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- /*
- * Aspect ratio modification video filter
- * 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 filter
- */
- #include "avfilter.h"
- typedef struct {
- AVRational aspect;
- } AspectContext;
- static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
- {
- AspectContext *aspect = ctx->priv;
- double ratio;
- int64_t gcd;
- if(args) {
- if(sscanf(args, "%d:%d", &aspect->aspect.num, &aspect->aspect.den) < 2) {
- if(sscanf(args, "%lf", &ratio) < 1)
- return -1;
- aspect->aspect = av_d2q(ratio, 100);
- } else {
- gcd = av_gcd(FFABS(aspect->aspect.num), FFABS(aspect->aspect.den));
- if(gcd) {
- aspect->aspect.num /= gcd;
- aspect->aspect.den /= gcd;
- }
- }
- }
- if(aspect->aspect.den == 0)
- aspect->aspect = (AVRational) {0, 1};
- return 0;
- }
- static void start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
- {
- AspectContext *aspect = link->dst->priv;
- picref->video->pixel_aspect = aspect->aspect;
- avfilter_start_frame(link->dst->outputs[0], picref);
- }
- #if CONFIG_ASPECT_FILTER
- /* for aspect filter, convert from frame aspect ratio to pixel aspect ratio */
- static int frameaspect_config_props(AVFilterLink *inlink)
- {
- AspectContext *aspect = inlink->dst->priv;
- av_reduce(&aspect->aspect.num, &aspect->aspect.den,
- aspect->aspect.num * inlink->h,
- aspect->aspect.den * inlink->w, 100);
- return 0;
- }
- AVFilter avfilter_vf_aspect = {
- .name = "aspect",
- .description = NULL_IF_CONFIG_SMALL("Set the frame aspect ratio."),
- .init = init,
- .priv_size = sizeof(AspectContext),
- .inputs = (AVFilterPad[]) {{ .name = "default",
- .type = AVMEDIA_TYPE_VIDEO,
- .config_props = frameaspect_config_props,
- .get_video_buffer = avfilter_null_get_video_buffer,
- .start_frame = start_frame,
- .end_frame = avfilter_null_end_frame },
- { .name = NULL}},
- .outputs = (AVFilterPad[]) {{ .name = "default",
- .type = AVMEDIA_TYPE_VIDEO, },
- { .name = NULL}},
- };
- #endif /* CONFIG_ASPECT_FILTER */
- #if CONFIG_PIXELASPECT_FILTER
- AVFilter avfilter_vf_pixelaspect = {
- .name = "pixelaspect",
- .description = NULL_IF_CONFIG_SMALL("Set the pixel aspect ratio."),
- .init = init,
- .priv_size = sizeof(AspectContext),
- .inputs = (AVFilterPad[]) {{ .name = "default",
- .type = AVMEDIA_TYPE_VIDEO,
- .get_video_buffer = avfilter_null_get_video_buffer,
- .start_frame = start_frame,
- .end_frame = avfilter_null_end_frame },
- { .name = NULL}},
- .outputs = (AVFilterPad[]) {{ .name = "default",
- .type = AVMEDIA_TYPE_VIDEO, },
- { .name = NULL}},
- };
- #endif /* CONFIG_PIXELASPECT_FILTER */
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