1/* 2 * Copyright (c) 2008 vmrsss 3 * Copyright (c) 2009 Stefano Sabatini 4 * 5 * This file is part of Libav. 6 * 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. 11 * 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. 16 * 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 20 */ 21 22/** 23 * @file 24 * video padding filter 25 */ 26 27#include "avfilter.h" 28#include "libavutil/avstring.h" 29#include "libavutil/eval.h" 30#include "libavutil/pixdesc.h" 31#include "libavutil/colorspace.h" 32#include "libavutil/avassert.h" 33#include "libavutil/imgutils.h" 34#include "libavutil/parseutils.h" 35#include "libavutil/mathematics.h" 36#include "drawutils.h" 37 38static const char *var_names[] = { 39 "PI", 40 "PHI", 41 "E", 42 "in_w", "iw", 43 "in_h", "ih", 44 "out_w", "ow", 45 "out_h", "oh", 46 "x", 47 "y", 48 "a", 49 "hsub", 50 "vsub", 51 NULL 52}; 53 54enum var_name { 55 VAR_PI, 56 VAR_PHI, 57 VAR_E, 58 VAR_IN_W, VAR_IW, 59 VAR_IN_H, VAR_IH, 60 VAR_OUT_W, VAR_OW, 61 VAR_OUT_H, VAR_OH, 62 VAR_X, 63 VAR_Y, 64 VAR_A, 65 VAR_HSUB, 66 VAR_VSUB, 67 VARS_NB 68}; 69 70static int query_formats(AVFilterContext *ctx) 71{ 72 static const enum PixelFormat pix_fmts[] = { 73 PIX_FMT_ARGB, PIX_FMT_RGBA, 74 PIX_FMT_ABGR, PIX_FMT_BGRA, 75 PIX_FMT_RGB24, PIX_FMT_BGR24, 76 77 PIX_FMT_YUV444P, PIX_FMT_YUV422P, 78 PIX_FMT_YUV420P, PIX_FMT_YUV411P, 79 PIX_FMT_YUV410P, PIX_FMT_YUV440P, 80 PIX_FMT_YUVJ444P, PIX_FMT_YUVJ422P, 81 PIX_FMT_YUVJ420P, PIX_FMT_YUVJ440P, 82 PIX_FMT_YUVA420P, 83 84 PIX_FMT_NONE 85 }; 86 87 avfilter_set_common_formats(ctx, avfilter_make_format_list(pix_fmts)); 88 return 0; 89} 90 91typedef struct { 92 int w, h; ///< output dimensions, a value of 0 will result in the input size 93 int x, y; ///< offsets of the input area with respect to the padded area 94 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 95 96 char w_expr[256]; ///< width expression string 97 char h_expr[256]; ///< height expression string 98 char x_expr[256]; ///< width expression string 99 char y_expr[256]; ///< height expression string 100 101 uint8_t color[4]; ///< color expressed either in YUVA or RGBA colorspace for the padding area 102 uint8_t *line[4]; 103 int line_step[4]; 104 int hsub, vsub; ///< chroma subsampling values 105 int needs_copy; 106} PadContext; 107 108static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque) 109{ 110 PadContext *pad = ctx->priv; 111 char color_string[128] = "black"; 112 113 av_strlcpy(pad->w_expr, "iw", sizeof(pad->w_expr)); 114 av_strlcpy(pad->h_expr, "ih", sizeof(pad->h_expr)); 115 av_strlcpy(pad->x_expr, "0" , sizeof(pad->w_expr)); 116 av_strlcpy(pad->y_expr, "0" , sizeof(pad->h_expr)); 117 118 if (args) 119 sscanf(args, "%255[^:]:%255[^:]:%255[^:]:%255[^:]:%255s", 120 pad->w_expr, pad->h_expr, pad->x_expr, pad->y_expr, color_string); 121 122 if (av_parse_color(pad->color, color_string, -1, ctx) < 0) 123 return AVERROR(EINVAL); 124 125 return 0; 126} 127 128static av_cold void uninit(AVFilterContext *ctx) 129{ 130 PadContext *pad = ctx->priv; 131 int i; 132 133 for (i = 0; i < 4; i++) { 134 av_freep(&pad->line[i]); 135 pad->line_step[i] = 0; 136 } 137} 138 139static int config_input(AVFilterLink *inlink) 140{ 141 AVFilterContext *ctx = inlink->dst; 142 PadContext *pad = ctx->priv; 143 const AVPixFmtDescriptor *pix_desc = &av_pix_fmt_descriptors[inlink->format]; 144 uint8_t rgba_color[4]; 145 int ret, is_packed_rgba; 146 double var_values[VARS_NB], res; 147 char *expr; 148 149 pad->hsub = pix_desc->log2_chroma_w; 150 pad->vsub = pix_desc->log2_chroma_h; 151 152 var_values[VAR_PI] = M_PI; 153 var_values[VAR_PHI] = M_PHI; 154 var_values[VAR_E] = M_E; 155 var_values[VAR_IN_W] = var_values[VAR_IW] = inlink->w; 156 var_values[VAR_IN_H] = var_values[VAR_IH] = inlink->h; 157 var_values[VAR_OUT_W] = var_values[VAR_OW] = NAN; 158 var_values[VAR_OUT_H] = var_values[VAR_OH] = NAN; 159 var_values[VAR_A] = (double) inlink->w / inlink->h; 160 var_values[VAR_HSUB] = 1<<pad->hsub; 161 var_values[VAR_VSUB] = 1<<pad->vsub; 162 163 /* evaluate width and height */ 164 av_expr_parse_and_eval(&res, (expr = pad->w_expr), 165 var_names, var_values, 166 NULL, NULL, NULL, NULL, NULL, 0, ctx); 167 pad->w = var_values[VAR_OUT_W] = var_values[VAR_OW] = res; 168 if ((ret = av_expr_parse_and_eval(&res, (expr = pad->h_expr), 169 var_names, var_values, 170 NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0) 171 goto eval_fail; 172 pad->h = var_values[VAR_OUT_H] = var_values[VAR_OH] = res; 173 /* evaluate the width again, as it may depend on the evaluated output height */ 174 if ((ret = av_expr_parse_and_eval(&res, (expr = pad->w_expr), 175 var_names, var_values, 176 NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0) 177 goto eval_fail; 178 pad->w = var_values[VAR_OUT_W] = var_values[VAR_OW] = res; 179 180 /* evaluate x and y */ 181 av_expr_parse_and_eval(&res, (expr = pad->x_expr), 182 var_names, var_values, 183 NULL, NULL, NULL, NULL, NULL, 0, ctx); 184 pad->x = var_values[VAR_X] = res; 185 if ((ret = av_expr_parse_and_eval(&res, (expr = pad->y_expr), 186 var_names, var_values, 187 NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0) 188 goto eval_fail; 189 pad->y = var_values[VAR_Y] = res; 190 /* evaluate x again, as it may depend on the evaluated y value */ 191 if ((ret = av_expr_parse_and_eval(&res, (expr = pad->x_expr), 192 var_names, var_values, 193 NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0) 194 goto eval_fail; 195 pad->x = var_values[VAR_X] = res; 196 197 /* sanity check params */ 198 if (pad->w < 0 || pad->h < 0 || pad->x < 0 || pad->y < 0) { 199 av_log(ctx, AV_LOG_ERROR, "Negative values are not acceptable.\n"); 200 return AVERROR(EINVAL); 201 } 202 203 if (!pad->w) 204 pad->w = inlink->w; 205 if (!pad->h) 206 pad->h = inlink->h; 207 208 pad->w &= ~((1 << pad->hsub) - 1); 209 pad->h &= ~((1 << pad->vsub) - 1); 210 pad->x &= ~((1 << pad->hsub) - 1); 211 pad->y &= ~((1 << pad->vsub) - 1); 212 213 pad->in_w = inlink->w & ~((1 << pad->hsub) - 1); 214 pad->in_h = inlink->h & ~((1 << pad->vsub) - 1); 215 216 memcpy(rgba_color, pad->color, sizeof(rgba_color)); 217 ff_fill_line_with_color(pad->line, pad->line_step, pad->w, pad->color, 218 inlink->format, rgba_color, &is_packed_rgba, NULL); 219 220 av_log(ctx, AV_LOG_INFO, "w:%d h:%d -> w:%d h:%d x:%d y:%d color:0x%02X%02X%02X%02X[%s]\n", 221 inlink->w, inlink->h, pad->w, pad->h, pad->x, pad->y, 222 pad->color[0], pad->color[1], pad->color[2], pad->color[3], 223 is_packed_rgba ? "rgba" : "yuva"); 224 225 if (pad->x < 0 || pad->y < 0 || 226 pad->w <= 0 || pad->h <= 0 || 227 (unsigned)pad->x + (unsigned)inlink->w > pad->w || 228 (unsigned)pad->y + (unsigned)inlink->h > pad->h) { 229 av_log(ctx, AV_LOG_ERROR, 230 "Input area %d:%d:%d:%d not within the padded area 0:0:%d:%d or zero-sized\n", 231 pad->x, pad->y, pad->x + inlink->w, pad->y + inlink->h, pad->w, pad->h); 232 return AVERROR(EINVAL); 233 } 234 235 return 0; 236 237eval_fail: 238 av_log(NULL, AV_LOG_ERROR, 239 "Error when evaluating the expression '%s'\n", expr); 240 return ret; 241 242} 243 244static int config_output(AVFilterLink *outlink) 245{ 246 PadContext *pad = outlink->src->priv; 247 248 outlink->w = pad->w; 249 outlink->h = pad->h; 250 return 0; 251} 252 253static AVFilterBufferRef *get_video_buffer(AVFilterLink *inlink, int perms, int w, int h) 254{ 255 PadContext *pad = inlink->dst->priv; 256 257 AVFilterBufferRef *picref = avfilter_get_video_buffer(inlink->dst->outputs[0], perms, 258 w + (pad->w - pad->in_w), 259 h + (pad->h - pad->in_h)); 260 int plane; 261 262 picref->video->w = w; 263 picref->video->h = h; 264 265 for (plane = 0; plane < 4 && picref->data[plane]; plane++) { 266 int hsub = (plane == 1 || plane == 2) ? pad->hsub : 0; 267 int vsub = (plane == 1 || plane == 2) ? pad->vsub : 0; 268 269 picref->data[plane] += (pad->x >> hsub) * pad->line_step[plane] + 270 (pad->y >> vsub) * picref->linesize[plane]; 271 } 272 273 return picref; 274} 275 276static int does_clip(PadContext *pad, AVFilterBufferRef *outpicref, int plane, int hsub, int vsub, int x, int y) 277{ 278 int64_t x_in_buf, y_in_buf; 279 280 x_in_buf = outpicref->data[plane] - outpicref->buf->data[plane] 281 + (x >> hsub) * pad ->line_step[plane] 282 + (y >> vsub) * outpicref->linesize [plane]; 283 284 if(x_in_buf < 0 || x_in_buf % pad->line_step[plane]) 285 return 1; 286 x_in_buf /= pad->line_step[plane]; 287 288 av_assert0(outpicref->buf->linesize[plane]>0); //while reference can use negative linesize the main buffer should not 289 290 y_in_buf = x_in_buf / outpicref->buf->linesize[plane]; 291 x_in_buf %= outpicref->buf->linesize[plane]; 292 293 if( y_in_buf<<vsub >= outpicref->buf->h 294 || x_in_buf<<hsub >= outpicref->buf->w) 295 return 1; 296 return 0; 297} 298 299static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *inpicref) 300{ 301 PadContext *pad = inlink->dst->priv; 302 AVFilterBufferRef *outpicref = avfilter_ref_buffer(inpicref, ~0); 303 AVFilterBufferRef *for_next_filter; 304 int plane; 305 306 for (plane = 0; plane < 4 && outpicref->data[plane]; plane++) { 307 int hsub = (plane == 1 || plane == 2) ? pad->hsub : 0; 308 int vsub = (plane == 1 || plane == 2) ? pad->vsub : 0; 309 310 av_assert0(outpicref->buf->w>0 && outpicref->buf->h>0); 311 312 if(outpicref->format != outpicref->buf->format) //unsupported currently 313 break; 314 315 outpicref->data[plane] -= (pad->x >> hsub) * pad ->line_step[plane] 316 + (pad->y >> vsub) * outpicref->linesize [plane]; 317 318 if( does_clip(pad, outpicref, plane, hsub, vsub, 0, 0) 319 || does_clip(pad, outpicref, plane, hsub, vsub, 0, pad->h-1) 320 || does_clip(pad, outpicref, plane, hsub, vsub, pad->w-1, 0) 321 || does_clip(pad, outpicref, plane, hsub, vsub, pad->w-1, pad->h-1) 322 ) 323 break; 324 } 325 pad->needs_copy= plane < 4 && outpicref->data[plane]; 326 if(pad->needs_copy){ 327 av_log(inlink->dst, AV_LOG_DEBUG, "Direct padding impossible allocating new frame\n"); 328 avfilter_unref_buffer(outpicref); 329 outpicref = avfilter_get_video_buffer(inlink->dst->outputs[0], AV_PERM_WRITE | AV_PERM_NEG_LINESIZES, 330 FFMAX(inlink->w, pad->w), 331 FFMAX(inlink->h, pad->h)); 332 avfilter_copy_buffer_ref_props(outpicref, inpicref); 333 } 334 335 inlink->dst->outputs[0]->out_buf = outpicref; 336 337 outpicref->video->w = pad->w; 338 outpicref->video->h = pad->h; 339 340 for_next_filter = avfilter_ref_buffer(outpicref, ~0); 341 avfilter_start_frame(inlink->dst->outputs[0], for_next_filter); 342} 343 344static void end_frame(AVFilterLink *link) 345{ 346 avfilter_end_frame(link->dst->outputs[0]); 347 avfilter_unref_buffer(link->dst->outputs[0]->out_buf); 348 avfilter_unref_buffer(link->cur_buf); 349} 350 351static void draw_send_bar_slice(AVFilterLink *link, int y, int h, int slice_dir, int before_slice) 352{ 353 PadContext *pad = link->dst->priv; 354 int bar_y, bar_h = 0; 355 356 if (slice_dir * before_slice == 1 && y == pad->y) { 357 /* top bar */ 358 bar_y = 0; 359 bar_h = pad->y; 360 } else if (slice_dir * before_slice == -1 && (y + h) == (pad->y + pad->in_h)) { 361 /* bottom bar */ 362 bar_y = pad->y + pad->in_h; 363 bar_h = pad->h - pad->in_h - pad->y; 364 } 365 366 if (bar_h) { 367 ff_draw_rectangle(link->dst->outputs[0]->out_buf->data, 368 link->dst->outputs[0]->out_buf->linesize, 369 pad->line, pad->line_step, pad->hsub, pad->vsub, 370 0, bar_y, pad->w, bar_h); 371 avfilter_draw_slice(link->dst->outputs[0], bar_y, bar_h, slice_dir); 372 } 373} 374 375static void draw_slice(AVFilterLink *link, int y, int h, int slice_dir) 376{ 377 PadContext *pad = link->dst->priv; 378 AVFilterBufferRef *outpic = link->dst->outputs[0]->out_buf; 379 AVFilterBufferRef *inpic = link->cur_buf; 380 381 y += pad->y; 382 383 y &= ~((1 << pad->vsub) - 1); 384 h &= ~((1 << pad->vsub) - 1); 385 386 if (!h) 387 return; 388 draw_send_bar_slice(link, y, h, slice_dir, 1); 389 390 /* left border */ 391 ff_draw_rectangle(outpic->data, outpic->linesize, pad->line, pad->line_step, 392 pad->hsub, pad->vsub, 0, y, pad->x, h); 393 394 if(pad->needs_copy){ 395 ff_copy_rectangle(outpic->data, outpic->linesize, 396 inpic->data, inpic->linesize, pad->line_step, 397 pad->hsub, pad->vsub, 398 pad->x, y, y-pad->y, inpic->video->w, h); 399 } 400 401 /* right border */ 402 ff_draw_rectangle(outpic->data, outpic->linesize, 403 pad->line, pad->line_step, pad->hsub, pad->vsub, 404 pad->x + pad->in_w, y, pad->w - pad->x - pad->in_w, h); 405 avfilter_draw_slice(link->dst->outputs[0], y, h, slice_dir); 406 407 draw_send_bar_slice(link, y, h, slice_dir, -1); 408} 409 410AVFilter avfilter_vf_pad = { 411 .name = "pad", 412 .description = NULL_IF_CONFIG_SMALL("Pad input image to width:height[:x:y[:color]] (default x and y: 0, default color: black)."), 413 414 .priv_size = sizeof(PadContext), 415 .init = init, 416 .uninit = uninit, 417 .query_formats = query_formats, 418 419 .inputs = (AVFilterPad[]) {{ .name = "default", 420 .type = AVMEDIA_TYPE_VIDEO, 421 .config_props = config_input, 422 .get_video_buffer = get_video_buffer, 423 .start_frame = start_frame, 424 .draw_slice = draw_slice, 425 .end_frame = end_frame, }, 426 { .name = NULL}}, 427 428 .outputs = (AVFilterPad[]) {{ .name = "default", 429 .type = AVMEDIA_TYPE_VIDEO, 430 .config_props = config_output, }, 431 { .name = NULL}}, 432}; 433