| /* |
| * Copyright (c) 2011 Stefano Sabatini |
| * Copyright (c) 2010 S.N. Hemanth Meenakshisundaram |
| * Copyright (c) 2003 Gustavo Sverzut Barbieri <gsbarbieri@yahoo.com.br> |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg 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. |
| * |
| * FFmpeg 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 FFmpeg; 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 vhook/drawtext.c |
| * filter by Gustavo Sverzut Barbieri |
| */ |
| |
| #include <sys/time.h> |
| #include <time.h> |
| |
| #include "config.h" |
| #include "libavutil/avstring.h" |
| #include "libavutil/file.h" |
| #include "libavutil/eval.h" |
| #include "libavutil/opt.h" |
| #include "libavutil/random_seed.h" |
| #include "libavutil/parseutils.h" |
| #include "libavutil/timecode.h" |
| #include "libavutil/tree.h" |
| #include "libavutil/lfg.h" |
| #include "avfilter.h" |
| #include "drawutils.h" |
| #include "video.h" |
| |
| #undef time |
| |
| #include <ft2build.h> |
| #include <freetype/config/ftheader.h> |
| #include FT_FREETYPE_H |
| #include FT_GLYPH_H |
| #if CONFIG_FONTCONFIG |
| #include <fontconfig/fontconfig.h> |
| #endif |
| |
| static const char *const var_names[] = { |
| "dar", |
| "hsub", "vsub", |
| "line_h", "lh", ///< line height, same as max_glyph_h |
| "main_h", "h", "H", ///< height of the input video |
| "main_w", "w", "W", ///< width of the input video |
| "max_glyph_a", "ascent", ///< max glyph ascent |
| "max_glyph_d", "descent", ///< min glyph descent |
| "max_glyph_h", ///< max glyph height |
| "max_glyph_w", ///< max glyph width |
| "n", ///< number of frame |
| "sar", |
| "t", ///< timestamp expressed in seconds |
| "text_h", "th", ///< height of the rendered text |
| "text_w", "tw", ///< width of the rendered text |
| "x", |
| "y", |
| NULL |
| }; |
| |
| static const char *const fun2_names[] = { |
| "rand" |
| }; |
| |
| static double drand(void *opaque, double min, double max) |
| { |
| return min + (max-min) / UINT_MAX * av_lfg_get(opaque); |
| } |
| |
| typedef double (*eval_func2)(void *, double a, double b); |
| |
| static const eval_func2 fun2[] = { |
| drand, |
| NULL |
| }; |
| |
| enum var_name { |
| VAR_DAR, |
| VAR_HSUB, VAR_VSUB, |
| VAR_LINE_H, VAR_LH, |
| VAR_MAIN_H, VAR_h, VAR_H, |
| VAR_MAIN_W, VAR_w, VAR_W, |
| VAR_MAX_GLYPH_A, VAR_ASCENT, |
| VAR_MAX_GLYPH_D, VAR_DESCENT, |
| VAR_MAX_GLYPH_H, |
| VAR_MAX_GLYPH_W, |
| VAR_N, |
| VAR_SAR, |
| VAR_T, |
| VAR_TEXT_H, VAR_TH, |
| VAR_TEXT_W, VAR_TW, |
| VAR_X, |
| VAR_Y, |
| VAR_VARS_NB |
| }; |
| |
| typedef struct { |
| const AVClass *class; |
| int reinit; ///< tells if the filter is being reinited |
| 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 |
| int x; ///< x position to start drawing text |
| int y; ///< y position to start drawing text |
| int max_glyph_w; ///< max glyph width |
| int max_glyph_h; ///< max glyph height |
| 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 |
| |
| short int draw_box; ///< draw box around text - true or false |
| int use_kerning; ///< font kerning is used - true/false |
| int tabsize; ///< tab size |
| int fix_bounds; ///< do we let it go out of frame bounds - t/f |
| |
| FFDrawContext dc; |
| FFDrawColor fontcolor; ///< foreground color |
| FFDrawColor shadowcolor; ///< shadow color |
| FFDrawColor boxcolor; ///< background color |
| |
| 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 |
| char *x_expr; ///< expression for x position |
| char *y_expr; ///< expression for y position |
| AVExpr *x_pexpr, *y_pexpr; ///< parsed expressions for x and y |
| int64_t basetime; ///< base pts time in the real world for display |
| double var_values[VAR_VARS_NB]; |
| char *draw_expr; ///< expression for draw |
| AVExpr *draw_pexpr; ///< parsed expression for draw |
| int draw; ///< set to zero to prevent drawing |
| AVLFG prng; ///< random |
| char *tc_opt_string; ///< specified timecode option string |
| AVRational tc_rate; ///< frame rate for timecode |
| AVTimecode tc; ///< timecode context |
| int tc24hmax; ///< 1 if timecode is wrapped to 24 hours, 0 otherwise |
| int frame_id; |
| } 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="black"}, CHAR_MIN, CHAR_MAX }, |
| {"boxcolor", "set box color", OFFSET(boxcolor_string), AV_OPT_TYPE_STRING, {.str="white"}, CHAR_MIN, CHAR_MAX }, |
| {"shadowcolor", "set shadow color", OFFSET(shadowcolor_string), AV_OPT_TYPE_STRING, {.str="black"}, 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=0}, 0, INT_MAX }, |
| {"x", "set x expression", OFFSET(x_expr), AV_OPT_TYPE_STRING, {.str="0"}, CHAR_MIN, CHAR_MAX }, |
| {"y", "set y expression", OFFSET(y_expr), AV_OPT_TYPE_STRING, {.str="0"}, CHAR_MIN, CHAR_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 }, |
| {"basetime", "set base time", OFFSET(basetime), AV_OPT_TYPE_INT64, {.dbl=AV_NOPTS_VALUE}, INT64_MIN, INT64_MAX }, |
| {"draw", "if false do not draw", OFFSET(draw_expr), AV_OPT_TYPE_STRING, {.str="1"}, CHAR_MIN, CHAR_MAX }, |
| {"timecode", "set initial timecode", OFFSET(tc_opt_string), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX }, |
| {"tc24hmax", "set 24 hours max (timecode only)", OFFSET(tc24hmax), AV_OPT_TYPE_INT, {.dbl=0}, 0, 1 }, |
| {"timecode_rate", "set rate (timecode only)", OFFSET(tc_rate), AV_OPT_TYPE_RATIONAL, {.dbl=0}, 0, INT_MAX }, |
| {"r", "set rate (timecode only)", OFFSET(tc_rate), AV_OPT_TYPE_RATIONAL, {.dbl=0}, 0, INT_MAX }, |
| {"rate", "set rate (timecode only)", OFFSET(tc_rate), AV_OPT_TYPE_RATIONAL, {.dbl=0}, 0, INT_MAX }, |
| {"fix_bounds", "if true, check and fix text coords to avoid clipping", |
| OFFSET(fix_bounds), AV_OPT_TYPE_INT, {.dbl=1}, 0, 1 }, |
| |
| /* 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, {.dbl=FT_LOAD_DEFAULT}, INT_MIN, INT_MAX, 0, "ft_load_flags" }, |
| {"no_scale", "set no_scale", 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_NO_SCALE}, INT_MIN, INT_MAX, 0, "ft_load_flags" }, |
| {"no_hinting", "set no_hinting", 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_NO_HINTING}, INT_MIN, INT_MAX, 0, "ft_load_flags" }, |
| {"render", "set render", 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_RENDER}, INT_MIN, INT_MAX, 0, "ft_load_flags" }, |
| {"no_bitmap", "set no_bitmap", 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_NO_BITMAP}, INT_MIN, INT_MAX, 0, "ft_load_flags" }, |
| {"vertical_layout", "set vertical_layout", 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_VERTICAL_LAYOUT}, INT_MIN, INT_MAX, 0, "ft_load_flags" }, |
| {"force_autohint", "set force_autohint", 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_FORCE_AUTOHINT}, INT_MIN, INT_MAX, 0, "ft_load_flags" }, |
| {"crop_bitmap", "set crop_bitmap", 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_CROP_BITMAP}, INT_MIN, INT_MAX, 0, "ft_load_flags" }, |
| {"pedantic", "set pedantic", 0, AV_OPT_TYPE_CONST, {.dbl=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, {.dbl=FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH}, INT_MIN, INT_MAX, 0, "ft_load_flags" }, |
| {"no_recurse", "set no_recurse", 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_NO_RECURSE}, INT_MIN, INT_MAX, 0, "ft_load_flags" }, |
| {"ignore_transform", "set ignore_transform", 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_IGNORE_TRANSFORM}, INT_MIN, INT_MAX, 0, "ft_load_flags" }, |
| {"monochrome", "set monochrome", 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_MONOCHROME}, INT_MIN, INT_MAX, 0, "ft_load_flags" }, |
| {"linear_design", "set linear_design", 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_LINEAR_DESIGN}, INT_MIN, INT_MAX, 0, "ft_load_flags" }, |
| {"no_autohint", "set no_autohint", 0, AV_OPT_TYPE_CONST, {.dbl=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 int load_font_file(AVFilterContext *ctx, const char *path, int index, |
| const char **error) |
| { |
| DrawTextContext *dtext = ctx->priv; |
| int err; |
| |
| err = FT_New_Face(dtext->library, path, index, &dtext->face); |
| if (err) { |
| *error = FT_ERRMSG(err); |
| return AVERROR(EINVAL); |
| } |
| return 0; |
| } |
| |
| #if CONFIG_FONTCONFIG |
| static int load_font_fontconfig(AVFilterContext *ctx, const char **error) |
| { |
| DrawTextContext *dtext = ctx->priv; |
| FcConfig *fontconfig; |
| FcPattern *pattern, *fpat; |
| FcResult result = FcResultMatch; |
| FcChar8 *filename; |
| int err, index; |
| double size; |
| |
| fontconfig = FcInitLoadConfigAndFonts(); |
| if (!fontconfig) { |
| *error = "impossible to init fontconfig\n"; |
| return AVERROR(EINVAL); |
| } |
| pattern = FcNameParse(dtext->fontfile ? dtext->fontfile : |
| (uint8_t *)(intptr_t)"default"); |
| if (!pattern) { |
| *error = "could not parse fontconfig pattern"; |
| return AVERROR(EINVAL); |
| } |
| if (!FcConfigSubstitute(fontconfig, pattern, FcMatchPattern)) { |
| *error = "could not substitue fontconfig options"; /* very unlikely */ |
| return AVERROR(EINVAL); |
| } |
| FcDefaultSubstitute(pattern); |
| fpat = FcFontMatch(fontconfig, pattern, &result); |
| if (!fpat || result != FcResultMatch) { |
| *error = "impossible to find a matching font"; |
| return AVERROR(EINVAL); |
| } |
| if (FcPatternGetString (fpat, FC_FILE, 0, &filename) != FcResultMatch || |
| FcPatternGetInteger(fpat, FC_INDEX, 0, &index ) != FcResultMatch || |
| FcPatternGetDouble (fpat, FC_SIZE, 0, &size ) != FcResultMatch) { |
| *error = "impossible to find font information"; |
| return AVERROR(EINVAL); |
| } |
| av_log(ctx, AV_LOG_INFO, "Using \"%s\"\n", filename); |
| if (!dtext->fontsize) |
| dtext->fontsize = size + 0.5; |
| err = load_font_file(ctx, filename, index, error); |
| if (err) |
| return err; |
| FcPatternDestroy(fpat); |
| FcPatternDestroy(pattern); |
| FcConfigDestroy(fontconfig); |
| return 0; |
| } |
| #endif |
| |
| static int load_font(AVFilterContext *ctx) |
| { |
| DrawTextContext *dtext = ctx->priv; |
| int err; |
| const char *error = "unknown error\n"; |
| |
| /* load the face, and set up the encoding, which is by default UTF-8 */ |
| err = load_font_file(ctx, dtext->fontfile, 0, &error); |
| if (!err) |
| return 0; |
| #if CONFIG_FONTCONFIG |
| err = load_font_fontconfig(ctx, &error); |
| if (!err) |
| return 0; |
| #endif |
| av_log(ctx, AV_LOG_ERROR, "Could not load font \"%s\": %s\n", |
| dtext->fontfile, error); |
| return err; |
| } |
| |
| 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); |
| |
| 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 && !CONFIG_FONTCONFIG) { |
| 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->tc_opt_string) { |
| int ret = av_timecode_init_from_string(&dtext->tc, dtext->tc_rate, |
| dtext->tc_opt_string, ctx); |
| if (ret < 0) |
| return ret; |
| if (dtext->tc24hmax) |
| dtext->tc.flags |= AV_TIMECODE_FLAG_24HOURSMAX; |
| if (!dtext->text) |
| dtext->text = av_strdup(""); |
| } |
| |
| if (!dtext->text) { |
| av_log(ctx, AV_LOG_ERROR, |
| "Either text, a valid file or a timecode 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); |
| } |
| |
| err = load_font(ctx); |
| if (err) |
| return err; |
| if (!dtext->fontsize) |
| dtext->fontsize = 16; |
| 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; |
| |
| return 0; |
| } |
| |
| static int query_formats(AVFilterContext *ctx) |
| { |
| avfilter_set_common_pixel_formats(ctx, ff_draw_supported_pixel_formats(0)); |
| return 0; |
| } |
| |
| static int glyph_enu_free(void *opaque, void *elem) |
| { |
| Glyph *glyph = elem; |
| |
| FT_Done_Glyph(*glyph->glyph); |
| av_freep(&glyph->glyph); |
| av_free(elem); |
| return 0; |
| } |
| |
| static av_cold void uninit(AVFilterContext *ctx) |
| { |
| DrawTextContext *dtext = ctx->priv; |
| |
| av_expr_free(dtext->x_pexpr); dtext->x_pexpr = NULL; |
| av_expr_free(dtext->y_pexpr); dtext->y_pexpr = NULL; |
| av_expr_free(dtext->draw_pexpr); dtext->draw_pexpr = NULL; |
| |
| av_freep(&dtext->boxcolor_string); |
| av_freep(&dtext->expanded_text); |
| av_freep(&dtext->fontcolor_string); |
| av_freep(&dtext->fontfile); |
| av_freep(&dtext->shadowcolor_string); |
| av_freep(&dtext->text); |
| av_freep(&dtext->x_expr); |
| av_freep(&dtext->y_expr); |
| av_freep(&dtext->draw_expr); |
| |
| av_freep(&dtext->positions); |
| dtext->nb_positions = 0; |
| |
| av_tree_enumerate(dtext->glyphs, NULL, NULL, glyph_enu_free); |
| av_tree_destroy(dtext->glyphs); |
| dtext->glyphs = NULL; |
| |
| FT_Done_Face(dtext->face); |
| FT_Done_FreeType(dtext->library); |
| } |
| |
| static inline int is_newline(uint32_t c) |
| { |
| return c == '\n' || c == '\r' || c == '\f' || c == '\v'; |
| } |
| |
| static int config_input(AVFilterLink *inlink) |
| { |
| AVFilterContext *ctx = inlink->dst; |
| DrawTextContext *dtext = ctx->priv; |
| int ret; |
| |
| ff_draw_init(&dtext->dc, inlink->format, 0); |
| ff_draw_color(&dtext->dc, &dtext->fontcolor, dtext->fontcolor.rgba); |
| ff_draw_color(&dtext->dc, &dtext->shadowcolor, dtext->shadowcolor.rgba); |
| ff_draw_color(&dtext->dc, &dtext->boxcolor, dtext->boxcolor.rgba); |
| |
| dtext->var_values[VAR_w] = dtext->var_values[VAR_W] = dtext->var_values[VAR_MAIN_W] = inlink->w; |
| dtext->var_values[VAR_h] = dtext->var_values[VAR_H] = dtext->var_values[VAR_MAIN_H] = inlink->h; |
| dtext->var_values[VAR_SAR] = inlink->sample_aspect_ratio.num ? av_q2d(inlink->sample_aspect_ratio) : 1; |
| dtext->var_values[VAR_DAR] = (double)inlink->w / inlink->h * dtext->var_values[VAR_SAR]; |
| dtext->var_values[VAR_HSUB] = 1 << dtext->dc.hsub_max; |
| dtext->var_values[VAR_VSUB] = 1 << dtext->dc.vsub_max; |
| dtext->var_values[VAR_X] = NAN; |
| dtext->var_values[VAR_Y] = NAN; |
| if (!dtext->reinit) |
| dtext->var_values[VAR_N] = 0; |
| dtext->var_values[VAR_T] = NAN; |
| |
| av_lfg_init(&dtext->prng, av_get_random_seed()); |
| |
| if ((ret = av_expr_parse(&dtext->x_pexpr, dtext->x_expr, var_names, |
| NULL, NULL, fun2_names, fun2, 0, ctx)) < 0 || |
| (ret = av_expr_parse(&dtext->y_pexpr, dtext->y_expr, var_names, |
| NULL, NULL, fun2_names, fun2, 0, ctx)) < 0 || |
| (ret = av_expr_parse(&dtext->draw_pexpr, dtext->draw_expr, var_names, |
| NULL, NULL, fun2_names, fun2, 0, ctx)) < 0) |
| |
| return AVERROR(EINVAL); |
| |
| return 0; |
| } |
| |
| static int command(AVFilterContext *ctx, const char *cmd, const char *arg, char *res, int res_len, int flags) |
| { |
| DrawTextContext *dtext = ctx->priv; |
| |
| if (!strcmp(cmd, "reinit")) { |
| int ret; |
| uninit(ctx); |
| dtext->reinit = 1; |
| if ((ret = init(ctx, arg, NULL)) < 0) |
| return ret; |
| return config_input(ctx->inputs[0]); |
| } |
| |
| return AVERROR(ENOSYS); |
| } |
| |
| static int draw_glyphs(DrawTextContext *dtext, AVFilterBufferRef *picref, |
| int width, int height, const uint8_t rgbcolor[4], FFDrawColor *color, int x, int y) |
| { |
| char *text = dtext->expanded_text; |
| uint32_t code = 0; |
| int i, x1, y1; |
| 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); |
| |
| x1 = dtext->positions[i].x+dtext->x+x; |
| y1 = dtext->positions[i].y+dtext->y+y; |
| |
| ff_blend_mask(&dtext->dc, color, |
| picref->data, picref->linesize, width, height, |
| glyph->bitmap.buffer, glyph->bitmap.pitch, |
| glyph->bitmap.width, glyph->bitmap.rows, |
| glyph->bitmap.pixel_mode == FT_PIXEL_MODE_MONO ? 0 : 3, |
| 0, x1, y1); |
| } |
| |
| 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 max_text_line_w = 0, len; |
| int box_w, box_h; |
| char *text = dtext->text; |
| uint8_t *p; |
| int y_min = 32000, y_max = -32000; |
| int x_min = 32000, x_max = -32000; |
| FT_Vector delta; |
| Glyph *glyph = NULL, *prev_glyph = NULL; |
| Glyph dummy = { 0 }; |
| |
| time_t now = time(0); |
| struct tm ltime; |
| uint8_t *buf = dtext->expanded_text; |
| int buf_size = dtext->expanded_text_size; |
| |
| if(dtext->basetime != AV_NOPTS_VALUE) |
| now= picref->pts*av_q2d(ctx->inputs[0]->time_base) + dtext->basetime/1000000; |
| |
| if (!buf) { |
| buf_size = 2*strlen(dtext->text)+1; |
| buf = av_malloc(buf_size); |
| } |
| |
| #if HAVE_LOCALTIME_R |
| localtime_r(&now, <ime); |
| #else |
| if(strchr(dtext->text, '%')) |
| ltime= *localtime(&now); |
| #endif |
| |
| 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 (dtext->tc_opt_string) { |
| char tcbuf[AV_TIMECODE_STR_SIZE]; |
| av_timecode_make_string(&dtext->tc, tcbuf, dtext->frame_id++); |
| buf = av_asprintf("%s%s", dtext->text, tcbuf); |
| } |
| |
| if (!buf) |
| return AVERROR(ENOMEM); |
| text = dtext->expanded_text = buf; |
| dtext->expanded_text_size = buf_size; |
| 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 = 0; |
| y = 0; |
| |
| /* 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); |
| x_min = FFMIN(glyph->bbox.xMin, x_min); |
| x_max = FFMAX(glyph->bbox.xMax, x_max); |
| } |
| dtext->max_glyph_h = y_max - y_min; |
| dtext->max_glyph_w = x_max - x_min; |
| |
| /* 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)) { |
| max_text_line_w = FFMAX(max_text_line_w, x); |
| y += dtext->max_glyph_h; |
| x = 0; |
| 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; |
| } |
| |
| /* save position */ |
| dtext->positions[i].x = x + glyph->bitmap_left; |
| dtext->positions[i].y = y - glyph->bitmap_top + y_max; |
| if (code == '\t') x = (x / dtext->tabsize + 1)*dtext->tabsize; |
| else x += glyph->advance; |
| } |
| |
| max_text_line_w = FFMAX(x, max_text_line_w); |
| |
| dtext->var_values[VAR_TW] = dtext->var_values[VAR_TEXT_W] = max_text_line_w; |
| dtext->var_values[VAR_TH] = dtext->var_values[VAR_TEXT_H] = y + dtext->max_glyph_h; |
| |
| dtext->var_values[VAR_MAX_GLYPH_W] = dtext->max_glyph_w; |
| dtext->var_values[VAR_MAX_GLYPH_H] = dtext->max_glyph_h; |
| dtext->var_values[VAR_MAX_GLYPH_A] = dtext->var_values[VAR_ASCENT ] = y_max; |
| dtext->var_values[VAR_MAX_GLYPH_D] = dtext->var_values[VAR_DESCENT] = y_min; |
| |
| dtext->var_values[VAR_LINE_H] = dtext->var_values[VAR_LH] = dtext->max_glyph_h; |
| |
| dtext->x = dtext->var_values[VAR_X] = av_expr_eval(dtext->x_pexpr, dtext->var_values, &dtext->prng); |
| dtext->y = dtext->var_values[VAR_Y] = av_expr_eval(dtext->y_pexpr, dtext->var_values, &dtext->prng); |
| dtext->x = dtext->var_values[VAR_X] = av_expr_eval(dtext->x_pexpr, dtext->var_values, &dtext->prng); |
| dtext->draw = av_expr_eval(dtext->draw_pexpr, dtext->var_values, &dtext->prng); |
| |
| if(!dtext->draw) |
| return 0; |
| |
| box_w = FFMIN(width - 1 , max_text_line_w); |
| box_h = FFMIN(height - 1, y + dtext->max_glyph_h); |
| |
| /* draw box */ |
| if (dtext->draw_box) |
| ff_blend_rectangle(&dtext->dc, &dtext->boxcolor, |
| picref->data, picref->linesize, width, height, |
| dtext->x, dtext->y, box_w, box_h); |
| |
| 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) |
| { |
| AVFilterContext *ctx = inlink->dst; |
| AVFilterLink *outlink = ctx->outputs[0]; |
| DrawTextContext *dtext = ctx->priv; |
| AVFilterBufferRef *picref = inlink->cur_buf; |
| |
| dtext->var_values[VAR_T] = picref->pts == AV_NOPTS_VALUE ? |
| NAN : picref->pts * av_q2d(inlink->time_base); |
| |
| draw_text(ctx, picref, picref->video->w, picref->video->h); |
| |
| av_log(ctx, AV_LOG_DEBUG, "n:%d t:%f text_w:%d text_h:%d x:%d y:%d\n", |
| (int)dtext->var_values[VAR_N], dtext->var_values[VAR_T], |
| (int)dtext->var_values[VAR_TEXT_W], (int)dtext->var_values[VAR_TEXT_H], |
| dtext->x, dtext->y); |
| |
| dtext->var_values[VAR_N] += 1.0; |
| |
| 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 = (const AVFilterPad[]) {{ .name = "default", |
| .type = AVMEDIA_TYPE_VIDEO, |
| .get_video_buffer = ff_null_get_video_buffer, |
| .start_frame = ff_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 = (const AVFilterPad[]) {{ .name = "default", |
| .type = AVMEDIA_TYPE_VIDEO, }, |
| { .name = NULL}}, |
| .process_command = command, |
| }; |
