0dbdedf16970d5429777ba851906b45a1da6879a
[libav.git] / libavfilter / vf_crop.c
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_crop.c
23 * video crop filter
24 */
25
26 #include "avfilter.h"
27
28 typedef struct {
29 int x; ///< x offset of the non-cropped area with respect to the input area
30 int y; ///< y offset of the non-cropped area with respect to the input area
31 int w; ///< width of the cropped area
32 int h; ///< height of the cropped area
33
34 int bpp; ///< bits per pixel
35 int hsub, vsub; ///< chroma subsampling
36 } CropContext;
37
38 static int query_formats(AVFilterContext *ctx)
39 {
40 static const enum PixelFormat pix_fmts[] = {
41 PIX_FMT_RGB48BE, PIX_FMT_RGB48LE,
42 PIX_FMT_ARGB, PIX_FMT_RGBA,
43 PIX_FMT_ABGR, PIX_FMT_BGRA,
44 PIX_FMT_RGB24, PIX_FMT_BGR24,
45 PIX_FMT_RGB565BE, PIX_FMT_RGB565LE,
46 PIX_FMT_RGB555BE, PIX_FMT_RGB555LE,
47 PIX_FMT_BGR565BE, PIX_FMT_BGR565LE,
48 PIX_FMT_BGR555BE, PIX_FMT_BGR555LE,
49 PIX_FMT_GRAY16BE, PIX_FMT_GRAY16LE,
50 PIX_FMT_YUV420P16LE, PIX_FMT_YUV420P16BE,
51 PIX_FMT_YUV422P16LE, PIX_FMT_YUV422P16BE,
52 PIX_FMT_YUV444P16LE, PIX_FMT_YUV444P16BE,
53 PIX_FMT_YUV444P, PIX_FMT_YUV422P,
54 PIX_FMT_YUV420P, PIX_FMT_YUV411P,
55 PIX_FMT_YUV410P, PIX_FMT_YUV440P,
56 PIX_FMT_YUVJ444P, PIX_FMT_YUVJ422P,
57 PIX_FMT_YUVJ420P, PIX_FMT_YUVJ440P,
58 PIX_FMT_YUVA420P,
59 PIX_FMT_RGB8, PIX_FMT_BGR8,
60 PIX_FMT_RGB4_BYTE, PIX_FMT_BGR4_BYTE,
61 PIX_FMT_PAL8, PIX_FMT_GRAY8,
62 PIX_FMT_NONE
63 };
64
65 avfilter_set_common_formats(ctx, avfilter_make_format_list(pix_fmts));
66
67 return 0;
68 }
69
70 static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
71 {
72 CropContext *crop = ctx->priv;
73
74 if (args)
75 sscanf(args, "%d:%d:%d:%d", &crop->x, &crop->y, &crop->w, &crop->h);
76
77 return 0;
78 }
79
80 static int config_input(AVFilterLink *link)
81 {
82 AVFilterContext *ctx = link->dst;
83 CropContext *crop = ctx->priv;
84
85 switch (link->format) {
86 case PIX_FMT_RGB48BE:
87 case PIX_FMT_RGB48LE:
88 crop->bpp = 48;
89 break;
90 case PIX_FMT_ARGB:
91 case PIX_FMT_RGBA:
92 case PIX_FMT_ABGR:
93 case PIX_FMT_BGRA:
94 crop->bpp = 32;
95 break;
96 case PIX_FMT_RGB24:
97 case PIX_FMT_BGR24:
98 crop->bpp = 24;
99 break;
100 case PIX_FMT_RGB565BE:
101 case PIX_FMT_RGB565LE:
102 case PIX_FMT_RGB555BE:
103 case PIX_FMT_RGB555LE:
104 case PIX_FMT_BGR565BE:
105 case PIX_FMT_BGR565LE:
106 case PIX_FMT_BGR555BE:
107 case PIX_FMT_BGR555LE:
108 case PIX_FMT_GRAY16BE:
109 case PIX_FMT_GRAY16LE:
110 case PIX_FMT_YUV420P16LE:
111 case PIX_FMT_YUV420P16BE:
112 case PIX_FMT_YUV422P16LE:
113 case PIX_FMT_YUV422P16BE:
114 case PIX_FMT_YUV444P16LE:
115 case PIX_FMT_YUV444P16BE:
116 crop->bpp = 16;
117 break;
118 default:
119 crop->bpp = 8;
120 }
121
122 avcodec_get_chroma_sub_sample(link->format, &crop->hsub, &crop->vsub);
123
124 if (crop->w == 0)
125 crop->w = link->w - crop->x;
126 if (crop->h == 0)
127 crop->h = link->h - crop->y;
128
129 crop->x &= ~((1 << crop->hsub) - 1);
130 crop->y &= ~((1 << crop->vsub) - 1);
131
132 av_log(link->dst, AV_LOG_INFO, "x:%d y:%d w:%d h:%d\n",
133 crop->x, crop->y, crop->w, crop->h);
134
135 if (crop->x < 0 || crop->y < 0 ||
136 crop->w <= 0 || crop->h <= 0 ||
137 (unsigned)crop->x + (unsigned)crop->w > link->w ||
138 (unsigned)crop->y + (unsigned)crop->h > link->h) {
139 av_log(ctx, AV_LOG_ERROR,
140 "Output area %d:%d:%d:%d not within the input area 0:0:%d:%d or zero-sized\n",
141 crop->x, crop->y, crop->w, crop->h, link->w, link->h);
142 return -1;
143 }
144
145 return 0;
146 }
147
148 static int config_output(AVFilterLink *link)
149 {
150 CropContext *crop = link->src->priv;
151
152 link->w = crop->w;
153 link->h = crop->h;
154
155 return 0;
156 }
157
158 static AVFilterPicRef *get_video_buffer(AVFilterLink *link, int perms,
159 int w, int h)
160 {
161 return avfilter_get_video_buffer(link->dst->outputs[0], perms, w, h);
162 }
163
164 static void start_frame(AVFilterLink *link, AVFilterPicRef *picref)
165 {
166 CropContext *crop = link->dst->priv;
167 AVFilterPicRef *ref2 = avfilter_ref_pic(picref, ~0);
168 int i;
169
170 ref2->w = crop->w;
171 ref2->h = crop->h;
172
173 ref2->data[0] += crop->y * ref2->linesize[0];
174 ref2->data[0] += (crop->x * crop->bpp) >> 3;
175
176 if (link->format != PIX_FMT_PAL8 &&
177 link->format != PIX_FMT_BGR4_BYTE &&
178 link->format != PIX_FMT_RGB4_BYTE &&
179 link->format != PIX_FMT_BGR8 &&
180 link->format != PIX_FMT_RGB8) {
181 for (i = 1; i < 3; i ++) {
182 if (ref2->data[i]) {
183 ref2->data[i] += (crop->y >> crop->vsub) * ref2->linesize[i];
184 ref2->data[i] += ((crop->x * crop->bpp) >> 3) >> crop->hsub;
185 }
186 }
187 }
188
189 /* alpha plane */
190 if (ref2->data[3]) {
191 ref2->data[3] += crop->y * ref2->linesize[3];
192 ref2->data[3] += (crop->x * crop->bpp) >> 3;
193 }
194
195 avfilter_start_frame(link->dst->outputs[0], ref2);
196 }
197
198 static void draw_slice(AVFilterLink *link, int y, int h)
199 {
200 AVFilterContext *ctx = link->dst;
201 CropContext *crop = ctx->priv;
202
203 if (y >= crop->y + crop->h || y + h <= crop->y)
204 return;
205
206 if (y < crop->y) {
207 h -= crop->y - y;
208 y = crop->y;
209 }
210 if (y + h > crop->y + crop->h)
211 h = crop->y + crop->h - y;
212
213 avfilter_draw_slice(ctx->outputs[0], y - crop->y, h);
214 }
215
216 AVFilter avfilter_vf_crop = {
217 .name = "crop",
218 .description = NULL_IF_CONFIG_SMALL("Crop the input video to x:y:width:height."),
219
220 .priv_size = sizeof(CropContext),
221
222 .query_formats = query_formats,
223 .init = init,
224
225 .inputs = (AVFilterPad[]) {{ .name = "default",
226 .type = CODEC_TYPE_VIDEO,
227 .start_frame = start_frame,
228 .draw_slice = draw_slice,
229 .get_video_buffer = get_video_buffer,
230 .config_props = config_input, },
231 { .name = NULL}},
232 .outputs = (AVFilterPad[]) {{ .name = "default",
233 .type = CODEC_TYPE_VIDEO,
234 .config_props = config_output, },
235 { .name = NULL}},
236 };