| /* |
| * Copyright (c) 2007 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 |
| * video vertical flip filter |
| */ |
| |
| #include "libavutil/pixdesc.h" |
| #include "avfilter.h" |
| |
| typedef struct { |
| int vsub; ///< vertical chroma subsampling |
| } FlipContext; |
| |
| static int config_input(AVFilterLink *link) |
| { |
| FlipContext *flip = link->dst->priv; |
| |
| flip->vsub = av_pix_fmt_descriptors[link->format].log2_chroma_h; |
| |
| return 0; |
| } |
| |
| static AVFilterBufferRef *get_video_buffer(AVFilterLink *link, int perms, |
| int w, int h) |
| { |
| FlipContext *flip = link->dst->priv; |
| AVFilterBufferRef *picref; |
| int i; |
| |
| if (!(perms & AV_PERM_NEG_LINESIZES)) |
| return avfilter_default_get_video_buffer(link, perms, w, h); |
| |
| picref = avfilter_get_video_buffer(link->dst->outputs[0], perms, w, h); |
| for (i = 0; i < 4; i ++) { |
| int vsub = i == 1 || i == 2 ? flip->vsub : 0; |
| |
| if (picref->data[i]) { |
| picref->data[i] += ((h >> vsub)-1) * picref->linesize[i]; |
| picref->linesize[i] = -picref->linesize[i]; |
| } |
| } |
| |
| return picref; |
| } |
| |
| static void start_frame(AVFilterLink *link, AVFilterBufferRef *inpicref) |
| { |
| FlipContext *flip = link->dst->priv; |
| AVFilterBufferRef *outpicref = avfilter_ref_buffer(inpicref, ~0); |
| int i; |
| |
| for (i = 0; i < 4; i ++) { |
| int vsub = i == 1 || i == 2 ? flip->vsub : 0; |
| |
| if (outpicref->data[i]) { |
| outpicref->data[i] += ((link->h >> vsub)-1) * outpicref->linesize[i]; |
| outpicref->linesize[i] = -outpicref->linesize[i]; |
| } |
| } |
| |
| avfilter_start_frame(link->dst->outputs[0], outpicref); |
| } |
| |
| static void draw_slice(AVFilterLink *link, int y, int h, int slice_dir) |
| { |
| AVFilterContext *ctx = link->dst; |
| |
| avfilter_draw_slice(ctx->outputs[0], link->h - (y+h), h, -1 * slice_dir); |
| } |
| |
| AVFilter avfilter_vf_vflip = { |
| .name = "vflip", |
| .description = NULL_IF_CONFIG_SMALL("Flip the input video vertically."), |
| |
| .priv_size = sizeof(FlipContext), |
| |
| .inputs = (const AVFilterPad[]) {{ .name = "default", |
| .type = AVMEDIA_TYPE_VIDEO, |
| .get_video_buffer = get_video_buffer, |
| .start_frame = start_frame, |
| .draw_slice = draw_slice, |
| .config_props = config_input, }, |
| { .name = NULL}}, |
| .outputs = (const AVFilterPad[]) {{ .name = "default", |
| .type = AVMEDIA_TYPE_VIDEO, }, |
| { .name = NULL}}, |
| }; |