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|---|---|---|---|
| 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 "config_components.h" | ||
| 27 | |||
| 28 | #include <float.h> | ||
| 29 | |||
| 30 | #include "libavutil/common.h" | ||
| 31 | #include "libavutil/eval.h" | ||
| 32 | #include "libavutil/mathematics.h" | ||
| 33 | #include "libavutil/opt.h" | ||
| 34 | #include "libavutil/parseutils.h" | ||
| 35 | #include "libavutil/pixdesc.h" | ||
| 36 | |||
| 37 | #include "avfilter.h" | ||
| 38 | #include "filters.h" | ||
| 39 | #include "video.h" | ||
| 40 | |||
| 41 | static const char *const var_names[] = { | ||
| 42 | "w", | ||
| 43 | "h", | ||
| 44 | "a", | ||
| 45 | "dar", | ||
| 46 | "sar", | ||
| 47 | "hsub", | ||
| 48 | "vsub", | ||
| 49 | NULL | ||
| 50 | }; | ||
| 51 | |||
| 52 | enum var_name { | ||
| 53 | VAR_W, | ||
| 54 | VAR_H, | ||
| 55 | VAR_A, | ||
| 56 | VAR_DAR, | ||
| 57 | VAR_SAR, | ||
| 58 | VAR_HSUB, | ||
| 59 | VAR_VSUB, | ||
| 60 | VARS_NB | ||
| 61 | }; | ||
| 62 | |||
| 63 | typedef struct AspectContext { | ||
| 64 | const AVClass *class; | ||
| 65 | AVRational dar; | ||
| 66 | AVRational sar; | ||
| 67 | int max; | ||
| 68 | char *ratio_expr; | ||
| 69 | } AspectContext; | ||
| 70 | |||
| 71 | 115 | static int filter_frame(AVFilterLink *link, AVFrame *frame) | |
| 72 | { | ||
| 73 | 115 | AspectContext *s = link->dst->priv; | |
| 74 | |||
| 75 | 115 | frame->sample_aspect_ratio = s->sar; | |
| 76 | 115 | return ff_filter_frame(link->dst->outputs[0], frame); | |
| 77 | } | ||
| 78 | |||
| 79 | #define OFFSET(x) offsetof(AspectContext, x) | ||
| 80 | #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM | ||
| 81 | |||
| 82 | 9 | static inline void compute_dar(AVRational *dar, AVRational sar, int w, int h) | |
| 83 | { | ||
| 84 |
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9 | if (sar.num && sar.den) { |
| 85 | 3 | av_reduce(&dar->num, &dar->den, sar.num * (int64_t)w, sar.den * (int64_t)h, INT_MAX); | |
| 86 | } else { | ||
| 87 | 6 | av_reduce(&dar->num, &dar->den, w, h, INT_MAX); | |
| 88 | } | ||
| 89 | 9 | } | |
| 90 | |||
| 91 | 7 | static int get_aspect_ratio(AVFilterLink *inlink, AVRational *aspect_ratio) | |
| 92 | { | ||
| 93 | 7 | AVFilterContext *ctx = inlink->dst; | |
| 94 | 7 | AspectContext *s = inlink->dst->priv; | |
| 95 | 7 | const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format); | |
| 96 | double var_values[VARS_NB], res; | ||
| 97 | int ret; | ||
| 98 | |||
| 99 | 7 | var_values[VAR_W] = inlink->w; | |
| 100 | 7 | var_values[VAR_H] = inlink->h; | |
| 101 | 7 | var_values[VAR_A] = (double) inlink->w / inlink->h; | |
| 102 | 14 | var_values[VAR_SAR] = inlink->sample_aspect_ratio.num ? | |
| 103 |
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7 | (double) inlink->sample_aspect_ratio.num / inlink->sample_aspect_ratio.den : 1; |
| 104 | 7 | var_values[VAR_DAR] = var_values[VAR_A] * var_values[VAR_SAR]; | |
| 105 | 7 | var_values[VAR_HSUB] = 1 << desc->log2_chroma_w; | |
| 106 | 7 | var_values[VAR_VSUB] = 1 << desc->log2_chroma_h; | |
| 107 | |||
| 108 | /* evaluate new aspect ratio*/ | ||
| 109 | 7 | ret = av_expr_parse_and_eval(&res, s->ratio_expr, | |
| 110 | var_names, var_values, | ||
| 111 | NULL, NULL, NULL, NULL, NULL, 0, ctx); | ||
| 112 |
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7 | if (ret < 0) { |
| 113 | ✗ | ret = av_parse_ratio(aspect_ratio, s->ratio_expr, s->max, 0, ctx); | |
| 114 | } else | ||
| 115 | 7 | *aspect_ratio = av_d2q(res, s->max); | |
| 116 | |||
| 117 |
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7 | if (ret < 0) { |
| 118 | ✗ | av_log(ctx, AV_LOG_ERROR, | |
| 119 | "Error when evaluating the expression '%s'\n", s->ratio_expr); | ||
| 120 | ✗ | return ret; | |
| 121 | } | ||
| 122 |
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7 | if (aspect_ratio->num < 0 || aspect_ratio->den <= 0) { |
| 123 | ✗ | av_log(ctx, AV_LOG_ERROR, | |
| 124 | "Invalid string '%s' for aspect ratio\n", s->ratio_expr); | ||
| 125 | ✗ | return AVERROR(EINVAL); | |
| 126 | } | ||
| 127 | 7 | return 0; | |
| 128 | } | ||
| 129 | |||
| 130 | static const AVFilterPad aspect_inputs[] = { | ||
| 131 | { | ||
| 132 | .name = "default", | ||
| 133 | .type = AVMEDIA_TYPE_VIDEO, | ||
| 134 | .filter_frame = filter_frame, | ||
| 135 | }, | ||
| 136 | }; | ||
| 137 | |||
| 138 | #if CONFIG_SETDAR_FILTER | ||
| 139 | |||
| 140 | 5 | static int setdar_config_props(AVFilterLink *outlink) | |
| 141 | { | ||
| 142 | 5 | AVFilterContext *ctx = outlink->src; | |
| 143 | 5 | AVFilterLink *inlink = ctx->inputs[0]; | |
| 144 | 5 | AspectContext *s = ctx->priv; | |
| 145 | AVRational dar; | ||
| 146 | AVRational old_dar; | ||
| 147 | 5 | AVRational old_sar = inlink->sample_aspect_ratio; | |
| 148 | int ret; | ||
| 149 | |||
| 150 |
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5 | if ((ret = get_aspect_ratio(inlink, &s->dar))) |
| 151 | ✗ | return ret; | |
| 152 | |||
| 153 |
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5 | if (s->dar.num && s->dar.den) { |
| 154 | 5 | av_reduce(&s->sar.num, &s->sar.den, | |
| 155 | 5 | s->dar.num * inlink->h, | |
| 156 | 5 | s->dar.den * inlink->w, INT_MAX); | |
| 157 | 5 | outlink->sample_aspect_ratio = s->sar; | |
| 158 | 5 | dar = s->dar; | |
| 159 | } else { | ||
| 160 | ✗ | outlink->sample_aspect_ratio = (AVRational){ 1, 1 }; | |
| 161 | ✗ | dar = (AVRational){ inlink->w, inlink->h }; | |
| 162 | } | ||
| 163 | |||
| 164 | 5 | compute_dar(&old_dar, old_sar, inlink->w, inlink->h); | |
| 165 | 5 | av_log(ctx, AV_LOG_VERBOSE, "w:%d h:%d dar:%d/%d sar:%d/%d -> dar:%d/%d sar:%d/%d\n", | |
| 166 | inlink->w, inlink->h, old_dar.num, old_dar.den, old_sar.num, old_sar.den, | ||
| 167 | dar.num, dar.den, outlink->sample_aspect_ratio.num, outlink->sample_aspect_ratio.den); | ||
| 168 | |||
| 169 | 5 | return 0; | |
| 170 | } | ||
| 171 | |||
| 172 | static const AVOption setdar_options[] = { | ||
| 173 | { "dar", "set display aspect ratio", OFFSET(ratio_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS }, | ||
| 174 | { "ratio", "set display aspect ratio", OFFSET(ratio_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS }, | ||
| 175 | { "r", "set display aspect ratio", OFFSET(ratio_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS }, | ||
| 176 | { "max", "set max value for nominator or denominator in the ratio", OFFSET(max), AV_OPT_TYPE_INT, {.i64=100}, 1, INT_MAX, FLAGS }, | ||
| 177 | { NULL } | ||
| 178 | }; | ||
| 179 | |||
| 180 | AVFILTER_DEFINE_CLASS(setdar); | ||
| 181 | |||
| 182 | static const AVFilterPad avfilter_vf_setdar_outputs[] = { | ||
| 183 | { | ||
| 184 | .name = "default", | ||
| 185 | .type = AVMEDIA_TYPE_VIDEO, | ||
| 186 | .config_props = setdar_config_props, | ||
| 187 | }, | ||
| 188 | }; | ||
| 189 | |||
| 190 | const AVFilter ff_vf_setdar = { | ||
| 191 | .name = "setdar", | ||
| 192 | .description = NULL_IF_CONFIG_SMALL("Set the frame display aspect ratio."), | ||
| 193 | .priv_size = sizeof(AspectContext), | ||
| 194 | .priv_class = &setdar_class, | ||
| 195 | .flags = AVFILTER_FLAG_METADATA_ONLY, | ||
| 196 | FILTER_INPUTS(aspect_inputs), | ||
| 197 | FILTER_OUTPUTS(avfilter_vf_setdar_outputs), | ||
| 198 | }; | ||
| 199 | |||
| 200 | #endif /* CONFIG_SETDAR_FILTER */ | ||
| 201 | |||
| 202 | #if CONFIG_SETSAR_FILTER | ||
| 203 | |||
| 204 | 2 | static int setsar_config_props(AVFilterLink *outlink) | |
| 205 | { | ||
| 206 | 2 | AVFilterContext *ctx = outlink->src; | |
| 207 | 2 | AVFilterLink *inlink = ctx->inputs[0]; | |
| 208 | 2 | AspectContext *s = ctx->priv; | |
| 209 | 2 | AVRational old_sar = inlink->sample_aspect_ratio; | |
| 210 | AVRational old_dar, dar; | ||
| 211 | int ret; | ||
| 212 | |||
| 213 |
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2 | if ((ret = get_aspect_ratio(inlink, &s->sar))) |
| 214 | ✗ | return ret; | |
| 215 | |||
| 216 | 2 | outlink->sample_aspect_ratio = s->sar; | |
| 217 | |||
| 218 | 2 | compute_dar(&old_dar, old_sar, inlink->w, inlink->h); | |
| 219 | 2 | compute_dar(&dar, s->sar, inlink->w, inlink->h); | |
| 220 | 2 | av_log(ctx, AV_LOG_VERBOSE, "w:%d h:%d sar:%d/%d dar:%d/%d -> sar:%d/%d dar:%d/%d\n", | |
| 221 | inlink->w, inlink->h, old_sar.num, old_sar.den, old_dar.num, old_dar.den, | ||
| 222 | outlink->sample_aspect_ratio.num, outlink->sample_aspect_ratio.den, dar.num, dar.den); | ||
| 223 | |||
| 224 | 2 | return 0; | |
| 225 | } | ||
| 226 | |||
| 227 | static const AVOption setsar_options[] = { | ||
| 228 | { "sar", "set sample (pixel) aspect ratio", OFFSET(ratio_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS }, | ||
| 229 | { "ratio", "set sample (pixel) aspect ratio", OFFSET(ratio_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS }, | ||
| 230 | { "r", "set sample (pixel) aspect ratio", OFFSET(ratio_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS }, | ||
| 231 | { "max", "set max value for nominator or denominator in the ratio", OFFSET(max), AV_OPT_TYPE_INT, {.i64=100}, 1, INT_MAX, FLAGS }, | ||
| 232 | { NULL } | ||
| 233 | }; | ||
| 234 | |||
| 235 | AVFILTER_DEFINE_CLASS(setsar); | ||
| 236 | |||
| 237 | static const AVFilterPad avfilter_vf_setsar_outputs[] = { | ||
| 238 | { | ||
| 239 | .name = "default", | ||
| 240 | .type = AVMEDIA_TYPE_VIDEO, | ||
| 241 | .config_props = setsar_config_props, | ||
| 242 | }, | ||
| 243 | }; | ||
| 244 | |||
| 245 | const AVFilter ff_vf_setsar = { | ||
| 246 | .name = "setsar", | ||
| 247 | .description = NULL_IF_CONFIG_SMALL("Set the pixel sample aspect ratio."), | ||
| 248 | .priv_size = sizeof(AspectContext), | ||
| 249 | .priv_class = &setsar_class, | ||
| 250 | .flags = AVFILTER_FLAG_METADATA_ONLY, | ||
| 251 | FILTER_INPUTS(aspect_inputs), | ||
| 252 | FILTER_OUTPUTS(avfilter_vf_setsar_outputs), | ||
| 253 | }; | ||
| 254 | |||
| 255 | #endif /* CONFIG_SETSAR_FILTER */ | ||
| 256 |