2 * Copyright (c) 2008 vmrsss
3 * Copyright (c) 2009 Stefano Sabatini
5 * This file is part of Libav.
7 * Libav 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.
12 * Libav 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.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 * video padding filter
31 #include "libavutil/avstring.h"
32 #include "libavutil/common.h"
33 #include "libavutil/eval.h"
34 #include "libavutil/pixdesc.h"
35 #include "libavutil/colorspace.h"
36 #include "libavutil/avassert.h"
37 #include "libavutil/imgutils.h"
38 #include "libavutil/parseutils.h"
39 #include "libavutil/mathematics.h"
40 #include "drawutils.h"
42 static const char *const var_names[] = {
74 static int query_formats(AVFilterContext *ctx)
76 static const enum AVPixelFormat pix_fmts[] = {
77 AV_PIX_FMT_ARGB, AV_PIX_FMT_RGBA,
78 AV_PIX_FMT_ABGR, AV_PIX_FMT_BGRA,
79 AV_PIX_FMT_RGB24, AV_PIX_FMT_BGR24,
81 AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P,
82 AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV411P,
83 AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV440P,
84 AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ422P,
85 AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ440P,
91 ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
96 int w, h; ///< output dimensions, a value of 0 will result in the input size
97 int x, y; ///< offsets of the input area with respect to the padded area
98 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
100 char w_expr[256]; ///< width expression string
101 char h_expr[256]; ///< height expression string
102 char x_expr[256]; ///< width expression string
103 char y_expr[256]; ///< height expression string
105 uint8_t color[4]; ///< color expressed either in YUVA or RGBA colorspace for the padding area
108 int hsub, vsub; ///< chroma subsampling values
111 static av_cold int init(AVFilterContext *ctx, const char *args)
113 PadContext *pad = ctx->priv;
114 char color_string[128] = "black";
116 av_strlcpy(pad->w_expr, "iw", sizeof(pad->w_expr));
117 av_strlcpy(pad->h_expr, "ih", sizeof(pad->h_expr));
118 av_strlcpy(pad->x_expr, "0" , sizeof(pad->w_expr));
119 av_strlcpy(pad->y_expr, "0" , sizeof(pad->h_expr));
122 sscanf(args, "%255[^:]:%255[^:]:%255[^:]:%255[^:]:%255s",
123 pad->w_expr, pad->h_expr, pad->x_expr, pad->y_expr, color_string);
125 if (av_parse_color(pad->color, color_string, -1, ctx) < 0)
126 return AVERROR(EINVAL);
131 static av_cold void uninit(AVFilterContext *ctx)
133 PadContext *pad = ctx->priv;
136 for (i = 0; i < 4; i++) {
137 av_freep(&pad->line[i]);
138 pad->line_step[i] = 0;
142 static int config_input(AVFilterLink *inlink)
144 AVFilterContext *ctx = inlink->dst;
145 PadContext *pad = ctx->priv;
146 const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(inlink->format);
147 uint8_t rgba_color[4];
148 int ret, is_packed_rgba;
149 double var_values[VARS_NB], res;
152 pad->hsub = pix_desc->log2_chroma_w;
153 pad->vsub = pix_desc->log2_chroma_h;
155 var_values[VAR_PI] = M_PI;
156 var_values[VAR_PHI] = M_PHI;
157 var_values[VAR_E] = M_E;
158 var_values[VAR_IN_W] = var_values[VAR_IW] = inlink->w;
159 var_values[VAR_IN_H] = var_values[VAR_IH] = inlink->h;
160 var_values[VAR_OUT_W] = var_values[VAR_OW] = NAN;
161 var_values[VAR_OUT_H] = var_values[VAR_OH] = NAN;
162 var_values[VAR_A] = (double) inlink->w / inlink->h;
163 var_values[VAR_HSUB] = 1<<pad->hsub;
164 var_values[VAR_VSUB] = 1<<pad->vsub;
166 /* evaluate width and height */
167 av_expr_parse_and_eval(&res, (expr = pad->w_expr),
168 var_names, var_values,
169 NULL, NULL, NULL, NULL, NULL, 0, ctx);
170 pad->w = var_values[VAR_OUT_W] = var_values[VAR_OW] = res;
171 if ((ret = av_expr_parse_and_eval(&res, (expr = pad->h_expr),
172 var_names, var_values,
173 NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)
175 pad->h = var_values[VAR_OUT_H] = var_values[VAR_OH] = res;
176 /* evaluate the width again, as it may depend on the evaluated output height */
177 if ((ret = av_expr_parse_and_eval(&res, (expr = pad->w_expr),
178 var_names, var_values,
179 NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)
181 pad->w = var_values[VAR_OUT_W] = var_values[VAR_OW] = res;
183 /* evaluate x and y */
184 av_expr_parse_and_eval(&res, (expr = pad->x_expr),
185 var_names, var_values,
186 NULL, NULL, NULL, NULL, NULL, 0, ctx);
187 pad->x = var_values[VAR_X] = res;
188 if ((ret = av_expr_parse_and_eval(&res, (expr = pad->y_expr),
189 var_names, var_values,
190 NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)
192 pad->y = var_values[VAR_Y] = res;
193 /* evaluate x again, as it may depend on the evaluated y value */
194 if ((ret = av_expr_parse_and_eval(&res, (expr = pad->x_expr),
195 var_names, var_values,
196 NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0)
198 pad->x = var_values[VAR_X] = res;
200 /* sanity check params */
201 if (pad->w < 0 || pad->h < 0 || pad->x < 0 || pad->y < 0) {
202 av_log(ctx, AV_LOG_ERROR, "Negative values are not acceptable.\n");
203 return AVERROR(EINVAL);
211 pad->w &= ~((1 << pad->hsub) - 1);
212 pad->h &= ~((1 << pad->vsub) - 1);
213 pad->x &= ~((1 << pad->hsub) - 1);
214 pad->y &= ~((1 << pad->vsub) - 1);
216 pad->in_w = inlink->w & ~((1 << pad->hsub) - 1);
217 pad->in_h = inlink->h & ~((1 << pad->vsub) - 1);
219 memcpy(rgba_color, pad->color, sizeof(rgba_color));
220 ff_fill_line_with_color(pad->line, pad->line_step, pad->w, pad->color,
221 inlink->format, rgba_color, &is_packed_rgba, NULL);
223 av_log(ctx, AV_LOG_VERBOSE, "w:%d h:%d -> w:%d h:%d x:%d y:%d color:0x%02X%02X%02X%02X[%s]\n",
224 inlink->w, inlink->h, pad->w, pad->h, pad->x, pad->y,
225 pad->color[0], pad->color[1], pad->color[2], pad->color[3],
226 is_packed_rgba ? "rgba" : "yuva");
228 if (pad->x < 0 || pad->y < 0 ||
229 pad->w <= 0 || pad->h <= 0 ||
230 (unsigned)pad->x + (unsigned)inlink->w > pad->w ||
231 (unsigned)pad->y + (unsigned)inlink->h > pad->h) {
232 av_log(ctx, AV_LOG_ERROR,
233 "Input area %d:%d:%d:%d not within the padded area 0:0:%d:%d or zero-sized\n",
234 pad->x, pad->y, pad->x + inlink->w, pad->y + inlink->h, pad->w, pad->h);
235 return AVERROR(EINVAL);
241 av_log(NULL, AV_LOG_ERROR,
242 "Error when evaluating the expression '%s'\n", expr);
247 static int config_output(AVFilterLink *outlink)
249 PadContext *pad = outlink->src->priv;
256 static AVFrame *get_video_buffer(AVFilterLink *inlink, int w, int h)
258 PadContext *pad = inlink->dst->priv;
260 AVFrame *frame = ff_get_video_buffer(inlink->dst->outputs[0],
261 w + (pad->w - pad->in_w),
262 h + (pad->h - pad->in_h));
271 for (plane = 0; plane < 4 && frame->data[plane]; plane++) {
272 int hsub = (plane == 1 || plane == 2) ? pad->hsub : 0;
273 int vsub = (plane == 1 || plane == 2) ? pad->vsub : 0;
275 frame->data[plane] += (pad->x >> hsub) * pad->line_step[plane] +
276 (pad->y >> vsub) * frame->linesize[plane];
282 /* check whether each plane in this buffer can be padded without copying */
283 static int buffer_needs_copy(PadContext *s, AVFrame *frame, AVBufferRef *buf)
285 int planes[4] = { -1, -1, -1, -1}, *p = planes;
288 /* get all planes in this buffer */
289 for (i = 0; i < FF_ARRAY_ELEMS(planes) && frame->data[i]; i++) {
290 if (av_frame_get_plane_buffer(frame, i) == buf)
294 /* for each plane in this buffer, check that it can be padded without
295 * going over buffer bounds or other planes */
296 for (i = 0; i < FF_ARRAY_ELEMS(planes) && planes[i] >= 0; i++) {
297 int hsub = (planes[i] == 1 || planes[i] == 2) ? s->hsub : 0;
298 int vsub = (planes[i] == 1 || planes[i] == 2) ? s->vsub : 0;
300 uint8_t *start = frame->data[planes[i]];
301 uint8_t *end = start + (frame->height >> hsub) *
302 frame->linesize[planes[i]];
304 /* amount of free space needed before the start and after the end
306 ptrdiff_t req_start = (s->x >> hsub) * s->line_step[planes[i]] +
307 (s->y >> vsub) * frame->linesize[planes[i]];
308 ptrdiff_t req_end = ((s->w - s->x - frame->width) >> hsub) *
309 s->line_step[planes[i]] +
310 (s->y >> vsub) * frame->linesize[planes[i]];
312 if (frame->linesize[planes[i]] < (s->w >> hsub) * s->line_step[planes[i]])
314 if (start - buf->data < req_start ||
315 (buf->data + buf->size) - end < req_end)
318 #define SIGN(x) ((x) > 0 ? 1 : -1)
319 for (j = 0; j < FF_ARRAY_ELEMS(planes) & planes[j] >= 0; j++) {
320 int hsub1 = (planes[j] == 1 || planes[j] == 2) ? s->hsub : 0;
321 uint8_t *start1 = frame->data[planes[j]];
322 uint8_t *end1 = start1 + (frame->height >> hsub1) *
323 frame->linesize[planes[j]];
327 if (SIGN(start - end1) != SIGN(start - end1 - req_start) ||
328 SIGN(end - start1) != SIGN(end - start1 + req_end))
336 static int frame_needs_copy(PadContext *s, AVFrame *frame)
340 if (!av_frame_is_writable(frame))
343 for (i = 0; i < FF_ARRAY_ELEMS(frame->buf) && frame->buf[i]; i++)
344 if (buffer_needs_copy(s, frame, frame->buf[i]))
349 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
351 PadContext *pad = inlink->dst->priv;
353 int needs_copy = frame_needs_copy(pad, in);
356 av_log(inlink->dst, AV_LOG_DEBUG, "Direct padding impossible allocating new frame\n");
357 out = ff_get_video_buffer(inlink->dst->outputs[0],
358 FFMAX(inlink->w, pad->w),
359 FFMAX(inlink->h, pad->h));
362 return AVERROR(ENOMEM);
365 av_frame_copy_props(out, in);
370 for (i = 0; i < FF_ARRAY_ELEMS(out->data) && out->data[i]; i++) {
371 int hsub = (i == 1 || i == 2) ? pad->hsub : 0;
372 int vsub = (i == 1 || i == 2) ? pad->vsub : 0;
373 out->data[i] -= (pad->x >> hsub) * pad->line_step[i] +
374 (pad->y >> vsub) * out->linesize[i];
380 ff_draw_rectangle(out->data, out->linesize,
381 pad->line, pad->line_step, pad->hsub, pad->vsub,
382 0, 0, pad->w, pad->y);
386 if (pad->h > pad->y + pad->in_h) {
387 ff_draw_rectangle(out->data, out->linesize,
388 pad->line, pad->line_step, pad->hsub, pad->vsub,
389 0, pad->y + pad->in_h, pad->w, pad->h - pad->y - pad->in_h);
393 ff_draw_rectangle(out->data, out->linesize, pad->line, pad->line_step,
394 pad->hsub, pad->vsub, 0, pad->y, pad->x, in->height);
397 ff_copy_rectangle(out->data, out->linesize, in->data, in->linesize,
398 pad->line_step, pad->hsub, pad->vsub,
399 pad->x, pad->y, 0, in->width, in->height);
403 ff_draw_rectangle(out->data, out->linesize,
404 pad->line, pad->line_step, pad->hsub, pad->vsub,
405 pad->x + pad->in_w, pad->y, pad->w - pad->x - pad->in_w,
409 out->height = pad->h;
413 return ff_filter_frame(inlink->dst->outputs[0], out);
416 static const AVFilterPad avfilter_vf_pad_inputs[] = {
419 .type = AVMEDIA_TYPE_VIDEO,
420 .config_props = config_input,
421 .get_video_buffer = get_video_buffer,
422 .filter_frame = filter_frame,
427 static const AVFilterPad avfilter_vf_pad_outputs[] = {
430 .type = AVMEDIA_TYPE_VIDEO,
431 .config_props = config_output,
436 AVFilter avfilter_vf_pad = {
438 .description = NULL_IF_CONFIG_SMALL("Pad input image to width:height[:x:y[:color]] (default x and y: 0, default color: black)."),
440 .priv_size = sizeof(PadContext),
443 .query_formats = query_formats,
445 .inputs = avfilter_vf_pad_inputs,
447 .outputs = avfilter_vf_pad_outputs,