2 * copyright (c) 2007 Bobby Bingham
4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 * @file libavfilter/vf_slicify.c
23 * video slicing filter
29 int h; ///< output slice height
30 int vshift; ///< vertical chroma subsampling shift
33 static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
35 SliceContext *slice = ctx->priv;
39 sscanf(args, "%d", &slice->h);
44 static int config_props(AVFilterLink *link)
46 SliceContext *slice = link->dst->priv;
49 avcodec_get_chroma_sub_sample(link->format, &tmp, &slice->vshift);
51 /* ensure that slices play nice with chroma subsampling, and enforce
52 * a reasonable minimum size for the slices */
53 slice->h = FFMAX(8, slice->h & (-1 << slice->vshift));
55 av_log(link->dst, AV_LOG_INFO, "h:%d\n", slice->h);
60 static AVFilterPicRef *get_video_buffer(AVFilterLink *link, int perms,
63 return avfilter_get_video_buffer(link->dst->outputs[0], perms, w, h);
66 static void start_frame(AVFilterLink *link, AVFilterPicRef *picref)
68 avfilter_start_frame(link->dst->outputs[0], picref);
71 static void end_frame(AVFilterLink *link)
73 avfilter_end_frame(link->dst->outputs[0]);
76 static void draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
78 SliceContext *slice = link->dst->priv;
81 for (y2 = y; y2 + slice->h <= y + h; y2 += slice->h)
82 avfilter_draw_slice(link->dst->outputs[0], y2, slice->h, slice_dir);
85 avfilter_draw_slice(link->dst->outputs[0], y2, y + h - y2, slice_dir);
88 AVFilter avfilter_vf_slicify = {
90 .description = "Pass the images of input video on to next video filter as multiple slices.",
94 .priv_size = sizeof(SliceContext),
96 .inputs = (AVFilterPad[]) {{ .name = "default",
97 .type = CODEC_TYPE_VIDEO,
98 .get_video_buffer = get_video_buffer,
99 .start_frame = start_frame,
100 .draw_slice = draw_slice,
101 .config_props = config_props,
102 .end_frame = end_frame, },
104 .outputs = (AVFilterPad[]) {{ .name = "default",
105 .type = CODEC_TYPE_VIDEO, },