| /* |
| * 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 "libavutil/common.h" |
| #include "libavutil/opt.h" |
| #include "libavutil/mathematics.h" |
| #include "libavutil/parseutils.h" |
| #include "avfilter.h" |
| #include "internal.h" |
| #include "video.h" |
| |
| typedef struct { |
| const AVClass *class; |
| AVRational ratio; |
| char *ratio_str; |
| int max; |
| } AspectContext; |
| |
| #define OFFSET(x) offsetof(AspectContext, x) |
| #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM |
| |
| static const AVOption options[] = { |
| {"max", "set max value for nominator or denominator in the ratio", OFFSET(max), AV_OPT_TYPE_INT, {.i64=100}, 1, INT_MAX, FLAGS }, |
| {"ratio", "set ratio", OFFSET(ratio_str), AV_OPT_TYPE_STRING, {.str="0"}, 0, 0, FLAGS }, |
| {"r", "set ratio", OFFSET(ratio_str), AV_OPT_TYPE_STRING, {.str="0"}, 0, 0, FLAGS }, |
| {NULL} |
| }; |
| |
| static av_cold int init(AVFilterContext *ctx, const char *args, const AVClass *class) |
| { |
| AspectContext *aspect = ctx->priv; |
| static const char *shorthand[] = { "ratio", "max", NULL }; |
| char c; |
| int ret; |
| AVRational q; |
| |
| aspect->class = class; |
| av_opt_set_defaults(aspect); |
| |
| if (sscanf(args, "%d:%d%c", &q.num, &q.den, &c) == 2) { |
| aspect->ratio_str = av_strdup(args); |
| av_log(ctx, AV_LOG_WARNING, |
| "num:den syntax is deprecated, please use num/den or named options instead\n"); |
| } else if ((ret = av_opt_set_from_string(aspect, args, shorthand, "=", ":")) < 0) { |
| return ret; |
| } |
| |
| if (aspect->ratio_str) { |
| ret = av_parse_ratio(&aspect->ratio, aspect->ratio_str, aspect->max, 0, ctx); |
| if (ret < 0 || aspect->ratio.num < 0 || aspect->ratio.den <= 0) { |
| av_log(ctx, AV_LOG_ERROR, |
| "Invalid string '%s' for aspect ratio\n", args); |
| return AVERROR(EINVAL); |
| } |
| } |
| |
| av_log(ctx, AV_LOG_VERBOSE, "a:%d/%d\n", aspect->ratio.num, aspect->ratio.den); |
| return 0; |
| } |
| |
| static int filter_frame(AVFilterLink *link, AVFilterBufferRef *frame) |
| { |
| AspectContext *aspect = link->dst->priv; |
| |
| frame->video->sample_aspect_ratio = aspect->ratio; |
| return ff_filter_frame(link->dst->outputs[0], frame); |
| } |
| |
| static av_cold void uninit(AVFilterContext *ctx) |
| { |
| AspectContext *aspect = ctx->priv; |
| |
| av_opt_free(aspect); |
| } |
| |
| #if CONFIG_SETDAR_FILTER |
| |
| #define setdar_options options |
| AVFILTER_DEFINE_CLASS(setdar); |
| |
| static av_cold int setdar_init(AVFilterContext *ctx, const char *args) |
| { |
| return init(ctx, args, &setdar_class); |
| } |
| |
| static int setdar_config_props(AVFilterLink *inlink) |
| { |
| AspectContext *aspect = inlink->dst->priv; |
| AVRational dar = aspect->ratio; |
| |
| av_reduce(&aspect->ratio.num, &aspect->ratio.den, |
| aspect->ratio.num * inlink->h, |
| aspect->ratio.den * inlink->w, 100); |
| |
| av_log(inlink->dst, AV_LOG_VERBOSE, "w:%d h:%d -> dar:%d/%d sar:%d/%d\n", |
| inlink->w, inlink->h, dar.num, dar.den, aspect->ratio.num, aspect->ratio.den); |
| |
| inlink->sample_aspect_ratio = aspect->ratio; |
| |
| return 0; |
| } |
| |
| static const AVFilterPad avfilter_vf_setdar_inputs[] = { |
| { |
| .name = "default", |
| .type = AVMEDIA_TYPE_VIDEO, |
| .config_props = setdar_config_props, |
| .get_video_buffer = ff_null_get_video_buffer, |
| .filter_frame = filter_frame, |
| }, |
| { NULL } |
| }; |
| |
| static const AVFilterPad avfilter_vf_setdar_outputs[] = { |
| { |
| .name = "default", |
| .type = AVMEDIA_TYPE_VIDEO, |
| }, |
| { NULL } |
| }; |
| |
| AVFilter avfilter_vf_setdar = { |
| .name = "setdar", |
| .description = NULL_IF_CONFIG_SMALL("Set the frame display aspect ratio."), |
| |
| .init = setdar_init, |
| .uninit = uninit, |
| |
| .priv_size = sizeof(AspectContext), |
| |
| .inputs = avfilter_vf_setdar_inputs, |
| |
| .outputs = avfilter_vf_setdar_outputs, |
| .priv_class = &setdar_class, |
| }; |
| |
| #endif /* CONFIG_SETDAR_FILTER */ |
| |
| #if CONFIG_SETSAR_FILTER |
| |
| #define setsar_options options |
| AVFILTER_DEFINE_CLASS(setsar); |
| |
| static av_cold int setsar_init(AVFilterContext *ctx, const char *args) |
| { |
| return init(ctx, args, &setsar_class); |
| } |
| |
| static int setsar_config_props(AVFilterLink *inlink) |
| { |
| AspectContext *aspect = inlink->dst->priv; |
| |
| inlink->sample_aspect_ratio = aspect->ratio; |
| |
| return 0; |
| } |
| |
| static const AVFilterPad avfilter_vf_setsar_inputs[] = { |
| { |
| .name = "default", |
| .type = AVMEDIA_TYPE_VIDEO, |
| .config_props = setsar_config_props, |
| .get_video_buffer = ff_null_get_video_buffer, |
| .filter_frame = filter_frame, |
| }, |
| { NULL } |
| }; |
| |
| static const AVFilterPad avfilter_vf_setsar_outputs[] = { |
| { |
| .name = "default", |
| .type = AVMEDIA_TYPE_VIDEO, |
| }, |
| { NULL } |
| }; |
| |
| AVFilter avfilter_vf_setsar = { |
| .name = "setsar", |
| .description = NULL_IF_CONFIG_SMALL("Set the pixel sample aspect ratio."), |
| |
| .init = setsar_init, |
| .uninit = uninit, |
| |
| .priv_size = sizeof(AspectContext), |
| |
| .inputs = avfilter_vf_setsar_inputs, |
| |
| .outputs = avfilter_vf_setsar_outputs, |
| .priv_class = &setsar_class, |
| }; |
| |
| #endif /* CONFIG_SETSAR_FILTER */ |