/* * Copyright (c) 2011 Stefano Sabatini * Copyright (c) 2010 S.N. Hemanth Meenakshisundaram * Copyright (c) 2003 Gustavo Sverzut Barbieri * * 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 #include #include "config.h" #include "libavutil/avstring.h" #include "libavutil/bprint.h" #include "libavutil/common.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 "formats.h" #include "internal.h" #include "video.h" #include #include #include FT_FREETYPE_H #include FT_GLYPH_H #if CONFIG_FONTCONFIG #include #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", "pict_type", 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_PICT_TYPE, VAR_VARS_NB }; enum expansion_mode { EXP_NONE, EXP_NORMAL, EXP_STRFTIME, }; typedef struct { const AVClass *class; enum expansion_mode exp_mode; ///< expansion mode to use for the text int reinit; ///< tells if the filter is being reinited uint8_t *fontfile; ///< font to be used uint8_t *text; ///< text to be drawn AVBPrint expanded_text; ///< used to contain the expanded text 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 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 reload; ///< reload text file for each frame int start_number; ///< starting frame number for n/frame_num var AVDictionary *metadata; } DrawTextContext; #define OFFSET(x) offsetof(DrawTextContext, x) #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM static const AVOption drawtext_options[]= { {"fontfile", "set font file", OFFSET(fontfile), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS}, {"text", "set text", OFFSET(text), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS}, {"textfile", "set text file", OFFSET(textfile), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS}, {"fontcolor", "set foreground color", OFFSET(fontcolor.rgba), AV_OPT_TYPE_COLOR, {.str="black"}, CHAR_MIN, CHAR_MAX, FLAGS}, {"boxcolor", "set box color", OFFSET(boxcolor.rgba), AV_OPT_TYPE_COLOR, {.str="white"}, CHAR_MIN, CHAR_MAX, FLAGS}, {"shadowcolor", "set shadow color", OFFSET(shadowcolor.rgba), AV_OPT_TYPE_COLOR, {.str="black"}, CHAR_MIN, CHAR_MAX, FLAGS}, {"box", "set box", OFFSET(draw_box), AV_OPT_TYPE_INT, {.i64=0}, 0, 1 , FLAGS}, {"fontsize", "set font size", OFFSET(fontsize), AV_OPT_TYPE_INT, {.i64=0}, 0, INT_MAX , FLAGS}, {"x", "set x expression", OFFSET(x_expr), AV_OPT_TYPE_STRING, {.str="0"}, CHAR_MIN, CHAR_MAX, FLAGS}, {"y", "set y expression", OFFSET(y_expr), AV_OPT_TYPE_STRING, {.str="0"}, CHAR_MIN, CHAR_MAX, FLAGS}, {"shadowx", "set x", OFFSET(shadowx), AV_OPT_TYPE_INT, {.i64=0}, INT_MIN, INT_MAX , FLAGS}, {"shadowy", "set y", OFFSET(shadowy), AV_OPT_TYPE_INT, {.i64=0}, INT_MIN, INT_MAX , FLAGS}, {"tabsize", "set tab size", OFFSET(tabsize), AV_OPT_TYPE_INT, {.i64=4}, 0, INT_MAX , FLAGS}, {"basetime", "set base time", OFFSET(basetime), AV_OPT_TYPE_INT64, {.i64=AV_NOPTS_VALUE}, INT64_MIN, INT64_MAX , FLAGS}, {"draw", "if false do not draw", OFFSET(draw_expr), AV_OPT_TYPE_STRING, {.str="1"}, CHAR_MIN, CHAR_MAX, FLAGS}, {"expansion", "set the expansion mode", OFFSET(exp_mode), AV_OPT_TYPE_INT, {.i64=EXP_NORMAL}, 0, 2, FLAGS, "expansion"}, {"none", "set no expansion", OFFSET(exp_mode), AV_OPT_TYPE_CONST, {.i64=EXP_NONE}, 0, 0, FLAGS, "expansion"}, {"normal", "set normal expansion", OFFSET(exp_mode), AV_OPT_TYPE_CONST, {.i64=EXP_NORMAL}, 0, 0, FLAGS, "expansion"}, {"strftime", "set strftime expansion (deprecated)", OFFSET(exp_mode), AV_OPT_TYPE_CONST, {.i64=EXP_STRFTIME}, 0, 0, FLAGS, "expansion"}, {"timecode", "set initial timecode", OFFSET(tc_opt_string), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS}, {"tc24hmax", "set 24 hours max (timecode only)", OFFSET(tc24hmax), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS}, {"timecode_rate", "set rate (timecode only)", OFFSET(tc_rate), AV_OPT_TYPE_RATIONAL, {.dbl=0}, 0, INT_MAX, FLAGS}, {"r", "set rate (timecode only)", OFFSET(tc_rate), AV_OPT_TYPE_RATIONAL, {.dbl=0}, 0, INT_MAX, FLAGS}, {"rate", "set rate (timecode only)", OFFSET(tc_rate), AV_OPT_TYPE_RATIONAL, {.dbl=0}, 0, INT_MAX, FLAGS}, {"reload", "reload text file for each frame", OFFSET(reload), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS}, {"fix_bounds", "if true, check and fix text coords to avoid clipping", OFFSET(fix_bounds), AV_OPT_TYPE_INT, {.i64=1}, 0, 1, FLAGS}, {"start_number", "start frame number for n/frame_num variable", OFFSET(start_number), AV_OPT_TYPE_INT, {.i64=0}, 0, INT_MAX, FLAGS}, /* FT_LOAD_* flags */ { "ft_load_flags", "set font loading flags for libfreetype", OFFSET(ft_load_flags), AV_OPT_TYPE_FLAGS, { .i64 = FT_LOAD_DEFAULT | FT_LOAD_RENDER}, 0, INT_MAX, FLAGS, "ft_load_flags" }, { "default", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_DEFAULT }, .flags = FLAGS, .unit = "ft_load_flags" }, { "no_scale", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_SCALE }, .flags = FLAGS, .unit = "ft_load_flags" }, { "no_hinting", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_HINTING }, .flags = FLAGS, .unit = "ft_load_flags" }, { "render", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_RENDER }, .flags = FLAGS, .unit = "ft_load_flags" }, { "no_bitmap", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_BITMAP }, .flags = FLAGS, .unit = "ft_load_flags" }, { "vertical_layout", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_VERTICAL_LAYOUT }, .flags = FLAGS, .unit = "ft_load_flags" }, { "force_autohint", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_FORCE_AUTOHINT }, .flags = FLAGS, .unit = "ft_load_flags" }, { "crop_bitmap", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_CROP_BITMAP }, .flags = FLAGS, .unit = "ft_load_flags" }, { "pedantic", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_PEDANTIC }, .flags = FLAGS, .unit = "ft_load_flags" }, { "ignore_global_advance_width", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH }, .flags = FLAGS, .unit = "ft_load_flags" }, { "no_recurse", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_RECURSE }, .flags = FLAGS, .unit = "ft_load_flags" }, { "ignore_transform", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_IGNORE_TRANSFORM }, .flags = FLAGS, .unit = "ft_load_flags" }, { "monochrome", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_MONOCHROME }, .flags = FLAGS, .unit = "ft_load_flags" }, { "linear_design", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_LINEAR_DESIGN }, .flags = FLAGS, .unit = "ft_load_flags" }, { "no_autohint", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_AUTOHINT }, .flags = FLAGS, .unit = "ft_load_flags" }, { NULL}, }; AVFILTER_DEFINE_CLASS(drawtext); #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 *s = ctx->priv; Glyph *glyph; struct AVTreeNode *node = NULL; int ret; /* load glyph into s->face->glyph */ if (FT_Load_Char(s->face, code, s->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(s->face->glyph, glyph->glyph)) { ret = AVERROR(EINVAL); goto error; } glyph->bitmap = s->face->glyph->bitmap; glyph->bitmap_left = s->face->glyph->bitmap_left; glyph->bitmap_top = s->face->glyph->bitmap_top; glyph->advance = s->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_tree_node_alloc())) { ret = AVERROR(ENOMEM); goto error; } av_tree_insert(&s->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 *s = ctx->priv; int err; err = FT_New_Face(s->library, path, index, &s->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 *s = 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(s->fontfile ? s->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 (!s->fontsize) s->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 *s = 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, s->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", s->fontfile, error); return err; } static int load_textfile(AVFilterContext *ctx) { DrawTextContext *s = ctx->priv; int err; uint8_t *textbuf; size_t textbuf_size; if ((err = av_file_map(s->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", s->textfile); return err; } if (!(s->text = av_realloc(s->text, textbuf_size + 1))) return AVERROR(ENOMEM); memcpy(s->text, textbuf, textbuf_size); s->text[textbuf_size] = 0; av_file_unmap(textbuf, textbuf_size); return 0; } static av_cold int init(AVFilterContext *ctx) { int err; DrawTextContext *s = ctx->priv; Glyph *glyph; if (!s->fontfile && !CONFIG_FONTCONFIG) { av_log(ctx, AV_LOG_ERROR, "No font filename provided\n"); return AVERROR(EINVAL); } if (s->textfile) { if (s->text) { av_log(ctx, AV_LOG_ERROR, "Both text and text file provided. Please provide only one\n"); return AVERROR(EINVAL); } if ((err = load_textfile(ctx)) < 0) return err; } if (s->reload && !s->textfile) av_log(ctx, AV_LOG_WARNING, "No file to reload\n"); if (s->tc_opt_string) { int ret = av_timecode_init_from_string(&s->tc, s->tc_rate, s->tc_opt_string, ctx); if (ret < 0) return ret; if (s->tc24hmax) s->tc.flags |= AV_TIMECODE_FLAG_24HOURSMAX; if (!s->text) s->text = av_strdup(""); } if (!s->text) { av_log(ctx, AV_LOG_ERROR, "Either text, a valid file or a timecode must be provided\n"); return AVERROR(EINVAL); } if ((err = FT_Init_FreeType(&(s->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 (!s->fontsize) s->fontsize = 16; if ((err = FT_Set_Pixel_Sizes(s->face, 0, s->fontsize))) { av_log(ctx, AV_LOG_ERROR, "Could not set font size to %d pixels: %s\n", s->fontsize, FT_ERRMSG(err)); return AVERROR(EINVAL); } s->use_kerning = FT_HAS_KERNING(s->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; } s->tabsize *= glyph->advance; if (s->exp_mode == EXP_STRFTIME && (strchr(s->text, '%') || strchr(s->text, '\\'))) av_log(ctx, AV_LOG_WARNING, "expansion=strftime is deprecated.\n"); av_bprint_init(&s->expanded_text, 0, AV_BPRINT_SIZE_UNLIMITED); return 0; } static int query_formats(AVFilterContext *ctx) { ff_set_common_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 *s = ctx->priv; av_expr_free(s->x_pexpr); av_expr_free(s->y_pexpr); av_expr_free(s->draw_pexpr); s->x_pexpr = s->y_pexpr = s->draw_pexpr = NULL; av_freep(&s->positions); s->nb_positions = 0; av_tree_enumerate(s->glyphs, NULL, NULL, glyph_enu_free); av_tree_destroy(s->glyphs); s->glyphs = NULL; FT_Done_Face(s->face); FT_Done_FreeType(s->library); av_bprint_finalize(&s->expanded_text, NULL); } 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 *s = ctx->priv; int ret; ff_draw_init(&s->dc, inlink->format, 0); ff_draw_color(&s->dc, &s->fontcolor, s->fontcolor.rgba); ff_draw_color(&s->dc, &s->shadowcolor, s->shadowcolor.rgba); ff_draw_color(&s->dc, &s->boxcolor, s->boxcolor.rgba); s->var_values[VAR_w] = s->var_values[VAR_W] = s->var_values[VAR_MAIN_W] = inlink->w; s->var_values[VAR_h] = s->var_values[VAR_H] = s->var_values[VAR_MAIN_H] = inlink->h; s->var_values[VAR_SAR] = inlink->sample_aspect_ratio.num ? av_q2d(inlink->sample_aspect_ratio) : 1; s->var_values[VAR_DAR] = (double)inlink->w / inlink->h * s->var_values[VAR_SAR]; s->var_values[VAR_HSUB] = 1 << s->dc.hsub_max; s->var_values[VAR_VSUB] = 1 << s->dc.vsub_max; s->var_values[VAR_X] = NAN; s->var_values[VAR_Y] = NAN; s->var_values[VAR_T] = NAN; av_lfg_init(&s->prng, av_get_random_seed()); av_expr_free(s->x_pexpr); av_expr_free(s->y_pexpr); av_expr_free(s->draw_pexpr); s->x_pexpr = s->y_pexpr = s->draw_pexpr = NULL; if ((ret = av_expr_parse(&s->x_pexpr, s->x_expr, var_names, NULL, NULL, fun2_names, fun2, 0, ctx)) < 0 || (ret = av_expr_parse(&s->y_pexpr, s->y_expr, var_names, NULL, NULL, fun2_names, fun2, 0, ctx)) < 0 || (ret = av_expr_parse(&s->draw_pexpr, s->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 *s = ctx->priv; if (!strcmp(cmd, "reinit")) { int ret; uninit(ctx); s->reinit = 1; if ((ret = init(ctx)) < 0) return ret; return config_input(ctx->inputs[0]); } return AVERROR(ENOSYS); } static int func_pict_type(AVFilterContext *ctx, AVBPrint *bp, char *fct, unsigned argc, char **argv, int tag) { DrawTextContext *s = ctx->priv; av_bprintf(bp, "%c", av_get_picture_type_char(s->var_values[VAR_PICT_TYPE])); return 0; } static int func_pts(AVFilterContext *ctx, AVBPrint *bp, char *fct, unsigned argc, char **argv, int tag) { DrawTextContext *s = ctx->priv; av_bprintf(bp, "%.6f", s->var_values[VAR_T]); return 0; } static int func_frame_num(AVFilterContext *ctx, AVBPrint *bp, char *fct, unsigned argc, char **argv, int tag) { DrawTextContext *s = ctx->priv; av_bprintf(bp, "%d", (int)s->var_values[VAR_N]); return 0; } static int func_metadata(AVFilterContext *ctx, AVBPrint *bp, char *fct, unsigned argc, char **argv, int tag) { DrawTextContext *s = ctx->priv; AVDictionaryEntry *e = av_dict_get(s->metadata, argv[0], NULL, 0); if (e && e->value) av_bprintf(bp, "%s", e->value); return 0; } #if !HAVE_LOCALTIME_R static void localtime_r(const time_t *t, struct tm *tm) { *tm = *localtime(t); } #endif static int func_strftime(AVFilterContext *ctx, AVBPrint *bp, char *fct, unsigned argc, char **argv, int tag) { const char *fmt = argc ? argv[0] : "%Y-%m-%d %H:%M:%S"; time_t now; struct tm tm; time(&now); if (tag == 'L') localtime_r(&now, &tm); else tm = *gmtime(&now); av_bprint_strftime(bp, fmt, &tm); return 0; } static int func_eval_expr(AVFilterContext *ctx, AVBPrint *bp, char *fct, unsigned argc, char **argv, int tag) { DrawTextContext *s = ctx->priv; double res; int ret; ret = av_expr_parse_and_eval(&res, argv[0], var_names, s->var_values, NULL, NULL, fun2_names, fun2, &s->prng, 0, ctx); if (ret < 0) av_log(ctx, AV_LOG_ERROR, "Expression '%s' for the expr text expansion function is not valid\n", argv[0]); else av_bprintf(bp, "%f", res); return ret; } static const struct drawtext_function { const char *name; unsigned argc_min, argc_max; int tag; /**< opaque argument to func */ int (*func)(AVFilterContext *, AVBPrint *, char *, unsigned, char **, int); } functions[] = { { "expr", 1, 1, 0, func_eval_expr }, { "e", 1, 1, 0, func_eval_expr }, { "pict_type", 0, 0, 0, func_pict_type }, { "pts", 0, 0, 0, func_pts }, { "gmtime", 0, 1, 'G', func_strftime }, { "localtime", 0, 1, 'L', func_strftime }, { "frame_num", 0, 0, 0, func_frame_num }, { "n", 0, 0, 0, func_frame_num }, { "metadata", 1, 1, 0, func_metadata }, }; static int eval_function(AVFilterContext *ctx, AVBPrint *bp, char *fct, unsigned argc, char **argv) { unsigned i; for (i = 0; i < FF_ARRAY_ELEMS(functions); i++) { if (strcmp(fct, functions[i].name)) continue; if (argc < functions[i].argc_min) { av_log(ctx, AV_LOG_ERROR, "%%{%s} requires at least %d arguments\n", fct, functions[i].argc_min); return AVERROR(EINVAL); } if (argc > functions[i].argc_max) { av_log(ctx, AV_LOG_ERROR, "%%{%s} requires at most %d arguments\n", fct, functions[i].argc_max); return AVERROR(EINVAL); } break; } if (i >= FF_ARRAY_ELEMS(functions)) { av_log(ctx, AV_LOG_ERROR, "%%{%s} is not known\n", fct); return AVERROR(EINVAL); } return functions[i].func(ctx, bp, fct, argc, argv, functions[i].tag); } static int expand_function(AVFilterContext *ctx, AVBPrint *bp, char **rtext) { const char *text = *rtext; char *argv[16] = { NULL }; unsigned argc = 0, i; int ret; if (*text != '{') { av_log(ctx, AV_LOG_ERROR, "Stray %% near '%s'\n", text); return AVERROR(EINVAL); } text++; while (1) { if (!(argv[argc++] = av_get_token(&text, ":}"))) { ret = AVERROR(ENOMEM); goto end; } if (!*text) { av_log(ctx, AV_LOG_ERROR, "Unterminated %%{} near '%s'\n", *rtext); ret = AVERROR(EINVAL); goto end; } if (argc == FF_ARRAY_ELEMS(argv)) av_freep(&argv[--argc]); /* error will be caught later */ if (*text == '}') break; text++; } if ((ret = eval_function(ctx, bp, argv[0], argc - 1, argv + 1)) < 0) goto end; ret = 0; *rtext = (char *)text + 1; end: for (i = 0; i < argc; i++) av_freep(&argv[i]); return ret; } static int expand_text(AVFilterContext *ctx) { DrawTextContext *s = ctx->priv; char *text = s->text; AVBPrint *bp = &s->expanded_text; int ret; av_bprint_clear(bp); while (*text) { if (*text == '\\' && text[1]) { av_bprint_chars(bp, text[1], 1); text += 2; } else if (*text == '%') { text++; if ((ret = expand_function(ctx, bp, &text)) < 0) return ret; } else { av_bprint_chars(bp, *text, 1); text++; } } if (!av_bprint_is_complete(bp)) return AVERROR(ENOMEM); return 0; } static int draw_glyphs(DrawTextContext *s, AVFrame *frame, int width, int height, const uint8_t rgbcolor[4], FFDrawColor *color, int x, int y) { char *text = s->expanded_text.str; 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(s->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 = s->positions[i].x+s->x+x; y1 = s->positions[i].y+s->y+y; ff_blend_mask(&s->dc, color, frame->data, frame->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, AVFrame *frame, int width, int height) { DrawTextContext *s = ctx->priv; AVFilterLink *inlink = ctx->inputs[0]; 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 = s->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; AVBPrint *bp = &s->expanded_text; av_bprint_clear(bp); if(s->basetime != AV_NOPTS_VALUE) now= frame->pts*av_q2d(ctx->inputs[0]->time_base) + s->basetime/1000000; switch (s->exp_mode) { case EXP_NONE: av_bprintf(bp, "%s", s->text); break; case EXP_NORMAL: if ((ret = expand_text(ctx)) < 0) return ret; break; case EXP_STRFTIME: localtime_r(&now, <ime); av_bprint_strftime(bp, s->text, <ime); break; } if (s->tc_opt_string) { char tcbuf[AV_TIMECODE_STR_SIZE]; av_timecode_make_string(&s->tc, tcbuf, inlink->frame_count); av_bprint_clear(bp); av_bprintf(bp, "%s%s", s->text, tcbuf); } if (!av_bprint_is_complete(bp)) return AVERROR(ENOMEM); text = s->expanded_text.str; if ((len = s->expanded_text.len) > s->nb_positions) { if (!(s->positions = av_realloc(s->positions, len*sizeof(*s->positions)))) return AVERROR(ENOMEM); s->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(s->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); } s->max_glyph_h = y_max - y_min; s->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 += s->max_glyph_h; x = 0; continue; } /* get glyph */ prev_glyph = glyph; dummy.code = code; glyph = av_tree_find(s->glyphs, &dummy, glyph_cmp, NULL); /* kerning */ if (s->use_kerning && prev_glyph && glyph->code) { FT_Get_Kerning(s->face, prev_glyph->code, glyph->code, ft_kerning_default, &delta); x += delta.x >> 6; } /* save position */ s->positions[i].x = x + glyph->bitmap_left; s->positions[i].y = y - glyph->bitmap_top + y_max; if (code == '\t') x = (x / s->tabsize + 1)*s->tabsize; else x += glyph->advance; } max_text_line_w = FFMAX(x, max_text_line_w); s->var_values[VAR_TW] = s->var_values[VAR_TEXT_W] = max_text_line_w; s->var_values[VAR_TH] = s->var_values[VAR_TEXT_H] = y + s->max_glyph_h; s->var_values[VAR_MAX_GLYPH_W] = s->max_glyph_w; s->var_values[VAR_MAX_GLYPH_H] = s->max_glyph_h; s->var_values[VAR_MAX_GLYPH_A] = s->var_values[VAR_ASCENT ] = y_max; s->var_values[VAR_MAX_GLYPH_D] = s->var_values[VAR_DESCENT] = y_min; s->var_values[VAR_LINE_H] = s->var_values[VAR_LH] = s->max_glyph_h; s->x = s->var_values[VAR_X] = av_expr_eval(s->x_pexpr, s->var_values, &s->prng); s->y = s->var_values[VAR_Y] = av_expr_eval(s->y_pexpr, s->var_values, &s->prng); s->x = s->var_values[VAR_X] = av_expr_eval(s->x_pexpr, s->var_values, &s->prng); s->draw = av_expr_eval(s->draw_pexpr, s->var_values, &s->prng); if(!s->draw) return 0; box_w = FFMIN(width - 1 , max_text_line_w); box_h = FFMIN(height - 1, y + s->max_glyph_h); /* draw box */ if (s->draw_box) ff_blend_rectangle(&s->dc, &s->boxcolor, frame->data, frame->linesize, width, height, s->x, s->y, box_w, box_h); if (s->shadowx || s->shadowy) { if ((ret = draw_glyphs(s, frame, width, height, s->shadowcolor.rgba, &s->shadowcolor, s->shadowx, s->shadowy)) < 0) return ret; } if ((ret = draw_glyphs(s, frame, width, height, s->fontcolor.rgba, &s->fontcolor, 0, 0)) < 0) return ret; return 0; } static int filter_frame(AVFilterLink *inlink, AVFrame *frame) { AVFilterContext *ctx = inlink->dst; AVFilterLink *outlink = ctx->outputs[0]; DrawTextContext *s = ctx->priv; int ret; if (s->reload) if ((ret = load_textfile(ctx)) < 0) return ret; s->var_values[VAR_N] = inlink->frame_count+s->start_number; s->var_values[VAR_T] = frame->pts == AV_NOPTS_VALUE ? NAN : frame->pts * av_q2d(inlink->time_base); s->var_values[VAR_PICT_TYPE] = frame->pict_type; s->metadata = av_frame_get_metadata(frame); draw_text(ctx, frame, frame->width, frame->height); av_log(ctx, AV_LOG_DEBUG, "n:%d t:%f text_w:%d text_h:%d x:%d y:%d\n", (int)s->var_values[VAR_N], s->var_values[VAR_T], (int)s->var_values[VAR_TEXT_W], (int)s->var_values[VAR_TEXT_H], s->x, s->y); return ff_filter_frame(outlink, frame); } static const AVFilterPad avfilter_vf_drawtext_inputs[] = { { .name = "default", .type = AVMEDIA_TYPE_VIDEO, .get_video_buffer = ff_null_get_video_buffer, .filter_frame = filter_frame, .config_props = config_input, .needs_writable = 1, }, { NULL } }; static const AVFilterPad avfilter_vf_drawtext_outputs[] = { { .name = "default", .type = AVMEDIA_TYPE_VIDEO, }, { NULL } }; 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), .priv_class = &drawtext_class, .init = init, .uninit = uninit, .query_formats = query_formats, .inputs = avfilter_vf_drawtext_inputs, .outputs = avfilter_vf_drawtext_outputs, .process_command = command, };