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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 | }; |