| /* |
| * 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/mathematics.h" |
| #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; |
| char c = 0; |
| |
| if (args) { |
| if (sscanf(args, "%d:%d%c", &aspect->aspect.num, &aspect->aspect.den, &c) != 2) |
| if (sscanf(args, "%lf%c", &ratio, &c) == 1) |
| aspect->aspect = av_d2q(ratio, 100); |
| |
| if (c || aspect->aspect.num <= 0 || aspect->aspect.den <= 0) { |
| av_log(ctx, AV_LOG_ERROR, |
| "Invalid string '%s' for aspect ratio.\n", args); |
| return AVERROR(EINVAL); |
| } |
| |
| 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}; |
| |
| av_log(ctx, AV_LOG_INFO, "a:%d/%d\n", aspect->aspect.num, aspect->aspect.den); |
| return 0; |
| } |
| |
| static void start_frame(AVFilterLink *link, AVFilterBufferRef *picref) |
| { |
| AspectContext *aspect = link->dst->priv; |
| |
| picref->video->sample_aspect_ratio = aspect->aspect; |
| avfilter_start_frame(link->dst->outputs[0], picref); |
| } |
| |
| #if CONFIG_SETDAR_FILTER |
| /* for setdar filter, convert from frame aspect ratio to pixel aspect ratio */ |
| static int setdar_config_props(AVFilterLink *inlink) |
| { |
| AspectContext *aspect = inlink->dst->priv; |
| AVRational dar = aspect->aspect; |
| |
| av_reduce(&aspect->aspect.num, &aspect->aspect.den, |
| aspect->aspect.num * inlink->h, |
| aspect->aspect.den * inlink->w, 100); |
| |
| av_log(inlink->dst, AV_LOG_INFO, "w:%d h:%d -> dar:%d/%d sar:%d/%d\n", |
| inlink->w, inlink->h, dar.num, dar.den, aspect->aspect.num, aspect->aspect.den); |
| |
| inlink->sample_aspect_ratio = aspect->aspect; |
| |
| return 0; |
| } |
| |
| AVFilter avfilter_vf_setdar = { |
| .name = "setdar", |
| .description = NULL_IF_CONFIG_SMALL("Set the frame display aspect ratio."), |
| |
| .init = init, |
| |
| .priv_size = sizeof(AspectContext), |
| |
| .inputs = (const AVFilterPad[]) {{ .name = "default", |
| .type = AVMEDIA_TYPE_VIDEO, |
| .config_props = setdar_config_props, |
| .get_video_buffer = avfilter_null_get_video_buffer, |
| .start_frame = start_frame, |
| .end_frame = avfilter_null_end_frame }, |
| { .name = NULL}}, |
| |
| .outputs = (const AVFilterPad[]) {{ .name = "default", |
| .type = AVMEDIA_TYPE_VIDEO, }, |
| { .name = NULL}}, |
| }; |
| #endif /* CONFIG_SETDAR_FILTER */ |
| |
| #if CONFIG_SETSAR_FILTER |
| /* for setdar filter, convert from frame aspect ratio to pixel aspect ratio */ |
| static int setsar_config_props(AVFilterLink *inlink) |
| { |
| AspectContext *aspect = inlink->dst->priv; |
| |
| inlink->sample_aspect_ratio = aspect->aspect; |
| |
| return 0; |
| } |
| |
| AVFilter avfilter_vf_setsar = { |
| .name = "setsar", |
| .description = NULL_IF_CONFIG_SMALL("Set the pixel sample aspect ratio."), |
| |
| .init = init, |
| |
| .priv_size = sizeof(AspectContext), |
| |
| .inputs = (const AVFilterPad[]) {{ .name = "default", |
| .type = AVMEDIA_TYPE_VIDEO, |
| .config_props = setsar_config_props, |
| .get_video_buffer = avfilter_null_get_video_buffer, |
| .start_frame = start_frame, |
| .end_frame = avfilter_null_end_frame }, |
| { .name = NULL}}, |
| |
| .outputs = (const AVFilterPad[]) {{ .name = "default", |
| .type = AVMEDIA_TYPE_VIDEO, }, |
| { .name = NULL}}, |
| }; |
| #endif /* CONFIG_SETSAR_FILTER */ |
| |