yading@10: /*
yading@10:  * Copyright (c) 2011 Stefano Sabatini
yading@10:  * Copyright (c) 2010 S.N. Hemanth Meenakshisundaram
yading@10:  * Copyright (c) 2003 Gustavo Sverzut Barbieri <gsbarbieri@yahoo.com.br>
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: /**
yading@10:  * @file
yading@10:  * drawtext filter, based on the original vhook/drawtext.c
yading@10:  * filter by Gustavo Sverzut Barbieri
yading@10:  */
yading@10: 
yading@10: #include <sys/time.h>
yading@10: #include <time.h>
yading@10: 
yading@10: #include "config.h"
yading@10: #include "libavutil/avstring.h"
yading@10: #include "libavutil/bprint.h"
yading@10: #include "libavutil/common.h"
yading@10: #include "libavutil/file.h"
yading@10: #include "libavutil/eval.h"
yading@10: #include "libavutil/opt.h"
yading@10: #include "libavutil/random_seed.h"
yading@10: #include "libavutil/parseutils.h"
yading@10: #include "libavutil/timecode.h"
yading@10: #include "libavutil/tree.h"
yading@10: #include "libavutil/lfg.h"
yading@10: #include "avfilter.h"
yading@10: #include "drawutils.h"
yading@10: #include "formats.h"
yading@10: #include "internal.h"
yading@10: #include "video.h"
yading@10: 
yading@10: #include <ft2build.h>
yading@10: #include <freetype/config/ftheader.h>
yading@10: #include FT_FREETYPE_H
yading@10: #include FT_GLYPH_H
yading@10: #if CONFIG_FONTCONFIG
yading@10: #include <fontconfig/fontconfig.h>
yading@10: #endif
yading@10: 
yading@10: static const char *const var_names[] = {
yading@10:     "dar",
yading@10:     "hsub", "vsub",
yading@10:     "line_h", "lh",           ///< line height, same as max_glyph_h
yading@10:     "main_h", "h", "H",       ///< height of the input video
yading@10:     "main_w", "w", "W",       ///< width  of the input video
yading@10:     "max_glyph_a", "ascent",  ///< max glyph ascent
yading@10:     "max_glyph_d", "descent", ///< min glyph descent
yading@10:     "max_glyph_h",            ///< max glyph height
yading@10:     "max_glyph_w",            ///< max glyph width
yading@10:     "n",                      ///< number of frame
yading@10:     "sar",
yading@10:     "t",                      ///< timestamp expressed in seconds
yading@10:     "text_h", "th",           ///< height of the rendered text
yading@10:     "text_w", "tw",           ///< width  of the rendered text
yading@10:     "x",
yading@10:     "y",
yading@10:     NULL
yading@10: };
yading@10: 
yading@10: static const char *const fun2_names[] = {
yading@10:     "rand"
yading@10: };
yading@10: 
yading@10: static double drand(void *opaque, double min, double max)
yading@10: {
yading@10:     return min + (max-min) / UINT_MAX * av_lfg_get(opaque);
yading@10: }
yading@10: 
yading@10: typedef double (*eval_func2)(void *, double a, double b);
yading@10: 
yading@10: static const eval_func2 fun2[] = {
yading@10:     drand,
yading@10:     NULL
yading@10: };
yading@10: 
yading@10: enum var_name {
yading@10:     VAR_DAR,
yading@10:     VAR_HSUB, VAR_VSUB,
yading@10:     VAR_LINE_H, VAR_LH,
yading@10:     VAR_MAIN_H, VAR_h, VAR_H,
yading@10:     VAR_MAIN_W, VAR_w, VAR_W,
yading@10:     VAR_MAX_GLYPH_A, VAR_ASCENT,
yading@10:     VAR_MAX_GLYPH_D, VAR_DESCENT,
yading@10:     VAR_MAX_GLYPH_H,
yading@10:     VAR_MAX_GLYPH_W,
yading@10:     VAR_N,
yading@10:     VAR_SAR,
yading@10:     VAR_T,
yading@10:     VAR_TEXT_H, VAR_TH,
yading@10:     VAR_TEXT_W, VAR_TW,
yading@10:     VAR_X,
yading@10:     VAR_Y,
yading@10:     VAR_VARS_NB
yading@10: };
yading@10: 
yading@10: enum expansion_mode {
yading@10:     EXP_NONE,
yading@10:     EXP_NORMAL,
yading@10:     EXP_STRFTIME,
yading@10: };
yading@10: 
yading@10: typedef struct {
yading@10:     const AVClass *class;
yading@10:     enum expansion_mode exp_mode;   ///< expansion mode to use for the text
yading@10:     int reinit;                     ///< tells if the filter is being reinited
yading@10:     uint8_t *fontfile;              ///< font to be used
yading@10:     uint8_t *text;                  ///< text to be drawn
yading@10:     AVBPrint expanded_text;         ///< used to contain the expanded text
yading@10:     int ft_load_flags;              ///< flags used for loading fonts, see FT_LOAD_*
yading@10:     FT_Vector *positions;           ///< positions for each element in the text
yading@10:     size_t nb_positions;            ///< number of elements of positions array
yading@10:     char *textfile;                 ///< file with text to be drawn
yading@10:     int x;                          ///< x position to start drawing text
yading@10:     int y;                          ///< y position to start drawing text
yading@10:     int max_glyph_w;                ///< max glyph width
yading@10:     int max_glyph_h;                ///< max glyph height
yading@10:     int shadowx, shadowy;
yading@10:     unsigned int fontsize;          ///< font size to use
yading@10:     char *fontcolor_string;         ///< font color as string
yading@10:     char *boxcolor_string;          ///< box color as string
yading@10:     char *shadowcolor_string;       ///< shadow color as string
yading@10: 
yading@10:     short int draw_box;             ///< draw box around text - true or false
yading@10:     int use_kerning;                ///< font kerning is used - true/false
yading@10:     int tabsize;                    ///< tab size
yading@10:     int fix_bounds;                 ///< do we let it go out of frame bounds - t/f
yading@10: 
yading@10:     FFDrawContext dc;
yading@10:     FFDrawColor fontcolor;          ///< foreground color
yading@10:     FFDrawColor shadowcolor;        ///< shadow color
yading@10:     FFDrawColor boxcolor;           ///< background color
yading@10: 
yading@10:     FT_Library library;             ///< freetype font library handle
yading@10:     FT_Face face;                   ///< freetype font face handle
yading@10:     struct AVTreeNode *glyphs;      ///< rendered glyphs, stored using the UTF-32 char code
yading@10:     char *x_expr;                   ///< expression for x position
yading@10:     char *y_expr;                   ///< expression for y position
yading@10:     AVExpr *x_pexpr, *y_pexpr;      ///< parsed expressions for x and y
yading@10:     int64_t basetime;               ///< base pts time in the real world for display
yading@10:     double var_values[VAR_VARS_NB];
yading@10:     char   *draw_expr;              ///< expression for draw
yading@10:     AVExpr *draw_pexpr;             ///< parsed expression for draw
yading@10:     int draw;                       ///< set to zero to prevent drawing
yading@10:     AVLFG  prng;                    ///< random
yading@10:     char       *tc_opt_string;      ///< specified timecode option string
yading@10:     AVRational  tc_rate;            ///< frame rate for timecode
yading@10:     AVTimecode  tc;                 ///< timecode context
yading@10:     int tc24hmax;                   ///< 1 if timecode is wrapped to 24 hours, 0 otherwise
yading@10:     int frame_id;
yading@10:     int reload;                     ///< reload text file for each frame
yading@10: } DrawTextContext;
yading@10: 
yading@10: #define OFFSET(x) offsetof(DrawTextContext, x)
yading@10: #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
yading@10: 
yading@10: static const AVOption drawtext_options[]= {
yading@10:     {"fontfile",    "set font file",        OFFSET(fontfile),           AV_OPT_TYPE_STRING, {.str=NULL},  CHAR_MIN, CHAR_MAX, FLAGS},
yading@10:     {"text",        "set text",             OFFSET(text),               AV_OPT_TYPE_STRING, {.str=NULL},  CHAR_MIN, CHAR_MAX, FLAGS},
yading@10:     {"textfile",    "set text file",        OFFSET(textfile),           AV_OPT_TYPE_STRING, {.str=NULL},  CHAR_MIN, CHAR_MAX, FLAGS},
yading@10:     {"fontcolor",   "set foreground color", OFFSET(fontcolor_string),   AV_OPT_TYPE_STRING, {.str="black"}, CHAR_MIN, CHAR_MAX, FLAGS},
yading@10:     {"boxcolor",    "set box color",        OFFSET(boxcolor_string),    AV_OPT_TYPE_STRING, {.str="white"}, CHAR_MIN, CHAR_MAX, FLAGS},
yading@10:     {"shadowcolor", "set shadow color",     OFFSET(shadowcolor_string), AV_OPT_TYPE_STRING, {.str="black"}, CHAR_MIN, CHAR_MAX, FLAGS},
yading@10:     {"box",         "set box",              OFFSET(draw_box),           AV_OPT_TYPE_INT,    {.i64=0},     0,        1       , FLAGS},
yading@10:     {"fontsize",    "set font size",        OFFSET(fontsize),           AV_OPT_TYPE_INT,    {.i64=0},     0,        INT_MAX , FLAGS},
yading@10:     {"x",           "set x expression",     OFFSET(x_expr),             AV_OPT_TYPE_STRING, {.str="0"},   CHAR_MIN, CHAR_MAX, FLAGS},
yading@10:     {"y",           "set y expression",     OFFSET(y_expr),             AV_OPT_TYPE_STRING, {.str="0"},   CHAR_MIN, CHAR_MAX, FLAGS},
yading@10:     {"shadowx",     "set x",                OFFSET(shadowx),            AV_OPT_TYPE_INT,    {.i64=0},     INT_MIN,  INT_MAX , FLAGS},
yading@10:     {"shadowy",     "set y",                OFFSET(shadowy),            AV_OPT_TYPE_INT,    {.i64=0},     INT_MIN,  INT_MAX , FLAGS},
yading@10:     {"tabsize",     "set tab size",         OFFSET(tabsize),            AV_OPT_TYPE_INT,    {.i64=4},     0,        INT_MAX , FLAGS},
yading@10:     {"basetime",    "set base time",        OFFSET(basetime),           AV_OPT_TYPE_INT64,  {.i64=AV_NOPTS_VALUE}, INT64_MIN, INT64_MAX , FLAGS},
yading@10:     {"draw",        "if false do not draw", OFFSET(draw_expr),          AV_OPT_TYPE_STRING, {.str="1"},   CHAR_MIN, CHAR_MAX, FLAGS},
yading@10: 
yading@10:     {"expansion", "set the expansion mode", OFFSET(exp_mode), AV_OPT_TYPE_INT, {.i64=EXP_NORMAL}, 0, 2, FLAGS, "expansion"},
yading@10:         {"none",     "set no expansion",                    OFFSET(exp_mode), AV_OPT_TYPE_CONST, {.i64=EXP_NONE},     0, 0, FLAGS, "expansion"},
yading@10:         {"normal",   "set normal expansion",                OFFSET(exp_mode), AV_OPT_TYPE_CONST, {.i64=EXP_NORMAL},   0, 0, FLAGS, "expansion"},
yading@10:         {"strftime", "set strftime expansion (deprecated)", OFFSET(exp_mode), AV_OPT_TYPE_CONST, {.i64=EXP_STRFTIME}, 0, 0, FLAGS, "expansion"},
yading@10: 
yading@10:     {"timecode",        "set initial timecode",             OFFSET(tc_opt_string), AV_OPT_TYPE_STRING,   {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS},
yading@10:     {"tc24hmax",        "set 24 hours max (timecode only)", OFFSET(tc24hmax),      AV_OPT_TYPE_INT,      {.i64=0},           0,        1, FLAGS},
yading@10:     {"timecode_rate",   "set rate (timecode only)",         OFFSET(tc_rate),       AV_OPT_TYPE_RATIONAL, {.dbl=0},           0,  INT_MAX, FLAGS},
yading@10:     {"r",               "set rate (timecode only)",         OFFSET(tc_rate),       AV_OPT_TYPE_RATIONAL, {.dbl=0},           0,  INT_MAX, FLAGS},
yading@10:     {"rate",            "set rate (timecode only)",         OFFSET(tc_rate),       AV_OPT_TYPE_RATIONAL, {.dbl=0},           0,  INT_MAX, FLAGS},
yading@10:     {"reload",     "reload text file for each frame",                       OFFSET(reload),     AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS},
yading@10:     {"fix_bounds", "if true, check and fix text coords to avoid clipping",  OFFSET(fix_bounds), AV_OPT_TYPE_INT, {.i64=1}, 0, 1, FLAGS},
yading@10: 
yading@10:     /* FT_LOAD_* flags */
yading@10:     { "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" },
yading@10:         { "default",                     NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_DEFAULT },                     .flags = FLAGS, .unit = "ft_load_flags" },
yading@10:         { "no_scale",                    NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_SCALE },                    .flags = FLAGS, .unit = "ft_load_flags" },
yading@10:         { "no_hinting",                  NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_HINTING },                  .flags = FLAGS, .unit = "ft_load_flags" },
yading@10:         { "render",                      NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_RENDER },                      .flags = FLAGS, .unit = "ft_load_flags" },
yading@10:         { "no_bitmap",                   NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_BITMAP },                   .flags = FLAGS, .unit = "ft_load_flags" },
yading@10:         { "vertical_layout",             NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_VERTICAL_LAYOUT },             .flags = FLAGS, .unit = "ft_load_flags" },
yading@10:         { "force_autohint",              NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_FORCE_AUTOHINT },              .flags = FLAGS, .unit = "ft_load_flags" },
yading@10:         { "crop_bitmap",                 NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_CROP_BITMAP },                 .flags = FLAGS, .unit = "ft_load_flags" },
yading@10:         { "pedantic",                    NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_PEDANTIC },                    .flags = FLAGS, .unit = "ft_load_flags" },
yading@10:         { "ignore_global_advance_width", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH }, .flags = FLAGS, .unit = "ft_load_flags" },
yading@10:         { "no_recurse",                  NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_RECURSE },                  .flags = FLAGS, .unit = "ft_load_flags" },
yading@10:         { "ignore_transform",            NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_IGNORE_TRANSFORM },            .flags = FLAGS, .unit = "ft_load_flags" },
yading@10:         { "monochrome",                  NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_MONOCHROME },                  .flags = FLAGS, .unit = "ft_load_flags" },
yading@10:         { "linear_design",               NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_LINEAR_DESIGN },               .flags = FLAGS, .unit = "ft_load_flags" },
yading@10:         { "no_autohint",                 NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_AUTOHINT },                 .flags = FLAGS, .unit = "ft_load_flags" },
yading@10:     { NULL},
yading@10: };
yading@10: 
yading@10: AVFILTER_DEFINE_CLASS(drawtext);
yading@10: 
yading@10: #undef __FTERRORS_H__
yading@10: #define FT_ERROR_START_LIST {
yading@10: #define FT_ERRORDEF(e, v, s) { (e), (s) },
yading@10: #define FT_ERROR_END_LIST { 0, NULL } };
yading@10: 
yading@10: struct ft_error
yading@10: {
yading@10:     int err;
yading@10:     const char *err_msg;
yading@10: } static ft_errors[] =
yading@10: #include FT_ERRORS_H
yading@10: 
yading@10: #define FT_ERRMSG(e) ft_errors[e].err_msg
yading@10: 
yading@10: typedef struct {
yading@10:     FT_Glyph *glyph;
yading@10:     uint32_t code;
yading@10:     FT_Bitmap bitmap; ///< array holding bitmaps of font
yading@10:     FT_BBox bbox;
yading@10:     int advance;
yading@10:     int bitmap_left;
yading@10:     int bitmap_top;
yading@10: } Glyph;
yading@10: 
yading@10: static int glyph_cmp(void *key, const void *b)
yading@10: {
yading@10:     const Glyph *a = key, *bb = b;
yading@10:     int64_t diff = (int64_t)a->code - (int64_t)bb->code;
yading@10:     return diff > 0 ? 1 : diff < 0 ? -1 : 0;
yading@10: }
yading@10: 
yading@10: /**
yading@10:  * Load glyphs corresponding to the UTF-32 codepoint code.
yading@10:  */
yading@10: static int load_glyph(AVFilterContext *ctx, Glyph **glyph_ptr, uint32_t code)
yading@10: {
yading@10:     DrawTextContext *dtext = ctx->priv;
yading@10:     Glyph *glyph;
yading@10:     struct AVTreeNode *node = NULL;
yading@10:     int ret;
yading@10: 
yading@10:     /* load glyph into dtext->face->glyph */
yading@10:     if (FT_Load_Char(dtext->face, code, dtext->ft_load_flags))
yading@10:         return AVERROR(EINVAL);
yading@10: 
yading@10:     /* save glyph */
yading@10:     if (!(glyph = av_mallocz(sizeof(*glyph))) ||
yading@10:         !(glyph->glyph = av_mallocz(sizeof(*glyph->glyph)))) {
yading@10:         ret = AVERROR(ENOMEM);
yading@10:         goto error;
yading@10:     }
yading@10:     glyph->code  = code;
yading@10: 
yading@10:     if (FT_Get_Glyph(dtext->face->glyph, glyph->glyph)) {
yading@10:         ret = AVERROR(EINVAL);
yading@10:         goto error;
yading@10:     }
yading@10: 
yading@10:     glyph->bitmap      = dtext->face->glyph->bitmap;
yading@10:     glyph->bitmap_left = dtext->face->glyph->bitmap_left;
yading@10:     glyph->bitmap_top  = dtext->face->glyph->bitmap_top;
yading@10:     glyph->advance     = dtext->face->glyph->advance.x >> 6;
yading@10: 
yading@10:     /* measure text height to calculate text_height (or the maximum text height) */
yading@10:     FT_Glyph_Get_CBox(*glyph->glyph, ft_glyph_bbox_pixels, &glyph->bbox);
yading@10: 
yading@10:     /* cache the newly created glyph */
yading@10:     if (!(node = av_tree_node_alloc())) {
yading@10:         ret = AVERROR(ENOMEM);
yading@10:         goto error;
yading@10:     }
yading@10:     av_tree_insert(&dtext->glyphs, glyph, glyph_cmp, &node);
yading@10: 
yading@10:     if (glyph_ptr)
yading@10:         *glyph_ptr = glyph;
yading@10:     return 0;
yading@10: 
yading@10: error:
yading@10:     if (glyph)
yading@10:         av_freep(&glyph->glyph);
yading@10:     av_freep(&glyph);
yading@10:     av_freep(&node);
yading@10:     return ret;
yading@10: }
yading@10: 
yading@10: static int load_font_file(AVFilterContext *ctx, const char *path, int index,
yading@10:                           const char **error)
yading@10: {
yading@10:     DrawTextContext *dtext = ctx->priv;
yading@10:     int err;
yading@10: 
yading@10:     err = FT_New_Face(dtext->library, path, index, &dtext->face);
yading@10:     if (err) {
yading@10:         *error = FT_ERRMSG(err);
yading@10:         return AVERROR(EINVAL);
yading@10:     }
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: #if CONFIG_FONTCONFIG
yading@10: static int load_font_fontconfig(AVFilterContext *ctx, const char **error)
yading@10: {
yading@10:     DrawTextContext *dtext = ctx->priv;
yading@10:     FcConfig *fontconfig;
yading@10:     FcPattern *pattern, *fpat;
yading@10:     FcResult result = FcResultMatch;
yading@10:     FcChar8 *filename;
yading@10:     int err, index;
yading@10:     double size;
yading@10: 
yading@10:     fontconfig = FcInitLoadConfigAndFonts();
yading@10:     if (!fontconfig) {
yading@10:         *error = "impossible to init fontconfig\n";
yading@10:         return AVERROR(EINVAL);
yading@10:     }
yading@10:     pattern = FcNameParse(dtext->fontfile ? dtext->fontfile :
yading@10:                           (uint8_t *)(intptr_t)"default");
yading@10:     if (!pattern) {
yading@10:         *error = "could not parse fontconfig pattern";
yading@10:         return AVERROR(EINVAL);
yading@10:     }
yading@10:     if (!FcConfigSubstitute(fontconfig, pattern, FcMatchPattern)) {
yading@10:         *error = "could not substitue fontconfig options"; /* very unlikely */
yading@10:         return AVERROR(EINVAL);
yading@10:     }
yading@10:     FcDefaultSubstitute(pattern);
yading@10:     fpat = FcFontMatch(fontconfig, pattern, &result);
yading@10:     if (!fpat || result != FcResultMatch) {
yading@10:         *error = "impossible to find a matching font";
yading@10:         return AVERROR(EINVAL);
yading@10:     }
yading@10:     if (FcPatternGetString (fpat, FC_FILE,  0, &filename) != FcResultMatch ||
yading@10:         FcPatternGetInteger(fpat, FC_INDEX, 0, &index   ) != FcResultMatch ||
yading@10:         FcPatternGetDouble (fpat, FC_SIZE,  0, &size    ) != FcResultMatch) {
yading@10:         *error = "impossible to find font information";
yading@10:         return AVERROR(EINVAL);
yading@10:     }
yading@10:     av_log(ctx, AV_LOG_INFO, "Using \"%s\"\n", filename);
yading@10:     if (!dtext->fontsize)
yading@10:         dtext->fontsize = size + 0.5;
yading@10:     err = load_font_file(ctx, filename, index, error);
yading@10:     if (err)
yading@10:         return err;
yading@10:     FcPatternDestroy(fpat);
yading@10:     FcPatternDestroy(pattern);
yading@10:     FcConfigDestroy(fontconfig);
yading@10:     return 0;
yading@10: }
yading@10: #endif
yading@10: 
yading@10: static int load_font(AVFilterContext *ctx)
yading@10: {
yading@10:     DrawTextContext *dtext = ctx->priv;
yading@10:     int err;
yading@10:     const char *error = "unknown error\n";
yading@10: 
yading@10:     /* load the face, and set up the encoding, which is by default UTF-8 */
yading@10:     err = load_font_file(ctx, dtext->fontfile, 0, &error);
yading@10:     if (!err)
yading@10:         return 0;
yading@10: #if CONFIG_FONTCONFIG
yading@10:     err = load_font_fontconfig(ctx, &error);
yading@10:     if (!err)
yading@10:         return 0;
yading@10: #endif
yading@10:     av_log(ctx, AV_LOG_ERROR, "Could not load font \"%s\": %s\n",
yading@10:            dtext->fontfile, error);
yading@10:     return err;
yading@10: }
yading@10: 
yading@10: static int load_textfile(AVFilterContext *ctx)
yading@10: {
yading@10:     DrawTextContext *dtext = ctx->priv;
yading@10:     int err;
yading@10:     uint8_t *textbuf;
yading@10:     size_t textbuf_size;
yading@10: 
yading@10:     if ((err = av_file_map(dtext->textfile, &textbuf, &textbuf_size, 0, ctx)) < 0) {
yading@10:         av_log(ctx, AV_LOG_ERROR,
yading@10:                "The text file '%s' could not be read or is empty\n",
yading@10:                dtext->textfile);
yading@10:         return err;
yading@10:     }
yading@10: 
yading@10:     if (!(dtext->text = av_realloc(dtext->text, textbuf_size + 1)))
yading@10:         return AVERROR(ENOMEM);
yading@10:     memcpy(dtext->text, textbuf, textbuf_size);
yading@10:     dtext->text[textbuf_size] = 0;
yading@10:     av_file_unmap(textbuf, textbuf_size);
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static av_cold int init(AVFilterContext *ctx)
yading@10: {
yading@10:     int err;
yading@10:     DrawTextContext *dtext = ctx->priv;
yading@10:     Glyph *glyph;
yading@10: 
yading@10:     if (!dtext->fontfile && !CONFIG_FONTCONFIG) {
yading@10:         av_log(ctx, AV_LOG_ERROR, "No font filename provided\n");
yading@10:         return AVERROR(EINVAL);
yading@10:     }
yading@10: 
yading@10:     if (dtext->textfile) {
yading@10:         if (dtext->text) {
yading@10:             av_log(ctx, AV_LOG_ERROR,
yading@10:                    "Both text and text file provided. Please provide only one\n");
yading@10:             return AVERROR(EINVAL);
yading@10:         }
yading@10:         if ((err = load_textfile(ctx)) < 0)
yading@10:             return err;
yading@10:     }
yading@10: 
yading@10:     if (dtext->reload && !dtext->textfile)
yading@10:         av_log(ctx, AV_LOG_WARNING, "No file to reload\n");
yading@10: 
yading@10:     if (dtext->tc_opt_string) {
yading@10:         int ret = av_timecode_init_from_string(&dtext->tc, dtext->tc_rate,
yading@10:                                                dtext->tc_opt_string, ctx);
yading@10:         if (ret < 0)
yading@10:             return ret;
yading@10:         if (dtext->tc24hmax)
yading@10:             dtext->tc.flags |= AV_TIMECODE_FLAG_24HOURSMAX;
yading@10:         if (!dtext->text)
yading@10:             dtext->text = av_strdup("");
yading@10:     }
yading@10: 
yading@10:     if (!dtext->text) {
yading@10:         av_log(ctx, AV_LOG_ERROR,
yading@10:                "Either text, a valid file or a timecode must be provided\n");
yading@10:         return AVERROR(EINVAL);
yading@10:     }
yading@10: 
yading@10:     if ((err = av_parse_color(dtext->fontcolor.rgba, dtext->fontcolor_string, -1, ctx))) {
yading@10:         av_log(ctx, AV_LOG_ERROR,
yading@10:                "Invalid font color '%s'\n", dtext->fontcolor_string);
yading@10:         return err;
yading@10:     }
yading@10: 
yading@10:     if ((err = av_parse_color(dtext->boxcolor.rgba, dtext->boxcolor_string, -1, ctx))) {
yading@10:         av_log(ctx, AV_LOG_ERROR,
yading@10:                "Invalid box color '%s'\n", dtext->boxcolor_string);
yading@10:         return err;
yading@10:     }
yading@10: 
yading@10:     if ((err = av_parse_color(dtext->shadowcolor.rgba, dtext->shadowcolor_string, -1, ctx))) {
yading@10:         av_log(ctx, AV_LOG_ERROR,
yading@10:                "Invalid shadow color '%s'\n", dtext->shadowcolor_string);
yading@10:         return err;
yading@10:     }
yading@10: 
yading@10:     if ((err = FT_Init_FreeType(&(dtext->library)))) {
yading@10:         av_log(ctx, AV_LOG_ERROR,
yading@10:                "Could not load FreeType: %s\n", FT_ERRMSG(err));
yading@10:         return AVERROR(EINVAL);
yading@10:     }
yading@10: 
yading@10:     err = load_font(ctx);
yading@10:     if (err)
yading@10:         return err;
yading@10:     if (!dtext->fontsize)
yading@10:         dtext->fontsize = 16;
yading@10:     if ((err = FT_Set_Pixel_Sizes(dtext->face, 0, dtext->fontsize))) {
yading@10:         av_log(ctx, AV_LOG_ERROR, "Could not set font size to %d pixels: %s\n",
yading@10:                dtext->fontsize, FT_ERRMSG(err));
yading@10:         return AVERROR(EINVAL);
yading@10:     }
yading@10: 
yading@10:     dtext->use_kerning = FT_HAS_KERNING(dtext->face);
yading@10: 
yading@10:     /* load the fallback glyph with code 0 */
yading@10:     load_glyph(ctx, NULL, 0);
yading@10: 
yading@10:     /* set the tabsize in pixels */
yading@10:     if ((err = load_glyph(ctx, &glyph, ' ')) < 0) {
yading@10:         av_log(ctx, AV_LOG_ERROR, "Could not set tabsize.\n");
yading@10:         return err;
yading@10:     }
yading@10:     dtext->tabsize *= glyph->advance;
yading@10: 
yading@10:     if (dtext->exp_mode == EXP_STRFTIME &&
yading@10:         (strchr(dtext->text, '%') || strchr(dtext->text, '\\')))
yading@10:         av_log(ctx, AV_LOG_WARNING, "expansion=strftime is deprecated.\n");
yading@10: 
yading@10:     av_bprint_init(&dtext->expanded_text, 0, AV_BPRINT_SIZE_UNLIMITED);
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int query_formats(AVFilterContext *ctx)
yading@10: {
yading@10:     ff_set_common_formats(ctx, ff_draw_supported_pixel_formats(0));
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int glyph_enu_free(void *opaque, void *elem)
yading@10: {
yading@10:     Glyph *glyph = elem;
yading@10: 
yading@10:     FT_Done_Glyph(*glyph->glyph);
yading@10:     av_freep(&glyph->glyph);
yading@10:     av_free(elem);
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static av_cold void uninit(AVFilterContext *ctx)
yading@10: {
yading@10:     DrawTextContext *dtext = ctx->priv;
yading@10: 
yading@10:     av_expr_free(dtext->x_pexpr); dtext->x_pexpr = NULL;
yading@10:     av_expr_free(dtext->y_pexpr); dtext->y_pexpr = NULL;
yading@10:     av_expr_free(dtext->draw_pexpr); dtext->draw_pexpr = NULL;
yading@10: 
yading@10:     av_freep(&dtext->positions);
yading@10:     dtext->nb_positions = 0;
yading@10: 
yading@10: 
yading@10:     av_tree_enumerate(dtext->glyphs, NULL, NULL, glyph_enu_free);
yading@10:     av_tree_destroy(dtext->glyphs);
yading@10:     dtext->glyphs = NULL;
yading@10: 
yading@10:     FT_Done_Face(dtext->face);
yading@10:     FT_Done_FreeType(dtext->library);
yading@10: 
yading@10:     av_bprint_finalize(&dtext->expanded_text, NULL);
yading@10: }
yading@10: 
yading@10: static inline int is_newline(uint32_t c)
yading@10: {
yading@10:     return c == '\n' || c == '\r' || c == '\f' || c == '\v';
yading@10: }
yading@10: 
yading@10: static int config_input(AVFilterLink *inlink)
yading@10: {
yading@10:     AVFilterContext *ctx = inlink->dst;
yading@10:     DrawTextContext *dtext = ctx->priv;
yading@10:     int ret;
yading@10: 
yading@10:     ff_draw_init(&dtext->dc, inlink->format, 0);
yading@10:     ff_draw_color(&dtext->dc, &dtext->fontcolor,   dtext->fontcolor.rgba);
yading@10:     ff_draw_color(&dtext->dc, &dtext->shadowcolor, dtext->shadowcolor.rgba);
yading@10:     ff_draw_color(&dtext->dc, &dtext->boxcolor,    dtext->boxcolor.rgba);
yading@10: 
yading@10:     dtext->var_values[VAR_w]     = dtext->var_values[VAR_W]     = dtext->var_values[VAR_MAIN_W] = inlink->w;
yading@10:     dtext->var_values[VAR_h]     = dtext->var_values[VAR_H]     = dtext->var_values[VAR_MAIN_H] = inlink->h;
yading@10:     dtext->var_values[VAR_SAR]   = inlink->sample_aspect_ratio.num ? av_q2d(inlink->sample_aspect_ratio) : 1;
yading@10:     dtext->var_values[VAR_DAR]   = (double)inlink->w / inlink->h * dtext->var_values[VAR_SAR];
yading@10:     dtext->var_values[VAR_HSUB]  = 1 << dtext->dc.hsub_max;
yading@10:     dtext->var_values[VAR_VSUB]  = 1 << dtext->dc.vsub_max;
yading@10:     dtext->var_values[VAR_X]     = NAN;
yading@10:     dtext->var_values[VAR_Y]     = NAN;
yading@10:     if (!dtext->reinit)
yading@10:         dtext->var_values[VAR_N] = 0;
yading@10:     dtext->var_values[VAR_T]     = NAN;
yading@10: 
yading@10:     av_lfg_init(&dtext->prng, av_get_random_seed());
yading@10: 
yading@10:     if ((ret = av_expr_parse(&dtext->x_pexpr, dtext->x_expr, var_names,
yading@10:                              NULL, NULL, fun2_names, fun2, 0, ctx)) < 0 ||
yading@10:         (ret = av_expr_parse(&dtext->y_pexpr, dtext->y_expr, var_names,
yading@10:                              NULL, NULL, fun2_names, fun2, 0, ctx)) < 0 ||
yading@10:         (ret = av_expr_parse(&dtext->draw_pexpr, dtext->draw_expr, var_names,
yading@10:                              NULL, NULL, fun2_names, fun2, 0, ctx)) < 0)
yading@10: 
yading@10:         return AVERROR(EINVAL);
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int command(AVFilterContext *ctx, const char *cmd, const char *arg, char *res, int res_len, int flags)
yading@10: {
yading@10:     DrawTextContext *dtext = ctx->priv;
yading@10: 
yading@10:     if (!strcmp(cmd, "reinit")) {
yading@10:         int ret;
yading@10:         uninit(ctx);
yading@10:         dtext->reinit = 1;
yading@10:         if ((ret = init(ctx)) < 0)
yading@10:             return ret;
yading@10:         return config_input(ctx->inputs[0]);
yading@10:     }
yading@10: 
yading@10:     return AVERROR(ENOSYS);
yading@10: }
yading@10: 
yading@10: static int func_pts(AVFilterContext *ctx, AVBPrint *bp,
yading@10:                     char *fct, unsigned argc, char **argv, int tag)
yading@10: {
yading@10:     DrawTextContext *dtext = ctx->priv;
yading@10: 
yading@10:     av_bprintf(bp, "%.6f", dtext->var_values[VAR_T]);
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int func_frame_num(AVFilterContext *ctx, AVBPrint *bp,
yading@10:                           char *fct, unsigned argc, char **argv, int tag)
yading@10: {
yading@10:     DrawTextContext *dtext = ctx->priv;
yading@10: 
yading@10:     av_bprintf(bp, "%d", (int)dtext->var_values[VAR_N]);
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: #if !HAVE_LOCALTIME_R
yading@10: static void localtime_r(const time_t *t, struct tm *tm)
yading@10: {
yading@10:     *tm = *localtime(t);
yading@10: }
yading@10: #endif
yading@10: 
yading@10: static int func_strftime(AVFilterContext *ctx, AVBPrint *bp,
yading@10:                          char *fct, unsigned argc, char **argv, int tag)
yading@10: {
yading@10:     const char *fmt = argc ? argv[0] : "%Y-%m-%d %H:%M:%S";
yading@10:     time_t now;
yading@10:     struct tm tm;
yading@10: 
yading@10:     time(&now);
yading@10:     if (tag == 'L')
yading@10:         localtime_r(&now, &tm);
yading@10:     else
yading@10:         tm = *gmtime(&now);
yading@10:     av_bprint_strftime(bp, fmt, &tm);
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int func_eval_expr(AVFilterContext *ctx, AVBPrint *bp,
yading@10:                           char *fct, unsigned argc, char **argv, int tag)
yading@10: {
yading@10:     DrawTextContext *dtext = ctx->priv;
yading@10:     double res;
yading@10:     int ret;
yading@10: 
yading@10:     ret = av_expr_parse_and_eval(&res, argv[0], var_names, dtext->var_values,
yading@10:                                  NULL, NULL, fun2_names, fun2,
yading@10:                                  &dtext->prng, 0, ctx);
yading@10:     if (ret < 0)
yading@10:         av_log(ctx, AV_LOG_ERROR,
yading@10:                "Expression '%s' for the expr text expansion function is not valid\n",
yading@10:                argv[0]);
yading@10:     else
yading@10:         av_bprintf(bp, "%f", res);
yading@10: 
yading@10:     return ret;
yading@10: }
yading@10: 
yading@10: static const struct drawtext_function {
yading@10:     const char *name;
yading@10:     unsigned argc_min, argc_max;
yading@10:     int tag; /** opaque argument to func */
yading@10:     int (*func)(AVFilterContext *, AVBPrint *, char *, unsigned, char **, int);
yading@10: } functions[] = {
yading@10:     { "expr",      1, 1, 0,   func_eval_expr },
yading@10:     { "e",         1, 1, 0,   func_eval_expr },
yading@10:     { "pts",       0, 0, 0,   func_pts      },
yading@10:     { "gmtime",    0, 1, 'G', func_strftime },
yading@10:     { "localtime", 0, 1, 'L', func_strftime },
yading@10:     { "frame_num", 0, 0, 0,   func_frame_num },
yading@10:     { "n",         0, 0, 0,   func_frame_num },
yading@10: };
yading@10: 
yading@10: static int eval_function(AVFilterContext *ctx, AVBPrint *bp, char *fct,
yading@10:                          unsigned argc, char **argv)
yading@10: {
yading@10:     unsigned i;
yading@10: 
yading@10:     for (i = 0; i < FF_ARRAY_ELEMS(functions); i++) {
yading@10:         if (strcmp(fct, functions[i].name))
yading@10:             continue;
yading@10:         if (argc < functions[i].argc_min) {
yading@10:             av_log(ctx, AV_LOG_ERROR, "%%{%s} requires at least %d arguments\n",
yading@10:                    fct, functions[i].argc_min);
yading@10:             return AVERROR(EINVAL);
yading@10:         }
yading@10:         if (argc > functions[i].argc_max) {
yading@10:             av_log(ctx, AV_LOG_ERROR, "%%{%s} requires at most %d arguments\n",
yading@10:                    fct, functions[i].argc_max);
yading@10:             return AVERROR(EINVAL);
yading@10:         }
yading@10:         break;
yading@10:     }
yading@10:     if (i >= FF_ARRAY_ELEMS(functions)) {
yading@10:         av_log(ctx, AV_LOG_ERROR, "%%{%s} is not known\n", fct);
yading@10:         return AVERROR(EINVAL);
yading@10:     }
yading@10:     return functions[i].func(ctx, bp, fct, argc, argv, functions[i].tag);
yading@10: }
yading@10: 
yading@10: static int expand_function(AVFilterContext *ctx, AVBPrint *bp, char **rtext)
yading@10: {
yading@10:     const char *text = *rtext;
yading@10:     char *argv[16] = { NULL };
yading@10:     unsigned argc = 0, i;
yading@10:     int ret;
yading@10: 
yading@10:     if (*text != '{') {
yading@10:         av_log(ctx, AV_LOG_ERROR, "Stray %% near '%s'\n", text);
yading@10:         return AVERROR(EINVAL);
yading@10:     }
yading@10:     text++;
yading@10:     while (1) {
yading@10:         if (!(argv[argc++] = av_get_token(&text, ":}"))) {
yading@10:             ret = AVERROR(ENOMEM);
yading@10:             goto end;
yading@10:         }
yading@10:         if (!*text) {
yading@10:             av_log(ctx, AV_LOG_ERROR, "Unterminated %%{} near '%s'\n", *rtext);
yading@10:             ret = AVERROR(EINVAL);
yading@10:             goto end;
yading@10:         }
yading@10:         if (argc == FF_ARRAY_ELEMS(argv))
yading@10:             av_freep(&argv[--argc]); /* error will be caught later */
yading@10:         if (*text == '}')
yading@10:             break;
yading@10:         text++;
yading@10:     }
yading@10: 
yading@10:     if ((ret = eval_function(ctx, bp, argv[0], argc - 1, argv + 1)) < 0)
yading@10:         goto end;
yading@10:     ret = 0;
yading@10:     *rtext = (char *)text + 1;
yading@10: 
yading@10: end:
yading@10:     for (i = 0; i < argc; i++)
yading@10:         av_freep(&argv[i]);
yading@10:     return ret;
yading@10: }
yading@10: 
yading@10: static int expand_text(AVFilterContext *ctx)
yading@10: {
yading@10:     DrawTextContext *dtext = ctx->priv;
yading@10:     char *text = dtext->text;
yading@10:     AVBPrint *bp = &dtext->expanded_text;
yading@10:     int ret;
yading@10: 
yading@10:     av_bprint_clear(bp);
yading@10:     while (*text) {
yading@10:         if (*text == '\\' && text[1]) {
yading@10:             av_bprint_chars(bp, text[1], 1);
yading@10:             text += 2;
yading@10:         } else if (*text == '%') {
yading@10:             text++;
yading@10:             if ((ret = expand_function(ctx, bp, &text)) < 0)
yading@10:                 return ret;
yading@10:         } else {
yading@10:             av_bprint_chars(bp, *text, 1);
yading@10:             text++;
yading@10:         }
yading@10:     }
yading@10:     if (!av_bprint_is_complete(bp))
yading@10:         return AVERROR(ENOMEM);
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int draw_glyphs(DrawTextContext *dtext, AVFrame *frame,
yading@10:                        int width, int height, const uint8_t rgbcolor[4], FFDrawColor *color, int x, int y)
yading@10: {
yading@10:     char *text = dtext->expanded_text.str;
yading@10:     uint32_t code = 0;
yading@10:     int i, x1, y1;
yading@10:     uint8_t *p;
yading@10:     Glyph *glyph = NULL;
yading@10: 
yading@10:     for (i = 0, p = text; *p; i++) {
yading@10:         Glyph dummy = { 0 };
yading@10:         GET_UTF8(code, *p++, continue;);
yading@10: 
yading@10:         /* skip new line chars, just go to new line */
yading@10:         if (code == '\n' || code == '\r' || code == '\t')
yading@10:             continue;
yading@10: 
yading@10:         dummy.code = code;
yading@10:         glyph = av_tree_find(dtext->glyphs, &dummy, (void *)glyph_cmp, NULL);
yading@10: 
yading@10:         if (glyph->bitmap.pixel_mode != FT_PIXEL_MODE_MONO &&
yading@10:             glyph->bitmap.pixel_mode != FT_PIXEL_MODE_GRAY)
yading@10:             return AVERROR(EINVAL);
yading@10: 
yading@10:         x1 = dtext->positions[i].x+dtext->x+x;
yading@10:         y1 = dtext->positions[i].y+dtext->y+y;
yading@10: 
yading@10:         ff_blend_mask(&dtext->dc, color,
yading@10:                       frame->data, frame->linesize, width, height,
yading@10:                       glyph->bitmap.buffer, glyph->bitmap.pitch,
yading@10:                       glyph->bitmap.width, glyph->bitmap.rows,
yading@10:                       glyph->bitmap.pixel_mode == FT_PIXEL_MODE_MONO ? 0 : 3,
yading@10:                       0, x1, y1);
yading@10:     }
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int draw_text(AVFilterContext *ctx, AVFrame *frame,
yading@10:                      int width, int height)
yading@10: {
yading@10:     DrawTextContext *dtext = ctx->priv;
yading@10:     uint32_t code = 0, prev_code = 0;
yading@10:     int x = 0, y = 0, i = 0, ret;
yading@10:     int max_text_line_w = 0, len;
yading@10:     int box_w, box_h;
yading@10:     char *text = dtext->text;
yading@10:     uint8_t *p;
yading@10:     int y_min = 32000, y_max = -32000;
yading@10:     int x_min = 32000, x_max = -32000;
yading@10:     FT_Vector delta;
yading@10:     Glyph *glyph = NULL, *prev_glyph = NULL;
yading@10:     Glyph dummy = { 0 };
yading@10: 
yading@10:     time_t now = time(0);
yading@10:     struct tm ltime;
yading@10:     AVBPrint *bp = &dtext->expanded_text;
yading@10: 
yading@10:     av_bprint_clear(bp);
yading@10: 
yading@10:     if(dtext->basetime != AV_NOPTS_VALUE)
yading@10:         now= frame->pts*av_q2d(ctx->inputs[0]->time_base) + dtext->basetime/1000000;
yading@10: 
yading@10:     switch (dtext->exp_mode) {
yading@10:     case EXP_NONE:
yading@10:         av_bprintf(bp, "%s", dtext->text);
yading@10:         break;
yading@10:     case EXP_NORMAL:
yading@10:         if ((ret = expand_text(ctx)) < 0)
yading@10:             return ret;
yading@10:         break;
yading@10:     case EXP_STRFTIME:
yading@10:         localtime_r(&now, &ltime);
yading@10:         av_bprint_strftime(bp, dtext->text, &ltime);
yading@10:         break;
yading@10:     }
yading@10: 
yading@10:     if (dtext->tc_opt_string) {
yading@10:         char tcbuf[AV_TIMECODE_STR_SIZE];
yading@10:         av_timecode_make_string(&dtext->tc, tcbuf, dtext->frame_id++);
yading@10:         av_bprint_clear(bp);
yading@10:         av_bprintf(bp, "%s%s", dtext->text, tcbuf);
yading@10:     }
yading@10: 
yading@10:     if (!av_bprint_is_complete(bp))
yading@10:         return AVERROR(ENOMEM);
yading@10:     text = dtext->expanded_text.str;
yading@10:     if ((len = dtext->expanded_text.len) > dtext->nb_positions) {
yading@10:         if (!(dtext->positions =
yading@10:               av_realloc(dtext->positions, len*sizeof(*dtext->positions))))
yading@10:             return AVERROR(ENOMEM);
yading@10:         dtext->nb_positions = len;
yading@10:     }
yading@10: 
yading@10:     x = 0;
yading@10:     y = 0;
yading@10: 
yading@10:     /* load and cache glyphs */
yading@10:     for (i = 0, p = text; *p; i++) {
yading@10:         GET_UTF8(code, *p++, continue;);
yading@10: 
yading@10:         /* get glyph */
yading@10:         dummy.code = code;
yading@10:         glyph = av_tree_find(dtext->glyphs, &dummy, glyph_cmp, NULL);
yading@10:         if (!glyph) {
yading@10:             load_glyph(ctx, &glyph, code);
yading@10:         }
yading@10: 
yading@10:         y_min = FFMIN(glyph->bbox.yMin, y_min);
yading@10:         y_max = FFMAX(glyph->bbox.yMax, y_max);
yading@10:         x_min = FFMIN(glyph->bbox.xMin, x_min);
yading@10:         x_max = FFMAX(glyph->bbox.xMax, x_max);
yading@10:     }
yading@10:     dtext->max_glyph_h = y_max - y_min;
yading@10:     dtext->max_glyph_w = x_max - x_min;
yading@10: 
yading@10:     /* compute and save position for each glyph */
yading@10:     glyph = NULL;
yading@10:     for (i = 0, p = text; *p; i++) {
yading@10:         GET_UTF8(code, *p++, continue;);
yading@10: 
yading@10:         /* skip the \n in the sequence \r\n */
yading@10:         if (prev_code == '\r' && code == '\n')
yading@10:             continue;
yading@10: 
yading@10:         prev_code = code;
yading@10:         if (is_newline(code)) {
yading@10:             max_text_line_w = FFMAX(max_text_line_w, x);
yading@10:             y += dtext->max_glyph_h;
yading@10:             x = 0;
yading@10:             continue;
yading@10:         }
yading@10: 
yading@10:         /* get glyph */
yading@10:         prev_glyph = glyph;
yading@10:         dummy.code = code;
yading@10:         glyph = av_tree_find(dtext->glyphs, &dummy, glyph_cmp, NULL);
yading@10: 
yading@10:         /* kerning */
yading@10:         if (dtext->use_kerning && prev_glyph && glyph->code) {
yading@10:             FT_Get_Kerning(dtext->face, prev_glyph->code, glyph->code,
yading@10:                            ft_kerning_default, &delta);
yading@10:             x += delta.x >> 6;
yading@10:         }
yading@10: 
yading@10:         /* save position */
yading@10:         dtext->positions[i].x = x + glyph->bitmap_left;
yading@10:         dtext->positions[i].y = y - glyph->bitmap_top + y_max;
yading@10:         if (code == '\t') x  = (x / dtext->tabsize + 1)*dtext->tabsize;
yading@10:         else              x += glyph->advance;
yading@10:     }
yading@10: 
yading@10:     max_text_line_w = FFMAX(x, max_text_line_w);
yading@10: 
yading@10:     dtext->var_values[VAR_TW] = dtext->var_values[VAR_TEXT_W] = max_text_line_w;
yading@10:     dtext->var_values[VAR_TH] = dtext->var_values[VAR_TEXT_H] = y + dtext->max_glyph_h;
yading@10: 
yading@10:     dtext->var_values[VAR_MAX_GLYPH_W] = dtext->max_glyph_w;
yading@10:     dtext->var_values[VAR_MAX_GLYPH_H] = dtext->max_glyph_h;
yading@10:     dtext->var_values[VAR_MAX_GLYPH_A] = dtext->var_values[VAR_ASCENT ] = y_max;
yading@10:     dtext->var_values[VAR_MAX_GLYPH_D] = dtext->var_values[VAR_DESCENT] = y_min;
yading@10: 
yading@10:     dtext->var_values[VAR_LINE_H] = dtext->var_values[VAR_LH] = dtext->max_glyph_h;
yading@10: 
yading@10:     dtext->x = dtext->var_values[VAR_X] = av_expr_eval(dtext->x_pexpr, dtext->var_values, &dtext->prng);
yading@10:     dtext->y = dtext->var_values[VAR_Y] = av_expr_eval(dtext->y_pexpr, dtext->var_values, &dtext->prng);
yading@10:     dtext->x = dtext->var_values[VAR_X] = av_expr_eval(dtext->x_pexpr, dtext->var_values, &dtext->prng);
yading@10:     dtext->draw = av_expr_eval(dtext->draw_pexpr, dtext->var_values, &dtext->prng);
yading@10: 
yading@10:     if(!dtext->draw)
yading@10:         return 0;
yading@10: 
yading@10:     box_w = FFMIN(width - 1 , max_text_line_w);
yading@10:     box_h = FFMIN(height - 1, y + dtext->max_glyph_h);
yading@10: 
yading@10:     /* draw box */
yading@10:     if (dtext->draw_box)
yading@10:         ff_blend_rectangle(&dtext->dc, &dtext->boxcolor,
yading@10:                            frame->data, frame->linesize, width, height,
yading@10:                            dtext->x, dtext->y, box_w, box_h);
yading@10: 
yading@10:     if (dtext->shadowx || dtext->shadowy) {
yading@10:         if ((ret = draw_glyphs(dtext, frame, width, height, dtext->shadowcolor.rgba,
yading@10:                                &dtext->shadowcolor, dtext->shadowx, dtext->shadowy)) < 0)
yading@10:             return ret;
yading@10:     }
yading@10: 
yading@10:     if ((ret = draw_glyphs(dtext, frame, width, height, dtext->fontcolor.rgba,
yading@10:                            &dtext->fontcolor, 0, 0)) < 0)
yading@10:         return ret;
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
yading@10: {
yading@10:     AVFilterContext *ctx = inlink->dst;
yading@10:     AVFilterLink *outlink = ctx->outputs[0];
yading@10:     DrawTextContext *dtext = ctx->priv;
yading@10:     int ret;
yading@10: 
yading@10:     if (dtext->reload)
yading@10:         if ((ret = load_textfile(ctx)) < 0)
yading@10:             return ret;
yading@10: 
yading@10:     dtext->var_values[VAR_T] = frame->pts == AV_NOPTS_VALUE ?
yading@10:         NAN : frame->pts * av_q2d(inlink->time_base);
yading@10: 
yading@10:     draw_text(ctx, frame, frame->width, frame->height);
yading@10: 
yading@10:     av_log(ctx, AV_LOG_DEBUG, "n:%d t:%f text_w:%d text_h:%d x:%d y:%d\n",
yading@10:            (int)dtext->var_values[VAR_N], dtext->var_values[VAR_T],
yading@10:            (int)dtext->var_values[VAR_TEXT_W], (int)dtext->var_values[VAR_TEXT_H],
yading@10:            dtext->x, dtext->y);
yading@10: 
yading@10:     dtext->var_values[VAR_N] += 1.0;
yading@10: 
yading@10:     return ff_filter_frame(outlink, frame);
yading@10: }
yading@10: 
yading@10: static const AVFilterPad avfilter_vf_drawtext_inputs[] = {
yading@10:     {
yading@10:         .name             = "default",
yading@10:         .type             = AVMEDIA_TYPE_VIDEO,
yading@10:         .get_video_buffer = ff_null_get_video_buffer,
yading@10:         .filter_frame     = filter_frame,
yading@10:         .config_props     = config_input,
yading@10:         .needs_writable   = 1,
yading@10:     },
yading@10:     { NULL }
yading@10: };
yading@10: 
yading@10: static const AVFilterPad avfilter_vf_drawtext_outputs[] = {
yading@10:     {
yading@10:         .name = "default",
yading@10:         .type = AVMEDIA_TYPE_VIDEO,
yading@10:     },
yading@10:     { NULL }
yading@10: };
yading@10: 
yading@10: AVFilter avfilter_vf_drawtext = {
yading@10:     .name          = "drawtext",
yading@10:     .description   = NULL_IF_CONFIG_SMALL("Draw text on top of video frames using libfreetype library."),
yading@10:     .priv_size     = sizeof(DrawTextContext),
yading@10:     .priv_class    = &drawtext_class,
yading@10:     .init          = init,
yading@10:     .uninit        = uninit,
yading@10:     .query_formats = query_formats,
yading@10: 
yading@10:     .inputs    = avfilter_vf_drawtext_inputs,
yading@10:     .outputs   = avfilter_vf_drawtext_outputs,
yading@10:     .process_command = command,
yading@10: };