| /* |
| * 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 "config.h" |
| |
| #if HAVE_SYS_TIME_H |
| #include <sys/time.h> |
| #endif |
| #include <sys/types.h> |
| #include <sys/stat.h> |
| #include <time.h> |
| #if HAVE_UNISTD_H |
| #include <unistd.h> |
| #endif |
| #include <fenv.h> |
| |
| #if CONFIG_LIBFONTCONFIG |
| #include <fontconfig/fontconfig.h> |
| #endif |
| |
| #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/time_internal.h" |
| #include "libavutil/tree.h" |
| #include "libavutil/lfg.h" |
| #include "avfilter.h" |
| #include "drawutils.h" |
| #include "formats.h" |
| #include "internal.h" |
| #include "video.h" |
| |
| #if CONFIG_LIBFRIBIDI |
| #include <fribidi.h> |
| #endif |
| |
| #include <ft2build.h> |
| #include FT_FREETYPE_H |
| #include FT_GLYPH_H |
| #include FT_STROKER_H |
| |
| 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", |
| "pkt_pos", |
| "pkt_duration", |
| "pkt_size", |
| 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_PKT_POS, |
| VAR_PKT_DURATION, |
| VAR_PKT_SIZE, |
| VAR_VARS_NB |
| }; |
| |
| enum expansion_mode { |
| EXP_NONE, |
| EXP_NORMAL, |
| EXP_STRFTIME, |
| }; |
| |
| typedef struct DrawTextContext { |
| const AVClass *class; |
| int exp_mode; ///< expansion mode to use for the text |
| int reinit; ///< tells if the filter is being reinited |
| #if CONFIG_LIBFONTCONFIG |
| uint8_t *font; ///< font to be used |
| #endif |
| uint8_t *fontfile; ///< font to be used |
| uint8_t *text; ///< text to be drawn |
| AVBPrint expanded_text; ///< used to contain the expanded text |
| uint8_t *fontcolor_expr; ///< fontcolor expression to evaluate |
| AVBPrint expanded_fontcolor; ///< used to contain the expanded fontcolor spec |
| 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; |
| int borderw; ///< border width |
| char *fontsize_expr; ///< expression for fontsize |
| AVExpr *fontsize_pexpr; ///< parsed expressions for fontsize |
| unsigned int fontsize; ///< font size to use |
| unsigned int default_fontsize; ///< default font size to use |
| |
| int line_spacing; ///< lines spacing in pixels |
| short int draw_box; ///< draw box around text - true or false |
| int boxborderw; ///< box border width |
| 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 bordercolor; ///< border color |
| FFDrawColor boxcolor; ///< background color |
| |
| FT_Library library; ///< freetype font library handle |
| FT_Face face; ///< freetype font face handle |
| FT_Stroker stroker; ///< freetype stroker 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 *a_expr; |
| AVExpr *a_pexpr; |
| int alpha; |
| 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 |
| #if CONFIG_LIBFRIBIDI |
| int text_shaping; ///< 1 to shape the text before drawing it |
| #endif |
| 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}, 0, 0, FLAGS}, |
| {"text", "set text", OFFSET(text), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, FLAGS}, |
| {"textfile", "set text file", OFFSET(textfile), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, FLAGS}, |
| {"fontcolor", "set foreground color", OFFSET(fontcolor.rgba), AV_OPT_TYPE_COLOR, {.str="black"}, 0, 0, FLAGS}, |
| {"fontcolor_expr", "set foreground color expression", OFFSET(fontcolor_expr), AV_OPT_TYPE_STRING, {.str=""}, 0, 0, FLAGS}, |
| {"boxcolor", "set box color", OFFSET(boxcolor.rgba), AV_OPT_TYPE_COLOR, {.str="white"}, 0, 0, FLAGS}, |
| {"bordercolor", "set border color", OFFSET(bordercolor.rgba), AV_OPT_TYPE_COLOR, {.str="black"}, 0, 0, FLAGS}, |
| {"shadowcolor", "set shadow color", OFFSET(shadowcolor.rgba), AV_OPT_TYPE_COLOR, {.str="black"}, 0, 0, FLAGS}, |
| {"box", "set box", OFFSET(draw_box), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1 , FLAGS}, |
| {"boxborderw", "set box border width", OFFSET(boxborderw), AV_OPT_TYPE_INT, {.i64=0}, INT_MIN, INT_MAX , FLAGS}, |
| {"line_spacing", "set line spacing in pixels", OFFSET(line_spacing), AV_OPT_TYPE_INT, {.i64=0}, INT_MIN, INT_MAX,FLAGS}, |
| {"fontsize", "set font size", OFFSET(fontsize_expr), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0 , FLAGS}, |
| {"x", "set x expression", OFFSET(x_expr), AV_OPT_TYPE_STRING, {.str="0"}, 0, 0, FLAGS}, |
| {"y", "set y expression", OFFSET(y_expr), AV_OPT_TYPE_STRING, {.str="0"}, 0, 0, FLAGS}, |
| {"shadowx", "set shadow x offset", OFFSET(shadowx), AV_OPT_TYPE_INT, {.i64=0}, INT_MIN, INT_MAX , FLAGS}, |
| {"shadowy", "set shadow y offset", OFFSET(shadowy), AV_OPT_TYPE_INT, {.i64=0}, INT_MIN, INT_MAX , FLAGS}, |
| {"borderw", "set border width", OFFSET(borderw), 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}, |
| #if CONFIG_LIBFONTCONFIG |
| { "font", "Font name", OFFSET(font), AV_OPT_TYPE_STRING, { .str = "Sans" }, .flags = FLAGS }, |
| #endif |
| |
| {"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}, 0, 0, FLAGS}, |
| {"tc24hmax", "set 24 hours max (timecode only)", OFFSET(tc24hmax), AV_OPT_TYPE_BOOL, {.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_BOOL, {.i64=0}, 0, 1, FLAGS}, |
| { "alpha", "apply alpha while rendering", OFFSET(a_expr), AV_OPT_TYPE_STRING, { .str = "1" }, .flags = FLAGS }, |
| {"fix_bounds", "check and fix text coords to avoid clipping", OFFSET(fix_bounds), AV_OPT_TYPE_BOOL, {.i64=0}, 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}, |
| |
| #if CONFIG_LIBFRIBIDI |
| {"text_shaping", "attempt to shape text before drawing", OFFSET(text_shaping), AV_OPT_TYPE_BOOL, {.i64=1}, 0, 1, FLAGS}, |
| #endif |
| |
| /* FT_LOAD_* flags */ |
| { "ft_load_flags", "set font loading flags for libfreetype", OFFSET(ft_load_flags), AV_OPT_TYPE_FLAGS, { .i64 = FT_LOAD_DEFAULT }, 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 } }; |
| |
| static const struct ft_error { |
| int err; |
| const char *err_msg; |
| } ft_errors[] = |
| #include FT_ERRORS_H |
| |
| #define FT_ERRMSG(e) ft_errors[e].err_msg |
| |
| typedef struct Glyph { |
| FT_Glyph glyph; |
| FT_Glyph border_glyph; |
| uint32_t code; |
| unsigned int fontsize; |
| FT_Bitmap bitmap; ///< array holding bitmaps of font |
| FT_Bitmap border_bitmap; ///< array holding bitmaps of font border |
| FT_BBox bbox; |
| int advance; |
| int bitmap_left; |
| int bitmap_top; |
| } Glyph; |
| |
| static int glyph_cmp(const void *key, const void *b) |
| { |
| const Glyph *a = key, *bb = b; |
| int64_t diff = (int64_t)a->code - (int64_t)bb->code; |
| |
| if (diff != 0) |
| return diff > 0 ? 1 : -1; |
| else |
| return FFDIFFSIGN((int64_t)a->fontsize, (int64_t)bb->fontsize); |
| } |
| |
| /** |
| * 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; |
| FT_BitmapGlyph bitmapglyph; |
| 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); |
| |
| glyph = av_mallocz(sizeof(*glyph)); |
| if (!glyph) { |
| ret = AVERROR(ENOMEM); |
| goto error; |
| } |
| glyph->code = code; |
| glyph->fontsize = s->fontsize; |
| |
| if (FT_Get_Glyph(s->face->glyph, &glyph->glyph)) { |
| ret = AVERROR(EINVAL); |
| goto error; |
| } |
| if (s->borderw) { |
| glyph->border_glyph = glyph->glyph; |
| if (FT_Glyph_StrokeBorder(&glyph->border_glyph, s->stroker, 0, 0) || |
| FT_Glyph_To_Bitmap(&glyph->border_glyph, FT_RENDER_MODE_NORMAL, 0, 1)) { |
| ret = AVERROR_EXTERNAL; |
| goto error; |
| } |
| bitmapglyph = (FT_BitmapGlyph) glyph->border_glyph; |
| glyph->border_bitmap = bitmapglyph->bitmap; |
| } |
| if (FT_Glyph_To_Bitmap(&glyph->glyph, FT_RENDER_MODE_NORMAL, 0, 1)) { |
| ret = AVERROR_EXTERNAL; |
| goto error; |
| } |
| bitmapglyph = (FT_BitmapGlyph) glyph->glyph; |
| |
| glyph->bitmap = bitmapglyph->bitmap; |
| glyph->bitmap_left = bitmapglyph->left; |
| glyph->bitmap_top = bitmapglyph->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 av_cold int set_fontsize(AVFilterContext *ctx, unsigned int fontsize) |
| { |
| int err; |
| DrawTextContext *s = ctx->priv; |
| |
| if ((err = FT_Set_Pixel_Sizes(s->face, 0, fontsize))) { |
| av_log(ctx, AV_LOG_ERROR, "Could not set font size to %d pixels: %s\n", |
| fontsize, FT_ERRMSG(err)); |
| return AVERROR(EINVAL); |
| } |
| |
| s->fontsize = fontsize; |
| |
| return 0; |
| } |
| |
| static av_cold int parse_fontsize(AVFilterContext *ctx) |
| { |
| DrawTextContext *s = ctx->priv; |
| int err; |
| |
| if (s->fontsize_pexpr) |
| return 0; |
| |
| if (s->fontsize_expr == NULL) |
| return AVERROR(EINVAL); |
| |
| if ((err = av_expr_parse(&s->fontsize_pexpr, s->fontsize_expr, var_names, |
| NULL, NULL, fun2_names, fun2, 0, ctx)) < 0) |
| return err; |
| |
| return 0; |
| } |
| |
| static av_cold int update_fontsize(AVFilterContext *ctx) |
| { |
| DrawTextContext *s = ctx->priv; |
| unsigned int fontsize = s->default_fontsize; |
| int err; |
| double size, roundedsize; |
| |
| // if no fontsize specified use the default |
| if (s->fontsize_expr != NULL) { |
| if ((err = parse_fontsize(ctx)) < 0) |
| return err; |
| |
| size = av_expr_eval(s->fontsize_pexpr, s->var_values, &s->prng); |
| |
| if (!isnan(size)) { |
| roundedsize = round(size); |
| // test for overflow before cast |
| if (!(roundedsize > INT_MIN && roundedsize < INT_MAX)) { |
| av_log(ctx, AV_LOG_ERROR, "fontsize overflow\n"); |
| return AVERROR(EINVAL); |
| } |
| |
| fontsize = roundedsize; |
| } |
| } |
| |
| if (fontsize == 0) |
| fontsize = 1; |
| |
| // no change |
| if (fontsize == s->fontsize) |
| return 0; |
| |
| return set_fontsize(ctx, fontsize); |
| } |
| |
| static int load_font_file(AVFilterContext *ctx, const char *path, int index) |
| { |
| DrawTextContext *s = ctx->priv; |
| int err; |
| |
| err = FT_New_Face(s->library, path, index, &s->face); |
| if (err) { |
| #if !CONFIG_LIBFONTCONFIG |
| av_log(ctx, AV_LOG_ERROR, "Could not load font \"%s\": %s\n", |
| s->fontfile, FT_ERRMSG(err)); |
| #endif |
| return AVERROR(EINVAL); |
| } |
| return 0; |
| } |
| |
| #if CONFIG_LIBFONTCONFIG |
| static int load_font_fontconfig(AVFilterContext *ctx) |
| { |
| DrawTextContext *s = ctx->priv; |
| FcConfig *fontconfig; |
| FcPattern *pat, *best; |
| FcResult result = FcResultMatch; |
| FcChar8 *filename; |
| int index; |
| double size; |
| int err = AVERROR(ENOENT); |
| int parse_err; |
| |
| fontconfig = FcInitLoadConfigAndFonts(); |
| if (!fontconfig) { |
| av_log(ctx, AV_LOG_ERROR, "impossible to init fontconfig\n"); |
| return AVERROR_UNKNOWN; |
| } |
| pat = FcNameParse(s->fontfile ? s->fontfile : |
| (uint8_t *)(intptr_t)"default"); |
| if (!pat) { |
| av_log(ctx, AV_LOG_ERROR, "could not parse fontconfig pat"); |
| return AVERROR(EINVAL); |
| } |
| |
| FcPatternAddString(pat, FC_FAMILY, s->font); |
| |
| parse_err = parse_fontsize(ctx); |
| if (!parse_err) { |
| double size = av_expr_eval(s->fontsize_pexpr, s->var_values, &s->prng); |
| |
| if (isnan(size)) { |
| av_log(ctx, AV_LOG_ERROR, "impossible to find font information"); |
| return AVERROR(EINVAL); |
| } |
| |
| FcPatternAddDouble(pat, FC_SIZE, size); |
| } |
| |
| FcDefaultSubstitute(pat); |
| |
| if (!FcConfigSubstitute(fontconfig, pat, FcMatchPattern)) { |
| av_log(ctx, AV_LOG_ERROR, "could not substitue fontconfig options"); /* very unlikely */ |
| FcPatternDestroy(pat); |
| return AVERROR(ENOMEM); |
| } |
| |
| best = FcFontMatch(fontconfig, pat, &result); |
| FcPatternDestroy(pat); |
| |
| if (!best || result != FcResultMatch) { |
| av_log(ctx, AV_LOG_ERROR, |
| "Cannot find a valid font for the family %s\n", |
| s->font); |
| goto fail; |
| } |
| |
| if ( |
| FcPatternGetInteger(best, FC_INDEX, 0, &index ) != FcResultMatch || |
| FcPatternGetDouble (best, FC_SIZE, 0, &size ) != FcResultMatch) { |
| av_log(ctx, AV_LOG_ERROR, "impossible to find font information"); |
| return AVERROR(EINVAL); |
| } |
| |
| if (FcPatternGetString(best, FC_FILE, 0, &filename) != FcResultMatch) { |
| av_log(ctx, AV_LOG_ERROR, "No file path for %s\n", |
| s->font); |
| goto fail; |
| } |
| |
| av_log(ctx, AV_LOG_INFO, "Using \"%s\"\n", filename); |
| if (parse_err) |
| s->default_fontsize = size + 0.5; |
| |
| err = load_font_file(ctx, filename, index); |
| if (err) |
| return err; |
| FcConfigDestroy(fontconfig); |
| fail: |
| FcPatternDestroy(best); |
| return err; |
| } |
| #endif |
| |
| static int load_font(AVFilterContext *ctx) |
| { |
| DrawTextContext *s = ctx->priv; |
| int err; |
| |
| /* load the face, and set up the encoding, which is by default UTF-8 */ |
| err = load_font_file(ctx, s->fontfile, 0); |
| if (!err) |
| return 0; |
| #if CONFIG_LIBFONTCONFIG |
| err = load_font_fontconfig(ctx); |
| if (!err) |
| return 0; |
| #endif |
| return err; |
| } |
| |
| static int load_textfile(AVFilterContext *ctx) |
| { |
| DrawTextContext *s = ctx->priv; |
| int err; |
| uint8_t *textbuf; |
| uint8_t *tmp; |
| 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 (textbuf_size > SIZE_MAX - 1 || !(tmp = av_realloc(s->text, textbuf_size + 1))) { |
| av_file_unmap(textbuf, textbuf_size); |
| return AVERROR(ENOMEM); |
| } |
| s->text = tmp; |
| memcpy(s->text, textbuf, textbuf_size); |
| s->text[textbuf_size] = 0; |
| av_file_unmap(textbuf, textbuf_size); |
| |
| return 0; |
| } |
| |
| static inline int is_newline(uint32_t c) |
| { |
| return c == '\n' || c == '\r' || c == '\f' || c == '\v'; |
| } |
| |
| #if CONFIG_LIBFRIBIDI |
| static int shape_text(AVFilterContext *ctx) |
| { |
| DrawTextContext *s = ctx->priv; |
| uint8_t *tmp; |
| int ret = AVERROR(ENOMEM); |
| static const FriBidiFlags flags = FRIBIDI_FLAGS_DEFAULT | |
| FRIBIDI_FLAGS_ARABIC; |
| FriBidiChar *unicodestr = NULL; |
| FriBidiStrIndex len; |
| FriBidiParType direction = FRIBIDI_PAR_LTR; |
| FriBidiStrIndex line_start = 0; |
| FriBidiStrIndex line_end = 0; |
| FriBidiLevel *embedding_levels = NULL; |
| FriBidiArabicProp *ar_props = NULL; |
| FriBidiCharType *bidi_types = NULL; |
| FriBidiStrIndex i,j; |
| |
| len = strlen(s->text); |
| if (!(unicodestr = av_malloc_array(len, sizeof(*unicodestr)))) { |
| goto out; |
| } |
| len = fribidi_charset_to_unicode(FRIBIDI_CHAR_SET_UTF8, |
| s->text, len, unicodestr); |
| |
| bidi_types = av_malloc_array(len, sizeof(*bidi_types)); |
| if (!bidi_types) { |
| goto out; |
| } |
| |
| fribidi_get_bidi_types(unicodestr, len, bidi_types); |
| |
| embedding_levels = av_malloc_array(len, sizeof(*embedding_levels)); |
| if (!embedding_levels) { |
| goto out; |
| } |
| |
| if (!fribidi_get_par_embedding_levels(bidi_types, len, &direction, |
| embedding_levels)) { |
| goto out; |
| } |
| |
| ar_props = av_malloc_array(len, sizeof(*ar_props)); |
| if (!ar_props) { |
| goto out; |
| } |
| |
| fribidi_get_joining_types(unicodestr, len, ar_props); |
| fribidi_join_arabic(bidi_types, len, embedding_levels, ar_props); |
| fribidi_shape(flags, embedding_levels, len, ar_props, unicodestr); |
| |
| for (line_end = 0, line_start = 0; line_end < len; line_end++) { |
| if (is_newline(unicodestr[line_end]) || line_end == len - 1) { |
| if (!fribidi_reorder_line(flags, bidi_types, |
| line_end - line_start + 1, line_start, |
| direction, embedding_levels, unicodestr, |
| NULL)) { |
| goto out; |
| } |
| line_start = line_end + 1; |
| } |
| } |
| |
| /* Remove zero-width fill chars put in by libfribidi */ |
| for (i = 0, j = 0; i < len; i++) |
| if (unicodestr[i] != FRIBIDI_CHAR_FILL) |
| unicodestr[j++] = unicodestr[i]; |
| len = j; |
| |
| if (!(tmp = av_realloc(s->text, (len * 4 + 1) * sizeof(*s->text)))) { |
| /* Use len * 4, as a unicode character can be up to 4 bytes in UTF-8 */ |
| goto out; |
| } |
| |
| s->text = tmp; |
| len = fribidi_unicode_to_charset(FRIBIDI_CHAR_SET_UTF8, |
| unicodestr, len, s->text); |
| ret = 0; |
| |
| out: |
| av_free(unicodestr); |
| av_free(embedding_levels); |
| av_free(ar_props); |
| av_free(bidi_types); |
| return ret; |
| } |
| #endif |
| |
| static av_cold int init(AVFilterContext *ctx) |
| { |
| int err; |
| DrawTextContext *s = ctx->priv; |
| Glyph *glyph; |
| |
| av_expr_free(s->fontsize_pexpr); |
| s->fontsize_pexpr = NULL; |
| |
| s->fontsize = 0; |
| s->default_fontsize = 16; |
| |
| if (!s->fontfile && !CONFIG_LIBFONTCONFIG) { |
| 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 CONFIG_LIBFRIBIDI |
| if (s->text_shaping) |
| if ((err = shape_text(ctx)) < 0) |
| return err; |
| #endif |
| |
| 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); |
| } |
| |
| if ((err = load_font(ctx)) < 0) |
| return err; |
| |
| if ((err = update_fontsize(ctx)) < 0) |
| return err; |
| |
| if (s->borderw) { |
| if (FT_Stroker_New(s->library, &s->stroker)) { |
| av_log(ctx, AV_LOG_ERROR, "Coult not init FT stroker\n"); |
| return AVERROR_EXTERNAL; |
| } |
| FT_Stroker_Set(s->stroker, s->borderw << 6, FT_STROKER_LINECAP_ROUND, |
| FT_STROKER_LINEJOIN_ROUND, 0); |
| } |
| |
| 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); |
| av_bprint_init(&s->expanded_fontcolor, 0, AV_BPRINT_SIZE_UNLIMITED); |
| |
| return 0; |
| } |
| |
| static int query_formats(AVFilterContext *ctx) |
| { |
| return ff_set_common_formats(ctx, ff_draw_supported_pixel_formats(0)); |
| } |
| |
| static int glyph_enu_free(void *opaque, void *elem) |
| { |
| Glyph *glyph = elem; |
| |
| FT_Done_Glyph(glyph->glyph); |
| FT_Done_Glyph(glyph->border_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->a_pexpr); |
| av_expr_free(s->fontsize_pexpr); |
| |
| s->x_pexpr = s->y_pexpr = s->a_pexpr = s->fontsize_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_Stroker_Done(s->stroker); |
| FT_Done_FreeType(s->library); |
| |
| av_bprint_finalize(&s->expanded_text, NULL); |
| av_bprint_finalize(&s->expanded_fontcolor, NULL); |
| } |
| |
| static int config_input(AVFilterLink *inlink) |
| { |
| AVFilterContext *ctx = inlink->dst; |
| DrawTextContext *s = ctx->priv; |
| char *expr; |
| int ret; |
| |
| ff_draw_init(&s->dc, inlink->format, FF_DRAW_PROCESS_ALPHA); |
| 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->bordercolor, s->bordercolor.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->a_pexpr); |
| s->x_pexpr = s->y_pexpr = s->a_pexpr = NULL; |
| |
| if ((ret = av_expr_parse(&s->x_pexpr, expr = s->x_expr, var_names, |
| NULL, NULL, fun2_names, fun2, 0, ctx)) < 0 || |
| (ret = av_expr_parse(&s->y_pexpr, expr = s->y_expr, var_names, |
| NULL, NULL, fun2_names, fun2, 0, ctx)) < 0 || |
| (ret = av_expr_parse(&s->a_pexpr, expr = s->a_expr, var_names, |
| NULL, NULL, fun2_names, fun2, 0, ctx)) < 0) { |
| av_log(ctx, AV_LOG_ERROR, "Failed to parse expression: %s \n", expr); |
| return AVERROR(EINVAL); |
| } |
| |
| return 0; |
| } |
| |
| static int command(AVFilterContext *ctx, const char *cmd, const char *arg, char *res, int res_len, int flags) |
| { |
| DrawTextContext *old = ctx->priv; |
| DrawTextContext *new = NULL; |
| int ret; |
| |
| if (!strcmp(cmd, "reinit")) { |
| new = av_mallocz(sizeof(DrawTextContext)); |
| if (!new) |
| return AVERROR(ENOMEM); |
| |
| new->class = &drawtext_class; |
| ret = av_opt_copy(new, old); |
| if (ret < 0) |
| goto fail; |
| |
| ctx->priv = new; |
| ret = av_set_options_string(ctx, arg, "=", ":"); |
| if (ret < 0) { |
| ctx->priv = old; |
| goto fail; |
| } |
| |
| ret = init(ctx); |
| if (ret < 0) { |
| uninit(ctx); |
| ctx->priv = old; |
| goto fail; |
| } |
| |
| new->reinit = 1; |
| |
| ctx->priv = old; |
| uninit(ctx); |
| av_freep(&old); |
| |
| ctx->priv = new; |
| return config_input(ctx->inputs[0]); |
| } else |
| return AVERROR(ENOSYS); |
| |
| fail: |
| av_log(ctx, AV_LOG_ERROR, "Failed to process command. Continuing with existing parameters.\n"); |
| av_freep(&new); |
| return ret; |
| } |
| |
| 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; |
| const char *fmt; |
| double pts = s->var_values[VAR_T]; |
| int ret; |
| |
| fmt = argc >= 1 ? argv[0] : "flt"; |
| if (argc >= 2) { |
| int64_t delta; |
| if ((ret = av_parse_time(&delta, argv[1], 1)) < 0) { |
| av_log(ctx, AV_LOG_ERROR, "Invalid delta '%s'\n", argv[1]); |
| return ret; |
| } |
| pts += (double)delta / AV_TIME_BASE; |
| } |
| if (!strcmp(fmt, "flt")) { |
| av_bprintf(bp, "%.6f", pts); |
| } else if (!strcmp(fmt, "hms")) { |
| if (isnan(pts)) { |
| av_bprintf(bp, " ??:??:??.???"); |
| } else { |
| int64_t ms = llrint(pts * 1000); |
| char sign = ' '; |
| if (ms < 0) { |
| sign = '-'; |
| ms = -ms; |
| } |
| if (argc >= 3) { |
| if (!strcmp(argv[2], "24HH")) { |
| ms %= 24 * 60 * 60 * 1000; |
| } else { |
| av_log(ctx, AV_LOG_ERROR, "Invalid argument '%s'\n", argv[2]); |
| return AVERROR(EINVAL); |
| } |
| } |
| av_bprintf(bp, "%c%02d:%02d:%02d.%03d", sign, |
| (int)(ms / (60 * 60 * 1000)), |
| (int)(ms / (60 * 1000)) % 60, |
| (int)(ms / 1000) % 60, |
| (int)(ms % 1000)); |
| } |
| } else if (!strcmp(fmt, "localtime") || |
| !strcmp(fmt, "gmtime")) { |
| struct tm tm; |
| time_t ms = (time_t)pts; |
| const char *timefmt = argc >= 3 ? argv[2] : "%Y-%m-%d %H:%M:%S"; |
| if (!strcmp(fmt, "localtime")) |
| localtime_r(&ms, &tm); |
| else |
| gmtime_r(&ms, &tm); |
| av_bprint_strftime(bp, timefmt, &tm); |
| } else { |
| av_log(ctx, AV_LOG_ERROR, "Invalid format '%s'\n", fmt); |
| return AVERROR(EINVAL); |
| } |
| 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); |
| else if (argc >= 2) |
| av_bprintf(bp, "%s", argv[1]); |
| return 0; |
| } |
| |
| 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_r(&now, &tm); |
| 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 int func_eval_expr_int_format(AVFilterContext *ctx, AVBPrint *bp, |
| char *fct, unsigned argc, char **argv, int tag) |
| { |
| DrawTextContext *s = ctx->priv; |
| double res; |
| int intval; |
| int ret; |
| unsigned int positions = 0; |
| char fmt_str[30] = "%"; |
| |
| /* |
| * argv[0] expression to be converted to `int` |
| * argv[1] format: 'x', 'X', 'd' or 'u' |
| * argv[2] positions printed (optional) |
| */ |
| |
| 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]); |
| return ret; |
| } |
| |
| if (!strchr("xXdu", argv[1][0])) { |
| av_log(ctx, AV_LOG_ERROR, "Invalid format '%c' specified," |
| " allowed values: 'x', 'X', 'd', 'u'\n", argv[1][0]); |
| return AVERROR(EINVAL); |
| } |
| |
| if (argc == 3) { |
| ret = sscanf(argv[2], "%u", &positions); |
| if (ret != 1) { |
| av_log(ctx, AV_LOG_ERROR, "expr_int_format(): Invalid number of positions" |
| " to print: '%s'\n", argv[2]); |
| return AVERROR(EINVAL); |
| } |
| } |
| |
| feclearexcept(FE_ALL_EXCEPT); |
| intval = res; |
| #if defined(FE_INVALID) && defined(FE_OVERFLOW) && defined(FE_UNDERFLOW) |
| if ((ret = fetestexcept(FE_INVALID|FE_OVERFLOW|FE_UNDERFLOW))) { |
| av_log(ctx, AV_LOG_ERROR, "Conversion of floating-point result to int failed. Control register: 0x%08x. Conversion result: %d\n", ret, intval); |
| return AVERROR(EINVAL); |
| } |
| #endif |
| |
| if (argc == 3) |
| av_strlcatf(fmt_str, sizeof(fmt_str), "0%u", positions); |
| av_strlcatf(fmt_str, sizeof(fmt_str), "%c", argv[1][0]); |
| |
| av_log(ctx, AV_LOG_DEBUG, "Formatting value %f (expr '%s') with spec '%s'\n", |
| res, argv[0], fmt_str); |
| |
| av_bprintf(bp, fmt_str, intval); |
| |
| return 0; |
| } |
| |
| 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 }, |
| { "expr_int_format", 2, 3, 0, func_eval_expr_int_format }, |
| { "eif", 2, 3, 0, func_eval_expr_int_format }, |
| { "pict_type", 0, 0, 0, func_pict_type }, |
| { "pts", 0, 3, 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, 2, 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, char *text, AVBPrint *bp) |
| { |
| 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, |
| FFDrawColor *color, |
| int x, int y, int borderw) |
| { |
| 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++) { |
| FT_Bitmap bitmap; |
| Glyph dummy = { 0 }; |
| GET_UTF8(code, *p ? *p++ : 0, code = 0xfffd; goto continue_on_invalid;); |
| continue_on_invalid: |
| |
| /* skip new line chars, just go to new line */ |
| if (code == '\n' || code == '\r' || code == '\t') |
| continue; |
| |
| dummy.code = code; |
| dummy.fontsize = s->fontsize; |
| glyph = av_tree_find(s->glyphs, &dummy, glyph_cmp, NULL); |
| |
| bitmap = borderw ? glyph->border_bitmap : glyph->bitmap; |
| |
| 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 - borderw; |
| y1 = s->positions[i].y+s->y+y - borderw; |
| |
| ff_blend_mask(&s->dc, color, |
| frame->data, frame->linesize, width, height, |
| bitmap.buffer, bitmap.pitch, |
| bitmap.width, bitmap.rows, |
| bitmap.pixel_mode == FT_PIXEL_MODE_MONO ? 0 : 3, |
| 0, x1, y1); |
| } |
| |
| return 0; |
| } |
| |
| |
| static void update_color_with_alpha(DrawTextContext *s, FFDrawColor *color, const FFDrawColor incolor) |
| { |
| *color = incolor; |
| color->rgba[3] = (color->rgba[3] * s->alpha) / 255; |
| ff_draw_color(&s->dc, color, color->rgba); |
| } |
| |
| static void update_alpha(DrawTextContext *s) |
| { |
| double alpha = av_expr_eval(s->a_pexpr, s->var_values, &s->prng); |
| |
| if (isnan(alpha)) |
| return; |
| |
| if (alpha >= 1.0) |
| s->alpha = 255; |
| else if (alpha <= 0) |
| s->alpha = 0; |
| else |
| s->alpha = 256 * alpha; |
| } |
| |
| 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; |
| 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; |
| |
| FFDrawColor fontcolor; |
| FFDrawColor shadowcolor; |
| FFDrawColor bordercolor; |
| FFDrawColor boxcolor; |
| |
| 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, s->text, &s->expanded_text)) < 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_out); |
| 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; |
| } |
| |
| if (s->fontcolor_expr[0]) { |
| /* If expression is set, evaluate and replace the static value */ |
| av_bprint_clear(&s->expanded_fontcolor); |
| if ((ret = expand_text(ctx, s->fontcolor_expr, &s->expanded_fontcolor)) < 0) |
| return ret; |
| if (!av_bprint_is_complete(&s->expanded_fontcolor)) |
| return AVERROR(ENOMEM); |
| av_log(s, AV_LOG_DEBUG, "Evaluated fontcolor is '%s'\n", s->expanded_fontcolor.str); |
| ret = av_parse_color(s->fontcolor.rgba, s->expanded_fontcolor.str, -1, s); |
| if (ret) |
| return ret; |
| ff_draw_color(&s->dc, &s->fontcolor, s->fontcolor.rgba); |
| } |
| |
| x = 0; |
| y = 0; |
| |
| if ((ret = update_fontsize(ctx)) < 0) |
| return ret; |
| |
| /* load and cache glyphs */ |
| for (i = 0, p = text; *p; i++) { |
| GET_UTF8(code, *p ? *p++ : 0, code = 0xfffd; goto continue_on_invalid;); |
| continue_on_invalid: |
| |
| /* get glyph */ |
| dummy.code = code; |
| dummy.fontsize = s->fontsize; |
| glyph = av_tree_find(s->glyphs, &dummy, glyph_cmp, NULL); |
| if (!glyph) { |
| ret = load_glyph(ctx, &glyph, code); |
| if (ret < 0) |
| return ret; |
| } |
| |
| 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 ? *p++ : 0, code = 0xfffd; goto continue_on_invalid2;); |
| continue_on_invalid2: |
| |
| /* 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 + s->line_spacing; |
| x = 0; |
| continue; |
| } |
| |
| /* get glyph */ |
| prev_glyph = glyph; |
| dummy.code = code; |
| dummy.fontsize = s->fontsize; |
| 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); |
| /* It is necessary if x is expressed from y */ |
| s->x = s->var_values[VAR_X] = av_expr_eval(s->x_pexpr, s->var_values, &s->prng); |
| |
| update_alpha(s); |
| update_color_with_alpha(s, &fontcolor , s->fontcolor ); |
| update_color_with_alpha(s, &shadowcolor, s->shadowcolor); |
| update_color_with_alpha(s, &bordercolor, s->bordercolor); |
| update_color_with_alpha(s, &boxcolor , s->boxcolor ); |
| |
| box_w = max_text_line_w; |
| box_h = y + s->max_glyph_h; |
| |
| if (s->fix_bounds) { |
| |
| /* calculate footprint of text effects */ |
| int boxoffset = s->draw_box ? FFMAX(s->boxborderw, 0) : 0; |
| int borderoffset = s->borderw ? FFMAX(s->borderw, 0) : 0; |
| |
| int offsetleft = FFMAX3(boxoffset, borderoffset, |
| (s->shadowx < 0 ? FFABS(s->shadowx) : 0)); |
| int offsettop = FFMAX3(boxoffset, borderoffset, |
| (s->shadowy < 0 ? FFABS(s->shadowy) : 0)); |
| |
| int offsetright = FFMAX3(boxoffset, borderoffset, |
| (s->shadowx > 0 ? s->shadowx : 0)); |
| int offsetbottom = FFMAX3(boxoffset, borderoffset, |
| (s->shadowy > 0 ? s->shadowy : 0)); |
| |
| |
| if (s->x - offsetleft < 0) s->x = offsetleft; |
| if (s->y - offsettop < 0) s->y = offsettop; |
| |
| if (s->x + box_w + offsetright > width) |
| s->x = FFMAX(width - box_w - offsetright, 0); |
| if (s->y + box_h + offsetbottom > height) |
| s->y = FFMAX(height - box_h - offsetbottom, 0); |
| } |
| |
| /* draw box */ |
| if (s->draw_box) |
| ff_blend_rectangle(&s->dc, &boxcolor, |
| frame->data, frame->linesize, width, height, |
| s->x - s->boxborderw, s->y - s->boxborderw, |
| box_w + s->boxborderw * 2, box_h + s->boxborderw * 2); |
| |
| if (s->shadowx || s->shadowy) { |
| if ((ret = draw_glyphs(s, frame, width, height, |
| &shadowcolor, s->shadowx, s->shadowy, 0)) < 0) |
| return ret; |
| } |
| |
| if (s->borderw) { |
| if ((ret = draw_glyphs(s, frame, width, height, |
| &bordercolor, 0, 0, s->borderw)) < 0) |
| return ret; |
| } |
| if ((ret = draw_glyphs(s, frame, width, height, |
| &fontcolor, 0, 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) { |
| av_frame_free(&frame); |
| return ret; |
| } |
| #if CONFIG_LIBFRIBIDI |
| if (s->text_shaping) |
| if ((ret = shape_text(ctx)) < 0) { |
| av_frame_free(&frame); |
| return ret; |
| } |
| #endif |
| } |
| |
| s->var_values[VAR_N] = inlink->frame_count_out + 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->var_values[VAR_PKT_POS] = frame->pkt_pos; |
| s->var_values[VAR_PKT_DURATION] = frame->pkt_duration * av_q2d(inlink->time_base); |
| s->var_values[VAR_PKT_SIZE] = frame->pkt_size; |
| s->metadata = frame->metadata; |
| |
| 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, |
| .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 ff_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, |
| .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC, |
| }; |