/* * Copyright (c) 2011 Stefano Sabatini * Copyright (c) 2010 S.N. Hemanth Meenakshisundaram * Copyright (c) 2003 Gustavo Sverzut Barbieri * * This file is part of Libav. * * Libav is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * Libav is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with Libav; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * @file * drawtext filter, based on the original FFmpeg vhook/drawtext.c * filter by Gustavo Sverzut Barbieri */ #include #include #include "libavutil/colorspace.h" #include "libavutil/file.h" #include "libavutil/opt.h" #include "libavutil/parseutils.h" #include "libavutil/pixdesc.h" #include "libavutil/tree.h" #include "avfilter.h" #include "drawutils.h" #undef time #include #include #include FT_FREETYPE_H #include FT_GLYPH_H typedef struct { const AVClass *class; uint8_t *fontfile; ///< font to be used uint8_t *text; ///< text to be drawn uint8_t *expanded_text; ///< used to contain the strftime()-expanded text size_t expanded_text_size; ///< size in bytes of the expanded_text buffer int ft_load_flags; ///< flags used for loading fonts, see FT_LOAD_* FT_Vector *positions; ///< positions for each element in the text size_t nb_positions; ///< number of elements of positions array char *textfile; ///< file with text to be drawn unsigned int x; ///< x position to start drawing text unsigned int y; ///< y position to start drawing text int shadowx, shadowy; unsigned int fontsize; ///< font size to use char *fontcolor_string; ///< font color as string char *boxcolor_string; ///< box color as string char *shadowcolor_string; ///< shadow color as string uint8_t fontcolor[4]; ///< foreground color uint8_t boxcolor[4]; ///< background color uint8_t shadowcolor[4]; ///< shadow color uint8_t fontcolor_rgba[4]; ///< foreground color in RGBA uint8_t boxcolor_rgba[4]; ///< background color in RGBA uint8_t shadowcolor_rgba[4]; ///< shadow color in RGBA short int draw_box; ///< draw box around text - true or false int use_kerning; ///< font kerning is used - true/false int tabsize; ///< tab size FT_Library library; ///< freetype font library handle FT_Face face; ///< freetype font face handle struct AVTreeNode *glyphs; ///< rendered glyphs, stored using the UTF-32 char code int hsub, vsub; ///< chroma subsampling values int is_packed_rgb; int pixel_step[4]; ///< distance in bytes between the component of each pixel uint8_t rgba_map[4]; ///< map RGBA offsets to the positions in the packed RGBA format uint8_t *box_line[4]; ///< line used for filling the box background } DrawTextContext; #define OFFSET(x) offsetof(DrawTextContext, x) static const AVOption drawtext_options[]= { {"fontfile", "set font file", OFFSET(fontfile), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX }, {"text", "set text", OFFSET(text), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX }, {"textfile", "set text file", OFFSET(textfile), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX }, {"fontcolor","set foreground color", OFFSET(fontcolor_string), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX }, {"boxcolor", "set box color", OFFSET(boxcolor_string), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX }, {"shadowcolor", "set shadow color", OFFSET(shadowcolor_string), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX }, {"box", "set box", OFFSET(draw_box), AV_OPT_TYPE_INT, {.dbl=0}, 0, 1 }, {"fontsize", "set font size", OFFSET(fontsize), AV_OPT_TYPE_INT, {.dbl=16}, 1, 72 }, {"x", "set x", OFFSET(x), AV_OPT_TYPE_INT, {.dbl=0}, 0, INT_MAX }, {"y", "set y", OFFSET(y), AV_OPT_TYPE_INT, {.dbl=0}, 0, INT_MAX }, {"shadowx", "set x", OFFSET(shadowx), AV_OPT_TYPE_INT, {.dbl=0}, INT_MIN, INT_MAX }, {"shadowy", "set y", OFFSET(shadowy), AV_OPT_TYPE_INT, {.dbl=0}, INT_MIN, INT_MAX }, {"tabsize", "set tab size", OFFSET(tabsize), AV_OPT_TYPE_INT, {.dbl=4}, 0, INT_MAX }, /* FT_LOAD_* flags */ {"ft_load_flags", "set font loading flags for libfreetype", OFFSET(ft_load_flags), AV_OPT_TYPE_FLAGS, {.dbl=FT_LOAD_DEFAULT|FT_LOAD_RENDER}, 0, INT_MAX, 0, "ft_load_flags" }, {"default", "set default", 0, AV_OPT_TYPE_CONST, {FT_LOAD_DEFAULT}, INT_MIN, INT_MAX, 0, "ft_load_flags" }, {"no_scale", "set no_scale", 0, AV_OPT_TYPE_CONST, {FT_LOAD_NO_SCALE}, INT_MIN, INT_MAX, 0, "ft_load_flags" }, {"no_hinting", "set no_hinting", 0, AV_OPT_TYPE_CONST, {FT_LOAD_NO_HINTING}, INT_MIN, INT_MAX, 0, "ft_load_flags" }, {"render", "set render", 0, AV_OPT_TYPE_CONST, {FT_LOAD_RENDER}, INT_MIN, INT_MAX, 0, "ft_load_flags" }, {"no_bitmap", "set no_bitmap", 0, AV_OPT_TYPE_CONST, {FT_LOAD_NO_BITMAP}, INT_MIN, INT_MAX, 0, "ft_load_flags" }, {"vertical_layout", "set vertical_layout", 0, AV_OPT_TYPE_CONST, {FT_LOAD_VERTICAL_LAYOUT}, INT_MIN, INT_MAX, 0, "ft_load_flags" }, {"force_autohint", "set force_autohint", 0, AV_OPT_TYPE_CONST, {FT_LOAD_FORCE_AUTOHINT}, INT_MIN, INT_MAX, 0, "ft_load_flags" }, {"crop_bitmap", "set crop_bitmap", 0, AV_OPT_TYPE_CONST, {FT_LOAD_CROP_BITMAP}, INT_MIN, INT_MAX, 0, "ft_load_flags" }, {"pedantic", "set pedantic", 0, AV_OPT_TYPE_CONST, {FT_LOAD_PEDANTIC}, INT_MIN, INT_MAX, 0, "ft_load_flags" }, {"ignore_global_advance_width", "set ignore_global_advance_width", 0, AV_OPT_TYPE_CONST, {FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH}, INT_MIN, INT_MAX, 0, "ft_load_flags" }, {"no_recurse", "set no_recurse", 0, AV_OPT_TYPE_CONST, {FT_LOAD_NO_RECURSE}, INT_MIN, INT_MAX, 0, "ft_load_flags" }, {"ignore_transform", "set ignore_transform", 0, AV_OPT_TYPE_CONST, {FT_LOAD_IGNORE_TRANSFORM}, INT_MIN, INT_MAX, 0, "ft_load_flags" }, {"monochrome", "set monochrome", 0, AV_OPT_TYPE_CONST, {FT_LOAD_MONOCHROME}, INT_MIN, INT_MAX, 0, "ft_load_flags" }, {"linear_design", "set linear_design", 0, AV_OPT_TYPE_CONST, {FT_LOAD_LINEAR_DESIGN}, INT_MIN, INT_MAX, 0, "ft_load_flags" }, {"no_autohint", "set no_autohint", 0, AV_OPT_TYPE_CONST, {FT_LOAD_NO_AUTOHINT}, INT_MIN, INT_MAX, 0, "ft_load_flags" }, {NULL}, }; static const char *drawtext_get_name(void *ctx) { return "drawtext"; } static const AVClass drawtext_class = { "DrawTextContext", drawtext_get_name, drawtext_options }; #undef __FTERRORS_H__ #define FT_ERROR_START_LIST { #define FT_ERRORDEF(e, v, s) { (e), (s) }, #define FT_ERROR_END_LIST { 0, NULL } }; struct ft_error { int err; const char *err_msg; } static ft_errors[] = #include FT_ERRORS_H #define FT_ERRMSG(e) ft_errors[e].err_msg typedef struct { FT_Glyph *glyph; uint32_t code; FT_Bitmap bitmap; ///< array holding bitmaps of font FT_BBox bbox; int advance; int bitmap_left; int bitmap_top; } Glyph; static int glyph_cmp(void *key, const void *b) { const Glyph *a = key, *bb = b; int64_t diff = (int64_t)a->code - (int64_t)bb->code; return diff > 0 ? 1 : diff < 0 ? -1 : 0; } /** * Load glyphs corresponding to the UTF-32 codepoint code. */ static int load_glyph(AVFilterContext *ctx, Glyph **glyph_ptr, uint32_t code) { DrawTextContext *dtext = ctx->priv; Glyph *glyph; struct AVTreeNode *node = NULL; int ret; /* load glyph into dtext->face->glyph */ if (FT_Load_Char(dtext->face, code, dtext->ft_load_flags)) return AVERROR(EINVAL); /* save glyph */ if (!(glyph = av_mallocz(sizeof(*glyph))) || !(glyph->glyph = av_mallocz(sizeof(*glyph->glyph)))) { ret = AVERROR(ENOMEM); goto error; } glyph->code = code; if (FT_Get_Glyph(dtext->face->glyph, glyph->glyph)) { ret = AVERROR(EINVAL); goto error; } glyph->bitmap = dtext->face->glyph->bitmap; glyph->bitmap_left = dtext->face->glyph->bitmap_left; glyph->bitmap_top = dtext->face->glyph->bitmap_top; glyph->advance = dtext->face->glyph->advance.x >> 6; /* measure text height to calculate text_height (or the maximum text height) */ FT_Glyph_Get_CBox(*glyph->glyph, ft_glyph_bbox_pixels, &glyph->bbox); /* cache the newly created glyph */ if (!(node = av_mallocz(av_tree_node_size))) { ret = AVERROR(ENOMEM); goto error; } av_tree_insert(&dtext->glyphs, glyph, glyph_cmp, &node); if (glyph_ptr) *glyph_ptr = glyph; return 0; error: if (glyph) av_freep(&glyph->glyph); av_freep(&glyph); av_freep(&node); return ret; } static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque) { int err; DrawTextContext *dtext = ctx->priv; Glyph *glyph; dtext->class = &drawtext_class; av_opt_set_defaults(dtext); dtext->fontcolor_string = av_strdup("black"); dtext->boxcolor_string = av_strdup("white"); dtext->shadowcolor_string = av_strdup("black"); if ((err = (av_set_options_string(dtext, args, "=", ":"))) < 0) { av_log(ctx, AV_LOG_ERROR, "Error parsing options string: '%s'\n", args); return err; } if (!dtext->fontfile) { av_log(ctx, AV_LOG_ERROR, "No font filename provided\n"); return AVERROR(EINVAL); } if (dtext->textfile) { uint8_t *textbuf; size_t textbuf_size; if (dtext->text) { av_log(ctx, AV_LOG_ERROR, "Both text and text file provided. Please provide only one\n"); return AVERROR(EINVAL); } if ((err = av_file_map(dtext->textfile, &textbuf, &textbuf_size, 0, ctx)) < 0) { av_log(ctx, AV_LOG_ERROR, "The text file '%s' could not be read or is empty\n", dtext->textfile); return err; } if (!(dtext->text = av_malloc(textbuf_size+1))) return AVERROR(ENOMEM); memcpy(dtext->text, textbuf, textbuf_size); dtext->text[textbuf_size] = 0; av_file_unmap(textbuf, textbuf_size); } if (!dtext->text) { av_log(ctx, AV_LOG_ERROR, "Either text or a valid file must be provided\n"); return AVERROR(EINVAL); } if ((err = av_parse_color(dtext->fontcolor_rgba, dtext->fontcolor_string, -1, ctx))) { av_log(ctx, AV_LOG_ERROR, "Invalid font color '%s'\n", dtext->fontcolor_string); return err; } if ((err = av_parse_color(dtext->boxcolor_rgba, dtext->boxcolor_string, -1, ctx))) { av_log(ctx, AV_LOG_ERROR, "Invalid box color '%s'\n", dtext->boxcolor_string); return err; } if ((err = av_parse_color(dtext->shadowcolor_rgba, dtext->shadowcolor_string, -1, ctx))) { av_log(ctx, AV_LOG_ERROR, "Invalid shadow color '%s'\n", dtext->shadowcolor_string); return err; } if ((err = FT_Init_FreeType(&(dtext->library)))) { av_log(ctx, AV_LOG_ERROR, "Could not load FreeType: %s\n", FT_ERRMSG(err)); return AVERROR(EINVAL); } /* load the face, and set up the encoding, which is by default UTF-8 */ if ((err = FT_New_Face(dtext->library, dtext->fontfile, 0, &dtext->face))) { av_log(ctx, AV_LOG_ERROR, "Could not load fontface from file '%s': %s\n", dtext->fontfile, FT_ERRMSG(err)); return AVERROR(EINVAL); } if ((err = FT_Set_Pixel_Sizes(dtext->face, 0, dtext->fontsize))) { av_log(ctx, AV_LOG_ERROR, "Could not set font size to %d pixels: %s\n", dtext->fontsize, FT_ERRMSG(err)); return AVERROR(EINVAL); } dtext->use_kerning = FT_HAS_KERNING(dtext->face); /* load the fallback glyph with code 0 */ load_glyph(ctx, NULL, 0); /* set the tabsize in pixels */ if ((err = load_glyph(ctx, &glyph, ' ') < 0)) { av_log(ctx, AV_LOG_ERROR, "Could not set tabsize.\n"); return err; } dtext->tabsize *= glyph->advance; #if !HAVE_LOCALTIME_R av_log(ctx, AV_LOG_WARNING, "strftime() expansion unavailable!\n"); #endif return 0; } static int query_formats(AVFilterContext *ctx) { static const enum PixelFormat pix_fmts[] = { PIX_FMT_ARGB, PIX_FMT_RGBA, PIX_FMT_ABGR, PIX_FMT_BGRA, PIX_FMT_RGB24, PIX_FMT_BGR24, PIX_FMT_YUV420P, PIX_FMT_YUV444P, PIX_FMT_YUV422P, PIX_FMT_YUV411P, PIX_FMT_YUV410P, PIX_FMT_YUV440P, PIX_FMT_NONE }; avfilter_set_common_formats(ctx, avfilter_make_format_list(pix_fmts)); return 0; } static int glyph_enu_free(void *opaque, void *elem) { av_free(elem); return 0; } static av_cold void uninit(AVFilterContext *ctx) { DrawTextContext *dtext = ctx->priv; int i; av_freep(&dtext->fontfile); av_freep(&dtext->text); av_freep(&dtext->expanded_text); av_freep(&dtext->fontcolor_string); av_freep(&dtext->boxcolor_string); av_freep(&dtext->positions); av_freep(&dtext->shadowcolor_string); av_tree_enumerate(dtext->glyphs, NULL, NULL, glyph_enu_free); av_tree_destroy(dtext->glyphs); dtext->glyphs = 0; FT_Done_Face(dtext->face); FT_Done_FreeType(dtext->library); for (i = 0; i < 4; i++) { av_freep(&dtext->box_line[i]); dtext->pixel_step[i] = 0; } } static int config_input(AVFilterLink *inlink) { DrawTextContext *dtext = inlink->dst->priv; const AVPixFmtDescriptor *pix_desc = &av_pix_fmt_descriptors[inlink->format]; int ret; dtext->hsub = pix_desc->log2_chroma_w; dtext->vsub = pix_desc->log2_chroma_h; if ((ret = ff_fill_line_with_color(dtext->box_line, dtext->pixel_step, inlink->w, dtext->boxcolor, inlink->format, dtext->boxcolor_rgba, &dtext->is_packed_rgb, dtext->rgba_map)) < 0) return ret; if (!dtext->is_packed_rgb) { uint8_t *rgba = dtext->fontcolor_rgba; dtext->fontcolor[0] = RGB_TO_Y_CCIR(rgba[0], rgba[1], rgba[2]); dtext->fontcolor[1] = RGB_TO_U_CCIR(rgba[0], rgba[1], rgba[2], 0); dtext->fontcolor[2] = RGB_TO_V_CCIR(rgba[0], rgba[1], rgba[2], 0); dtext->fontcolor[3] = rgba[3]; rgba = dtext->shadowcolor_rgba; dtext->shadowcolor[0] = RGB_TO_Y_CCIR(rgba[0], rgba[1], rgba[2]); dtext->shadowcolor[1] = RGB_TO_U_CCIR(rgba[0], rgba[1], rgba[2], 0); dtext->shadowcolor[2] = RGB_TO_V_CCIR(rgba[0], rgba[1], rgba[2], 0); dtext->shadowcolor[3] = rgba[3]; } return 0; } #define GET_BITMAP_VAL(r, c) \ bitmap->pixel_mode == FT_PIXEL_MODE_MONO ? \ (bitmap->buffer[(r) * bitmap->pitch + ((c)>>3)] & (0x80 >> ((c)&7))) * 255 : \ bitmap->buffer[(r) * bitmap->pitch + (c)] #define SET_PIXEL_YUV(picref, yuva_color, val, x, y, hsub, vsub) { \ luma_pos = ((x) ) + ((y) ) * picref->linesize[0]; \ alpha = yuva_color[3] * (val) * 129; \ picref->data[0][luma_pos] = (alpha * yuva_color[0] + (255*255*129 - alpha) * picref->data[0][luma_pos] ) >> 23; \ if (((x) & ((1<<(hsub)) - 1)) == 0 && ((y) & ((1<<(vsub)) - 1)) == 0) {\ chroma_pos1 = ((x) >> (hsub)) + ((y) >> (vsub)) * picref->linesize[1]; \ chroma_pos2 = ((x) >> (hsub)) + ((y) >> (vsub)) * picref->linesize[2]; \ picref->data[1][chroma_pos1] = (alpha * yuva_color[1] + (255*255*129 - alpha) * picref->data[1][chroma_pos1]) >> 23; \ picref->data[2][chroma_pos2] = (alpha * yuva_color[2] + (255*255*129 - alpha) * picref->data[2][chroma_pos2]) >> 23; \ }\ } static inline int draw_glyph_yuv(AVFilterBufferRef *picref, FT_Bitmap *bitmap, unsigned int x, unsigned int y, unsigned int width, unsigned int height, const uint8_t yuva_color[4], int hsub, int vsub) { int r, c, alpha; unsigned int luma_pos, chroma_pos1, chroma_pos2; uint8_t src_val; for (r = 0; r < bitmap->rows && r+y < height; r++) { for (c = 0; c < bitmap->width && c+x < width; c++) { /* get intensity value in the glyph bitmap (source) */ src_val = GET_BITMAP_VAL(r, c); if (!src_val) continue; SET_PIXEL_YUV(picref, yuva_color, src_val, c+x, y+r, hsub, vsub); } } return 0; } #define SET_PIXEL_RGB(picref, rgba_color, val, x, y, pixel_step, r_off, g_off, b_off, a_off) { \ p = picref->data[0] + (x) * pixel_step + ((y) * picref->linesize[0]); \ alpha = rgba_color[3] * (val) * 129; \ *(p+r_off) = (alpha * rgba_color[0] + (255*255*129 - alpha) * *(p+r_off)) >> 23; \ *(p+g_off) = (alpha * rgba_color[1] + (255*255*129 - alpha) * *(p+g_off)) >> 23; \ *(p+b_off) = (alpha * rgba_color[2] + (255*255*129 - alpha) * *(p+b_off)) >> 23; \ } static inline int draw_glyph_rgb(AVFilterBufferRef *picref, FT_Bitmap *bitmap, unsigned int x, unsigned int y, unsigned int width, unsigned int height, int pixel_step, const uint8_t rgba_color[4], const uint8_t rgba_map[4]) { int r, c, alpha; uint8_t *p; uint8_t src_val; for (r = 0; r < bitmap->rows && r+y < height; r++) { for (c = 0; c < bitmap->width && c+x < width; c++) { /* get intensity value in the glyph bitmap (source) */ src_val = GET_BITMAP_VAL(r, c); if (!src_val) continue; SET_PIXEL_RGB(picref, rgba_color, src_val, c+x, y+r, pixel_step, rgba_map[0], rgba_map[1], rgba_map[2], rgba_map[3]); } } return 0; } static inline void drawbox(AVFilterBufferRef *picref, unsigned int x, unsigned int y, unsigned int width, unsigned int height, uint8_t *line[4], int pixel_step[4], uint8_t color[4], int hsub, int vsub, int is_rgba_packed, uint8_t rgba_map[4]) { int i, j, alpha; if (color[3] != 0xFF) { if (is_rgba_packed) { uint8_t *p; for (j = 0; j < height; j++) for (i = 0; i < width; i++) SET_PIXEL_RGB(picref, color, 255, i+x, y+j, pixel_step[0], rgba_map[0], rgba_map[1], rgba_map[2], rgba_map[3]); } else { unsigned int luma_pos, chroma_pos1, chroma_pos2; for (j = 0; j < height; j++) for (i = 0; i < width; i++) SET_PIXEL_YUV(picref, color, 255, i+x, y+j, hsub, vsub); } } else { ff_draw_rectangle(picref->data, picref->linesize, line, pixel_step, hsub, vsub, x, y, width, height); } } static inline int is_newline(uint32_t c) { return (c == '\n' || c == '\r' || c == '\f' || c == '\v'); } static int draw_glyphs(DrawTextContext *dtext, AVFilterBufferRef *picref, int width, int height, const uint8_t rgbcolor[4], const uint8_t yuvcolor[4], int x, int y) { char *text = HAVE_LOCALTIME_R ? dtext->expanded_text : dtext->text; uint32_t code = 0; int i; uint8_t *p; Glyph *glyph = NULL; for (i = 0, p = text; *p; i++) { Glyph dummy = { 0 }; GET_UTF8(code, *p++, continue;); /* skip new line chars, just go to new line */ if (code == '\n' || code == '\r' || code == '\t') continue; dummy.code = code; glyph = av_tree_find(dtext->glyphs, &dummy, (void *)glyph_cmp, NULL); if (glyph->bitmap.pixel_mode != FT_PIXEL_MODE_MONO && glyph->bitmap.pixel_mode != FT_PIXEL_MODE_GRAY) return AVERROR(EINVAL); if (dtext->is_packed_rgb) { draw_glyph_rgb(picref, &glyph->bitmap, dtext->positions[i].x+x, dtext->positions[i].y+y, width, height, dtext->pixel_step[0], rgbcolor, dtext->rgba_map); } else { draw_glyph_yuv(picref, &glyph->bitmap, dtext->positions[i].x+x, dtext->positions[i].y+y, width, height, yuvcolor, dtext->hsub, dtext->vsub); } } return 0; } static int draw_text(AVFilterContext *ctx, AVFilterBufferRef *picref, int width, int height) { DrawTextContext *dtext = ctx->priv; uint32_t code = 0, prev_code = 0; int x = 0, y = 0, i = 0, ret; int text_height, baseline; char *text = dtext->text; uint8_t *p; int str_w = 0, len; int y_min = 32000, y_max = -32000; FT_Vector delta; Glyph *glyph = NULL, *prev_glyph = NULL; Glyph dummy = { 0 }; #if HAVE_LOCALTIME_R time_t now = time(0); struct tm ltime; uint8_t *buf = dtext->expanded_text; int buf_size = dtext->expanded_text_size; if (!buf) { buf_size = 2*strlen(dtext->text)+1; buf = av_malloc(buf_size); } localtime_r(&now, <ime); do { *buf = 1; if (strftime(buf, buf_size, dtext->text, <ime) != 0 || *buf == 0) break; buf_size *= 2; } while ((buf = av_realloc(buf, buf_size))); if (!buf) return AVERROR(ENOMEM); text = dtext->expanded_text = buf; dtext->expanded_text_size = buf_size; #endif if ((len = strlen(text)) > dtext->nb_positions) { if (!(dtext->positions = av_realloc(dtext->positions, len*sizeof(*dtext->positions)))) return AVERROR(ENOMEM); dtext->nb_positions = len; } x = dtext->x; y = dtext->y; /* load and cache glyphs */ for (i = 0, p = text; *p; i++) { GET_UTF8(code, *p++, continue;); /* get glyph */ dummy.code = code; glyph = av_tree_find(dtext->glyphs, &dummy, glyph_cmp, NULL); if (!glyph) load_glyph(ctx, &glyph, code); y_min = FFMIN(glyph->bbox.yMin, y_min); y_max = FFMAX(glyph->bbox.yMax, y_max); } text_height = y_max - y_min; baseline = y_max; /* compute and save position for each glyph */ glyph = NULL; for (i = 0, p = text; *p; i++) { GET_UTF8(code, *p++, continue;); /* skip the \n in the sequence \r\n */ if (prev_code == '\r' && code == '\n') continue; prev_code = code; if (is_newline(code)) { str_w = FFMAX(str_w, x - dtext->x); y += text_height; x = dtext->x; continue; } /* get glyph */ prev_glyph = glyph; dummy.code = code; glyph = av_tree_find(dtext->glyphs, &dummy, glyph_cmp, NULL); /* kerning */ if (dtext->use_kerning && prev_glyph && glyph->code) { FT_Get_Kerning(dtext->face, prev_glyph->code, glyph->code, ft_kerning_default, &delta); x += delta.x >> 6; } if (x + glyph->bbox.xMax >= width) { str_w = FFMAX(str_w, x - dtext->x); y += text_height; x = dtext->x; } /* save position */ dtext->positions[i].x = x + glyph->bitmap_left; dtext->positions[i].y = y - glyph->bitmap_top + baseline; if (code == '\t') x = (x / dtext->tabsize + 1)*dtext->tabsize; else x += glyph->advance; } str_w = FFMIN(width - dtext->x - 1, FFMAX(str_w, x - dtext->x)); y = FFMIN(y + text_height, height - 1); /* draw box */ if (dtext->draw_box) drawbox(picref, dtext->x, dtext->y, str_w, y-dtext->y, dtext->box_line, dtext->pixel_step, dtext->boxcolor, dtext->hsub, dtext->vsub, dtext->is_packed_rgb, dtext->rgba_map); if (dtext->shadowx || dtext->shadowy) { if ((ret = draw_glyphs(dtext, picref, width, height, dtext->shadowcolor_rgba, dtext->shadowcolor, dtext->shadowx, dtext->shadowy)) < 0) return ret; } if ((ret = draw_glyphs(dtext, picref, width, height, dtext->fontcolor_rgba, dtext->fontcolor, 0, 0)) < 0) return ret; return 0; } static void null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir) { } static void end_frame(AVFilterLink *inlink) { AVFilterLink *outlink = inlink->dst->outputs[0]; AVFilterBufferRef *picref = inlink->cur_buf; draw_text(inlink->dst, picref, picref->video->w, picref->video->h); avfilter_draw_slice(outlink, 0, picref->video->h, 1); avfilter_end_frame(outlink); } AVFilter avfilter_vf_drawtext = { .name = "drawtext", .description = NULL_IF_CONFIG_SMALL("Draw text on top of video frames using libfreetype library."), .priv_size = sizeof(DrawTextContext), .init = init, .uninit = uninit, .query_formats = query_formats, .inputs = (AVFilterPad[]) {{ .name = "default", .type = AVMEDIA_TYPE_VIDEO, .get_video_buffer = avfilter_null_get_video_buffer, .start_frame = avfilter_null_start_frame, .draw_slice = null_draw_slice, .end_frame = end_frame, .config_props = config_input, .min_perms = AV_PERM_WRITE | AV_PERM_READ, .rej_perms = AV_PERM_PRESERVE }, { .name = NULL}}, .outputs = (AVFilterPad[]) {{ .name = "default", .type = AVMEDIA_TYPE_VIDEO, }, { .name = NULL}}, };