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ffmpeg / libavfilter / vf_drawtext.c @ e74bf3f3

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1
/*
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 * 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
11
 * version 2.1 of the License, or (at your option) any later version.
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 *
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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 *
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 * 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"
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
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    int ft_load_flags;              ///< flags used for loading fonts, see FT_LOAD_*
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    FT_Vector *positions;           ///< positions for each element in the text
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    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
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    unsigned int fontsize;          ///< font size to use
59
    char *fontcolor_string;         ///< font color as string
60
    char *boxcolor_string;          ///< box color as string
61
    uint8_t fontcolor[4];           ///< foreground color
62
    uint8_t boxcolor[4];            ///< background 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
65

    
66
    short int draw_box;             ///< draw box around text - true or false
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    int use_kerning;                ///< font kerning is used - true/false
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    int tabsize;                    ///< tab size
69

    
70
    FT_Library library;             ///< freetype font library handle
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    FT_Face face;                   ///< freetype font face handle
72
    struct AVTreeNode *glyphs;      ///< rendered glyphs, stored using the UTF-32 char code
73
    int hsub, vsub;                 ///< chroma subsampling values
74
    int is_packed_rgb;
75
    int pixel_step[4];              ///< distance in bytes between the component of each pixel
76
    uint8_t rgba_map[4];            ///< map RGBA offsets to the positions in the packed RGBA format
77
    uint8_t *box_line[4];           ///< line used for filling the box background
78
} DrawTextContext;
79

    
80
#define OFFSET(x) offsetof(DrawTextContext, x)
81

    
82
static const AVOption drawtext_options[]= {
83
{"fontfile", "set font file",        OFFSET(fontfile),         FF_OPT_TYPE_STRING, 0,  CHAR_MIN, CHAR_MAX },
84
{"text",     "set text",             OFFSET(text),             FF_OPT_TYPE_STRING, 0,  CHAR_MIN, CHAR_MAX },
85
{"textfile", "set text file",        OFFSET(textfile),         FF_OPT_TYPE_STRING, 0,  CHAR_MIN, CHAR_MAX },
86
{"fontcolor","set foreground color", OFFSET(fontcolor_string), FF_OPT_TYPE_STRING, 0,  CHAR_MIN, CHAR_MAX },
87
{"boxcolor", "set box color",        OFFSET(boxcolor_string),  FF_OPT_TYPE_STRING, 0,  CHAR_MIN, CHAR_MAX },
88
{"box",      "set box",              OFFSET(draw_box),         FF_OPT_TYPE_INT,    0,         0,        1 },
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{"fontsize", "set font size",        OFFSET(fontsize),         FF_OPT_TYPE_INT,   16,         1,       72 },
90
{"x",        "set x",                OFFSET(x),                FF_OPT_TYPE_INT,    0,         0,  INT_MAX },
91
{"y",        "set y",                OFFSET(y),                FF_OPT_TYPE_INT,    0,         0,  INT_MAX },
92
{"tabsize",  "set tab size",         OFFSET(tabsize),          FF_OPT_TYPE_INT,    4,         0,  INT_MAX },
93

    
94
/* FT_LOAD_* flags */
95
{"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" },
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{"default",                     "set default",                     0, FF_OPT_TYPE_CONST, FT_LOAD_DEFAULT,                     INT_MIN, INT_MAX, 0, "ft_load_flags" },
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{"no_scale",                    "set no_scale",                    0, FF_OPT_TYPE_CONST, FT_LOAD_NO_SCALE,                    INT_MIN, INT_MAX, 0, "ft_load_flags" },
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{"no_hinting",                  "set no_hinting",                  0, FF_OPT_TYPE_CONST, FT_LOAD_NO_HINTING,                  INT_MIN, INT_MAX, 0, "ft_load_flags" },
99
{"render",                      "set render",                      0, FF_OPT_TYPE_CONST, FT_LOAD_RENDER,                      INT_MIN, INT_MAX, 0, "ft_load_flags" },
100
{"no_bitmap",                   "set no_bitmap",                   0, FF_OPT_TYPE_CONST, FT_LOAD_NO_BITMAP,                   INT_MIN, INT_MAX, 0, "ft_load_flags" },
101
{"vertical_layout",             "set vertical_layout",             0, FF_OPT_TYPE_CONST, FT_LOAD_VERTICAL_LAYOUT,             INT_MIN, INT_MAX, 0, "ft_load_flags" },
102
{"force_autohint",              "set force_autohint",              0, FF_OPT_TYPE_CONST, FT_LOAD_FORCE_AUTOHINT,              INT_MIN, INT_MAX, 0, "ft_load_flags" },
103
{"crop_bitmap",                 "set crop_bitmap",                 0, FF_OPT_TYPE_CONST, FT_LOAD_CROP_BITMAP,                 INT_MIN, INT_MAX, 0, "ft_load_flags" },
104
{"pedantic",                    "set pedantic",                    0, FF_OPT_TYPE_CONST, FT_LOAD_PEDANTIC,                    INT_MIN, INT_MAX, 0, "ft_load_flags" },
105
{"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" },
106
{"no_recurse",                  "set no_recurse",                  0, FF_OPT_TYPE_CONST, FT_LOAD_NO_RECURSE,                  INT_MIN, INT_MAX, 0, "ft_load_flags" },
107
{"ignore_transform",            "set ignore_transform",            0, FF_OPT_TYPE_CONST, FT_LOAD_IGNORE_TRANSFORM,            INT_MIN, INT_MAX, 0, "ft_load_flags" },
108
{"monochrome",                  "set monochrome",                  0, FF_OPT_TYPE_CONST, FT_LOAD_MONOCHROME,                  INT_MIN, INT_MAX, 0, "ft_load_flags" },
109
{"linear_design",               "set linear_design",               0, FF_OPT_TYPE_CONST, FT_LOAD_LINEAR_DESIGN,               INT_MIN, INT_MAX, 0, "ft_load_flags" },
110
{"no_autohint",                 "set no_autohint",                 0, FF_OPT_TYPE_CONST, FT_LOAD_NO_AUTOHINT,                 INT_MIN, INT_MAX, 0, "ft_load_flags" },
111
{NULL},
112
};
113

    
114
static const char *drawtext_get_name(void *ctx)
115
{
116
    return "drawtext";
117
}
118

    
119
static const AVClass drawtext_class = {
120
    "DrawTextContext",
121
    drawtext_get_name,
122
    drawtext_options
123
};
124

    
125
#undef __FTERRORS_H__
126
#define FT_ERROR_START_LIST {
127
#define FT_ERRORDEF(e, v, s) { (e), (s) },
128
#define FT_ERROR_END_LIST { 0, NULL } };
129

    
130
struct ft_error
131
{
132
    int err;
133
    const char *err_msg;
134
} static ft_errors[] =
135
#include FT_ERRORS_H
136

    
137
#define FT_ERRMSG(e) ft_errors[e].err_msg
138

    
139
typedef struct {
140
    FT_Glyph *glyph;
141
    uint32_t code;
142
    FT_Bitmap bitmap; ///< array holding bitmaps of font
143
    FT_BBox bbox;
144
    int advance;
145
    int bitmap_left;
146
    int bitmap_top;
147
} Glyph;
148

    
149
static int glyph_cmp(void *key, const void *b)
150
{
151
    const Glyph *a = key, *bb = b;
152
    int64_t diff = (int64_t)a->code - (int64_t)bb->code;
153
    return diff > 0 ? 1 : diff < 0 ? -1 : 0;
154
}
155

    
156
/**
157
 * Load glyphs corresponding to the UTF-32 codepoint code.
158
 */
159
static int load_glyph(AVFilterContext *ctx, Glyph **glyph_ptr, uint32_t code)
160
{
161
    DrawTextContext *dtext = ctx->priv;
162
    Glyph *glyph;
163
    struct AVTreeNode *node = NULL;
164
    int ret;
165

    
166
    /* load glyph into dtext->face->glyph */
167
    if (FT_Load_Char(dtext->face, code, dtext->ft_load_flags))
168
        return AVERROR(EINVAL);
169

    
170
    /* save glyph */
171
    if (!(glyph = av_mallocz(sizeof(*glyph))) ||
172
        !(glyph->glyph = av_mallocz(sizeof(*glyph->glyph)))) {
173
        ret = AVERROR(ENOMEM);
174
        goto error;
175
    }
176
    glyph->code  = code;
177

    
178
    if (FT_Get_Glyph(dtext->face->glyph, glyph->glyph)) {
179
        ret = AVERROR(EINVAL);
180
        goto error;
181
    }
182

    
183
    glyph->bitmap      = dtext->face->glyph->bitmap;
184
    glyph->bitmap_left = dtext->face->glyph->bitmap_left;
185
    glyph->bitmap_top  = dtext->face->glyph->bitmap_top;
186
    glyph->advance     = dtext->face->glyph->advance.x >> 6;
187

    
188
    /* measure text height to calculate text_height (or the maximum text height) */
189
    FT_Glyph_Get_CBox(*glyph->glyph, ft_glyph_bbox_pixels, &glyph->bbox);
190

    
191
    /* cache the newly created glyph */
192
    if (!(node = av_mallocz(av_tree_node_size))) {
193
        ret = AVERROR(ENOMEM);
194
        goto error;
195
    }
196
    av_tree_insert(&dtext->glyphs, glyph, glyph_cmp, &node);
197

    
198
    if (glyph_ptr)
199
        *glyph_ptr = glyph;
200
    return 0;
201

    
202
error:
203
    if (glyph)
204
        av_freep(&glyph->glyph);
205
    av_freep(&glyph);
206
    av_freep(&node);
207
    return ret;
208
}
209

    
210
static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
211
{
212
    int err;
213
    DrawTextContext *dtext = ctx->priv;
214
    Glyph *glyph;
215

    
216
    dtext->class = &drawtext_class;
217
    av_opt_set_defaults2(dtext, 0, 0);
218
    dtext->fontcolor_string = av_strdup("black");
219
    dtext->boxcolor_string = av_strdup("white");
220

    
221
    if ((err = (av_set_options_string(dtext, args, "=", ":"))) < 0) {
222
        av_log(ctx, AV_LOG_ERROR, "Error parsing options string: '%s'\n", args);
223
        return err;
224
    }
225

    
226
    if (!dtext->fontfile) {
227
        av_log(ctx, AV_LOG_ERROR, "No font filename provided\n");
228
        return AVERROR(EINVAL);
229
    }
230

    
231
    if (dtext->textfile) {
232
        uint8_t *textbuf;
233
        size_t textbuf_size;
234

    
235
        if (dtext->text) {
236
            av_log(ctx, AV_LOG_ERROR,
237
                   "Both text and text file provided. Please provide only one\n");
238
            return AVERROR(EINVAL);
239
        }
240
        if ((err = av_file_map(dtext->textfile, &textbuf, &textbuf_size, 0, ctx)) < 0) {
241
            av_log(ctx, AV_LOG_ERROR,
242
                   "The text file '%s' could not be read or is empty\n",
243
                   dtext->textfile);
244
            return err;
245
        }
246

    
247
        if (!(dtext->text = av_malloc(textbuf_size+1)))
248
            return AVERROR(ENOMEM);
249
        memcpy(dtext->text, textbuf, textbuf_size);
250
        dtext->text[textbuf_size] = 0;
251
        av_file_unmap(textbuf, textbuf_size);
252
    }
253

    
254
    if (!dtext->text) {
255
        av_log(ctx, AV_LOG_ERROR,
256
               "Either text or a valid file must be provided\n");
257
        return AVERROR(EINVAL);
258
    }
259

    
260
    if ((err = av_parse_color(dtext->fontcolor_rgba, dtext->fontcolor_string, -1, ctx))) {
261
        av_log(ctx, AV_LOG_ERROR,
262
               "Invalid font color '%s'\n", dtext->fontcolor_string);
263
        return err;
264
    }
265

    
266
    if ((err = av_parse_color(dtext->boxcolor_rgba, dtext->boxcolor_string, -1, ctx))) {
267
        av_log(ctx, AV_LOG_ERROR,
268
               "Invalid box color '%s'\n", dtext->boxcolor_string);
269
        return err;
270
    }
271

    
272
    if ((err = FT_Init_FreeType(&(dtext->library)))) {
273
        av_log(ctx, AV_LOG_ERROR,
274
               "Could not load FreeType: %s\n", FT_ERRMSG(err));
275
        return AVERROR(EINVAL);
276
    }
277

    
278
    /* load the face, and set up the encoding, which is by default UTF-8 */
279
    if ((err = FT_New_Face(dtext->library, dtext->fontfile, 0, &dtext->face))) {
280
        av_log(ctx, AV_LOG_ERROR, "Could not load fontface from file '%s': %s\n",
281
               dtext->fontfile, FT_ERRMSG(err));
282
        return AVERROR(EINVAL);
283
    }
284
    if ((err = FT_Set_Pixel_Sizes(dtext->face, 0, dtext->fontsize))) {
285
        av_log(ctx, AV_LOG_ERROR, "Could not set font size to %d pixels: %s\n",
286
               dtext->fontsize, FT_ERRMSG(err));
287
        return AVERROR(EINVAL);
288
    }
289

    
290
    dtext->use_kerning = FT_HAS_KERNING(dtext->face);
291

    
292
    /* load the fallback glyph with code 0 */
293
    load_glyph(ctx, NULL, 0);
294

    
295
    /* set the tabsize in pixels */
296
    if ((err = load_glyph(ctx, &glyph, ' ') < 0)) {
297
        av_log(ctx, AV_LOG_ERROR, "Could not set tabsize.\n");
298
        return err;
299
    }
300
    dtext->tabsize *= glyph->advance;
301

    
302
#if !HAVE_LOCALTIME_R
303
    av_log(ctx, AV_LOG_WARNING, "strftime() expansion unavailable!\n");
304
#endif
305

    
306
    return 0;
307
}
308

    
309
static int query_formats(AVFilterContext *ctx)
310
{
311
    static const enum PixelFormat pix_fmts[] = {
312
        PIX_FMT_ARGB,    PIX_FMT_RGBA,
313
        PIX_FMT_ABGR,    PIX_FMT_BGRA,
314
        PIX_FMT_RGB24,   PIX_FMT_BGR24,
315
        PIX_FMT_YUV420P, PIX_FMT_YUV444P,
316
        PIX_FMT_YUV422P, PIX_FMT_YUV411P,
317
        PIX_FMT_YUV410P, PIX_FMT_YUV440P,
318
        PIX_FMT_NONE
319
    };
320

    
321
    avfilter_set_common_formats(ctx, avfilter_make_format_list(pix_fmts));
322
    return 0;
323
}
324

    
325
static int glyph_enu_free(void *opaque, void *elem)
326
{
327
    av_free(elem);
328
    return 0;
329
}
330

    
331
static av_cold void uninit(AVFilterContext *ctx)
332
{
333
    DrawTextContext *dtext = ctx->priv;
334
    int i;
335

    
336
    av_freep(&dtext->fontfile);
337
    av_freep(&dtext->text);
338
    av_freep(&dtext->fontcolor_string);
339
    av_freep(&dtext->boxcolor_string);
340
    av_freep(&dtext->positions);
341
    av_tree_enumerate(dtext->glyphs, NULL, NULL, glyph_enu_free);
342
    av_tree_destroy(dtext->glyphs);
343
    dtext->glyphs = 0;
344
    FT_Done_Face(dtext->face);
345
    FT_Done_FreeType(dtext->library);
346

    
347
    for (i = 0; i < 4; i++) {
348
        av_freep(&dtext->box_line[i]);
349
        dtext->pixel_step[i] = 0;
350
    }
351

    
352
}
353

    
354
static int config_input(AVFilterLink *inlink)
355
{
356
    DrawTextContext *dtext = inlink->dst->priv;
357
    const AVPixFmtDescriptor *pix_desc = &av_pix_fmt_descriptors[inlink->format];
358
    int ret;
359

    
360
    dtext->hsub = pix_desc->log2_chroma_w;
361
    dtext->vsub = pix_desc->log2_chroma_h;
362

    
363
    if ((ret =
364
         ff_fill_line_with_color(dtext->box_line, dtext->pixel_step,
365
                                 inlink->w, dtext->boxcolor,
366
                                 inlink->format, dtext->boxcolor_rgba,
367
                                 &dtext->is_packed_rgb, dtext->rgba_map)) < 0)
368
        return ret;
369

    
370
    if (!dtext->is_packed_rgb) {
371
        uint8_t *rgba = dtext->fontcolor_rgba;
372
        dtext->fontcolor[0] = RGB_TO_Y_CCIR(rgba[0], rgba[1], rgba[2]);
373
        dtext->fontcolor[1] = RGB_TO_U_CCIR(rgba[0], rgba[1], rgba[2], 0);
374
        dtext->fontcolor[2] = RGB_TO_V_CCIR(rgba[0], rgba[1], rgba[2], 0);
375
        dtext->fontcolor[3] = rgba[3];
376
    }
377

    
378
    return 0;
379
}
380

    
381
#define GET_BITMAP_VAL(r, c)                                            \
382
    bitmap->pixel_mode == FT_PIXEL_MODE_MONO ?                          \
383
        (bitmap->buffer[(r) * bitmap->pitch + ((c)>>3)] & (0x80 >> ((c)&7))) * 255 : \
384
         bitmap->buffer[(r) * bitmap->pitch +  (c)]
385

    
386
#define SET_PIXEL_YUV(picref, yuva_color, val, x, y, hsub, vsub) {           \
387
    luma_pos    = ((x)          ) + ((y)          ) * picref->linesize[0]; \
388
    chroma_pos1 = ((x) >> (hsub)) + ((y) >> (vsub)) * picref->linesize[1]; \
389
    chroma_pos2 = ((x) >> (hsub)) + ((y) >> (vsub)) * picref->linesize[2]; \
390
    alpha = (yuva_color[3] * (val)) / 255;                               \
391
    picref->data[0][luma_pos] = (alpha * yuva_color[0] + (255 - alpha) * picref->data[0][luma_pos]) >> 8; \
392
    picref->data[1][chroma_pos1] = (alpha * yuva_color[1] + (255 - alpha) * picref->data[1][chroma_pos1]) >> 8; \
393
    picref->data[2][chroma_pos2] = (alpha * yuva_color[2] + (255 - alpha) * picref->data[2][chroma_pos2]) >> 8; \
394
}
395

    
396
static inline int draw_glyph_yuv(AVFilterBufferRef *picref, FT_Bitmap *bitmap, unsigned int x,
397
                                 unsigned int y, unsigned int width, unsigned int height,
398
                                 const uint8_t yuva_color[4], int hsub, int vsub)
399
{
400
    int r, c, alpha;
401
    unsigned int luma_pos, chroma_pos1, chroma_pos2;
402
    uint8_t src_val, dst_pixel[4];
403

    
404
    for (r = 0; r < bitmap->rows && r+y < height; r++) {
405
        for (c = 0; c < bitmap->width && c+x < width; c++) {
406
            /* get pixel in the picref (destination) */
407
            dst_pixel[0] = picref->data[0][  c+x           +  (y+r)          * picref->linesize[0]];
408
            dst_pixel[1] = picref->data[1][((c+x) >> hsub) + ((y+r) >> vsub) * picref->linesize[1]];
409
            dst_pixel[2] = picref->data[2][((c+x) >> hsub) + ((y+r) >> vsub) * picref->linesize[2]];
410

    
411
            /* get intensity value in the glyph bitmap (source) */
412
            src_val = GET_BITMAP_VAL(r, c);
413
            if (!src_val)
414
                continue;
415

    
416
            SET_PIXEL_YUV(picref, yuva_color, src_val, c+x, y+r, hsub, vsub);
417
        }
418
    }
419

    
420
    return 0;
421
}
422

    
423
#define SET_PIXEL_RGB(picref, rgba_color, val, x, y, pixel_step, r_off, g_off, b_off, a_off) { \
424
    p   = picref->data[0] + (x) * pixel_step + ((y) * picref->linesize[0]); \
425
    alpha = (rgba_color[3] * (val)) / 255;                              \
426
    *(p+r_off) = (alpha * rgba_color[0] + (255 - alpha) * *(p+r_off)) >> 8; \
427
    *(p+g_off) = (alpha * rgba_color[1] + (255 - alpha) * *(p+g_off)) >> 8; \
428
    *(p+b_off) = (alpha * rgba_color[2] + (255 - alpha) * *(p+b_off)) >> 8; \
429
}
430

    
431
static inline int draw_glyph_rgb(AVFilterBufferRef *picref, FT_Bitmap *bitmap,
432
                                 unsigned int x, unsigned int y,
433
                                 unsigned int width, unsigned int height, int pixel_step,
434
                                 const uint8_t rgba_color[4], const uint8_t rgba_map[4])
435
{
436
    int r, c, alpha;
437
    uint8_t *p;
438
    uint8_t src_val, dst_pixel[4];
439

    
440
    for (r = 0; r < bitmap->rows && r+y < height; r++) {
441
        for (c = 0; c < bitmap->width && c+x < width; c++) {
442
            /* get pixel in the picref (destination) */
443
            dst_pixel[0] = picref->data[0][(c+x + rgba_map[0]) * pixel_step +
444
                                           (y+r) * picref->linesize[0]];
445
            dst_pixel[1] = picref->data[0][(c+x + rgba_map[1]) * pixel_step +
446
                                           (y+r) * picref->linesize[0]];
447
            dst_pixel[2] = picref->data[0][(c+x + rgba_map[2]) * pixel_step +
448
                                           (y+r) * picref->linesize[0]];
449

    
450
            /* get intensity value in the glyph bitmap (source) */
451
            src_val = GET_BITMAP_VAL(r, c);
452
            if (!src_val)
453
                continue;
454

    
455
            SET_PIXEL_RGB(picref, rgba_color, src_val, c+x, y+r, pixel_step,
456
                          rgba_map[0], rgba_map[1], rgba_map[2], rgba_map[3]);
457
        }
458
    }
459

    
460
    return 0;
461
}
462

    
463
static inline void drawbox(AVFilterBufferRef *picref, unsigned int x, unsigned int y,
464
                           unsigned int width, unsigned int height,
465
                           uint8_t *line[4], int pixel_step[4], uint8_t color[4],
466
                           int hsub, int vsub, int is_rgba_packed, uint8_t rgba_map[4])
467
{
468
    int i, j, alpha;
469

    
470
    if (color[3] != 0xFF) {
471
        if (is_rgba_packed) {
472
            uint8_t *p;
473
            for (j = 0; j < height; j++)
474
                for (i = 0; i < width; i++)
475
                    SET_PIXEL_RGB(picref, color, 255, i+x, y+j, pixel_step[0],
476
                                  rgba_map[0], rgba_map[1], rgba_map[2], rgba_map[3]);
477
        } else {
478
            unsigned int luma_pos, chroma_pos1, chroma_pos2;
479
            for (j = 0; j < height; j++)
480
                for (i = 0; i < width; i++)
481
                    SET_PIXEL_YUV(picref, color, 255, i+x, y+j, hsub, vsub);
482
        }
483
    } else {
484
        ff_draw_rectangle(picref->data, picref->linesize,
485
                          line, pixel_step, hsub, vsub,
486
                          x, y, width, height);
487
    }
488
}
489

    
490
static inline int is_newline(uint32_t c)
491
{
492
    return (c == '\n' || c == '\r' || c == '\f' || c == '\v');
493
}
494

    
495
static int draw_text(AVFilterContext *ctx, AVFilterBufferRef *picref,
496
                     int width, int height)
497
{
498
    DrawTextContext *dtext = ctx->priv;
499
    uint32_t code = 0, prev_code = 0;
500
    int x = 0, y = 0, i = 0;
501
    int text_height, baseline;
502
    uint8_t *p;
503
    int str_w = 0;
504
    int y_min = 32000, y_max = -32000;
505
    FT_Vector delta;
506
    Glyph *glyph = NULL, *prev_glyph = NULL;
507
    Glyph dummy = { 0 };
508

    
509
    if (dtext->text != dtext->text_priv) {
510
#if HAVE_LOCALTIME_R
511
        time_t now = time(0);
512
        struct tm ltime;
513
        uint8_t *buf = NULL;
514
        int     buflen = 2*strlen(dtext->text) + 1, len;
515

    
516
        localtime_r(&now, &ltime);
517

    
518
        while ((buf = av_realloc(buf, buflen))) {
519
            *buf = 1;
520
            if ((len = strftime(buf, buflen, dtext->text, &ltime)) != 0 || *buf == 0)
521
                break;
522
            buflen *= 2;
523
        }
524
        if (!buf)
525
            return AVERROR(ENOMEM);
526
        av_freep(&dtext->text);
527
        dtext->text = dtext->text_priv = buf;
528
#else
529
        dtext->text_priv = dtext->text;
530
#endif
531
        if (!(dtext->positions = av_realloc(dtext->positions,
532
                                            strlen(dtext->text)*sizeof(*dtext->positions))))
533
            return AVERROR(ENOMEM);
534
    }
535

    
536
    x = dtext->x;
537
    y = dtext->y;
538

    
539
    /* load and cache glyphs */
540
    for (i = 0, p = dtext->text; *p; i++) {
541
        GET_UTF8(code, *p++, continue;);
542

    
543
        /* get glyph */
544
        dummy.code = code;
545
        glyph = av_tree_find(dtext->glyphs, &dummy, glyph_cmp, NULL);
546
        if (!glyph)
547
            load_glyph(ctx, &glyph, code);
548

    
549
        y_min = FFMIN(glyph->bbox.yMin, y_min);
550
        y_max = FFMAX(glyph->bbox.yMax, y_max);
551
    }
552
    text_height = y_max - y_min;
553
    baseline    = y_max;
554

    
555
    /* compute and save position for each glyph */
556
    glyph = NULL;
557
    for (i = 0, p = dtext->text; *p; i++) {
558
        GET_UTF8(code, *p++, continue;);
559

    
560
        /* skip the \n in the sequence \r\n */
561
        if (prev_code == '\r' && code == '\n')
562
            continue;
563

    
564
        prev_code = code;
565
        if (is_newline(code)) {
566
            str_w = FFMAX(str_w, x - dtext->x);
567
            y += text_height;
568
            x = dtext->x;
569
            continue;
570
        }
571

    
572
        /* get glyph */
573
        prev_glyph = glyph;
574
        dummy.code = code;
575
        glyph = av_tree_find(dtext->glyphs, &dummy, glyph_cmp, NULL);
576

    
577
        /* kerning */
578
        if (dtext->use_kerning && prev_glyph && glyph->code) {
579
            FT_Get_Kerning(dtext->face, prev_glyph->code, glyph->code,
580
                           ft_kerning_default, &delta);
581
            x += delta.x >> 6;
582
        }
583

    
584
        if (x + glyph->bbox.xMax >= width) {
585
            str_w = FFMAX(str_w, x - dtext->x);
586
            y += text_height;
587
            x = dtext->x;
588
        }
589

    
590
        /* save position */
591
        dtext->positions[i].x = x + glyph->bitmap_left;
592
        dtext->positions[i].y = y - glyph->bitmap_top + baseline;
593
        if (code == '\t') x  = (x / dtext->tabsize + 1)*dtext->tabsize;
594
        else              x += glyph->advance;
595
    }
596

    
597
    str_w = FFMIN(width - dtext->x - 1, FFMAX(str_w, x - dtext->x));
598
    y     = FFMIN(y + text_height, height - 1);
599

    
600
    /* draw box */
601
    if (dtext->draw_box)
602
        drawbox(picref, dtext->x, dtext->y, str_w, y-dtext->y,
603
                dtext->box_line, dtext->pixel_step, dtext->boxcolor,
604
                dtext->hsub, dtext->vsub, dtext->is_packed_rgb, dtext->rgba_map);
605

    
606
    /* draw glyphs */
607
    for (i = 0, p = dtext->text; *p; i++) {
608
        Glyph dummy = { 0 };
609
        GET_UTF8(code, *p++, continue;);
610

    
611
        /* skip new line chars, just go to new line */
612
        if (is_newline(code) || code == ' ' || code == '\t')
613
            continue;
614

    
615
        dummy.code = code;
616
        glyph = av_tree_find(dtext->glyphs, &dummy, glyph_cmp, NULL);
617

    
618
        if (glyph->bitmap.pixel_mode != FT_PIXEL_MODE_MONO &&
619
            glyph->bitmap.pixel_mode != FT_PIXEL_MODE_GRAY)
620
            return AVERROR(EINVAL);
621

    
622
        if (dtext->is_packed_rgb) {
623
            draw_glyph_rgb(picref, &glyph->bitmap,
624
                           dtext->positions[i].x, dtext->positions[i].y, width, height,
625
                           dtext->pixel_step[0], dtext->fontcolor_rgba, dtext->rgba_map);
626
        } else {
627
            draw_glyph_yuv(picref, &glyph->bitmap,
628
                           dtext->positions[i].x, dtext->positions[i].y, width, height,
629
                           dtext->fontcolor, dtext->hsub, dtext->vsub);
630
        }
631
    }
632

    
633
    return 0;
634
}
635

    
636
static void null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir) { }
637

    
638
static void end_frame(AVFilterLink *inlink)
639
{
640
    AVFilterLink *outlink = inlink->dst->outputs[0];
641
    AVFilterBufferRef *picref = inlink->cur_buf;
642

    
643
    draw_text(inlink->dst, picref, picref->video->w, picref->video->h);
644

    
645
    avfilter_draw_slice(outlink, 0, picref->video->h, 1);
646
    avfilter_end_frame(outlink);
647
}
648

    
649
AVFilter avfilter_vf_drawtext = {
650
    .name          = "drawtext",
651
    .description   = NULL_IF_CONFIG_SMALL("Draw text on top of video frames using libfreetype library."),
652
    .priv_size     = sizeof(DrawTextContext),
653
    .init          = init,
654
    .uninit        = uninit,
655
    .query_formats = query_formats,
656

    
657
    .inputs    = (AVFilterPad[]) {{ .name             = "default",
658
                                    .type             = AVMEDIA_TYPE_VIDEO,
659
                                    .get_video_buffer = avfilter_null_get_video_buffer,
660
                                    .start_frame      = avfilter_null_start_frame,
661
                                    .draw_slice       = null_draw_slice,
662
                                    .end_frame        = end_frame,
663
                                    .config_props     = config_input,
664
                                    .min_perms        = AV_PERM_WRITE |
665
                                                        AV_PERM_READ,
666
                                    .rej_perms        = AV_PERM_PRESERVE },
667
                                  { .name = NULL}},
668
    .outputs   = (AVFilterPad[]) {{ .name             = "default",
669
                                    .type             = AVMEDIA_TYPE_VIDEO, },
670
                                  { .name = NULL}},
671
};