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| 1 | +/* |
| 2 | + * copyright (c) 2007 Bobby Bingham |
| 3 | + * |
| 4 | + * This file is part of FFmpeg. |
| 5 | + * |
| 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. |
| 10 | + * |
| 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. |
| 15 | + * |
| 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 |
| 19 | + */ |
| 20 | + |
| 21 | +/** |
| 22 | + * @file libavfilter/vf_slicify.c |
| 23 | + * video slicing filter |
| 24 | + */ |
| 25 | + |
| 26 | +#include "avfilter.h" |
| 27 | + |
| 28 | +typedef struct { |
| 29 | + int h; ///< output slice height |
| 30 | + int vshift; ///< vertical chroma subsampling shift |
| 31 | +} SliceContext; |
| 32 | + |
| 33 | +static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque) |
| 34 | +{ |
| 35 | + SliceContext *slice = ctx->priv; |
| 36 | + |
| 37 | + slice->h = 16; |
| 38 | + if (args) |
| 39 | + sscanf(args, "%d", &slice->h); |
| 40 | + |
| 41 | + return 0; |
| 42 | +} |
| 43 | + |
| 44 | +static int config_props(AVFilterLink *link) |
| 45 | +{ |
| 46 | + SliceContext *slice = link->dst->priv; |
| 47 | + int tmp; |
| 48 | + |
| 49 | + avcodec_get_chroma_sub_sample(link->format, &tmp, &slice->vshift); |
| 50 | + |
| 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)); |
| 54 | + |
| 55 | + av_log(link->dst, AV_LOG_INFO, "h:%d\n", slice->h); |
| 56 | + |
| 57 | + return 0; |
| 58 | +} |
| 59 | + |
| 60 | +static AVFilterPicRef *get_video_buffer(AVFilterLink *link, int perms, |
| 61 | + int w, int h) |
| 62 | +{ |
| 63 | + return avfilter_get_video_buffer(link->dst->outputs[0], perms, w, h); |
| 64 | +} |
| 65 | + |
| 66 | +static void start_frame(AVFilterLink *link, AVFilterPicRef *picref) |
| 67 | +{ |
| 68 | + avfilter_start_frame(link->dst->outputs[0], picref); |
| 69 | +} |
| 70 | + |
| 71 | +static void end_frame(AVFilterLink *link) |
| 72 | +{ |
| 73 | + avfilter_end_frame(link->dst->outputs[0]); |
| 74 | +} |
| 75 | + |
| 76 | +static void draw_slice(AVFilterLink *link, int y, int h) |
| 77 | +{ |
| 78 | + SliceContext *slice = link->dst->priv; |
| 79 | + int y2; |
| 80 | + |
| 81 | + for (y2 = y; y2 + slice->h <= y + h; y2 += slice->h) |
| 82 | + avfilter_draw_slice(link->dst->outputs[0], y2, slice->h); |
| 83 | + |
| 84 | + if (y2 < y + h) |
| 85 | + avfilter_draw_slice(link->dst->outputs[0], y2, y + h - y2); |
| 86 | +} |
| 87 | + |
| 88 | +AVFilter avfilter_vf_slicify = { |
| 89 | + .name = "slicify", |
| 90 | + .description = "Pass the images of input video on to next video filter as multiple slices.", |
| 91 | + |
| 92 | + .init = init, |
| 93 | + |
| 94 | + .priv_size = sizeof(SliceContext), |
| 95 | + |
| 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, }, |
| 103 | + { .name = NULL}}, |
| 104 | + .outputs = (AVFilterPad[]) {{ .name = "default", |
| 105 | + .type = CODEC_TYPE_VIDEO, }, |
| 106 | + { .name = NULL}}, |
| 107 | +}; |