Factorize out some code and implement the fill_line_with_color()
[libav.git] / libavfilter / vf_pad.c
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1/*
2 * copyright (c) 2008 vmrsss
3 * copyright (c) 2009 Stefano Sabatini
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22/**
aeaa9630 23 * @file
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24 * video padding filter
25 */
26
27#include "avfilter.h"
28#include "parseutils.h"
29#include "libavutil/pixdesc.h"
2b4abbd6 30#include "libavutil/colorspace.h"
3c940173 31
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32enum { RED = 0, GREEN, BLUE, ALPHA };
33
34static int fill_line_with_color(uint8_t *line[4], int line_step[4], int w, uint8_t color[4],
35 enum PixelFormat pix_fmt, uint8_t rgba_color[4], int *is_packed_rgba)
36{
37 uint8_t rgba_map[4] = {0};
38 int i;
39 const AVPixFmtDescriptor *pix_desc = &av_pix_fmt_descriptors[pix_fmt];
40 int hsub = pix_desc->log2_chroma_w;
41
42 *is_packed_rgba = 1;
43 switch (pix_fmt) {
44 case PIX_FMT_ARGB: rgba_map[ALPHA] = 0; rgba_map[RED ] = 1; rgba_map[GREEN] = 2; rgba_map[BLUE ] = 3; break;
45 case PIX_FMT_ABGR: rgba_map[ALPHA] = 0; rgba_map[BLUE ] = 1; rgba_map[GREEN] = 2; rgba_map[RED ] = 3; break;
46 case PIX_FMT_RGBA:
47 case PIX_FMT_RGB24: rgba_map[RED ] = 0; rgba_map[GREEN] = 1; rgba_map[BLUE ] = 2; rgba_map[ALPHA] = 3; break;
48 case PIX_FMT_BGRA:
49 case PIX_FMT_BGR24: rgba_map[BLUE ] = 0; rgba_map[GREEN] = 1; rgba_map[RED ] = 2; rgba_map[ALPHA] = 3; break;
50 default:
51 *is_packed_rgba = 0;
52 }
53
54 if (*is_packed_rgba) {
55 line_step[0] = (av_get_bits_per_pixel(pix_desc))>>3;
56 for (i = 0; i < 4; i++)
57 color[rgba_map[i]] = rgba_color[i];
58
59 line[0] = av_malloc(w * line_step[0]);
60 for (i = 0; i < w; i++)
61 memcpy(line[0] + i * line_step[0], color, line_step[0]);
62 } else {
63 int plane;
64
65 color[RED ] = RGB_TO_Y(rgba_color[0], rgba_color[1], rgba_color[2]);
66 color[GREEN] = RGB_TO_U(rgba_color[0], rgba_color[1], rgba_color[2], 0);
67 color[BLUE ] = RGB_TO_V(rgba_color[0], rgba_color[1], rgba_color[2], 0);
68 color[ALPHA] = rgba_color[3];
69
70 for (plane = 0; plane < 4; plane++) {
71 int line_size;
72 int hsub1 = (plane == 1 || plane == 2) ? hsub : 0;
73
74 line_step[plane] = 1;
75 line_size = (w >> hsub1) * line_step[plane];
76 line[plane] = av_malloc(line_size);
77 memset(line[plane], color[plane], line_size);
78 }
79 }
80
81 return 0;
82}
83
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84typedef struct {
85 int w, h; ///< output dimensions, a value of 0 will result in the input size
86 int x, y; ///< offsets of the input area with respect to the padded area
87 int in_w, in_h; ///< width and height for the padded input video, which has to be aligned to the chroma values in order to avoid chroma issues
88
89 uint8_t color[4]; ///< color expressed either in YUVA or RGBA colorspace for the padding area
90 uint8_t *line[4];
91 int line_step[4];
92 int hsub, vsub; ///< chroma subsampling values
93} PadContext;
94
95static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
96{
97 PadContext *pad = ctx->priv;
98 char color_string[128] = "black";
99
100 if (args)
101 sscanf(args, "%d:%d:%d:%d:%s", &pad->w, &pad->h, &pad->x, &pad->y, color_string);
102
103 if (av_parse_color(pad->color, color_string, ctx) < 0)
622e6ce5 104 return AVERROR(EINVAL);
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105
106 /* sanity check params */
107 if (pad->w < 0 || pad->h < 0) {
108 av_log(ctx, AV_LOG_ERROR, "Negative size values are not acceptable.\n");
622e6ce5 109 return AVERROR(EINVAL);
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110 }
111
112 return 0;
113}
114
115static av_cold void uninit(AVFilterContext *ctx)
116{
117 PadContext *pad = ctx->priv;
118 int i;
119
120 for (i = 0; i < 4; i++) {
121 av_freep(&pad->line[i]);
122 pad->line_step[i] = 0;
123 }
124}
125
126static int query_formats(AVFilterContext *ctx)
127{
128 static const enum PixelFormat pix_fmts[] = {
129 PIX_FMT_ARGB, PIX_FMT_RGBA,
130 PIX_FMT_ABGR, PIX_FMT_BGRA,
131 PIX_FMT_RGB24, PIX_FMT_BGR24,
132
133 PIX_FMT_YUV444P, PIX_FMT_YUV422P,
134 PIX_FMT_YUV420P, PIX_FMT_YUV411P,
135 PIX_FMT_YUV410P, PIX_FMT_YUV440P,
136 PIX_FMT_YUVJ444P, PIX_FMT_YUVJ422P,
137 PIX_FMT_YUVJ420P, PIX_FMT_YUVJ440P,
138 PIX_FMT_YUVA420P,
139
140 PIX_FMT_NONE
141 };
142
143 avfilter_set_common_formats(ctx, avfilter_make_format_list(pix_fmts));
144 return 0;
145}
146
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147static int config_input(AVFilterLink *inlink)
148{
149 AVFilterContext *ctx = inlink->dst;
150 PadContext *pad = ctx->priv;
151 const AVPixFmtDescriptor *pix_desc = &av_pix_fmt_descriptors[inlink->format];
152 uint8_t rgba_color[4];
039baa78 153 int is_packed_rgba;
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154
155 pad->hsub = pix_desc->log2_chroma_w;
156 pad->vsub = pix_desc->log2_chroma_h;
157
158 if (!pad->w)
159 pad->w = inlink->w;
160 if (!pad->h)
161 pad->h = inlink->h;
162
163 pad->w &= ~((1 << pad->hsub) - 1);
164 pad->h &= ~((1 << pad->vsub) - 1);
165 pad->x &= ~((1 << pad->hsub) - 1);
166 pad->y &= ~((1 << pad->vsub) - 1);
167
168 pad->in_w = inlink->w & ~((1 << pad->hsub) - 1);
169 pad->in_h = inlink->h & ~((1 << pad->vsub) - 1);
170
171 memcpy(rgba_color, pad->color, sizeof(rgba_color));
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172 fill_line_with_color(pad->line, pad->line_step, pad->w, pad->color,
173 inlink->format, rgba_color, &is_packed_rgba);
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174
175 av_log(ctx, AV_LOG_INFO, "w:%d h:%d x:%d y:%d color:0x%02X%02X%02X%02X[%s]\n",
176 pad->w, pad->h, pad->x, pad->y,
177 pad->color[0], pad->color[1], pad->color[2], pad->color[3],
039baa78 178 is_packed_rgba ? "rgba" : "yuva");
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179
180 if (pad->x < 0 || pad->y < 0 ||
181 pad->w <= 0 || pad->h <= 0 ||
182 (unsigned)pad->x + (unsigned)inlink->w > pad->w ||
183 (unsigned)pad->y + (unsigned)inlink->h > pad->h) {
184 av_log(ctx, AV_LOG_ERROR,
185 "Input area %d:%d:%d:%d not within the padded area 0:0:%d:%d or zero-sized\n",
186 pad->x, pad->y, pad->x + inlink->w, pad->y + inlink->h, pad->w, pad->h);
622e6ce5 187 return AVERROR(EINVAL);
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188 }
189
190 return 0;
191}
192
193static int config_output(AVFilterLink *outlink)
194{
195 PadContext *pad = outlink->src->priv;
196
197 outlink->w = pad->w;
198 outlink->h = pad->h;
199 return 0;
200}
201
202static AVFilterPicRef *get_video_buffer(AVFilterLink *inlink, int perms, int w, int h)
203{
204 PadContext *pad = inlink->dst->priv;
205
206 AVFilterPicRef *picref = avfilter_get_video_buffer(inlink->dst->outputs[0], perms,
207 w + (pad->w - pad->in_w),
208 h + (pad->h - pad->in_h));
f66b3905 209 int plane;
3c940173 210
f66b3905 211 for (plane = 0; plane < 4 && picref->data[plane]; plane++) {
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212 int hsub = (plane == 1 || plane == 2) ? pad->hsub : 0;
213 int vsub = (plane == 1 || plane == 2) ? pad->vsub : 0;
214
215 picref->data[plane] += (pad->x >> hsub) * pad->line_step[plane] +
216 (pad->y >> vsub) * picref->linesize[plane];
217 }
218
219 return picref;
220}
221
222static void start_frame(AVFilterLink *inlink, AVFilterPicRef *inpicref)
223{
224 PadContext *pad = inlink->dst->priv;
225 AVFilterPicRef *outpicref = avfilter_ref_pic(inpicref, ~0);
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226 int plane;
227
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228 inlink->dst->outputs[0]->outpic = outpicref;
229
f66b3905 230 for (plane = 0; plane < 4 && outpicref->data[plane]; plane++) {
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231 int hsub = (plane == 1 || plane == 2) ? pad->hsub : 0;
232 int vsub = (plane == 1 || plane == 2) ? pad->vsub : 0;
233
234 outpicref->data[plane] -= (pad->x >> hsub) * pad->line_step[plane] +
235 (pad->y >> vsub) * outpicref->linesize[plane];
236 }
237
238 avfilter_start_frame(inlink->dst->outputs[0], outpicref);
239}
240
241static void end_frame(AVFilterLink *link)
242{
243 avfilter_end_frame(link->dst->outputs[0]);
244 avfilter_unref_pic(link->cur_pic);
245}
246
247static void draw_rectangle(AVFilterPicRef *outpic, uint8_t *line[4], int line_step[4],
248 int hsub, int vsub, int x, int y, int w, int h)
249{
250 int i, plane;
251 uint8_t *p;
252
253 for (plane = 0; plane < 4 && outpic->data[plane]; plane++) {
254 int hsub1 = plane == 1 || plane == 2 ? hsub : 0;
255 int vsub1 = plane == 1 || plane == 2 ? vsub : 0;
256
257 p = outpic->data[plane] + (y >> vsub1) * outpic->linesize[plane];
258 for (i = 0; i < (h >> vsub1); i++) {
259 memcpy(p + (x >> hsub1) * line_step[plane], line[plane], (w >> hsub1) * line_step[plane]);
260 p += outpic->linesize[plane];
261 }
262 }
263}
264
265static void draw_send_bar_slice(AVFilterLink *link, int y, int h, int slice_dir, int before_slice)
266{
267 PadContext *pad = link->dst->priv;
268 int bar_y, bar_h = 0;
269
270 if (slice_dir * before_slice == 1 && y == pad->y) {
271 /* top bar */
272 bar_y = 0;
273 bar_h = pad->y;
274 } else if (slice_dir * before_slice == -1 && (y + h) == (pad->y + pad->in_h)) {
275 /* bottom bar */
276 bar_y = pad->y + pad->in_h;
277 bar_h = pad->h - pad->in_h - pad->y;
278 }
279
280 if (bar_h) {
281 draw_rectangle(link->dst->outputs[0]->outpic,
282 pad->line, pad->line_step, pad->hsub, pad->vsub,
283 0, bar_y, pad->w, bar_h);
284 avfilter_draw_slice(link->dst->outputs[0], bar_y, bar_h, slice_dir);
285 }
286}
287
288static void draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
289{
290 PadContext *pad = link->dst->priv;
291 AVFilterPicRef *outpic = link->dst->outputs[0]->outpic;
292
293 y += pad->y;
294
295 y &= ~((1 << pad->vsub) - 1);
296 h &= ~((1 << pad->vsub) - 1);
297
298 if (!h)
299 return;
300 draw_send_bar_slice(link, y, h, slice_dir, 1);
301
302 /* left border */
303 draw_rectangle(outpic, pad->line, pad->line_step, pad->hsub, pad->vsub,
304 0, y, pad->x, h);
305 /* right border */
306 draw_rectangle(outpic, pad->line, pad->line_step, pad->hsub, pad->vsub,
307 pad->x + pad->in_w, y, pad->w - pad->x - pad->in_w, h);
308 avfilter_draw_slice(link->dst->outputs[0], y, h, slice_dir);
309
310 draw_send_bar_slice(link, y, h, slice_dir, -1);
311}
312
313AVFilter avfilter_vf_pad = {
314 .name = "pad",
478b9d74 315 .description = NULL_IF_CONFIG_SMALL("Pad input image to width:height[:x:y[:color]] (default x and y: 0, default color: black)."),
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316
317 .priv_size = sizeof(PadContext),
318 .init = init,
319 .uninit = uninit,
320 .query_formats = query_formats,
321
322 .inputs = (AVFilterPad[]) {{ .name = "default",
323 .type = AVMEDIA_TYPE_VIDEO,
324 .config_props = config_input,
325 .get_video_buffer = get_video_buffer,
326 .start_frame = start_frame,
327 .draw_slice = draw_slice,
328 .end_frame = end_frame, },
329 { .name = NULL}},
330
331 .outputs = (AVFilterPad[]) {{ .name = "default",
332 .type = AVMEDIA_TYPE_VIDEO,
333 .config_props = config_output, },
334 { .name = NULL}},
335};