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1
/*
2
 * Copyright (c) 2011 Stefano Sabatini
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 * Copyright (c) 2010 S.N. Hemanth Meenakshisundaram
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 * Copyright (c) 2003 Gustavo Sverzut Barbieri <gsbarbieri@yahoo.com.br>
5
 *
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 * This file is part of FFmpeg.
7
 *
8
 * FFmpeg is free software; you can redistribute it and/or
9
 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
12
 *
13
 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
18
 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
22

    
23
/**
24
 * @file
25
 * drawtext filter, based on the original FFmpeg vhook/drawtext.c
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 * filter by Gustavo Sverzut Barbieri
27
 */
28

    
29
#include <sys/time.h>
30
#include <time.h>
31

    
32
#include "libavutil/colorspace.h"
33
#include "libavutil/file.h"
34
#include "libavutil/opt.h"
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#include "libavutil/parseutils.h"
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#include "libavutil/pixdesc.h"
37
#include "libavutil/tree.h"
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#include "avfilter.h"
39
#include "drawutils.h"
40

    
41
#undef time
42

    
43
#include <ft2build.h>
44
#include <freetype/config/ftheader.h>
45
#include FT_FREETYPE_H
46
#include FT_GLYPH_H
47

    
48
typedef struct {
49
    const AVClass *class;
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    uint8_t *fontfile;              ///< font to be used
51
    uint8_t *text;                  ///< text to be drawn
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    uint8_t *expanded_text;         ///< used to contain the strftime()-expanded text
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    size_t   expanded_text_size;    ///< size in bytes of the expanded_text buffer
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    int ft_load_flags;              ///< flags used for loading fonts, see FT_LOAD_*
55
    FT_Vector *positions;           ///< positions for each element in the text
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    size_t nb_positions;            ///< number of elements of positions array
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    char *textfile;                 ///< file with text to be drawn
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    unsigned int x;                 ///< x position to start drawing text
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    unsigned int y;                 ///< y position to start drawing text
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    int shadowx, shadowy;
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    unsigned int fontsize;          ///< font size to use
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    char *fontcolor_string;         ///< font color as string
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    char *boxcolor_string;          ///< box color as string
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    char *shadowcolor_string;       ///< shadow color as string
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    uint8_t fontcolor[4];           ///< foreground color
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    uint8_t boxcolor[4];            ///< background color
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    uint8_t shadowcolor[4];         ///< shadow color
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    uint8_t fontcolor_rgba[4];      ///< foreground color in RGBA
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    uint8_t boxcolor_rgba[4];       ///< background color in RGBA
70
    uint8_t shadowcolor_rgba[4];    ///< shadow color in RGBA
71

    
72
    short int draw_box;             ///< draw box around text - true or false
73
    int use_kerning;                ///< font kerning is used - true/false
74
    int tabsize;                    ///< tab size
75

    
76
    FT_Library library;             ///< freetype font library handle
77
    FT_Face face;                   ///< freetype font face handle
78
    struct AVTreeNode *glyphs;      ///< rendered glyphs, stored using the UTF-32 char code
79
    int hsub, vsub;                 ///< chroma subsampling values
80
    int is_packed_rgb;
81
    int pixel_step[4];              ///< distance in bytes between the component of each pixel
82
    uint8_t rgba_map[4];            ///< map RGBA offsets to the positions in the packed RGBA format
83
    uint8_t *box_line[4];           ///< line used for filling the box background
84
} DrawTextContext;
85

    
86
#define OFFSET(x) offsetof(DrawTextContext, x)
87

    
88
static const AVOption drawtext_options[]= {
89
{"fontfile", "set font file",        OFFSET(fontfile),           FF_OPT_TYPE_STRING, {.str=NULL},  CHAR_MIN, CHAR_MAX },
90
{"text",     "set text",             OFFSET(text),               FF_OPT_TYPE_STRING, {.str=NULL},  CHAR_MIN, CHAR_MAX },
91
{"textfile", "set text file",        OFFSET(textfile),           FF_OPT_TYPE_STRING, {.str=NULL},  CHAR_MIN, CHAR_MAX },
92
{"fontcolor","set foreground color", OFFSET(fontcolor_string),   FF_OPT_TYPE_STRING, {.str=NULL},  CHAR_MIN, CHAR_MAX },
93
{"boxcolor", "set box color",        OFFSET(boxcolor_string),    FF_OPT_TYPE_STRING, {.str=NULL},  CHAR_MIN, CHAR_MAX },
94
{"shadowcolor", "set shadow color",  OFFSET(shadowcolor_string), FF_OPT_TYPE_STRING, {.str=NULL},  CHAR_MIN, CHAR_MAX },
95
{"box",      "set box",              OFFSET(draw_box),           FF_OPT_TYPE_INT,    {.dbl=0},     0,        1        },
96
{"fontsize", "set font size",        OFFSET(fontsize),           FF_OPT_TYPE_INT,    {.dbl=16},    1,        72       },
97
{"x",        "set x",                OFFSET(x),                  FF_OPT_TYPE_INT,    {.dbl=0},     0,        INT_MAX  },
98
{"y",        "set y",                OFFSET(y),                  FF_OPT_TYPE_INT,    {.dbl=0},     0,        INT_MAX  },
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{"shadowx",  "set x",                OFFSET(shadowx),            FF_OPT_TYPE_INT,    {.dbl=0},     INT_MIN,  INT_MAX  },
100
{"shadowy",  "set y",                OFFSET(shadowy),            FF_OPT_TYPE_INT,    {.dbl=0},     INT_MIN,  INT_MAX  },
101
{"tabsize",  "set tab size",         OFFSET(tabsize),            FF_OPT_TYPE_INT,    {.dbl=4},     0,        INT_MAX  },
102

    
103
/* FT_LOAD_* flags */
104
{"ft_load_flags", "set font loading flags for libfreetype",   OFFSET(ft_load_flags),  FF_OPT_TYPE_FLAGS,  {.dbl=FT_LOAD_DEFAULT|FT_LOAD_RENDER}, 0, INT_MAX, 0, "ft_load_flags" },
105
{"default",                     "set default",                     0, FF_OPT_TYPE_CONST, {.dbl=FT_LOAD_DEFAULT},                     INT_MIN, INT_MAX, 0, "ft_load_flags" },
106
{"no_scale",                    "set no_scale",                    0, FF_OPT_TYPE_CONST, {.dbl=FT_LOAD_NO_SCALE},                    INT_MIN, INT_MAX, 0, "ft_load_flags" },
107
{"no_hinting",                  "set no_hinting",                  0, FF_OPT_TYPE_CONST, {.dbl=FT_LOAD_NO_HINTING},                  INT_MIN, INT_MAX, 0, "ft_load_flags" },
108
{"render",                      "set render",                      0, FF_OPT_TYPE_CONST, {.dbl=FT_LOAD_RENDER},                      INT_MIN, INT_MAX, 0, "ft_load_flags" },
109
{"no_bitmap",                   "set no_bitmap",                   0, FF_OPT_TYPE_CONST, {.dbl=FT_LOAD_NO_BITMAP},                   INT_MIN, INT_MAX, 0, "ft_load_flags" },
110
{"vertical_layout",             "set vertical_layout",             0, FF_OPT_TYPE_CONST, {.dbl=FT_LOAD_VERTICAL_LAYOUT},             INT_MIN, INT_MAX, 0, "ft_load_flags" },
111
{"force_autohint",              "set force_autohint",              0, FF_OPT_TYPE_CONST, {.dbl=FT_LOAD_FORCE_AUTOHINT},              INT_MIN, INT_MAX, 0, "ft_load_flags" },
112
{"crop_bitmap",                 "set crop_bitmap",                 0, FF_OPT_TYPE_CONST, {.dbl=FT_LOAD_CROP_BITMAP},                 INT_MIN, INT_MAX, 0, "ft_load_flags" },
113
{"pedantic",                    "set pedantic",                    0, FF_OPT_TYPE_CONST, {.dbl=FT_LOAD_PEDANTIC},                    INT_MIN, INT_MAX, 0, "ft_load_flags" },
114
{"ignore_global_advance_width", "set ignore_global_advance_width", 0, FF_OPT_TYPE_CONST, {.dbl=FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
115
{"no_recurse",                  "set no_recurse",                  0, FF_OPT_TYPE_CONST, {.dbl=FT_LOAD_NO_RECURSE},                  INT_MIN, INT_MAX, 0, "ft_load_flags" },
116
{"ignore_transform",            "set ignore_transform",            0, FF_OPT_TYPE_CONST, {.dbl=FT_LOAD_IGNORE_TRANSFORM},            INT_MIN, INT_MAX, 0, "ft_load_flags" },
117
{"monochrome",                  "set monochrome",                  0, FF_OPT_TYPE_CONST, {.dbl=FT_LOAD_MONOCHROME},                  INT_MIN, INT_MAX, 0, "ft_load_flags" },
118
{"linear_design",               "set linear_design",               0, FF_OPT_TYPE_CONST, {.dbl=FT_LOAD_LINEAR_DESIGN},               INT_MIN, INT_MAX, 0, "ft_load_flags" },
119
{"no_autohint",                 "set no_autohint",                 0, FF_OPT_TYPE_CONST, {.dbl=FT_LOAD_NO_AUTOHINT},                 INT_MIN, INT_MAX, 0, "ft_load_flags" },
120
{NULL},
121
};
122

    
123
static const char *drawtext_get_name(void *ctx)
124
{
125
    return "drawtext";
126
}
127

    
128
static const AVClass drawtext_class = {
129
    "DrawTextContext",
130
    drawtext_get_name,
131
    drawtext_options
132
};
133

    
134
#undef __FTERRORS_H__
135
#define FT_ERROR_START_LIST {
136
#define FT_ERRORDEF(e, v, s) { (e), (s) },
137
#define FT_ERROR_END_LIST { 0, NULL } };
138

    
139
struct ft_error
140
{
141
    int err;
142
    const char *err_msg;
143
} static ft_errors[] =
144
#include FT_ERRORS_H
145

    
146
#define FT_ERRMSG(e) ft_errors[e].err_msg
147

    
148
typedef struct {
149
    FT_Glyph *glyph;
150
    uint32_t code;
151
    FT_Bitmap bitmap; ///< array holding bitmaps of font
152
    FT_BBox bbox;
153
    int advance;
154
    int bitmap_left;
155
    int bitmap_top;
156
} Glyph;
157

    
158
static int glyph_cmp(void *key, const void *b)
159
{
160
    const Glyph *a = key, *bb = b;
161
    int64_t diff = (int64_t)a->code - (int64_t)bb->code;
162
    return diff > 0 ? 1 : diff < 0 ? -1 : 0;
163
}
164

    
165
/**
166
 * Load glyphs corresponding to the UTF-32 codepoint code.
167
 */
168
static int load_glyph(AVFilterContext *ctx, Glyph **glyph_ptr, uint32_t code)
169
{
170
    DrawTextContext *dtext = ctx->priv;
171
    Glyph *glyph;
172
    struct AVTreeNode *node = NULL;
173
    int ret;
174

    
175
    /* load glyph into dtext->face->glyph */
176
    if (FT_Load_Char(dtext->face, code, dtext->ft_load_flags))
177
        return AVERROR(EINVAL);
178

    
179
    /* save glyph */
180
    if (!(glyph = av_mallocz(sizeof(*glyph))) ||
181
        !(glyph->glyph = av_mallocz(sizeof(*glyph->glyph)))) {
182
        ret = AVERROR(ENOMEM);
183
        goto error;
184
    }
185
    glyph->code  = code;
186

    
187
    if (FT_Get_Glyph(dtext->face->glyph, glyph->glyph)) {
188
        ret = AVERROR(EINVAL);
189
        goto error;
190
    }
191

    
192
    glyph->bitmap      = dtext->face->glyph->bitmap;
193
    glyph->bitmap_left = dtext->face->glyph->bitmap_left;
194
    glyph->bitmap_top  = dtext->face->glyph->bitmap_top;
195
    glyph->advance     = dtext->face->glyph->advance.x >> 6;
196

    
197
    /* measure text height to calculate text_height (or the maximum text height) */
198
    FT_Glyph_Get_CBox(*glyph->glyph, ft_glyph_bbox_pixels, &glyph->bbox);
199

    
200
    /* cache the newly created glyph */
201
    if (!(node = av_mallocz(av_tree_node_size))) {
202
        ret = AVERROR(ENOMEM);
203
        goto error;
204
    }
205
    av_tree_insert(&dtext->glyphs, glyph, glyph_cmp, &node);
206

    
207
    if (glyph_ptr)
208
        *glyph_ptr = glyph;
209
    return 0;
210

    
211
error:
212
    if (glyph)
213
        av_freep(&glyph->glyph);
214
    av_freep(&glyph);
215
    av_freep(&node);
216
    return ret;
217
}
218

    
219
static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
220
{
221
    int err;
222
    DrawTextContext *dtext = ctx->priv;
223
    Glyph *glyph;
224

    
225
    dtext->class = &drawtext_class;
226
    av_opt_set_defaults2(dtext, 0, 0);
227
    dtext->fontcolor_string = av_strdup("black");
228
    dtext->boxcolor_string = av_strdup("white");
229
    dtext->shadowcolor_string = av_strdup("black");
230

    
231
    if ((err = (av_set_options_string(dtext, args, "=", ":"))) < 0) {
232
        av_log(ctx, AV_LOG_ERROR, "Error parsing options string: '%s'\n", args);
233
        return err;
234
    }
235

    
236
    if (!dtext->fontfile) {
237
        av_log(ctx, AV_LOG_ERROR, "No font filename provided\n");
238
        return AVERROR(EINVAL);
239
    }
240

    
241
    if (dtext->textfile) {
242
        uint8_t *textbuf;
243
        size_t textbuf_size;
244

    
245
        if (dtext->text) {
246
            av_log(ctx, AV_LOG_ERROR,
247
                   "Both text and text file provided. Please provide only one\n");
248
            return AVERROR(EINVAL);
249
        }
250
        if ((err = av_file_map(dtext->textfile, &textbuf, &textbuf_size, 0, ctx)) < 0) {
251
            av_log(ctx, AV_LOG_ERROR,
252
                   "The text file '%s' could not be read or is empty\n",
253
                   dtext->textfile);
254
            return err;
255
        }
256

    
257
        if (!(dtext->text = av_malloc(textbuf_size+1)))
258
            return AVERROR(ENOMEM);
259
        memcpy(dtext->text, textbuf, textbuf_size);
260
        dtext->text[textbuf_size] = 0;
261
        av_file_unmap(textbuf, textbuf_size);
262
    }
263

    
264
    if (!dtext->text) {
265
        av_log(ctx, AV_LOG_ERROR,
266
               "Either text or a valid file must be provided\n");
267
        return AVERROR(EINVAL);
268
    }
269

    
270
    if ((err = av_parse_color(dtext->fontcolor_rgba, dtext->fontcolor_string, -1, ctx))) {
271
        av_log(ctx, AV_LOG_ERROR,
272
               "Invalid font color '%s'\n", dtext->fontcolor_string);
273
        return err;
274
    }
275

    
276
    if ((err = av_parse_color(dtext->boxcolor_rgba, dtext->boxcolor_string, -1, ctx))) {
277
        av_log(ctx, AV_LOG_ERROR,
278
               "Invalid box color '%s'\n", dtext->boxcolor_string);
279
        return err;
280
    }
281

    
282
    if ((err = av_parse_color(dtext->shadowcolor_rgba, dtext->shadowcolor_string, -1, ctx))) {
283
        av_log(ctx, AV_LOG_ERROR,
284
               "Invalid shadow color '%s'\n", dtext->shadowcolor_string);
285
        return err;
286
    }
287

    
288
    if ((err = FT_Init_FreeType(&(dtext->library)))) {
289
        av_log(ctx, AV_LOG_ERROR,
290
               "Could not load FreeType: %s\n", FT_ERRMSG(err));
291
        return AVERROR(EINVAL);
292
    }
293

    
294
    /* load the face, and set up the encoding, which is by default UTF-8 */
295
    if ((err = FT_New_Face(dtext->library, dtext->fontfile, 0, &dtext->face))) {
296
        av_log(ctx, AV_LOG_ERROR, "Could not load fontface from file '%s': %s\n",
297
               dtext->fontfile, FT_ERRMSG(err));
298
        return AVERROR(EINVAL);
299
    }
300
    if ((err = FT_Set_Pixel_Sizes(dtext->face, 0, dtext->fontsize))) {
301
        av_log(ctx, AV_LOG_ERROR, "Could not set font size to %d pixels: %s\n",
302
               dtext->fontsize, FT_ERRMSG(err));
303
        return AVERROR(EINVAL);
304
    }
305

    
306
    dtext->use_kerning = FT_HAS_KERNING(dtext->face);
307

    
308
    /* load the fallback glyph with code 0 */
309
    load_glyph(ctx, NULL, 0);
310

    
311
    /* set the tabsize in pixels */
312
    if ((err = load_glyph(ctx, &glyph, ' ') < 0)) {
313
        av_log(ctx, AV_LOG_ERROR, "Could not set tabsize.\n");
314
        return err;
315
    }
316
    dtext->tabsize *= glyph->advance;
317

    
318
#if !HAVE_LOCALTIME_R
319
    av_log(ctx, AV_LOG_WARNING, "strftime() expansion unavailable!\n");
320
#endif
321

    
322
    return 0;
323
}
324

    
325
static int query_formats(AVFilterContext *ctx)
326
{
327
    static const enum PixelFormat pix_fmts[] = {
328
        PIX_FMT_ARGB,    PIX_FMT_RGBA,
329
        PIX_FMT_ABGR,    PIX_FMT_BGRA,
330
        PIX_FMT_RGB24,   PIX_FMT_BGR24,
331
        PIX_FMT_YUV420P, PIX_FMT_YUV444P,
332
        PIX_FMT_YUV422P, PIX_FMT_YUV411P,
333
        PIX_FMT_YUV410P, PIX_FMT_YUV440P,
334
        PIX_FMT_NONE
335
    };
336

    
337
    avfilter_set_common_formats(ctx, avfilter_make_format_list(pix_fmts));
338
    return 0;
339
}
340

    
341
static int glyph_enu_free(void *opaque, void *elem)
342
{
343
    av_free(elem);
344
    return 0;
345
}
346

    
347
static av_cold void uninit(AVFilterContext *ctx)
348
{
349
    DrawTextContext *dtext = ctx->priv;
350
    int i;
351

    
352
    av_freep(&dtext->fontfile);
353
    av_freep(&dtext->text);
354
    av_freep(&dtext->expanded_text);
355
    av_freep(&dtext->fontcolor_string);
356
    av_freep(&dtext->boxcolor_string);
357
    av_freep(&dtext->positions);
358
    av_freep(&dtext->shadowcolor_string);
359
    av_tree_enumerate(dtext->glyphs, NULL, NULL, glyph_enu_free);
360
    av_tree_destroy(dtext->glyphs);
361
    dtext->glyphs = 0;
362
    FT_Done_Face(dtext->face);
363
    FT_Done_FreeType(dtext->library);
364

    
365
    for (i = 0; i < 4; i++) {
366
        av_freep(&dtext->box_line[i]);
367
        dtext->pixel_step[i] = 0;
368
    }
369

    
370
}
371

    
372
static int config_input(AVFilterLink *inlink)
373
{
374
    DrawTextContext *dtext = inlink->dst->priv;
375
    const AVPixFmtDescriptor *pix_desc = &av_pix_fmt_descriptors[inlink->format];
376
    int ret;
377

    
378
    dtext->hsub = pix_desc->log2_chroma_w;
379
    dtext->vsub = pix_desc->log2_chroma_h;
380

    
381
    if ((ret =
382
         ff_fill_line_with_color(dtext->box_line, dtext->pixel_step,
383
                                 inlink->w, dtext->boxcolor,
384
                                 inlink->format, dtext->boxcolor_rgba,
385
                                 &dtext->is_packed_rgb, dtext->rgba_map)) < 0)
386
        return ret;
387

    
388
    if (!dtext->is_packed_rgb) {
389
        uint8_t *rgba = dtext->fontcolor_rgba;
390
        dtext->fontcolor[0] = RGB_TO_Y_CCIR(rgba[0], rgba[1], rgba[2]);
391
        dtext->fontcolor[1] = RGB_TO_U_CCIR(rgba[0], rgba[1], rgba[2], 0);
392
        dtext->fontcolor[2] = RGB_TO_V_CCIR(rgba[0], rgba[1], rgba[2], 0);
393
        dtext->fontcolor[3] = rgba[3];
394
        rgba = dtext->shadowcolor_rgba;
395
        dtext->shadowcolor[0] = RGB_TO_Y_CCIR(rgba[0], rgba[1], rgba[2]);
396
        dtext->shadowcolor[1] = RGB_TO_U_CCIR(rgba[0], rgba[1], rgba[2], 0);
397
        dtext->shadowcolor[2] = RGB_TO_V_CCIR(rgba[0], rgba[1], rgba[2], 0);
398
        dtext->shadowcolor[3] = rgba[3];
399
    }
400

    
401
    return 0;
402
}
403

    
404
#define GET_BITMAP_VAL(r, c)                                            \
405
    bitmap->pixel_mode == FT_PIXEL_MODE_MONO ?                          \
406
        (bitmap->buffer[(r) * bitmap->pitch + ((c)>>3)] & (0x80 >> ((c)&7))) * 255 : \
407
         bitmap->buffer[(r) * bitmap->pitch +  (c)]
408

    
409
#define SET_PIXEL_YUV(picref, yuva_color, val, x, y, hsub, vsub) {           \
410
    luma_pos    = ((x)          ) + ((y)          ) * picref->linesize[0]; \
411
    alpha = yuva_color[3] * (val) * 129;                               \
412
    picref->data[0][luma_pos]    = (alpha * yuva_color[0] + (255*255*129 - alpha) * picref->data[0][luma_pos]   ) >> 23; \
413
    if (((x) & ((1<<(hsub)) - 1)) == 0 && ((y) & ((1<<(vsub)) - 1)) == 0) {\
414
        chroma_pos1 = ((x) >> (hsub)) + ((y) >> (vsub)) * picref->linesize[1]; \
415
        chroma_pos2 = ((x) >> (hsub)) + ((y) >> (vsub)) * picref->linesize[2]; \
416
        picref->data[1][chroma_pos1] = (alpha * yuva_color[1] + (255*255*129 - alpha) * picref->data[1][chroma_pos1]) >> 23; \
417
        picref->data[2][chroma_pos2] = (alpha * yuva_color[2] + (255*255*129 - alpha) * picref->data[2][chroma_pos2]) >> 23; \
418
    }\
419
}
420

    
421
static inline int draw_glyph_yuv(AVFilterBufferRef *picref, FT_Bitmap *bitmap, unsigned int x,
422
                                 unsigned int y, unsigned int width, unsigned int height,
423
                                 const uint8_t yuva_color[4], int hsub, int vsub)
424
{
425
    int r, c, alpha;
426
    unsigned int luma_pos, chroma_pos1, chroma_pos2;
427
    uint8_t src_val, dst_pixel[4];
428

    
429
    for (r = 0; r < bitmap->rows && r+y < height; r++) {
430
        for (c = 0; c < bitmap->width && c+x < width; c++) {
431
            /* get pixel in the picref (destination) */
432
            dst_pixel[0] = picref->data[0][  c+x           +  (y+r)          * picref->linesize[0]];
433
            dst_pixel[1] = picref->data[1][((c+x) >> hsub) + ((y+r) >> vsub) * picref->linesize[1]];
434
            dst_pixel[2] = picref->data[2][((c+x) >> hsub) + ((y+r) >> vsub) * picref->linesize[2]];
435

    
436
            /* get intensity value in the glyph bitmap (source) */
437
            src_val = GET_BITMAP_VAL(r, c);
438
            if (!src_val)
439
                continue;
440

    
441
            SET_PIXEL_YUV(picref, yuva_color, src_val, c+x, y+r, hsub, vsub);
442
        }
443
    }
444

    
445
    return 0;
446
}
447

    
448
#define SET_PIXEL_RGB(picref, rgba_color, val, x, y, pixel_step, r_off, g_off, b_off, a_off) { \
449
    p   = picref->data[0] + (x) * pixel_step + ((y) * picref->linesize[0]); \
450
    alpha = rgba_color[3] * (val) * 129;                              \
451
    *(p+r_off) = (alpha * rgba_color[0] + (255*255*129 - alpha) * *(p+r_off)) >> 23; \
452
    *(p+g_off) = (alpha * rgba_color[1] + (255*255*129 - alpha) * *(p+g_off)) >> 23; \
453
    *(p+b_off) = (alpha * rgba_color[2] + (255*255*129 - alpha) * *(p+b_off)) >> 23; \
454
}
455

    
456
static inline int draw_glyph_rgb(AVFilterBufferRef *picref, FT_Bitmap *bitmap,
457
                                 unsigned int x, unsigned int y,
458
                                 unsigned int width, unsigned int height, int pixel_step,
459
                                 const uint8_t rgba_color[4], const uint8_t rgba_map[4])
460
{
461
    int r, c, alpha;
462
    uint8_t *p;
463
    uint8_t src_val, dst_pixel[4];
464

    
465
    for (r = 0; r < bitmap->rows && r+y < height; r++) {
466
        for (c = 0; c < bitmap->width && c+x < width; c++) {
467
            /* get pixel in the picref (destination) */
468
            dst_pixel[0] = picref->data[0][(c+x + rgba_map[0]) * pixel_step +
469
                                           (y+r) * picref->linesize[0]];
470
            dst_pixel[1] = picref->data[0][(c+x + rgba_map[1]) * pixel_step +
471
                                           (y+r) * picref->linesize[0]];
472
            dst_pixel[2] = picref->data[0][(c+x + rgba_map[2]) * pixel_step +
473
                                           (y+r) * picref->linesize[0]];
474

    
475
            /* get intensity value in the glyph bitmap (source) */
476
            src_val = GET_BITMAP_VAL(r, c);
477
            if (!src_val)
478
                continue;
479

    
480
            SET_PIXEL_RGB(picref, rgba_color, src_val, c+x, y+r, pixel_step,
481
                          rgba_map[0], rgba_map[1], rgba_map[2], rgba_map[3]);
482
        }
483
    }
484

    
485
    return 0;
486
}
487

    
488
static inline void drawbox(AVFilterBufferRef *picref, unsigned int x, unsigned int y,
489
                           unsigned int width, unsigned int height,
490
                           uint8_t *line[4], int pixel_step[4], uint8_t color[4],
491
                           int hsub, int vsub, int is_rgba_packed, uint8_t rgba_map[4])
492
{
493
    int i, j, alpha;
494

    
495
    if (color[3] != 0xFF) {
496
        if (is_rgba_packed) {
497
            uint8_t *p;
498
            for (j = 0; j < height; j++)
499
                for (i = 0; i < width; i++)
500
                    SET_PIXEL_RGB(picref, color, 255, i+x, y+j, pixel_step[0],
501
                                  rgba_map[0], rgba_map[1], rgba_map[2], rgba_map[3]);
502
        } else {
503
            unsigned int luma_pos, chroma_pos1, chroma_pos2;
504
            for (j = 0; j < height; j++)
505
                for (i = 0; i < width; i++)
506
                    SET_PIXEL_YUV(picref, color, 255, i+x, y+j, hsub, vsub);
507
        }
508
    } else {
509
        ff_draw_rectangle(picref->data, picref->linesize,
510
                          line, pixel_step, hsub, vsub,
511
                          x, y, width, height);
512
    }
513
}
514

    
515
static inline int is_newline(uint32_t c)
516
{
517
    return (c == '\n' || c == '\r' || c == '\f' || c == '\v');
518
}
519

    
520
static int draw_glyphs(DrawTextContext *dtext, AVFilterBufferRef *picref,
521
                       int width, int height, const uint8_t rgbcolor[4], const uint8_t yuvcolor[4], int x, int y)
522
{
523
    char *text = HAVE_LOCALTIME_R ? dtext->expanded_text : dtext->text;
524
    uint32_t code = 0;
525
    int i;
526
    uint8_t *p;
527
    Glyph *glyph = NULL;
528

    
529
    for (i = 0, p = text; *p; i++) {
530
        Glyph dummy = { 0 };
531
        GET_UTF8(code, *p++, continue;);
532

    
533
        /* skip new line chars, just go to new line */
534
        if (code == '\n' || code == '\r' || code == '\t')
535
            continue;
536

    
537
        dummy.code = code;
538
        glyph = av_tree_find(dtext->glyphs, &dummy, (void *)glyph_cmp, NULL);
539

    
540
        if (glyph->bitmap.pixel_mode != FT_PIXEL_MODE_MONO &&
541
            glyph->bitmap.pixel_mode != FT_PIXEL_MODE_GRAY)
542
            return AVERROR(EINVAL);
543

    
544
        if (dtext->is_packed_rgb) {
545
            draw_glyph_rgb(picref, &glyph->bitmap,
546
                           dtext->positions[i].x+x, dtext->positions[i].y+y, width, height,
547
                           dtext->pixel_step[0], rgbcolor, dtext->rgba_map);
548
        } else {
549
            draw_glyph_yuv(picref, &glyph->bitmap,
550
                           dtext->positions[i].x+x, dtext->positions[i].y+y, width, height,
551
                           yuvcolor, dtext->hsub, dtext->vsub);
552
        }
553
    }
554

    
555
    return 0;
556
}
557

    
558
static int draw_text(AVFilterContext *ctx, AVFilterBufferRef *picref,
559
                     int width, int height)
560
{
561
    DrawTextContext *dtext = ctx->priv;
562
    uint32_t code = 0, prev_code = 0;
563
    int x = 0, y = 0, i = 0, ret;
564
    int text_height, baseline;
565
    char *text = dtext->text;
566
    uint8_t *p;
567
    int str_w = 0, len;
568
    int y_min = 32000, y_max = -32000;
569
    FT_Vector delta;
570
    Glyph *glyph = NULL, *prev_glyph = NULL;
571
    Glyph dummy = { 0 };
572

    
573
#if HAVE_LOCALTIME_R
574
    time_t now = time(0);
575
    struct tm ltime;
576
    uint8_t *buf = dtext->expanded_text;
577
    int buf_size = dtext->expanded_text_size;
578

    
579
    if (!buf) {
580
        buf_size = 2*strlen(dtext->text)+1;
581
        buf = av_malloc(buf_size);
582
    }
583

    
584
    localtime_r(&now, &ltime);
585

    
586
    do {
587
        *buf = 1;
588
        if (strftime(buf, buf_size, dtext->text, &ltime) != 0 || *buf == 0)
589
            break;
590
        buf_size *= 2;
591
    } while ((buf = av_realloc(buf, buf_size)));
592

    
593
    if (!buf)
594
        return AVERROR(ENOMEM);
595
    text = dtext->expanded_text = buf;
596
    dtext->expanded_text_size = buf_size;
597
#endif
598
    if ((len = strlen(text)) > dtext->nb_positions) {
599
        if (!(dtext->positions =
600
              av_realloc(dtext->positions, len*sizeof(*dtext->positions))))
601
            return AVERROR(ENOMEM);
602
        dtext->nb_positions = len;
603
    }
604

    
605
    x = dtext->x;
606
    y = dtext->y;
607

    
608
    /* load and cache glyphs */
609
    for (i = 0, p = text; *p; i++) {
610
        GET_UTF8(code, *p++, continue;);
611

    
612
        /* get glyph */
613
        dummy.code = code;
614
        glyph = av_tree_find(dtext->glyphs, &dummy, glyph_cmp, NULL);
615
        if (!glyph)
616
            load_glyph(ctx, &glyph, code);
617

    
618
        y_min = FFMIN(glyph->bbox.yMin, y_min);
619
        y_max = FFMAX(glyph->bbox.yMax, y_max);
620
    }
621
    text_height = y_max - y_min;
622
    baseline    = y_max;
623

    
624
    /* compute and save position for each glyph */
625
    glyph = NULL;
626
    for (i = 0, p = text; *p; i++) {
627
        GET_UTF8(code, *p++, continue;);
628

    
629
        /* skip the \n in the sequence \r\n */
630
        if (prev_code == '\r' && code == '\n')
631
            continue;
632

    
633
        prev_code = code;
634
        if (is_newline(code)) {
635
            str_w = FFMAX(str_w, x - dtext->x);
636
            y += text_height;
637
            x = dtext->x;
638
            continue;
639
        }
640

    
641
        /* get glyph */
642
        prev_glyph = glyph;
643
        dummy.code = code;
644
        glyph = av_tree_find(dtext->glyphs, &dummy, glyph_cmp, NULL);
645

    
646
        /* kerning */
647
        if (dtext->use_kerning && prev_glyph && glyph->code) {
648
            FT_Get_Kerning(dtext->face, prev_glyph->code, glyph->code,
649
                           ft_kerning_default, &delta);
650
            x += delta.x >> 6;
651
        }
652

    
653
        if (x + glyph->bbox.xMax >= width) {
654
            str_w = FFMAX(str_w, x - dtext->x);
655
            y += text_height;
656
            x = dtext->x;
657
        }
658

    
659
        /* save position */
660
        dtext->positions[i].x = x + glyph->bitmap_left;
661
        dtext->positions[i].y = y - glyph->bitmap_top + baseline;
662
        if (code == '\t') x  = (x / dtext->tabsize + 1)*dtext->tabsize;
663
        else              x += glyph->advance;
664
    }
665

    
666
    str_w = FFMIN(width - dtext->x - 1, FFMAX(str_w, x - dtext->x));
667
    y     = FFMIN(y + text_height, height - 1);
668

    
669
    /* draw box */
670
    if (dtext->draw_box)
671
        drawbox(picref, dtext->x, dtext->y, str_w, y-dtext->y,
672
                dtext->box_line, dtext->pixel_step, dtext->boxcolor,
673
                dtext->hsub, dtext->vsub, dtext->is_packed_rgb, dtext->rgba_map);
674

    
675
    if (dtext->shadowx || dtext->shadowy) {
676
        if ((ret = draw_glyphs(dtext, picref, width, height, dtext->shadowcolor_rgba,
677
                               dtext->shadowcolor, dtext->shadowx, dtext->shadowy)) < 0)
678
            return ret;
679
    }
680

    
681
    if ((ret = draw_glyphs(dtext, picref, width, height, dtext->fontcolor_rgba,
682
                           dtext->fontcolor, 0, 0)) < 0)
683
        return ret;
684

    
685
    return 0;
686
}
687

    
688
static void null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir) { }
689

    
690
static void end_frame(AVFilterLink *inlink)
691
{
692
    AVFilterLink *outlink = inlink->dst->outputs[0];
693
    AVFilterBufferRef *picref = inlink->cur_buf;
694

    
695
    draw_text(inlink->dst, picref, picref->video->w, picref->video->h);
696

    
697
    avfilter_draw_slice(outlink, 0, picref->video->h, 1);
698
    avfilter_end_frame(outlink);
699
}
700

    
701
AVFilter avfilter_vf_drawtext = {
702
    .name          = "drawtext",
703
    .description   = NULL_IF_CONFIG_SMALL("Draw text on top of video frames using libfreetype library."),
704
    .priv_size     = sizeof(DrawTextContext),
705
    .init          = init,
706
    .uninit        = uninit,
707
    .query_formats = query_formats,
708

    
709
    .inputs    = (AVFilterPad[]) {{ .name             = "default",
710
                                    .type             = AVMEDIA_TYPE_VIDEO,
711
                                    .get_video_buffer = avfilter_null_get_video_buffer,
712
                                    .start_frame      = avfilter_null_start_frame,
713
                                    .draw_slice       = null_draw_slice,
714
                                    .end_frame        = end_frame,
715
                                    .config_props     = config_input,
716
                                    .min_perms        = AV_PERM_WRITE |
717
                                                        AV_PERM_READ,
718
                                    .rej_perms        = AV_PERM_PRESERVE },
719
                                  { .name = NULL}},
720
    .outputs   = (AVFilterPad[]) {{ .name             = "default",
721
                                    .type             = AVMEDIA_TYPE_VIDEO, },
722
                                  { .name = NULL}},
723
};