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