
| 26 | #include <float.h> |
| 27 | |
| 28 | #include "libavutil/common.h" |
| 29 | #include "libavutil/eval.h" |
| 30 | #include "libavutil/mathematics.h" |
| 31 | #include "libavutil/opt.h" |
| 32 | #include "libavutil/parseutils.h" |
| 33 | #include "libavutil/pixdesc.h" |
| 34 | |
| 35 | #include "avfilter.h" |
| 36 | #include "internal.h" |
| 37 | #include "video.h" |
| 38 | |
| 39 | static const char *const var_names[] = { |
| 40 | "w", |
| 41 | "h", |
| 42 | "a", "dar", |
| 43 | "sar", |
| 44 | "hsub", |
| 45 | "vsub", |
| 46 | NULL |
| 47 | }; |
| 48 | |
| 49 | enum var_name { |
| 50 | VAR_W, |
| 51 | VAR_H, |
| 52 | VAR_A, VAR_DAR, |
| 53 | VAR_SAR, |
| 54 | VAR_HSUB, |
| 55 | VAR_VSUB, |
| 56 | VARS_NB |
| 57 | }; |
| 58 | |
| 59 | typedef struct AspectContext { |
| 60 | const AVClass *class; |
| 61 | AVRational dar; |
| 62 | AVRational sar; |
| 63 | int max; |
| 64 | #if FF_API_OLD_FILTER_OPTS |
| 65 | float aspect_den; |
| 66 | #endif |
| 67 | char *ratio_expr; |
| 68 | } AspectContext; |
| 69 | |
| 70 | static av_cold int init(AVFilterContext *ctx) |
| 71 | { |
| 72 | AspectContext *s = ctx->priv; |
| 73 | int ret; |
| 74 | |
| 75 | #if FF_API_OLD_FILTER_OPTS |
| 76 | if (s->ratio_expr && s->aspect_den > 0) { |
| 77 | double num; |
| 78 | av_log(ctx, AV_LOG_WARNING, |
| 79 | "num:den syntax is deprecated, please use num/den or named options instead\n"); |
| 80 | ret = av_expr_parse_and_eval(&num, s->ratio_expr, NULL, NULL, |
| 81 | NULL, NULL, NULL, NULL, NULL, 0, ctx); |
| 82 | if (ret < 0) { |
| 83 | av_log(ctx, AV_LOG_ERROR, "Unable to parse ratio numerator \"%s\"\n", s->ratio_expr); |
| 84 | return AVERROR(EINVAL); |
| 85 | } |
| 86 | s->sar = s->dar = av_d2q(num / s->aspect_den, s->max); |
| 87 | } |
| 88 | #endif |
| 89 | |
| 90 | return 0; |
| 91 | } |
| 92 | |
| 93 | static int filter_frame(AVFilterLink *link, AVFrame *frame) |
| 94 | { |
| 95 | AspectContext *s = link->dst->priv; |
| 96 | |
| 97 | frame->sample_aspect_ratio = s->sar; |
| 98 | return ff_filter_frame(link->dst->outputs[0], frame); |
| 99 | } |
| 100 | |
| 101 | #define OFFSET(x) offsetof(AspectContext, x) |
| 102 | #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM |
| 103 | |
| 104 | static inline void compute_dar(AVRational *dar, AVRational sar, int w, int h) |
| 105 | { |
| 106 | if (sar.num && sar.den) { |
| 107 | av_reduce(&dar->num, &dar->den, sar.num * w, sar.den * h, INT_MAX); |
| 108 | } else { |
| 109 | av_reduce(&dar->num, &dar->den, w, h, INT_MAX); |
| 110 | } |
| 111 | } |
| 112 | |
| 113 | static int get_aspect_ratio(AVFilterLink *inlink, AVRational *aspect_ratio) |
| 114 | { |
| 115 | AVFilterContext *ctx = inlink->dst; |
| 116 | AspectContext *s = inlink->dst->priv; |
| 117 | const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format); |
| 118 | double var_values[VARS_NB], res; |
| 119 | int ret; |
| 120 | |
| 121 | var_values[VAR_W] = inlink->w; |
| 122 | var_values[VAR_H] = inlink->h; |
| 123 | var_values[VAR_A] = (double) inlink->w / inlink->h; |
| 124 | var_values[VAR_SAR] = inlink->sample_aspect_ratio.num ? |
| 125 | (double) inlink->sample_aspect_ratio.num / inlink->sample_aspect_ratio.den : 1; |
| 126 | var_values[VAR_DAR] = var_values[VAR_A] * var_values[VAR_SAR]; |
| 127 | var_values[VAR_HSUB] = 1 << desc->log2_chroma_w; |
| 128 | var_values[VAR_VSUB] = 1 << desc->log2_chroma_h; |
| 129 | |
| 130 | /* evaluate new aspect ratio*/ |
| 131 | ret = av_expr_parse_and_eval(&res, s->ratio_expr, |
| 132 | var_names, var_values, |
| 133 | NULL, NULL, NULL, NULL, NULL, 0, ctx); |
| 134 | if (ret < 0) { |
| 135 | ret = av_parse_ratio(aspect_ratio, s->ratio_expr, s->max, 0, ctx); |
| 136 | } else |
| 137 | *aspect_ratio = av_d2q(res, s->max); |
| 138 | |
| 139 | if (ret < 0) { |
| 140 | av_log(ctx, AV_LOG_ERROR, |
| 141 | "Error when evaluating the expression '%s'\n", s->ratio_expr); |
| 142 | return ret; |
| 143 | } |
| 144 | if (aspect_ratio->num < 0 || aspect_ratio->den <= 0) { |
| 145 | av_log(ctx, AV_LOG_ERROR, |
| 146 | "Invalid string '%s' for aspect ratio\n", s->ratio_expr); |
| 147 | return AVERROR(EINVAL); |
| 148 | } |
| 149 | return 0; |
| 150 | } |
| 151 | |
| 152 | #if CONFIG_SETDAR_FILTER |
| 153 | |
| 154 | static int setdar_config_props(AVFilterLink *inlink) |
| 155 | { |
| 156 | AspectContext *s = inlink->dst->priv; |
| 157 | AVRational dar; |
| 158 | AVRational old_dar; |
| 159 | AVRational old_sar = inlink->sample_aspect_ratio; |
| 160 | int ret; |
| 161 | |
| 162 | #if FF_API_OLD_FILTER_OPTS |
| 163 | if (!(s->ratio_expr && s->aspect_den > 0)) { |
| 164 | #endif |
| 165 | if ((ret = get_aspect_ratio(inlink, &s->dar))) |
| 166 | return ret; |
| 167 | #if FF_API_OLD_FILTER_OPTS |
| 168 | } |
| 169 | #endif |
| 170 | |
| 171 | if (s->dar.num && s->dar.den) { |
| 172 | av_reduce(&s->sar.num, &s->sar.den, |
| 173 | s->dar.num * inlink->h, |
| 174 | s->dar.den * inlink->w, INT_MAX); |
| 175 | inlink->sample_aspect_ratio = s->sar; |
| 176 | dar = s->dar; |
| 177 | } else { |
| 178 | inlink->sample_aspect_ratio = (AVRational){ 1, 1 }; |
| 179 | dar = (AVRational){ inlink->w, inlink->h }; |
| 180 | } |
| 181 | |
| 182 | compute_dar(&old_dar, old_sar, inlink->w, inlink->h); |
| 183 | av_log(inlink->dst, AV_LOG_VERBOSE, "w:%d h:%d dar:%d/%d sar:%d/%d -> dar:%d/%d sar:%d/%d\n", |
| 184 | inlink->w, inlink->h, old_dar.num, old_dar.den, old_sar.num, old_sar.den, |
| 185 | dar.num, dar.den, inlink->sample_aspect_ratio.num, inlink->sample_aspect_ratio.den); |
| 186 | |
| 187 | return 0; |
| 188 | } |
| 189 | |
| 190 | static const AVOption setdar_options[] = { |
| 191 | { "dar", "set display aspect ratio", OFFSET(ratio_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS }, |
| 192 | { "ratio", "set display aspect ratio", OFFSET(ratio_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS }, |
| 193 | { "r", "set display aspect ratio", OFFSET(ratio_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS }, |
| 194 | #if FF_API_OLD_FILTER_OPTS |
| 195 | { "dar_den", NULL, OFFSET(aspect_den), AV_OPT_TYPE_FLOAT, { .dbl = 0 }, 0, FLT_MAX, FLAGS }, |
| 196 | #endif |
| 197 | { "max", "set max value for nominator or denominator in the ratio", OFFSET(max), AV_OPT_TYPE_INT, {.i64=100}, 1, INT_MAX, FLAGS }, |
| 198 | { NULL } |
| 199 | }; |
| 200 | |
| 201 | AVFILTER_DEFINE_CLASS(setdar); |
| 202 | |
| 203 | static const AVFilterPad avfilter_vf_setdar_inputs[] = { |
| 204 | { |
| 205 | .name = "default", |
| 206 | .type = AVMEDIA_TYPE_VIDEO, |
| 207 | .config_props = setdar_config_props, |
| 208 | .filter_frame = filter_frame, |
| 209 | }, |
| 210 | { NULL } |
| 211 | }; |
| 212 | |
| 213 | static const AVFilterPad avfilter_vf_setdar_outputs[] = { |
| 214 | { |
| 215 | .name = "default", |
| 216 | .type = AVMEDIA_TYPE_VIDEO, |
| 217 | }, |
| 218 | { NULL } |
| 219 | }; |
| 220 | |
| 221 | AVFilter ff_vf_setdar = { |
| 222 | .name = "setdar", |
| 223 | .description = NULL_IF_CONFIG_SMALL("Set the frame display aspect ratio."), |
| 224 | .init = init, |
| 225 | .priv_size = sizeof(AspectContext), |
| 226 | .priv_class = &setdar_class, |
| 227 | .inputs = avfilter_vf_setdar_inputs, |
| 228 | .outputs = avfilter_vf_setdar_outputs, |
| 229 | }; |
| 230 | |
| 231 | #endif /* CONFIG_SETDAR_FILTER */ |
| 232 | |
| 233 | #if CONFIG_SETSAR_FILTER |
| 234 | |
| 235 | static int setsar_config_props(AVFilterLink *inlink) |
| 236 | { |
| 237 | AspectContext *s = inlink->dst->priv; |
| 238 | AVRational old_sar = inlink->sample_aspect_ratio; |
| 239 | AVRational old_dar, dar; |
| 240 | int ret; |
| 241 | |
| 242 | #if FF_API_OLD_FILTER_OPTS |
| 243 | if (!(s->ratio_expr && s->aspect_den > 0)) { |
| 244 | #endif |
| 245 | if ((ret = get_aspect_ratio(inlink, &s->sar))) |
| 246 | return ret; |
| 247 | #if FF_API_OLD_FILTER_OPTS |
| 248 | } |
| 249 | #endif |
| 250 | |
| 251 | inlink->sample_aspect_ratio = s->sar; |
| 252 | |
| 253 | compute_dar(&old_dar, old_sar, inlink->w, inlink->h); |
| 254 | compute_dar(&dar, s->sar, inlink->w, inlink->h); |
| 255 | av_log(inlink->dst, AV_LOG_VERBOSE, "w:%d h:%d sar:%d/%d dar:%d/%d -> sar:%d/%d dar:%d/%d\n", |
| 256 | inlink->w, inlink->h, old_sar.num, old_sar.den, old_dar.num, old_dar.den, |
| 257 | inlink->sample_aspect_ratio.num, inlink->sample_aspect_ratio.den, dar.num, dar.den); |
| 258 | |
| 259 | return 0; |
| 260 | } |
| 261 | |
| 262 | static const AVOption setsar_options[] = { |
| 263 | { "sar", "set sample (pixel) aspect ratio", OFFSET(ratio_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS }, |
| 264 | { "ratio", "set sample (pixel) aspect ratio", OFFSET(ratio_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS }, |
| 265 | { "r", "set sample (pixel) aspect ratio", OFFSET(ratio_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS }, |
| 266 | #if FF_API_OLD_FILTER_OPTS |
| 267 | { "sar_den", NULL, OFFSET(aspect_den), AV_OPT_TYPE_FLOAT, { .dbl = 0 }, 0, FLT_MAX, FLAGS }, |
| 268 | #endif |
| 269 | { "max", "set max value for nominator or denominator in the ratio", OFFSET(max), AV_OPT_TYPE_INT, {.i64=100}, 1, INT_MAX, FLAGS }, |
| 270 | { NULL } |
| 271 | }; |
| 272 | |
| 273 | AVFILTER_DEFINE_CLASS(setsar); |
| 274 | |
| 275 | static const AVFilterPad avfilter_vf_setsar_inputs[] = { |
| 276 | { |
| 277 | .name = "default", |
| 278 | .type = AVMEDIA_TYPE_VIDEO, |
| 279 | .config_props = setsar_config_props, |
| 280 | .filter_frame = filter_frame, |
| 281 | }, |
| 282 | { NULL } |
| 283 | }; |
| 284 | |
| 285 | static const AVFilterPad avfilter_vf_setsar_outputs[] = { |
| 286 | { |
| 287 | .name = "default", |
| 288 | .type = AVMEDIA_TYPE_VIDEO, |
| 289 | }, |
| 290 | { NULL } |
| 291 | }; |
| 292 | |
| 293 | AVFilter ff_vf_setsar = { |
| 294 | .name = "setsar", |
| 295 | .description = NULL_IF_CONFIG_SMALL("Set the pixel sample aspect ratio."), |
| 296 | .init = init, |
| 297 | .priv_size = sizeof(AspectContext), |
| 298 | .priv_class = &setsar_class, |
| 299 | .inputs = avfilter_vf_setsar_inputs, |
| 300 | .outputs = avfilter_vf_setsar_outputs, |
| 301 | }; |
| 302 | |
| 303 | #endif /* CONFIG_SETSAR_FILTER */ |