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
27 #include "libavutil/pixdesc.h"
30 int x; ///< x offset of the non-cropped area with respect to the input area
31 int y; ///< y offset of the non-cropped area with respect to the input area
32 int w; ///< width of the cropped area
33 int h; ///< height of the cropped area
35 int bpp; ///< bits per pixel
36 int hsub, vsub; ///< chroma subsampling
39 static int query_formats(AVFilterContext *ctx)
41 static const enum PixelFormat pix_fmts[] = {
42 PIX_FMT_RGB48BE, PIX_FMT_RGB48LE,
43 PIX_FMT_ARGB, PIX_FMT_RGBA,
44 PIX_FMT_ABGR, PIX_FMT_BGRA,
45 PIX_FMT_RGB24, PIX_FMT_BGR24,
46 PIX_FMT_RGB565BE, PIX_FMT_RGB565LE,
47 PIX_FMT_RGB555BE, PIX_FMT_RGB555LE,
48 PIX_FMT_BGR565BE, PIX_FMT_BGR565LE,
49 PIX_FMT_BGR555BE, PIX_FMT_BGR555LE,
50 PIX_FMT_GRAY16BE, PIX_FMT_GRAY16LE,
51 PIX_FMT_YUV420P16LE, PIX_FMT_YUV420P16BE,
52 PIX_FMT_YUV422P16LE, PIX_FMT_YUV422P16BE,
53 PIX_FMT_YUV444P16LE, PIX_FMT_YUV444P16BE,
54 PIX_FMT_YUV444P, PIX_FMT_YUV422P,
55 PIX_FMT_YUV420P, PIX_FMT_YUV411P,
56 PIX_FMT_YUV410P, PIX_FMT_YUV440P,
57 PIX_FMT_YUVJ444P, PIX_FMT_YUVJ422P,
58 PIX_FMT_YUVJ420P, PIX_FMT_YUVJ440P,
60 PIX_FMT_RGB8, PIX_FMT_BGR8,
61 PIX_FMT_RGB4_BYTE, PIX_FMT_BGR4_BYTE,
62 PIX_FMT_PAL8, PIX_FMT_GRAY8,
66 avfilter_set_common_formats(ctx, avfilter_make_format_list(pix_fmts));
71 static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
73 CropContext *crop = ctx->priv;
76 sscanf(args, "%d:%d:%d:%d", &crop->x, &crop->y, &crop->w, &crop->h);
81 static int config_input(AVFilterLink *link)
83 AVFilterContext *ctx = link->dst;
84 CropContext *crop = ctx->priv;
86 switch (link->format) {
101 case PIX_FMT_RGB565BE:
102 case PIX_FMT_RGB565LE:
103 case PIX_FMT_RGB555BE:
104 case PIX_FMT_RGB555LE:
105 case PIX_FMT_BGR565BE:
106 case PIX_FMT_BGR565LE:
107 case PIX_FMT_BGR555BE:
108 case PIX_FMT_BGR555LE:
109 case PIX_FMT_GRAY16BE:
110 case PIX_FMT_GRAY16LE:
111 case PIX_FMT_YUV420P16LE:
112 case PIX_FMT_YUV420P16BE:
113 case PIX_FMT_YUV422P16LE:
114 case PIX_FMT_YUV422P16BE:
115 case PIX_FMT_YUV444P16LE:
116 case PIX_FMT_YUV444P16BE:
123 avcodec_get_chroma_sub_sample(link->format, &crop->hsub, &crop->vsub);
126 crop->w = link->w - crop->x;
128 crop->h = link->h - crop->y;
130 crop->x &= ~((1 << crop->hsub) - 1);
131 crop->y &= ~((1 << crop->vsub) - 1);
133 av_log(link->dst, AV_LOG_INFO, "x:%d y:%d w:%d h:%d\n",
134 crop->x, crop->y, crop->w, crop->h);
136 if (crop->x < 0 || crop->y < 0 ||
137 crop->w <= 0 || crop->h <= 0 ||
138 (unsigned)crop->x + (unsigned)crop->w > link->w ||
139 (unsigned)crop->y + (unsigned)crop->h > link->h) {
140 av_log(ctx, AV_LOG_ERROR,
141 "Output area %d:%d:%d:%d not within the input area 0:0:%d:%d or zero-sized\n",
142 crop->x, crop->y, crop->w, crop->h, link->w, link->h);
149 static int config_output(AVFilterLink *link)
151 CropContext *crop = link->src->priv;
159 static void start_frame(AVFilterLink *link, AVFilterPicRef *picref)
161 CropContext *crop = link->dst->priv;
162 AVFilterPicRef *ref2 = avfilter_ref_pic(picref, ~0);
168 ref2->data[0] += crop->y * ref2->linesize[0];
169 ref2->data[0] += (crop->x * crop->bpp) >> 3;
171 if (!(av_pix_fmt_descriptors[link->format].flags & PIX_FMT_PAL)) {
172 for (i = 1; i < 3; i ++) {
174 ref2->data[i] += (crop->y >> crop->vsub) * ref2->linesize[i];
175 ref2->data[i] += ((crop->x * crop->bpp) >> 3) >> crop->hsub;
182 ref2->data[3] += crop->y * ref2->linesize[3];
183 ref2->data[3] += (crop->x * crop->bpp) >> 3;
186 avfilter_start_frame(link->dst->outputs[0], ref2);
189 static void draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
191 AVFilterContext *ctx = link->dst;
192 CropContext *crop = ctx->priv;
194 if (y >= crop->y + crop->h || y + h <= crop->y)
201 if (y + h > crop->y + crop->h)
202 h = crop->y + crop->h - y;
204 avfilter_draw_slice(ctx->outputs[0], y - crop->y, h, slice_dir);
207 AVFilter avfilter_vf_crop = {
209 .description = NULL_IF_CONFIG_SMALL("Crop the input video to x:y:width:height."),
211 .priv_size = sizeof(CropContext),
213 .query_formats = query_formats,
216 .inputs = (AVFilterPad[]) {{ .name = "default",
217 .type = AVMEDIA_TYPE_VIDEO,
218 .start_frame = start_frame,
219 .draw_slice = draw_slice,
220 .get_video_buffer = avfilter_null_get_video_buffer,
221 .config_props = config_input, },
223 .outputs = (AVFilterPad[]) {{ .name = "default",
224 .type = AVMEDIA_TYPE_VIDEO,
225 .config_props = config_output, },