/* * Copyright (c) 2010 Bobby Bingham * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * @file * aspect ratio modification video filters */ #include <float.h> #include "libavutil/common.h" #include "libavutil/eval.h" #include "libavutil/mathematics.h" #include "libavutil/opt.h" #include "libavutil/parseutils.h" #include "libavutil/pixdesc.h" #include "avfilter.h" #include "internal.h" #include "video.h" static const char *const var_names[] = { "w", "h", "a", "dar", "sar", "hsub", "vsub", NULL }; enum var_name { VAR_W, VAR_H, VAR_A, VAR_DAR, VAR_SAR, VAR_HSUB, VAR_VSUB, VARS_NB }; typedef struct AspectContext { const AVClass *class; AVRational dar; AVRational sar; int max; #if FF_API_OLD_FILTER_OPTS float aspect_den; #endif char *ratio_expr; } AspectContext; static av_cold int init(AVFilterContext *ctx) { #if FF_API_OLD_FILTER_OPTS AspectContext *s = ctx->priv; int ret; if (s->ratio_expr && s->aspect_den > 0) { double num; av_log(ctx, AV_LOG_WARNING, "num:den syntax is deprecated, please use num/den or named options instead\n"); ret = av_expr_parse_and_eval(&num, s->ratio_expr, NULL, NULL, NULL, NULL, NULL, NULL, NULL, 0, ctx); if (ret < 0) { av_log(ctx, AV_LOG_ERROR, "Unable to parse ratio numerator \"%s\"\n", s->ratio_expr); return AVERROR(EINVAL); } s->sar = s->dar = av_d2q(num / s->aspect_den, s->max); } #endif return 0; } static int filter_frame(AVFilterLink *link, AVFrame *frame) { AspectContext *s = link->dst->priv; frame->sample_aspect_ratio = s->sar; return ff_filter_frame(link->dst->outputs[0], frame); } #define OFFSET(x) offsetof(AspectContext, x) #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM static inline void compute_dar(AVRational *dar, AVRational sar, int w, int h) { if (sar.num && sar.den) { av_reduce(&dar->num, &dar->den, sar.num * w, sar.den * h, INT_MAX); } else { av_reduce(&dar->num, &dar->den, w, h, INT_MAX); } } static int get_aspect_ratio(AVFilterLink *inlink, AVRational *aspect_ratio) { AVFilterContext *ctx = inlink->dst; AspectContext *s = inlink->dst->priv; const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format); double var_values[VARS_NB], res; int ret; var_values[VAR_W] = inlink->w; var_values[VAR_H] = inlink->h; var_values[VAR_A] = (double) inlink->w / inlink->h; var_values[VAR_SAR] = inlink->sample_aspect_ratio.num ? (double) inlink->sample_aspect_ratio.num / inlink->sample_aspect_ratio.den : 1; var_values[VAR_DAR] = var_values[VAR_A] * var_values[VAR_SAR]; var_values[VAR_HSUB] = 1 << desc->log2_chroma_w; var_values[VAR_VSUB] = 1 << desc->log2_chroma_h; /* evaluate new aspect ratio*/ ret = av_expr_parse_and_eval(&res, s->ratio_expr, var_names, var_values, NULL, NULL, NULL, NULL, NULL, 0, ctx); if (ret < 0) { ret = av_parse_ratio(aspect_ratio, s->ratio_expr, s->max, 0, ctx); } else *aspect_ratio = av_d2q(res, s->max); if (ret < 0) { av_log(ctx, AV_LOG_ERROR, "Error when evaluating the expression '%s'\n", s->ratio_expr); return ret; } if (aspect_ratio->num < 0 || aspect_ratio->den <= 0) { av_log(ctx, AV_LOG_ERROR, "Invalid string '%s' for aspect ratio\n", s->ratio_expr); return AVERROR(EINVAL); } return 0; } #if CONFIG_SETDAR_FILTER static int setdar_config_props(AVFilterLink *inlink) { AspectContext *s = inlink->dst->priv; AVRational dar; AVRational old_dar; AVRational old_sar = inlink->sample_aspect_ratio; int ret; #if FF_API_OLD_FILTER_OPTS if (!(s->ratio_expr && s->aspect_den > 0)) { #endif if ((ret = get_aspect_ratio(inlink, &s->dar))) return ret; #if FF_API_OLD_FILTER_OPTS } #endif if (s->dar.num && s->dar.den) { av_reduce(&s->sar.num, &s->sar.den, s->dar.num * inlink->h, s->dar.den * inlink->w, INT_MAX); inlink->sample_aspect_ratio = s->sar; dar = s->dar; } else { inlink->sample_aspect_ratio = (AVRational){ 1, 1 }; dar = (AVRational){ inlink->w, inlink->h }; } compute_dar(&old_dar, old_sar, inlink->w, inlink->h); av_log(inlink->dst, AV_LOG_VERBOSE, "w:%d h:%d dar:%d/%d sar:%d/%d -> dar:%d/%d sar:%d/%d\n", inlink->w, inlink->h, old_dar.num, old_dar.den, old_sar.num, old_sar.den, dar.num, dar.den, inlink->sample_aspect_ratio.num, inlink->sample_aspect_ratio.den); return 0; } static const AVOption setdar_options[] = { { "dar", "set display aspect ratio", OFFSET(ratio_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS }, { "ratio", "set display aspect ratio", OFFSET(ratio_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS }, { "r", "set display aspect ratio", OFFSET(ratio_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS }, #if FF_API_OLD_FILTER_OPTS { "dar_den", NULL, OFFSET(aspect_den), AV_OPT_TYPE_FLOAT, { .dbl = 0 }, 0, FLT_MAX, FLAGS }, #endif { "max", "set max value for nominator or denominator in the ratio", OFFSET(max), AV_OPT_TYPE_INT, {.i64=100}, 1, INT_MAX, FLAGS }, { NULL } }; AVFILTER_DEFINE_CLASS(setdar); static const AVFilterPad avfilter_vf_setdar_inputs[] = { { .name = "default", .type = AVMEDIA_TYPE_VIDEO, .config_props = setdar_config_props, .filter_frame = filter_frame, }, { NULL } }; static const AVFilterPad avfilter_vf_setdar_outputs[] = { { .name = "default", .type = AVMEDIA_TYPE_VIDEO, }, { NULL } }; AVFilter ff_vf_setdar = { .name = "setdar", .description = NULL_IF_CONFIG_SMALL("Set the frame display aspect ratio."), .init = init, .priv_size = sizeof(AspectContext), .priv_class = &setdar_class, .inputs = avfilter_vf_setdar_inputs, .outputs = avfilter_vf_setdar_outputs, }; #endif /* CONFIG_SETDAR_FILTER */ #if CONFIG_SETSAR_FILTER static int setsar_config_props(AVFilterLink *inlink) { AspectContext *s = inlink->dst->priv; AVRational old_sar = inlink->sample_aspect_ratio; AVRational old_dar, dar; int ret; #if FF_API_OLD_FILTER_OPTS if (!(s->ratio_expr && s->aspect_den > 0)) { #endif if ((ret = get_aspect_ratio(inlink, &s->sar))) return ret; #if FF_API_OLD_FILTER_OPTS } #endif inlink->sample_aspect_ratio = s->sar; compute_dar(&old_dar, old_sar, inlink->w, inlink->h); compute_dar(&dar, s->sar, inlink->w, inlink->h); av_log(inlink->dst, AV_LOG_VERBOSE, "w:%d h:%d sar:%d/%d dar:%d/%d -> sar:%d/%d dar:%d/%d\n", inlink->w, inlink->h, old_sar.num, old_sar.den, old_dar.num, old_dar.den, inlink->sample_aspect_ratio.num, inlink->sample_aspect_ratio.den, dar.num, dar.den); return 0; } static const AVOption setsar_options[] = { { "sar", "set sample (pixel) aspect ratio", OFFSET(ratio_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS }, { "ratio", "set sample (pixel) aspect ratio", OFFSET(ratio_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS }, { "r", "set sample (pixel) aspect ratio", OFFSET(ratio_expr), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS }, #if FF_API_OLD_FILTER_OPTS { "sar_den", NULL, OFFSET(aspect_den), AV_OPT_TYPE_FLOAT, { .dbl = 0 }, 0, FLT_MAX, FLAGS }, #endif { "max", "set max value for nominator or denominator in the ratio", OFFSET(max), AV_OPT_TYPE_INT, {.i64=100}, 1, INT_MAX, FLAGS }, { NULL } }; AVFILTER_DEFINE_CLASS(setsar); static const AVFilterPad avfilter_vf_setsar_inputs[] = { { .name = "default", .type = AVMEDIA_TYPE_VIDEO, .config_props = setsar_config_props, .filter_frame = filter_frame, }, { NULL } }; static const AVFilterPad avfilter_vf_setsar_outputs[] = { { .name = "default", .type = AVMEDIA_TYPE_VIDEO, }, { NULL } }; AVFilter ff_vf_setsar = { .name = "setsar", .description = NULL_IF_CONFIG_SMALL("Set the pixel sample aspect ratio."), .init = init, .priv_size = sizeof(AspectContext), .priv_class = &setsar_class, .inputs = avfilter_vf_setsar_inputs, .outputs = avfilter_vf_setsar_outputs, }; #endif /* CONFIG_SETSAR_FILTER */