Statistics
| Branch: | Revision:

ffmpeg / libavfilter / vf_drawtext.c @ c5420f10

History | View | Annotate | Download (27.7 KB)

1
/*
2
 * Copyright (c) 2011 Stefano Sabatini
3
 * Copyright (c) 2010 S.N. Hemanth Meenakshisundaram
4
 * Copyright (c) 2003 Gustavo Sverzut Barbieri <gsbarbieri@yahoo.com.br>
5
 *
6
 * 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
10
 * License as published by the Free Software Foundation; either
11
 * 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,
14
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16
 * Lesser General Public License for more details.
17
 *
18
 * You should have received a copy of the GNU Lesser General Public
19
 * License along with FFmpeg; if not, write to the Free Software
20
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21
 */
22

    
23
/**
24
 * @file
25
 * drawtext filter, based on the original FFmpeg vhook/drawtext.c
26
 * 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"
35
#include "libavutil/parseutils.h"
36
#include "libavutil/pixdesc.h"
37
#include "libavutil/tree.h"
38
#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;
50
    uint8_t *fontfile;              ///< font to be used
51
    uint8_t *text;                  ///< text to be drawn
52
    uint8_t *text_priv;             ///< used to detect whether text changed
53
    int ft_load_flags;              ///< flags used for loading fonts, see FT_LOAD_*
54
    FT_Vector *positions;           ///< positions for each element in the text
55
    char *textfile;                 ///< file with text to be drawn
56
    unsigned int x;                 ///< x position to start drawing text
57
    unsigned int y;                 ///< y position to start drawing text
58
    int shadowx, shadowy;
59
    unsigned int fontsize;          ///< font size to use
60
    char *fontcolor_string;         ///< font color as string
61
    char *boxcolor_string;          ///< box color as string
62
    char *shadowcolor_string;       ///< shadow color as string
63
    uint8_t fontcolor[4];           ///< foreground color
64
    uint8_t boxcolor[4];            ///< background color
65
    uint8_t shadowcolor[4];         ///< shadow color
66
    uint8_t fontcolor_rgba[4];      ///< foreground color in RGBA
67
    uint8_t boxcolor_rgba[4];       ///< background color in RGBA
68
    uint8_t shadowcolor_rgba[4];    ///< shadow color in RGBA
69

    
70
    short int draw_box;             ///< draw box around text - true or false
71
    int use_kerning;                ///< font kerning is used - true/false
72
    int tabsize;                    ///< tab size
73

    
74
    FT_Library library;             ///< freetype font library handle
75
    FT_Face face;                   ///< freetype font face handle
76
    struct AVTreeNode *glyphs;      ///< rendered glyphs, stored using the UTF-32 char code
77
    int hsub, vsub;                 ///< chroma subsampling values
78
    int is_packed_rgb;
79
    int pixel_step[4];              ///< distance in bytes between the component of each pixel
80
    uint8_t rgba_map[4];            ///< map RGBA offsets to the positions in the packed RGBA format
81
    uint8_t *box_line[4];           ///< line used for filling the box background
82
} DrawTextContext;
83

    
84
#define OFFSET(x) offsetof(DrawTextContext, x)
85

    
86
static const AVOption drawtext_options[]= {
87
{"fontfile", "set font file",        OFFSET(fontfile),         FF_OPT_TYPE_STRING, 0,  CHAR_MIN, CHAR_MAX },
88
{"text",     "set text",             OFFSET(text),             FF_OPT_TYPE_STRING, 0,  CHAR_MIN, CHAR_MAX },
89
{"textfile", "set text file",        OFFSET(textfile),         FF_OPT_TYPE_STRING, 0,  CHAR_MIN, CHAR_MAX },
90
{"fontcolor","set foreground color", OFFSET(fontcolor_string), FF_OPT_TYPE_STRING, 0,  CHAR_MIN, CHAR_MAX },
91
{"boxcolor", "set box color",        OFFSET(boxcolor_string),  FF_OPT_TYPE_STRING, 0,  CHAR_MIN, CHAR_MAX },
92
{"shadowcolor", "set shadow color",  OFFSET(shadowcolor_string),  FF_OPT_TYPE_STRING, 0,  CHAR_MIN, CHAR_MAX },
93
{"box",      "set box",              OFFSET(draw_box),         FF_OPT_TYPE_INT,    0,         0,        1 },
94
{"fontsize", "set font size",        OFFSET(fontsize),         FF_OPT_TYPE_INT,   16,         1,       72 },
95
{"x",        "set x",                OFFSET(x),                FF_OPT_TYPE_INT,    0,         0,  INT_MAX },
96
{"y",        "set y",                OFFSET(y),                FF_OPT_TYPE_INT,    0,         0,  INT_MAX },
97
{"shadowx",  "set x",                OFFSET(shadowx),          FF_OPT_TYPE_INT,    0,   INT_MIN,  INT_MAX },
98
{"shadowy",  "set y",                OFFSET(shadowy),          FF_OPT_TYPE_INT,    0,   INT_MIN,  INT_MAX },
99
{"tabsize",  "set tab size",         OFFSET(tabsize),          FF_OPT_TYPE_INT,    4,         0,  INT_MAX },
100

    
101
/* FT_LOAD_* flags */
102
{"ft_load_flags", "set font loading flags for libfreetype",   OFFSET(ft_load_flags),  FF_OPT_TYPE_FLAGS,  FT_LOAD_DEFAULT|FT_LOAD_RENDER, 0, INT_MAX, 0, "ft_load_flags" },
103
{"default",                     "set default",                     0, FF_OPT_TYPE_CONST, FT_LOAD_DEFAULT,                     INT_MIN, INT_MAX, 0, "ft_load_flags" },
104
{"no_scale",                    "set no_scale",                    0, FF_OPT_TYPE_CONST, FT_LOAD_NO_SCALE,                    INT_MIN, INT_MAX, 0, "ft_load_flags" },
105
{"no_hinting",                  "set no_hinting",                  0, FF_OPT_TYPE_CONST, FT_LOAD_NO_HINTING,                  INT_MIN, INT_MAX, 0, "ft_load_flags" },
106
{"render",                      "set render",                      0, FF_OPT_TYPE_CONST, FT_LOAD_RENDER,                      INT_MIN, INT_MAX, 0, "ft_load_flags" },
107
{"no_bitmap",                   "set no_bitmap",                   0, FF_OPT_TYPE_CONST, FT_LOAD_NO_BITMAP,                   INT_MIN, INT_MAX, 0, "ft_load_flags" },
108
{"vertical_layout",             "set vertical_layout",             0, FF_OPT_TYPE_CONST, FT_LOAD_VERTICAL_LAYOUT,             INT_MIN, INT_MAX, 0, "ft_load_flags" },
109
{"force_autohint",              "set force_autohint",              0, FF_OPT_TYPE_CONST, FT_LOAD_FORCE_AUTOHINT,              INT_MIN, INT_MAX, 0, "ft_load_flags" },
110
{"crop_bitmap",                 "set crop_bitmap",                 0, FF_OPT_TYPE_CONST, FT_LOAD_CROP_BITMAP,                 INT_MIN, INT_MAX, 0, "ft_load_flags" },
111
{"pedantic",                    "set pedantic",                    0, FF_OPT_TYPE_CONST, FT_LOAD_PEDANTIC,                    INT_MIN, INT_MAX, 0, "ft_load_flags" },
112
{"ignore_global_advance_width", "set ignore_global_advance_width", 0, FF_OPT_TYPE_CONST, FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH, INT_MIN, INT_MAX, 0, "ft_load_flags" },
113
{"no_recurse",                  "set no_recurse",                  0, FF_OPT_TYPE_CONST, FT_LOAD_NO_RECURSE,                  INT_MIN, INT_MAX, 0, "ft_load_flags" },
114
{"ignore_transform",            "set ignore_transform",            0, FF_OPT_TYPE_CONST, FT_LOAD_IGNORE_TRANSFORM,            INT_MIN, INT_MAX, 0, "ft_load_flags" },
115
{"monochrome",                  "set monochrome",                  0, FF_OPT_TYPE_CONST, FT_LOAD_MONOCHROME,                  INT_MIN, INT_MAX, 0, "ft_load_flags" },
116
{"linear_design",               "set linear_design",               0, FF_OPT_TYPE_CONST, FT_LOAD_LINEAR_DESIGN,               INT_MIN, INT_MAX, 0, "ft_load_flags" },
117
{"no_autohint",                 "set no_autohint",                 0, FF_OPT_TYPE_CONST, FT_LOAD_NO_AUTOHINT,                 INT_MIN, INT_MAX, 0, "ft_load_flags" },
118
{NULL},
119
};
120

    
121
static const char *drawtext_get_name(void *ctx)
122
{
123
    return "drawtext";
124
}
125

    
126
static const AVClass drawtext_class = {
127
    "DrawTextContext",
128
    drawtext_get_name,
129
    drawtext_options
130
};
131

    
132
#undef __FTERRORS_H__
133
#define FT_ERROR_START_LIST {
134
#define FT_ERRORDEF(e, v, s) { (e), (s) },
135
#define FT_ERROR_END_LIST { 0, NULL } };
136

    
137
struct ft_error
138
{
139
    int err;
140
    const char *err_msg;
141
} static ft_errors[] =
142
#include FT_ERRORS_H
143

    
144
#define FT_ERRMSG(e) ft_errors[e].err_msg
145

    
146
typedef struct {
147
    FT_Glyph *glyph;
148
    uint32_t code;
149
    FT_Bitmap bitmap; ///< array holding bitmaps of font
150
    FT_BBox bbox;
151
    int advance;
152
    int bitmap_left;
153
    int bitmap_top;
154
} Glyph;
155

    
156
static int glyph_cmp(void *key, const void *b)
157
{
158
    const Glyph *a = key, *bb = b;
159
    int64_t diff = (int64_t)a->code - (int64_t)bb->code;
160
    return diff > 0 ? 1 : diff < 0 ? -1 : 0;
161
}
162

    
163
/**
164
 * Load glyphs corresponding to the UTF-32 codepoint code.
165
 */
166
static int load_glyph(AVFilterContext *ctx, Glyph **glyph_ptr, uint32_t code)
167
{
168
    DrawTextContext *dtext = ctx->priv;
169
    Glyph *glyph;
170
    struct AVTreeNode *node = NULL;
171
    int ret;
172

    
173
    /* load glyph into dtext->face->glyph */
174
    if (FT_Load_Char(dtext->face, code, dtext->ft_load_flags))
175
        return AVERROR(EINVAL);
176

    
177
    /* save glyph */
178
    if (!(glyph = av_mallocz(sizeof(*glyph))) ||
179
        !(glyph->glyph = av_mallocz(sizeof(*glyph->glyph)))) {
180
        ret = AVERROR(ENOMEM);
181
        goto error;
182
    }
183
    glyph->code  = code;
184

    
185
    if (FT_Get_Glyph(dtext->face->glyph, glyph->glyph)) {
186
        ret = AVERROR(EINVAL);
187
        goto error;
188
    }
189

    
190
    glyph->bitmap      = dtext->face->glyph->bitmap;
191
    glyph->bitmap_left = dtext->face->glyph->bitmap_left;
192
    glyph->bitmap_top  = dtext->face->glyph->bitmap_top;
193
    glyph->advance     = dtext->face->glyph->advance.x >> 6;
194

    
195
    /* measure text height to calculate text_height (or the maximum text height) */
196
    FT_Glyph_Get_CBox(*glyph->glyph, ft_glyph_bbox_pixels, &glyph->bbox);
197

    
198
    /* cache the newly created glyph */
199
    if (!(node = av_mallocz(av_tree_node_size))) {
200
        ret = AVERROR(ENOMEM);
201
        goto error;
202
    }
203
    av_tree_insert(&dtext->glyphs, glyph, glyph_cmp, &node);
204

    
205
    if (glyph_ptr)
206
        *glyph_ptr = glyph;
207
    return 0;
208

    
209
error:
210
    if (glyph)
211
        av_freep(&glyph->glyph);
212
    av_freep(&glyph);
213
    av_freep(&node);
214
    return ret;
215
}
216

    
217
static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
218
{
219
    int err;
220
    DrawTextContext *dtext = ctx->priv;
221
    Glyph *glyph;
222

    
223
    dtext->class = &drawtext_class;
224
    av_opt_set_defaults2(dtext, 0, 0);
225
    dtext->fontcolor_string = av_strdup("black");
226
    dtext->boxcolor_string = av_strdup("white");
227
    dtext->shadowcolor_string = av_strdup("black");
228

    
229
    if ((err = (av_set_options_string(dtext, args, "=", ":"))) < 0) {
230
        av_log(ctx, AV_LOG_ERROR, "Error parsing options string: '%s'\n", args);
231
        return err;
232
    }
233

    
234
    if (!dtext->fontfile) {
235
        av_log(ctx, AV_LOG_ERROR, "No font filename provided\n");
236
        return AVERROR(EINVAL);
237
    }
238

    
239
    if (dtext->textfile) {
240
        uint8_t *textbuf;
241
        size_t textbuf_size;
242

    
243
        if (dtext->text) {
244
            av_log(ctx, AV_LOG_ERROR,
245
                   "Both text and text file provided. Please provide only one\n");
246
            return AVERROR(EINVAL);
247
        }
248
        if ((err = av_file_map(dtext->textfile, &textbuf, &textbuf_size, 0, ctx)) < 0) {
249
            av_log(ctx, AV_LOG_ERROR,
250
                   "The text file '%s' could not be read or is empty\n",
251
                   dtext->textfile);
252
            return err;
253
        }
254

    
255
        if (!(dtext->text = av_malloc(textbuf_size+1)))
256
            return AVERROR(ENOMEM);
257
        memcpy(dtext->text, textbuf, textbuf_size);
258
        dtext->text[textbuf_size] = 0;
259
        av_file_unmap(textbuf, textbuf_size);
260
    }
261

    
262
    if (!dtext->text) {
263
        av_log(ctx, AV_LOG_ERROR,
264
               "Either text or a valid file must be provided\n");
265
        return AVERROR(EINVAL);
266
    }
267

    
268
    if ((err = av_parse_color(dtext->fontcolor_rgba, dtext->fontcolor_string, -1, ctx))) {
269
        av_log(ctx, AV_LOG_ERROR,
270
               "Invalid font color '%s'\n", dtext->fontcolor_string);
271
        return err;
272
    }
273

    
274
    if ((err = av_parse_color(dtext->boxcolor_rgba, dtext->boxcolor_string, -1, ctx))) {
275
        av_log(ctx, AV_LOG_ERROR,
276
               "Invalid box color '%s'\n", dtext->boxcolor_string);
277
        return err;
278
    }
279

    
280
    if ((err = av_parse_color(dtext->shadowcolor_rgba, dtext->shadowcolor_string, -1, ctx))) {
281
        av_log(ctx, AV_LOG_ERROR,
282
               "Invalid shadow color '%s'\n", dtext->shadowcolor_string);
283
        return err;
284
    }
285

    
286
    if ((err = FT_Init_FreeType(&(dtext->library)))) {
287
        av_log(ctx, AV_LOG_ERROR,
288
               "Could not load FreeType: %s\n", FT_ERRMSG(err));
289
        return AVERROR(EINVAL);
290
    }
291

    
292
    /* load the face, and set up the encoding, which is by default UTF-8 */
293
    if ((err = FT_New_Face(dtext->library, dtext->fontfile, 0, &dtext->face))) {
294
        av_log(ctx, AV_LOG_ERROR, "Could not load fontface from file '%s': %s\n",
295
               dtext->fontfile, FT_ERRMSG(err));
296
        return AVERROR(EINVAL);
297
    }
298
    if ((err = FT_Set_Pixel_Sizes(dtext->face, 0, dtext->fontsize))) {
299
        av_log(ctx, AV_LOG_ERROR, "Could not set font size to %d pixels: %s\n",
300
               dtext->fontsize, FT_ERRMSG(err));
301
        return AVERROR(EINVAL);
302
    }
303

    
304
    dtext->use_kerning = FT_HAS_KERNING(dtext->face);
305

    
306
    /* load the fallback glyph with code 0 */
307
    load_glyph(ctx, NULL, 0);
308

    
309
    /* set the tabsize in pixels */
310
    if ((err = load_glyph(ctx, &glyph, ' ') < 0)) {
311
        av_log(ctx, AV_LOG_ERROR, "Could not set tabsize.\n");
312
        return err;
313
    }
314
    dtext->tabsize *= glyph->advance;
315

    
316
#if !HAVE_LOCALTIME_R
317
    av_log(ctx, AV_LOG_WARNING, "strftime() expansion unavailable!\n");
318
#endif
319

    
320
    return 0;
321
}
322

    
323
static int query_formats(AVFilterContext *ctx)
324
{
325
    static const enum PixelFormat pix_fmts[] = {
326
        PIX_FMT_ARGB,    PIX_FMT_RGBA,
327
        PIX_FMT_ABGR,    PIX_FMT_BGRA,
328
        PIX_FMT_RGB24,   PIX_FMT_BGR24,
329
        PIX_FMT_YUV420P, PIX_FMT_YUV444P,
330
        PIX_FMT_YUV422P, PIX_FMT_YUV411P,
331
        PIX_FMT_YUV410P, PIX_FMT_YUV440P,
332
        PIX_FMT_NONE
333
    };
334

    
335
    avfilter_set_common_formats(ctx, avfilter_make_format_list(pix_fmts));
336
    return 0;
337
}
338

    
339
static int glyph_enu_free(void *opaque, void *elem)
340
{
341
    av_free(elem);
342
    return 0;
343
}
344

    
345
static av_cold void uninit(AVFilterContext *ctx)
346
{
347
    DrawTextContext *dtext = ctx->priv;
348
    int i;
349

    
350
    av_freep(&dtext->fontfile);
351
    av_freep(&dtext->text);
352
    av_freep(&dtext->fontcolor_string);
353
    av_freep(&dtext->boxcolor_string);
354
    av_freep(&dtext->positions);
355
    av_freep(&dtext->shadowcolor_string);
356
    av_tree_enumerate(dtext->glyphs, NULL, NULL, glyph_enu_free);
357
    av_tree_destroy(dtext->glyphs);
358
    dtext->glyphs = 0;
359
    FT_Done_Face(dtext->face);
360
    FT_Done_FreeType(dtext->library);
361

    
362
    for (i = 0; i < 4; i++) {
363
        av_freep(&dtext->box_line[i]);
364
        dtext->pixel_step[i] = 0;
365
    }
366

    
367
}
368

    
369
static int config_input(AVFilterLink *inlink)
370
{
371
    DrawTextContext *dtext = inlink->dst->priv;
372
    const AVPixFmtDescriptor *pix_desc = &av_pix_fmt_descriptors[inlink->format];
373
    int ret;
374

    
375
    dtext->hsub = pix_desc->log2_chroma_w;
376
    dtext->vsub = pix_desc->log2_chroma_h;
377

    
378
    if ((ret =
379
         ff_fill_line_with_color(dtext->box_line, dtext->pixel_step,
380
                                 inlink->w, dtext->boxcolor,
381
                                 inlink->format, dtext->boxcolor_rgba,
382
                                 &dtext->is_packed_rgb, dtext->rgba_map)) < 0)
383
        return ret;
384

    
385
    if (!dtext->is_packed_rgb) {
386
        uint8_t *rgba = dtext->fontcolor_rgba;
387
        dtext->fontcolor[0] = RGB_TO_Y_CCIR(rgba[0], rgba[1], rgba[2]);
388
        dtext->fontcolor[1] = RGB_TO_U_CCIR(rgba[0], rgba[1], rgba[2], 0);
389
        dtext->fontcolor[2] = RGB_TO_V_CCIR(rgba[0], rgba[1], rgba[2], 0);
390
        dtext->fontcolor[3] = rgba[3];
391
        rgba = dtext->shadowcolor_rgba;
392
        dtext->shadowcolor[0] = RGB_TO_Y_CCIR(rgba[0], rgba[1], rgba[2]);
393
        dtext->shadowcolor[1] = RGB_TO_U_CCIR(rgba[0], rgba[1], rgba[2], 0);
394
        dtext->shadowcolor[2] = RGB_TO_V_CCIR(rgba[0], rgba[1], rgba[2], 0);
395
        dtext->shadowcolor[3] = rgba[3];
396
    }
397

    
398
    return 0;
399
}
400

    
401
#define GET_BITMAP_VAL(r, c)                                            \
402
    bitmap->pixel_mode == FT_PIXEL_MODE_MONO ?                          \
403
        (bitmap->buffer[(r) * bitmap->pitch + ((c)>>3)] & (0x80 >> ((c)&7))) * 255 : \
404
         bitmap->buffer[(r) * bitmap->pitch +  (c)]
405

    
406
#define SET_PIXEL_YUV(picref, yuva_color, val, x, y, hsub, vsub) {           \
407
    luma_pos    = ((x)          ) + ((y)          ) * picref->linesize[0]; \
408
    alpha = yuva_color[3] * (val) * 129;                               \
409
    picref->data[0][luma_pos]    = (alpha * yuva_color[0] + (255*255*129 - alpha) * picref->data[0][luma_pos]   ) >> 23; \
410
    if (((x) & ((1<<(hsub)) - 1)) == 0 && ((y) & ((1<<(vsub)) - 1)) == 0) {\
411
        chroma_pos1 = ((x) >> (hsub)) + ((y) >> (vsub)) * picref->linesize[1]; \
412
        chroma_pos2 = ((x) >> (hsub)) + ((y) >> (vsub)) * picref->linesize[2]; \
413
        picref->data[1][chroma_pos1] = (alpha * yuva_color[1] + (255*255*129 - alpha) * picref->data[1][chroma_pos1]) >> 23; \
414
        picref->data[2][chroma_pos2] = (alpha * yuva_color[2] + (255*255*129 - alpha) * picref->data[2][chroma_pos2]) >> 23; \
415
    }\
416
}
417

    
418
static inline int draw_glyph_yuv(AVFilterBufferRef *picref, FT_Bitmap *bitmap, unsigned int x,
419
                                 unsigned int y, unsigned int width, unsigned int height,
420
                                 const uint8_t yuva_color[4], int hsub, int vsub)
421
{
422
    int r, c, alpha;
423
    unsigned int luma_pos, chroma_pos1, chroma_pos2;
424
    uint8_t src_val, dst_pixel[4];
425

    
426
    for (r = 0; r < bitmap->rows && r+y < height; r++) {
427
        for (c = 0; c < bitmap->width && c+x < width; c++) {
428
            /* get pixel in the picref (destination) */
429
            dst_pixel[0] = picref->data[0][  c+x           +  (y+r)          * picref->linesize[0]];
430
            dst_pixel[1] = picref->data[1][((c+x) >> hsub) + ((y+r) >> vsub) * picref->linesize[1]];
431
            dst_pixel[2] = picref->data[2][((c+x) >> hsub) + ((y+r) >> vsub) * picref->linesize[2]];
432

    
433
            /* get intensity value in the glyph bitmap (source) */
434
            src_val = GET_BITMAP_VAL(r, c);
435
            if (!src_val)
436
                continue;
437

    
438
            SET_PIXEL_YUV(picref, yuva_color, src_val, c+x, y+r, hsub, vsub);
439
        }
440
    }
441

    
442
    return 0;
443
}
444

    
445
#define SET_PIXEL_RGB(picref, rgba_color, val, x, y, pixel_step, r_off, g_off, b_off, a_off) { \
446
    p   = picref->data[0] + (x) * pixel_step + ((y) * picref->linesize[0]); \
447
    alpha = rgba_color[3] * (val) * 129;                              \
448
    *(p+r_off) = (alpha * rgba_color[0] + (255*255*129 - alpha) * *(p+r_off)) >> 23; \
449
    *(p+g_off) = (alpha * rgba_color[1] + (255*255*129 - alpha) * *(p+g_off)) >> 23; \
450
    *(p+b_off) = (alpha * rgba_color[2] + (255*255*129 - alpha) * *(p+b_off)) >> 23; \
451
}
452

    
453
static inline int draw_glyph_rgb(AVFilterBufferRef *picref, FT_Bitmap *bitmap,
454
                                 unsigned int x, unsigned int y,
455
                                 unsigned int width, unsigned int height, int pixel_step,
456
                                 const uint8_t rgba_color[4], const uint8_t rgba_map[4])
457
{
458
    int r, c, alpha;
459
    uint8_t *p;
460
    uint8_t src_val, dst_pixel[4];
461

    
462
    for (r = 0; r < bitmap->rows && r+y < height; r++) {
463
        for (c = 0; c < bitmap->width && c+x < width; c++) {
464
            /* get pixel in the picref (destination) */
465
            dst_pixel[0] = picref->data[0][(c+x + rgba_map[0]) * pixel_step +
466
                                           (y+r) * picref->linesize[0]];
467
            dst_pixel[1] = picref->data[0][(c+x + rgba_map[1]) * pixel_step +
468
                                           (y+r) * picref->linesize[0]];
469
            dst_pixel[2] = picref->data[0][(c+x + rgba_map[2]) * pixel_step +
470
                                           (y+r) * picref->linesize[0]];
471

    
472
            /* get intensity value in the glyph bitmap (source) */
473
            src_val = GET_BITMAP_VAL(r, c);
474
            if (!src_val)
475
                continue;
476

    
477
            SET_PIXEL_RGB(picref, rgba_color, src_val, c+x, y+r, pixel_step,
478
                          rgba_map[0], rgba_map[1], rgba_map[2], rgba_map[3]);
479
        }
480
    }
481

    
482
    return 0;
483
}
484

    
485
static inline void drawbox(AVFilterBufferRef *picref, unsigned int x, unsigned int y,
486
                           unsigned int width, unsigned int height,
487
                           uint8_t *line[4], int pixel_step[4], uint8_t color[4],
488
                           int hsub, int vsub, int is_rgba_packed, uint8_t rgba_map[4])
489
{
490
    int i, j, alpha;
491

    
492
    if (color[3] != 0xFF) {
493
        if (is_rgba_packed) {
494
            uint8_t *p;
495
            for (j = 0; j < height; j++)
496
                for (i = 0; i < width; i++)
497
                    SET_PIXEL_RGB(picref, color, 255, i+x, y+j, pixel_step[0],
498
                                  rgba_map[0], rgba_map[1], rgba_map[2], rgba_map[3]);
499
        } else {
500
            unsigned int luma_pos, chroma_pos1, chroma_pos2;
501
            for (j = 0; j < height; j++)
502
                for (i = 0; i < width; i++)
503
                    SET_PIXEL_YUV(picref, color, 255, i+x, y+j, hsub, vsub);
504
        }
505
    } else {
506
        ff_draw_rectangle(picref->data, picref->linesize,
507
                          line, pixel_step, hsub, vsub,
508
                          x, y, width, height);
509
    }
510
}
511

    
512
static inline int is_newline(uint32_t c)
513
{
514
    return (c == '\n' || c == '\r' || c == '\f' || c == '\v');
515
}
516

    
517
static int draw_glyphs(DrawTextContext *dtext, AVFilterBufferRef *picref,
518
                       int width, int height, const uint8_t rgbcolor[4], const uint8_t yuvcolor[4], int x, int y)
519
{
520
    char *text = dtext->text;
521
    uint32_t code = 0;
522
    int i;
523
    uint8_t *p;
524
    Glyph *glyph = NULL;
525

    
526
    for (i = 0, p = text; *p; i++) {
527
        Glyph dummy = { 0 };
528
        GET_UTF8(code, *p++, continue;);
529

    
530
        /* skip new line chars, just go to new line */
531
        if (code == '\n' || code == '\r' || code == '\t')
532
            continue;
533

    
534
        dummy.code = code;
535
        glyph = av_tree_find(dtext->glyphs, &dummy, (void *)glyph_cmp, NULL);
536

    
537
        if (glyph->bitmap.pixel_mode != FT_PIXEL_MODE_MONO &&
538
            glyph->bitmap.pixel_mode != FT_PIXEL_MODE_GRAY)
539
            return AVERROR(EINVAL);
540

    
541
        if (dtext->is_packed_rgb) {
542
            draw_glyph_rgb(picref, &glyph->bitmap,
543
                           dtext->positions[i].x+x, dtext->positions[i].y+y, width, height,
544
                           dtext->pixel_step[0], rgbcolor, dtext->rgba_map);
545
        } else {
546
            draw_glyph_yuv(picref, &glyph->bitmap,
547
                           dtext->positions[i].x+x, dtext->positions[i].y+y, width, height,
548
                           yuvcolor, dtext->hsub, dtext->vsub);
549
        }
550
    }
551

    
552
    return 0;
553
}
554

    
555
static int draw_text(AVFilterContext *ctx, AVFilterBufferRef *picref,
556
                     int width, int height)
557
{
558
    DrawTextContext *dtext = ctx->priv;
559
    uint32_t code = 0, prev_code = 0;
560
    int x = 0, y = 0, i = 0, ret;
561
    int text_height, baseline;
562
    uint8_t *p;
563
    int str_w = 0;
564
    int y_min = 32000, y_max = -32000;
565
    FT_Vector delta;
566
    Glyph *glyph = NULL, *prev_glyph = NULL;
567
    Glyph dummy = { 0 };
568

    
569
    if (dtext->text != dtext->text_priv) {
570
#if HAVE_LOCALTIME_R
571
        time_t now = time(0);
572
        struct tm ltime;
573
        uint8_t *buf = NULL;
574
        int     buflen = 2*strlen(dtext->text) + 1, len;
575

    
576
        localtime_r(&now, &ltime);
577

    
578
        while ((buf = av_realloc(buf, buflen))) {
579
            *buf = 1;
580
            if ((len = strftime(buf, buflen, dtext->text, &ltime)) != 0 || *buf == 0)
581
                break;
582
            buflen *= 2;
583
        }
584
        if (!buf)
585
            return AVERROR(ENOMEM);
586
        av_freep(&dtext->text);
587
        dtext->text = dtext->text_priv = buf;
588
#else
589
        dtext->text_priv = dtext->text;
590
#endif
591
        if (!(dtext->positions = av_realloc(dtext->positions,
592
                                            strlen(dtext->text)*sizeof(*dtext->positions))))
593
            return AVERROR(ENOMEM);
594
    }
595

    
596
    x = dtext->x;
597
    y = dtext->y;
598

    
599
    /* load and cache glyphs */
600
    for (i = 0, p = dtext->text; *p; i++) {
601
        GET_UTF8(code, *p++, continue;);
602

    
603
        /* get glyph */
604
        dummy.code = code;
605
        glyph = av_tree_find(dtext->glyphs, &dummy, glyph_cmp, NULL);
606
        if (!glyph)
607
            load_glyph(ctx, &glyph, code);
608

    
609
        y_min = FFMIN(glyph->bbox.yMin, y_min);
610
        y_max = FFMAX(glyph->bbox.yMax, y_max);
611
    }
612
    text_height = y_max - y_min;
613
    baseline    = y_max;
614

    
615
    /* compute and save position for each glyph */
616
    glyph = NULL;
617
    for (i = 0, p = dtext->text; *p; i++) {
618
        GET_UTF8(code, *p++, continue;);
619

    
620
        /* skip the \n in the sequence \r\n */
621
        if (prev_code == '\r' && code == '\n')
622
            continue;
623

    
624
        prev_code = code;
625
        if (is_newline(code)) {
626
            str_w = FFMAX(str_w, x - dtext->x);
627
            y += text_height;
628
            x = dtext->x;
629
            continue;
630
        }
631

    
632
        /* get glyph */
633
        prev_glyph = glyph;
634
        dummy.code = code;
635
        glyph = av_tree_find(dtext->glyphs, &dummy, glyph_cmp, NULL);
636

    
637
        /* kerning */
638
        if (dtext->use_kerning && prev_glyph && glyph->code) {
639
            FT_Get_Kerning(dtext->face, prev_glyph->code, glyph->code,
640
                           ft_kerning_default, &delta);
641
            x += delta.x >> 6;
642
        }
643

    
644
        if (x + glyph->bbox.xMax >= width) {
645
            str_w = FFMAX(str_w, x - dtext->x);
646
            y += text_height;
647
            x = dtext->x;
648
        }
649

    
650
        /* save position */
651
        dtext->positions[i].x = x + glyph->bitmap_left;
652
        dtext->positions[i].y = y - glyph->bitmap_top + baseline;
653
        if (code == '\t') x  = (x / dtext->tabsize + 1)*dtext->tabsize;
654
        else              x += glyph->advance;
655
    }
656

    
657
    str_w = FFMIN(width - dtext->x - 1, FFMAX(str_w, x - dtext->x));
658
    y     = FFMIN(y + text_height, height - 1);
659

    
660
    /* draw box */
661
    if (dtext->draw_box)
662
        drawbox(picref, dtext->x, dtext->y, str_w, y-dtext->y,
663
                dtext->box_line, dtext->pixel_step, dtext->boxcolor,
664
                dtext->hsub, dtext->vsub, dtext->is_packed_rgb, dtext->rgba_map);
665

    
666
    if (dtext->shadowx || dtext->shadowy) {
667
        if ((ret = draw_glyphs(dtext, picref, width, height, dtext->shadowcolor_rgba,
668
                               dtext->shadowcolor, dtext->shadowx, dtext->shadowy)) < 0)
669
            return ret;
670
    }
671

    
672
    if ((ret = draw_glyphs(dtext, picref, width, height, dtext->fontcolor_rgba,
673
                           dtext->fontcolor, 0, 0)) < 0)
674
        return ret;
675

    
676
    return 0;
677
}
678

    
679
static void null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir) { }
680

    
681
static void end_frame(AVFilterLink *inlink)
682
{
683
    AVFilterLink *outlink = inlink->dst->outputs[0];
684
    AVFilterBufferRef *picref = inlink->cur_buf;
685

    
686
    draw_text(inlink->dst, picref, picref->video->w, picref->video->h);
687

    
688
    avfilter_draw_slice(outlink, 0, picref->video->h, 1);
689
    avfilter_end_frame(outlink);
690
}
691

    
692
AVFilter avfilter_vf_drawtext = {
693
    .name          = "drawtext",
694
    .description   = NULL_IF_CONFIG_SMALL("Draw text on top of video frames using libfreetype library."),
695
    .priv_size     = sizeof(DrawTextContext),
696
    .init          = init,
697
    .uninit        = uninit,
698
    .query_formats = query_formats,
699

    
700
    .inputs    = (AVFilterPad[]) {{ .name             = "default",
701
                                    .type             = AVMEDIA_TYPE_VIDEO,
702
                                    .get_video_buffer = avfilter_null_get_video_buffer,
703
                                    .start_frame      = avfilter_null_start_frame,
704
                                    .draw_slice       = null_draw_slice,
705
                                    .end_frame        = end_frame,
706
                                    .config_props     = config_input,
707
                                    .min_perms        = AV_PERM_WRITE |
708
                                                        AV_PERM_READ,
709
                                    .rej_perms        = AV_PERM_PRESERVE },
710
                                  { .name = NULL}},
711
    .outputs   = (AVFilterPad[]) {{ .name             = "default",
712
                                    .type             = AVMEDIA_TYPE_VIDEO, },
713
                                  { .name = NULL}},
714
};