mirror of
https://git.videolan.org/git/ffmpeg.git
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215 lines
5.8 KiB
C
215 lines
5.8 KiB
C
/*
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* Copyright (c) 2010 Bobby Bingham
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* This file is part of FFmpeg.
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*
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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 "libavutil/common.h"
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#include "libavutil/opt.h"
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#include "libavutil/mathematics.h"
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#include "libavutil/parseutils.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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typedef struct {
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const AVClass *class;
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AVRational ratio;
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char *ratio_str;
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int max;
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} AspectContext;
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#define OFFSET(x) offsetof(AspectContext, x)
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#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
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static const AVOption options[] = {
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{"max", "set max value for nominator or denominator in the ratio", OFFSET(max), AV_OPT_TYPE_INT, {.i64=100}, 1, INT_MAX, FLAGS },
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{"ratio", "set ratio", OFFSET(ratio_str), AV_OPT_TYPE_STRING, {.str="0"}, 0, 0, FLAGS },
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{"r", "set ratio", OFFSET(ratio_str), AV_OPT_TYPE_STRING, {.str="0"}, 0, 0, FLAGS },
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{NULL}
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};
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static av_cold int init(AVFilterContext *ctx, const char *args, const AVClass *class)
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{
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AspectContext *aspect = ctx->priv;
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static const char *shorthand[] = { "ratio", "max", NULL };
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char c;
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int ret;
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AVRational q;
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aspect->class = class;
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av_opt_set_defaults(aspect);
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if (sscanf(args, "%d:%d%c", &q.num, &q.den, &c) == 2) {
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aspect->ratio_str = av_strdup(args);
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av_log(ctx, AV_LOG_WARNING,
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"num:den syntax is deprecated, please use num/den or named options instead\n");
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} else if ((ret = av_opt_set_from_string(aspect, args, shorthand, "=", ":")) < 0) {
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return ret;
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}
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if (aspect->ratio_str) {
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ret = av_parse_ratio(&aspect->ratio, aspect->ratio_str, aspect->max, 0, ctx);
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if (ret < 0 || aspect->ratio.num < 0 || aspect->ratio.den <= 0) {
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av_log(ctx, AV_LOG_ERROR,
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"Invalid string '%s' for aspect ratio\n", args);
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return AVERROR(EINVAL);
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}
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}
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av_log(ctx, AV_LOG_VERBOSE, "a:%d/%d\n", aspect->ratio.num, aspect->ratio.den);
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return 0;
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}
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static int filter_frame(AVFilterLink *link, AVFilterBufferRef *frame)
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{
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AspectContext *aspect = link->dst->priv;
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frame->video->sample_aspect_ratio = aspect->ratio;
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return ff_filter_frame(link->dst->outputs[0], frame);
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}
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static av_cold void uninit(AVFilterContext *ctx)
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{
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AspectContext *aspect = ctx->priv;
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av_opt_free(aspect);
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}
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#if CONFIG_SETDAR_FILTER
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#define setdar_options options
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AVFILTER_DEFINE_CLASS(setdar);
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static av_cold int setdar_init(AVFilterContext *ctx, const char *args)
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{
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return init(ctx, args, &setdar_class);
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}
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static int setdar_config_props(AVFilterLink *inlink)
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{
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AspectContext *aspect = inlink->dst->priv;
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AVRational dar = aspect->ratio;
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av_reduce(&aspect->ratio.num, &aspect->ratio.den,
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aspect->ratio.num * inlink->h,
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aspect->ratio.den * inlink->w, 100);
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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, aspect->ratio.num, aspect->ratio.den);
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inlink->sample_aspect_ratio = aspect->ratio;
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return 0;
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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 avfilter_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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.init = setdar_init,
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.uninit = uninit,
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.priv_size = sizeof(AspectContext),
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.inputs = avfilter_vf_setdar_inputs,
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.outputs = avfilter_vf_setdar_outputs,
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.priv_class = &setdar_class,
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};
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#endif /* CONFIG_SETDAR_FILTER */
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#if CONFIG_SETSAR_FILTER
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#define setsar_options options
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AVFILTER_DEFINE_CLASS(setsar);
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static av_cold int setsar_init(AVFilterContext *ctx, const char *args)
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{
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return init(ctx, args, &setsar_class);
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}
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static int setsar_config_props(AVFilterLink *inlink)
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{
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AspectContext *aspect = inlink->dst->priv;
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inlink->sample_aspect_ratio = aspect->ratio;
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return 0;
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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 avfilter_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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.init = setsar_init,
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.uninit = uninit,
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.priv_size = sizeof(AspectContext),
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.inputs = avfilter_vf_setsar_inputs,
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.outputs = avfilter_vf_setsar_outputs,
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.priv_class = &setsar_class,
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};
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#endif /* CONFIG_SETSAR_FILTER */
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