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00029 #include <sys/time.h>
00030 #include <time.h>
00031
00032 #include "libavutil/colorspace.h"
00033 #include "libavutil/file.h"
00034 #include "libavutil/opt.h"
00035 #include "libavutil/parseutils.h"
00036 #include "libavutil/pixdesc.h"
00037 #include "libavutil/tree.h"
00038 #include "avfilter.h"
00039 #include "drawutils.h"
00040
00041 #undef time
00042
00043 #include <ft2build.h>
00044 #include <freetype/config/ftheader.h>
00045 #include FT_FREETYPE_H
00046 #include FT_GLYPH_H
00047
00048 #define MAX_EXPANDED_TEXT_SIZE 2048
00049
00050 typedef struct {
00051 const AVClass *class;
00052 char *fontfile;
00053 char *text;
00054 int ft_load_flags;
00055
00056 char expanded_text[MAX_EXPANDED_TEXT_SIZE];
00058 FT_Vector positions[MAX_EXPANDED_TEXT_SIZE];
00059 char *textfile;
00060 unsigned int x;
00061 unsigned int y;
00062 int shadowx, shadowy;
00063 unsigned int fontsize;
00064 char *fontcolor_string;
00065 char *boxcolor_string;
00066 char *shadowcolor_string;
00067 uint8_t fontcolor[4];
00068 uint8_t boxcolor[4];
00069 uint8_t shadowcolor[4];
00070 uint8_t fontcolor_rgba[4];
00071 uint8_t boxcolor_rgba[4];
00072 uint8_t shadowcolor_rgba[4];
00073
00074 short int draw_box;
00075 int use_kerning;
00076 int tabsize;
00077
00078 FT_Library library;
00079 FT_Face face;
00080 struct AVTreeNode *glyphs;
00081 int hsub, vsub;
00082 int is_packed_rgb;
00083 int pixel_step[4];
00084 uint8_t rgba_map[4];
00085 uint8_t *box_line[4];
00086 } DrawTextContext;
00087
00088 #define OFFSET(x) offsetof(DrawTextContext, x)
00089
00090 static const AVOption drawtext_options[]= {
00091 {"fontfile", "set font file", OFFSET(fontfile), FF_OPT_TYPE_STRING, 0, CHAR_MIN, CHAR_MAX },
00092 {"text", "set text", OFFSET(text), FF_OPT_TYPE_STRING, 0, CHAR_MIN, CHAR_MAX },
00093 {"textfile", "set text file", OFFSET(textfile), FF_OPT_TYPE_STRING, 0, CHAR_MIN, CHAR_MAX },
00094 {"fontcolor","set foreground color", OFFSET(fontcolor_string), FF_OPT_TYPE_STRING, 0, CHAR_MIN, CHAR_MAX },
00095 {"boxcolor", "set box color", OFFSET(boxcolor_string), FF_OPT_TYPE_STRING, 0, CHAR_MIN, CHAR_MAX },
00096 {"shadowcolor", "set shadow color", OFFSET(shadowcolor_string), FF_OPT_TYPE_STRING, 0, CHAR_MIN, CHAR_MAX },
00097 {"box", "set box", OFFSET(draw_box), FF_OPT_TYPE_INT, 0, 0, 1 },
00098 {"fontsize", "set font size", OFFSET(fontsize), FF_OPT_TYPE_INT, 16, 1, 72 },
00099 {"x", "set x", OFFSET(x), FF_OPT_TYPE_INT, 0, 0, INT_MAX },
00100 {"y", "set y", OFFSET(y), FF_OPT_TYPE_INT, 0, 0, INT_MAX },
00101 {"shadowx", "set x", OFFSET(shadowx), FF_OPT_TYPE_INT, 0, 0, INT_MAX },
00102 {"shadowy", "set y", OFFSET(shadowy), FF_OPT_TYPE_INT, 0, 0, INT_MAX },
00103 {"tabsize", "set tab size", OFFSET(tabsize), FF_OPT_TYPE_INT, 4, 0, INT_MAX },
00104
00105
00106 {"ft_load_flags", "set font loading flags for libfreetype", OFFSET(ft_load_flags), FF_OPT_TYPE_FLAGS, FT_LOAD_DEFAULT|FT_LOAD_RENDER, 0, INT_MAX, 0, "ft_load_flags" },
00107 {"default", "set default", 0, FF_OPT_TYPE_CONST, FT_LOAD_DEFAULT, INT_MIN, INT_MAX, 0, "ft_load_flags" },
00108 {"no_scale", "set no_scale", 0, FF_OPT_TYPE_CONST, FT_LOAD_NO_SCALE, INT_MIN, INT_MAX, 0, "ft_load_flags" },
00109 {"no_hinting", "set no_hinting", 0, FF_OPT_TYPE_CONST, FT_LOAD_NO_HINTING, INT_MIN, INT_MAX, 0, "ft_load_flags" },
00110 {"render", "set render", 0, FF_OPT_TYPE_CONST, FT_LOAD_RENDER, INT_MIN, INT_MAX, 0, "ft_load_flags" },
00111 {"no_bitmap", "set no_bitmap", 0, FF_OPT_TYPE_CONST, FT_LOAD_NO_BITMAP, INT_MIN, INT_MAX, 0, "ft_load_flags" },
00112 {"vertical_layout", "set vertical_layout", 0, FF_OPT_TYPE_CONST, FT_LOAD_VERTICAL_LAYOUT, INT_MIN, INT_MAX, 0, "ft_load_flags" },
00113 {"force_autohint", "set force_autohint", 0, FF_OPT_TYPE_CONST, FT_LOAD_FORCE_AUTOHINT, INT_MIN, INT_MAX, 0, "ft_load_flags" },
00114 {"crop_bitmap", "set crop_bitmap", 0, FF_OPT_TYPE_CONST, FT_LOAD_CROP_BITMAP, INT_MIN, INT_MAX, 0, "ft_load_flags" },
00115 {"pedantic", "set pedantic", 0, FF_OPT_TYPE_CONST, FT_LOAD_PEDANTIC, INT_MIN, INT_MAX, 0, "ft_load_flags" },
00116 {"ignore_global_advance_width", "set ignore_global_advance_width", 0, FF_OPT_TYPE_CONST, FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH, INT_MIN, INT_MAX, 0, "ft_load_flags" },
00117 {"no_recurse", "set no_recurse", 0, FF_OPT_TYPE_CONST, FT_LOAD_NO_RECURSE, INT_MIN, INT_MAX, 0, "ft_load_flags" },
00118 {"ignore_transform", "set ignore_transform", 0, FF_OPT_TYPE_CONST, FT_LOAD_IGNORE_TRANSFORM, INT_MIN, INT_MAX, 0, "ft_load_flags" },
00119 {"monochrome", "set monochrome", 0, FF_OPT_TYPE_CONST, FT_LOAD_MONOCHROME, INT_MIN, INT_MAX, 0, "ft_load_flags" },
00120 {"linear_design", "set linear_design", 0, FF_OPT_TYPE_CONST, FT_LOAD_LINEAR_DESIGN, INT_MIN, INT_MAX, 0, "ft_load_flags" },
00121 {"no_autohint", "set no_autohint", 0, FF_OPT_TYPE_CONST, FT_LOAD_NO_AUTOHINT, INT_MIN, INT_MAX, 0, "ft_load_flags" },
00122 {NULL},
00123 };
00124
00125 static const char *drawtext_get_name(void *ctx)
00126 {
00127 return "drawtext";
00128 }
00129
00130 static const AVClass drawtext_class = {
00131 "DrawTextContext",
00132 drawtext_get_name,
00133 drawtext_options
00134 };
00135
00136 #undef __FTERRORS_H__
00137 #define FT_ERROR_START_LIST {
00138 #define FT_ERRORDEF(e, v, s) { (e), (s) },
00139 #define FT_ERROR_END_LIST { 0, NULL } };
00140
00141 struct ft_error
00142 {
00143 int err;
00144 const char *err_msg;
00145 } static ft_errors[] =
00146 #include FT_ERRORS_H
00147
00148 #define FT_ERRMSG(e) ft_errors[e].err_msg
00149
00150 typedef struct {
00151 FT_Glyph *glyph;
00152 uint32_t code;
00153 FT_Bitmap bitmap;
00154 FT_BBox bbox;
00155 int advance;
00156 int bitmap_left;
00157 int bitmap_top;
00158 } Glyph;
00159
00160 static int glyph_cmp(const Glyph *a, const Glyph *b)
00161 {
00162 int64_t diff = (int64_t)a->code - (int64_t)b->code;
00163 return diff > 0 ? 1 : diff < 0 ? -1 : 0;
00164 }
00165
00169 static int load_glyph(AVFilterContext *ctx, Glyph **glyph_ptr, uint32_t code)
00170 {
00171 DrawTextContext *dtext = ctx->priv;
00172 Glyph *glyph = av_mallocz(sizeof(Glyph));
00173 struct AVTreeNode *node = NULL;
00174 int ret;
00175
00176
00177 ret = FT_Load_Char(dtext->face, code, dtext->ft_load_flags);
00178 if (ret)
00179 return AVERROR(EINVAL);
00180
00181
00182 glyph->code = code;
00183 glyph->glyph = av_mallocz(sizeof(FT_Glyph));
00184 ret = FT_Get_Glyph(dtext->face->glyph, glyph->glyph);
00185 if (ret)
00186 return AVERROR(EINVAL);
00187
00188 glyph->bitmap = dtext->face->glyph->bitmap;
00189 glyph->bitmap_left = dtext->face->glyph->bitmap_left;
00190 glyph->bitmap_top = dtext->face->glyph->bitmap_top;
00191 glyph->advance = dtext->face->glyph->advance.x >> 6;
00192
00193
00194 FT_Glyph_Get_CBox(*glyph->glyph, ft_glyph_bbox_pixels, &glyph->bbox);
00195
00196
00197 if (!node)
00198 node = av_mallocz(av_tree_node_size);
00199 av_tree_insert(&dtext->glyphs, glyph, (void *)glyph_cmp, &node);
00200
00201 if (glyph_ptr)
00202 *glyph_ptr = glyph;
00203 return 0;
00204 }
00205
00206 static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
00207 {
00208 int err;
00209 DrawTextContext *dtext = ctx->priv;
00210
00211 dtext->class = &drawtext_class;
00212 av_opt_set_defaults2(dtext, 0, 0);
00213 dtext->fontcolor_string = av_strdup("black");
00214 dtext->boxcolor_string = av_strdup("white");
00215 dtext->shadowcolor_string = av_strdup("black");
00216
00217 if ((err = (av_set_options_string(dtext, args, "=", ":"))) < 0) {
00218 av_log(ctx, AV_LOG_ERROR, "Error parsing options string: '%s'\n", args);
00219 return err;
00220 }
00221
00222 if (!dtext->fontfile) {
00223 av_log(ctx, AV_LOG_ERROR, "No font filename provided\n");
00224 return AVERROR(EINVAL);
00225 }
00226
00227 if (dtext->textfile) {
00228 uint8_t *textbuf;
00229 size_t textbuf_size;
00230
00231 if (dtext->text) {
00232 av_log(ctx, AV_LOG_ERROR,
00233 "Both text and text file provided. Please provide only one\n");
00234 return AVERROR(EINVAL);
00235 }
00236 if ((err = av_file_map(dtext->textfile, &textbuf, &textbuf_size, 0, ctx)) < 0) {
00237 av_log(ctx, AV_LOG_ERROR,
00238 "The text file '%s' could not be read or is empty\n",
00239 dtext->textfile);
00240 return err;
00241 }
00242
00243 if (!(dtext->text = av_malloc(textbuf_size+1)))
00244 return AVERROR(ENOMEM);
00245 memcpy(dtext->text, textbuf, textbuf_size);
00246 dtext->text[textbuf_size] = 0;
00247 av_file_unmap(textbuf, textbuf_size);
00248 }
00249
00250 if (!dtext->text) {
00251 av_log(ctx, AV_LOG_ERROR,
00252 "Either text or a valid file must be provided\n");
00253 return AVERROR(EINVAL);
00254 }
00255
00256 if ((err = av_parse_color(dtext->fontcolor_rgba, dtext->fontcolor_string, -1, ctx))) {
00257 av_log(ctx, AV_LOG_ERROR,
00258 "Invalid font color '%s'\n", dtext->fontcolor_string);
00259 return err;
00260 }
00261
00262 if ((err = av_parse_color(dtext->boxcolor_rgba, dtext->boxcolor_string, -1, ctx))) {
00263 av_log(ctx, AV_LOG_ERROR,
00264 "Invalid box color '%s'\n", dtext->boxcolor_string);
00265 return err;
00266 }
00267
00268 if ((err = av_parse_color(dtext->shadowcolor_rgba, dtext->shadowcolor_string, -1, ctx))) {
00269 av_log(ctx, AV_LOG_ERROR,
00270 "Invalid shadow color '%s'\n", dtext->shadowcolor_string);
00271 return err;
00272 }
00273
00274 if ((err = FT_Init_FreeType(&(dtext->library)))) {
00275 av_log(ctx, AV_LOG_ERROR,
00276 "Could not load FreeType: %s\n", FT_ERRMSG(err));
00277 return AVERROR(EINVAL);
00278 }
00279
00280
00281 if ((err = FT_New_Face(dtext->library, dtext->fontfile, 0, &dtext->face))) {
00282 av_log(ctx, AV_LOG_ERROR, "Could not load fontface from file '%s': %s\n",
00283 dtext->fontfile, FT_ERRMSG(err));
00284 return AVERROR(EINVAL);
00285 }
00286 if ((err = FT_Set_Pixel_Sizes(dtext->face, 0, dtext->fontsize))) {
00287 av_log(ctx, AV_LOG_ERROR, "Could not set font size to %d pixels: %s\n",
00288 dtext->fontsize, FT_ERRMSG(err));
00289 return AVERROR(EINVAL);
00290 }
00291
00292 dtext->use_kerning = FT_HAS_KERNING(dtext->face);
00293
00294
00295 load_glyph(ctx, NULL, 0);
00296
00297 #if !HAVE_LOCALTIME_R
00298 av_log(ctx, AV_LOG_WARNING, "strftime() expansion unavailable!\n");
00299 #else
00300 if (strlen(dtext->text) >= MAX_EXPANDED_TEXT_SIZE) {
00301 av_log(ctx, AV_LOG_ERROR,
00302 "Impossible to print text, string is too big\n");
00303 return AVERROR(EINVAL);
00304 }
00305 #endif
00306
00307 return 0;
00308 }
00309
00310 static int query_formats(AVFilterContext *ctx)
00311 {
00312 static const enum PixelFormat pix_fmts[] = {
00313 PIX_FMT_ARGB, PIX_FMT_RGBA,
00314 PIX_FMT_ABGR, PIX_FMT_BGRA,
00315 PIX_FMT_RGB24, PIX_FMT_BGR24,
00316 PIX_FMT_YUV420P, PIX_FMT_YUV444P,
00317 PIX_FMT_YUV422P, PIX_FMT_YUV411P,
00318 PIX_FMT_YUV410P, PIX_FMT_YUV440P,
00319 PIX_FMT_NONE
00320 };
00321
00322 avfilter_set_common_formats(ctx, avfilter_make_format_list(pix_fmts));
00323 return 0;
00324 }
00325
00326 static int glyph_enu_free(void *opaque, void *elem)
00327 {
00328 av_free(elem);
00329 return 0;
00330 }
00331
00332 static av_cold void uninit(AVFilterContext *ctx)
00333 {
00334 DrawTextContext *dtext = ctx->priv;
00335 int i;
00336
00337 av_freep(&dtext->fontfile);
00338 av_freep(&dtext->text);
00339 av_freep(&dtext->fontcolor_string);
00340 av_freep(&dtext->boxcolor_string);
00341 av_freep(&dtext->shadowcolor_string);
00342 av_tree_enumerate(dtext->glyphs, NULL, NULL, glyph_enu_free);
00343 av_tree_destroy(dtext->glyphs);
00344 dtext->glyphs = 0;
00345 FT_Done_Face(dtext->face);
00346 FT_Done_FreeType(dtext->library);
00347
00348 for (i = 0; i < 4; i++) {
00349 av_freep(&dtext->box_line[i]);
00350 dtext->pixel_step[i] = 0;
00351 }
00352
00353 }
00354
00355 static int config_input(AVFilterLink *inlink)
00356 {
00357 DrawTextContext *dtext = inlink->dst->priv;
00358 const AVPixFmtDescriptor *pix_desc = &av_pix_fmt_descriptors[inlink->format];
00359 int ret;
00360
00361 dtext->hsub = pix_desc->log2_chroma_w;
00362 dtext->vsub = pix_desc->log2_chroma_h;
00363
00364 if ((ret =
00365 ff_fill_line_with_color(dtext->box_line, dtext->pixel_step,
00366 inlink->w, dtext->boxcolor,
00367 inlink->format, dtext->boxcolor_rgba,
00368 &dtext->is_packed_rgb, dtext->rgba_map)) < 0)
00369 return ret;
00370
00371 if (!dtext->is_packed_rgb) {
00372 uint8_t *rgba = dtext->fontcolor_rgba;
00373 dtext->fontcolor[0] = RGB_TO_Y_CCIR(rgba[0], rgba[1], rgba[2]);
00374 dtext->fontcolor[1] = RGB_TO_U_CCIR(rgba[0], rgba[1], rgba[2], 0);
00375 dtext->fontcolor[2] = RGB_TO_V_CCIR(rgba[0], rgba[1], rgba[2], 0);
00376 dtext->fontcolor[3] = rgba[3];
00377 rgba = dtext->shadowcolor_rgba;
00378 dtext->shadowcolor[0] = RGB_TO_Y_CCIR(rgba[0], rgba[1], rgba[2]);
00379 dtext->shadowcolor[1] = RGB_TO_U_CCIR(rgba[0], rgba[1], rgba[2], 0);
00380 dtext->shadowcolor[2] = RGB_TO_V_CCIR(rgba[0], rgba[1], rgba[2], 0);
00381 dtext->shadowcolor[3] = rgba[3];
00382 }
00383
00384 return 0;
00385 }
00386
00387 #define GET_BITMAP_VAL(r, c) \
00388 bitmap->pixel_mode == FT_PIXEL_MODE_MONO ? \
00389 (bitmap->buffer[(r) * bitmap->pitch + ((c)>>3)] & (0x80 >> ((c)&7))) * 255 : \
00390 bitmap->buffer[(r) * bitmap->pitch + (c)]
00391
00392 #define SET_PIXEL_YUV(picref, yuva_color, val, x, y, hsub, vsub) { \
00393 luma_pos = ((x) ) + ((y) ) * picref->linesize[0]; \
00394 alpha = yuva_color[3] * (val) * 129; \
00395 picref->data[0][luma_pos] = (alpha * yuva_color[0] + (255*255*129 - alpha) * picref->data[0][luma_pos] ) >> 23; \
00396 if(((x) & ((1<<(hsub))-1))==0 && ((y) & ((1<<(vsub))-1))==0){\
00397 chroma_pos1 = ((x) >> (hsub)) + ((y) >> (vsub)) * picref->linesize[1]; \
00398 chroma_pos2 = ((x) >> (hsub)) + ((y) >> (vsub)) * picref->linesize[2]; \
00399 picref->data[1][chroma_pos1] = (alpha * yuva_color[1] + (255*255*129 - alpha) * picref->data[1][chroma_pos1]) >> 23; \
00400 picref->data[2][chroma_pos2] = (alpha * yuva_color[2] + (255*255*129 - alpha) * picref->data[2][chroma_pos2]) >> 23; \
00401 }\
00402 }
00403
00404 static inline int draw_glyph_yuv(AVFilterBufferRef *picref, FT_Bitmap *bitmap, unsigned int x,
00405 unsigned int y, unsigned int width, unsigned int height,
00406 unsigned char yuva_color[4], int hsub, int vsub)
00407 {
00408 int r, c, alpha;
00409 unsigned int luma_pos, chroma_pos1, chroma_pos2;
00410 uint8_t src_val, dst_pixel[4];
00411
00412 for (r = 0; r < bitmap->rows && r+y < height; r++) {
00413 for (c = 0; c < bitmap->width && c+x < width; c++) {
00414
00415 dst_pixel[0] = picref->data[0][ c+x + (y+r) * picref->linesize[0]];
00416 dst_pixel[1] = picref->data[1][((c+x) >> hsub) + ((y+r) >> vsub) * picref->linesize[1]];
00417 dst_pixel[2] = picref->data[2][((c+x) >> hsub) + ((y+r) >> vsub) * picref->linesize[2]];
00418
00419
00420 src_val = GET_BITMAP_VAL(r, c);
00421 if (!src_val)
00422 continue;
00423
00424 SET_PIXEL_YUV(picref, yuva_color, src_val, c+x, y+r, hsub, vsub);
00425 }
00426 }
00427
00428 return 0;
00429 }
00430
00431 #define SET_PIXEL_RGB(picref, rgba_color, val, x, y, pixel_step, r_off, g_off, b_off, a_off) { \
00432 p = picref->data[0] + (x) * pixel_step + ((y) * picref->linesize[0]); \
00433 alpha = rgba_color[3] * (val) * 129; \
00434 *(p+r_off) = (alpha * rgba_color[0] + (255*255*129 - alpha) * *(p+r_off)) >> 23; \
00435 *(p+g_off) = (alpha * rgba_color[1] + (255*255*129 - alpha) * *(p+g_off)) >> 23; \
00436 *(p+b_off) = (alpha * rgba_color[2] + (255*255*129 - alpha) * *(p+b_off)) >> 23; \
00437 }
00438
00439 static inline int draw_glyph_rgb(AVFilterBufferRef *picref, FT_Bitmap *bitmap,
00440 unsigned int x, unsigned int y,
00441 unsigned int width, unsigned int height, int pixel_step,
00442 unsigned char rgba_color[4], uint8_t rgba_map[4])
00443 {
00444 int r, c, alpha;
00445 uint8_t *p;
00446 uint8_t src_val, dst_pixel[4];
00447
00448 for (r = 0; r < bitmap->rows && r+y < height; r++) {
00449 for (c = 0; c < bitmap->width && c+x < width; c++) {
00450
00451 dst_pixel[0] = picref->data[0][(c+x + rgba_map[0]) * pixel_step +
00452 (y+r) * picref->linesize[0]];
00453 dst_pixel[1] = picref->data[0][(c+x + rgba_map[1]) * pixel_step +
00454 (y+r) * picref->linesize[0]];
00455 dst_pixel[2] = picref->data[0][(c+x + rgba_map[2]) * pixel_step +
00456 (y+r) * picref->linesize[0]];
00457
00458
00459 src_val = GET_BITMAP_VAL(r, c);
00460 if (!src_val)
00461 continue;
00462
00463 SET_PIXEL_RGB(picref, rgba_color, src_val, c+x, y+r, pixel_step,
00464 rgba_map[0], rgba_map[1], rgba_map[2], rgba_map[3]);
00465 }
00466 }
00467
00468 return 0;
00469 }
00470
00471 static inline void drawbox(AVFilterBufferRef *picref, unsigned int x, unsigned int y,
00472 unsigned int width, unsigned int height,
00473 uint8_t *line[4], int pixel_step[4], uint8_t color[4],
00474 int hsub, int vsub, int is_rgba_packed, uint8_t rgba_map[4])
00475 {
00476 int i, j, alpha;
00477
00478 if (color[3] != 0xFF) {
00479 if (is_rgba_packed) {
00480 uint8_t *p;
00481 for (j = 0; j < height; j++)
00482 for (i = 0; i < width; i++)
00483 SET_PIXEL_RGB(picref, color, 255, i+x, y+j, pixel_step[0],
00484 rgba_map[0], rgba_map[1], rgba_map[2], rgba_map[3]);
00485 } else {
00486 unsigned int luma_pos, chroma_pos1, chroma_pos2;
00487 for (j = 0; j < height; j++)
00488 for (i = 0; i < width; i++)
00489 SET_PIXEL_YUV(picref, color, 255, i+x, y+j, hsub, vsub);
00490 }
00491 } else {
00492 ff_draw_rectangle(picref->data, picref->linesize,
00493 line, pixel_step, hsub, vsub,
00494 x, y, width, height);
00495 }
00496 }
00497
00498 static int draw_glyphs(DrawTextContext *dtext, AVFilterBufferRef *picref,
00499 int width, int height, const uint8_t rgbcolor[4], const uint8_t yuvcolor[4], int x, int y)
00500 {
00501 char *text = dtext->text;
00502 uint32_t code = 0;
00503 int i;
00504 uint8_t *p;
00505 Glyph *glyph = NULL;
00506
00507 for (i = 0, p = text; *p; i++) {
00508 Glyph dummy = { 0 };
00509 GET_UTF8(code, *p++, continue;);
00510
00511
00512 if (code == '\n' || code == '\r' || code == '\t')
00513 continue;
00514
00515 dummy.code = code;
00516 glyph = av_tree_find(dtext->glyphs, &dummy, (void *)glyph_cmp, NULL);
00517
00518 if (glyph->bitmap.pixel_mode != FT_PIXEL_MODE_MONO &&
00519 glyph->bitmap.pixel_mode != FT_PIXEL_MODE_GRAY)
00520 return AVERROR(EINVAL);
00521
00522 if (dtext->is_packed_rgb) {
00523 draw_glyph_rgb(picref, &glyph->bitmap,
00524 dtext->positions[i].x+x, dtext->positions[i].y+y, width, height,
00525 dtext->pixel_step[0], rgbcolor, dtext->rgba_map);
00526 } else {
00527 draw_glyph_yuv(picref, &glyph->bitmap,
00528 dtext->positions[i].x+x, dtext->positions[i].y+y, width, height,
00529 yuvcolor, dtext->hsub, dtext->vsub);
00530 }
00531 }
00532
00533 return 0;
00534 }
00535
00536 static int draw_text(AVFilterContext *ctx, AVFilterBufferRef *picref,
00537 int width, int height)
00538 {
00539 DrawTextContext *dtext = ctx->priv;
00540 char *text = dtext->text;
00541 uint32_t code = 0, prev_code = 0;
00542 int x = 0, y = 0, i = 0, ret;
00543 int text_height, baseline;
00544 uint8_t *p;
00545 int str_w, str_w_max;
00546 int y_min = 32000, y_max = -32000;
00547 FT_Vector delta;
00548 Glyph *glyph = NULL, *prev_glyph = NULL;
00549 Glyph dummy = { 0 };
00550
00551 #if HAVE_LOCALTIME_R
00552 time_t now = time(0);
00553 struct tm ltime;
00554 size_t expanded_text_len;
00555
00556 dtext->expanded_text[0] = '\1';
00557 expanded_text_len = strftime(dtext->expanded_text, MAX_EXPANDED_TEXT_SIZE,
00558 text, localtime_r(&now, <ime));
00559 text = dtext->expanded_text;
00560 if (expanded_text_len == 0 && dtext->expanded_text[0] != '\0') {
00561 av_log(ctx, AV_LOG_ERROR,
00562 "Impossible to print text, string is too big\n");
00563 return AVERROR(EINVAL);
00564 }
00565 #endif
00566
00567 str_w = str_w_max = 0;
00568 x = dtext->x;
00569 y = dtext->y;
00570
00571
00572 for (i = 0, p = text; *p; i++) {
00573 GET_UTF8(code, *p++, continue;);
00574
00575
00576 dummy.code = code;
00577 glyph = av_tree_find(dtext->glyphs, &dummy, (void *)glyph_cmp, NULL);
00578 if (!glyph)
00579 load_glyph(ctx, &glyph, code);
00580
00581 y_min = FFMIN(glyph->bbox.yMin, y_min);
00582 y_max = FFMAX(glyph->bbox.yMax, y_max);
00583 }
00584 text_height = y_max - y_min;
00585 baseline = y_max;
00586
00587
00588 glyph = NULL;
00589 for (i = 0, p = text; *p; i++) {
00590 GET_UTF8(code, *p++, continue;);
00591
00592
00593 if (prev_code == '\r' && code == '\n')
00594 continue;
00595
00596
00597 prev_glyph = glyph;
00598 dummy.code = code;
00599 glyph = av_tree_find(dtext->glyphs, &dummy, (void *)glyph_cmp, NULL);
00600
00601
00602 if (dtext->use_kerning && prev_glyph && glyph->code) {
00603 FT_Get_Kerning(dtext->face, prev_glyph->code, glyph->code,
00604 ft_kerning_default, &delta);
00605 x += delta.x >> 6;
00606 }
00607
00608 if (x + glyph->advance >= width || code == '\r' || code == '\n') {
00609 if (x + glyph->advance >= width)
00610 str_w_max = width - dtext->x - 1;
00611 y += text_height;
00612 x = dtext->x;
00613 }
00614
00615
00616 dtext->positions[i].x = x + glyph->bitmap_left;
00617 dtext->positions[i].y = y - glyph->bitmap_top + baseline;
00618 if (code != '\n' && code != '\r') {
00619 int advance = glyph->advance;
00620 if (code == '\t')
00621 advance *= dtext->tabsize;
00622 x += advance;
00623 str_w += advance;
00624 }
00625 prev_code = code;
00626 }
00627
00628 y += text_height;
00629 if (str_w_max == 0)
00630 str_w_max = str_w;
00631
00632
00633 if (dtext->draw_box) {
00634
00635 str_w_max = FFMIN(str_w_max, width - dtext->x - 1);
00636 y = FFMIN(y, height - 1);
00637
00638
00639 drawbox(picref, dtext->x, dtext->y, str_w_max, y-dtext->y,
00640 dtext->box_line, dtext->pixel_step, dtext->boxcolor,
00641 dtext->hsub, dtext->vsub, dtext->is_packed_rgb, dtext->rgba_map);
00642 }
00643
00644 if(dtext->shadowx || dtext->shadowy){
00645 if((ret=draw_glyphs(dtext, picref, width, height, dtext->shadowcolor_rgba, dtext->shadowcolor, dtext->shadowx, dtext->shadowy))<0)
00646 return ret;
00647 }
00648
00649 if((ret=draw_glyphs(dtext, picref, width, height, dtext->fontcolor_rgba, dtext->fontcolor, 0, 0))<0)
00650 return ret;
00651
00652 return 0;
00653 }
00654
00655 static void null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir) { }
00656
00657 static void end_frame(AVFilterLink *inlink)
00658 {
00659 AVFilterLink *outlink = inlink->dst->outputs[0];
00660 AVFilterBufferRef *picref = inlink->cur_buf;
00661
00662 draw_text(inlink->dst, picref, picref->video->w, picref->video->h);
00663
00664 avfilter_draw_slice(outlink, 0, picref->video->h, 1);
00665 avfilter_end_frame(outlink);
00666 }
00667
00668 AVFilter avfilter_vf_drawtext = {
00669 .name = "drawtext",
00670 .description = NULL_IF_CONFIG_SMALL("Draw text on top of video frames using libfreetype library."),
00671 .priv_size = sizeof(DrawTextContext),
00672 .init = init,
00673 .uninit = uninit,
00674 .query_formats = query_formats,
00675
00676 .inputs = (AVFilterPad[]) {{ .name = "default",
00677 .type = AVMEDIA_TYPE_VIDEO,
00678 .get_video_buffer = avfilter_null_get_video_buffer,
00679 .start_frame = avfilter_null_start_frame,
00680 .draw_slice = null_draw_slice,
00681 .end_frame = end_frame,
00682 .config_props = config_input,
00683 .min_perms = AV_PERM_WRITE |
00684 AV_PERM_READ,
00685 .rej_perms = AV_PERM_PRESERVE },
00686 { .name = NULL}},
00687 .outputs = (AVFilterPad[]) {{ .name = "default",
00688 .type = AVMEDIA_TYPE_VIDEO, },
00689 { .name = NULL}},
00690 };
