• Main Page
  • Related Pages
  • Modules
  • Data Structures
  • Files
  • File List
  • Globals

libavfilter/vf_drawtext.c

Go to the documentation of this file.
00001 /*
00002  * Copyright (c) 2011 Stefano Sabatini
00003  * Copyright (c) 2010 S.N. Hemanth Meenakshisundaram
00004  * Copyright (c) 2003 Gustavo Sverzut Barbieri <gsbarbieri@yahoo.com.br>
00005  *
00006  * This file is part of FFmpeg.
00007  *
00008  * FFmpeg is free software; you can redistribute it and/or
00009  * modify it under the terms of the GNU Lesser General Public
00010  * License as published by the Free Software Foundation; either
00011  * version 2.1 of the License, or (at your option) any later version.
00012  *
00013  * FFmpeg is distributed in the hope that it will be useful,
00014  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00015  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00016  * Lesser General Public License for more details.
00017  *
00018  * You should have received a copy of the GNU Lesser General Public
00019  * License along with FFmpeg; if not, write to the Free Software
00020  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00021  */
00022 
00029 #include <sys/time.h>
00030 #include <time.h>
00031 
00032 #include "config.h"
00033 #include "libavcodec/timecode.h"
00034 #include "libavutil/avstring.h"
00035 #include "libavutil/colorspace.h"
00036 #include "libavutil/file.h"
00037 #include "libavutil/eval.h"
00038 #include "libavutil/opt.h"
00039 #include "libavutil/random_seed.h"
00040 #include "libavutil/parseutils.h"
00041 #include "libavutil/pixdesc.h"
00042 #include "libavutil/tree.h"
00043 #include "libavutil/lfg.h"
00044 #include "avfilter.h"
00045 #include "drawutils.h"
00046 
00047 #undef time
00048 
00049 #include <ft2build.h>
00050 #include <freetype/config/ftheader.h>
00051 #include FT_FREETYPE_H
00052 #include FT_GLYPH_H
00053 
00054 static const char * const var_names[] = {
00055     "main_w", "w", "W",       
00056     "main_h", "h", "H",       
00057     "tw", "text_w",           
00058     "th", "text_h",           
00059     "max_glyph_w",            
00060     "max_glyph_h",            
00061     "max_glyph_a", "ascent",  
00062     "max_glyph_d", "descent", 
00063     "line_h", "lh",           
00064     "sar",
00065     "dar",
00066     "hsub",
00067     "vsub",
00068     "x",
00069     "y",
00070     "n",                      
00071     "t",                      
00072     NULL
00073 };
00074 
00075 static const char *fun2_names[] = {
00076     "rand",
00077 };
00078 
00079 static double drand(void *opaque, double min, double max)
00080 {
00081     return min + (max-min) / UINT_MAX * av_lfg_get(opaque);
00082 }
00083 
00084 typedef double (*eval_func2)(void *, double a, double b);
00085 
00086 static const eval_func2 fun2[] = {
00087     drand,
00088     NULL
00089 };
00090 
00091 enum var_name {
00092     VAR_MAIN_W, VAR_w, VAR_W,
00093     VAR_MAIN_H, VAR_h, VAR_H,
00094     VAR_TW, VAR_TEXT_W,
00095     VAR_TH, VAR_TEXT_H,
00096     VAR_MAX_GLYPH_W,
00097     VAR_MAX_GLYPH_H,
00098     VAR_MAX_GLYPH_A, VAR_ASCENT,
00099     VAR_MAX_GLYPH_D, VAR_DESCENT,
00100     VAR_LINE_H, VAR_LH,
00101     VAR_SAR,
00102     VAR_DAR,
00103     VAR_HSUB,
00104     VAR_VSUB,
00105     VAR_X,
00106     VAR_Y,
00107     VAR_N,
00108     VAR_T,
00109     VAR_VARS_NB
00110 };
00111 
00112 typedef struct {
00113     const AVClass *class;
00114     int reinit;                     
00115     uint8_t *fontfile;              
00116     uint8_t *text;                  
00117     uint8_t *expanded_text;         
00118     size_t   expanded_text_size;    
00119     int ft_load_flags;              
00120     FT_Vector *positions;           
00121     size_t nb_positions;            
00122     char *textfile;                 
00123     int x;                          
00124     int y;                          
00125     int max_glyph_w;                
00126     int max_glyph_h;                
00127     int shadowx, shadowy;
00128     unsigned int fontsize;          
00129     char *fontcolor_string;         
00130     char *boxcolor_string;          
00131     char *shadowcolor_string;       
00132     uint8_t fontcolor[4];           
00133     uint8_t boxcolor[4];            
00134     uint8_t shadowcolor[4];         
00135     uint8_t fontcolor_rgba[4];      
00136     uint8_t boxcolor_rgba[4];       
00137     uint8_t shadowcolor_rgba[4];    
00138 
00139     short int draw_box;             
00140     int use_kerning;                
00141     int tabsize;                    
00142 
00143     FT_Library library;             
00144     FT_Face face;                   
00145     struct AVTreeNode *glyphs;      
00146     int hsub, vsub;                 
00147     int is_packed_rgb;
00148     int pixel_step[4];              
00149     uint8_t rgba_map[4];            
00150     uint8_t *box_line[4];           
00151     char *x_expr;                   
00152     char *y_expr;                   
00153     AVExpr *x_pexpr, *y_pexpr;      
00154     int64_t basetime;               
00155     double var_values[VAR_VARS_NB];
00156     char   *d_expr;
00157     AVExpr *d_pexpr;
00158     int draw;                       
00159     AVLFG  prng;                    
00160     struct ff_timecode tc;
00161     int frame_id;
00162 } DrawTextContext;
00163 
00164 #define OFFSET(x) offsetof(DrawTextContext, x)
00165 
00166 static const AVOption drawtext_options[]= {
00167 {"fontfile", "set font file",        OFFSET(fontfile),           AV_OPT_TYPE_STRING, {.str=NULL},  CHAR_MIN, CHAR_MAX },
00168 {"text",     "set text",             OFFSET(text),               AV_OPT_TYPE_STRING, {.str=NULL},  CHAR_MIN, CHAR_MAX },
00169 {"textfile", "set text file",        OFFSET(textfile),           AV_OPT_TYPE_STRING, {.str=NULL},  CHAR_MIN, CHAR_MAX },
00170 {"fontcolor",   "set foreground color", OFFSET(fontcolor_string),   AV_OPT_TYPE_STRING, {.str="black"}, CHAR_MIN, CHAR_MAX },
00171 {"boxcolor",    "set box color",        OFFSET(boxcolor_string),    AV_OPT_TYPE_STRING, {.str="white"}, CHAR_MIN, CHAR_MAX },
00172 {"shadowcolor", "set shadow color",     OFFSET(shadowcolor_string), AV_OPT_TYPE_STRING, {.str="black"}, CHAR_MIN, CHAR_MAX },
00173 {"box",      "set box",              OFFSET(draw_box),           AV_OPT_TYPE_INT,    {.dbl=0},     0,        1        },
00174 {"fontsize", "set font size",        OFFSET(fontsize),           AV_OPT_TYPE_INT,    {.dbl=16},    1,        INT_MAX  },
00175 {"x",        "set x expression",     OFFSET(x_expr),             AV_OPT_TYPE_STRING, {.str="0"},   CHAR_MIN, CHAR_MAX },
00176 {"y",        "set y expression",     OFFSET(y_expr),             AV_OPT_TYPE_STRING, {.str="0"},   CHAR_MIN, CHAR_MAX },
00177 {"shadowx",  "set x",                OFFSET(shadowx),            AV_OPT_TYPE_INT,    {.dbl=0},     INT_MIN,  INT_MAX  },
00178 {"shadowy",  "set y",                OFFSET(shadowy),            AV_OPT_TYPE_INT,    {.dbl=0},     INT_MIN,  INT_MAX  },
00179 {"tabsize",  "set tab size",         OFFSET(tabsize),            AV_OPT_TYPE_INT,    {.dbl=4},     0,        INT_MAX  },
00180 {"basetime", "set base time",        OFFSET(basetime),           AV_OPT_TYPE_INT64,  {.dbl=AV_NOPTS_VALUE},     INT64_MIN,        INT64_MAX  },
00181 {"draw",     "if false do not draw", OFFSET(d_expr),             AV_OPT_TYPE_STRING, {.str="1"},   CHAR_MIN, CHAR_MAX },
00182 {"timecode", "set initial timecode", OFFSET(tc.str),             AV_OPT_TYPE_STRING, {.str=NULL},  CHAR_MIN, CHAR_MAX },
00183 {"r",        "set rate (timecode only)", OFFSET(tc.rate),        AV_OPT_TYPE_RATIONAL, {.dbl=0},          0,  INT_MAX },
00184 {"rate",     "set rate (timecode only)", OFFSET(tc.rate),        AV_OPT_TYPE_RATIONAL, {.dbl=0},          0,  INT_MAX },
00185 
00186 /* FT_LOAD_* flags */
00187 {"ft_load_flags", "set font loading flags for libfreetype",   OFFSET(ft_load_flags),  AV_OPT_TYPE_FLAGS,  {.dbl=FT_LOAD_DEFAULT|FT_LOAD_RENDER}, 0, INT_MAX, 0, "ft_load_flags" },
00188 {"default",                     "set default",                     0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_DEFAULT},                     INT_MIN, INT_MAX, 0, "ft_load_flags" },
00189 {"no_scale",                    "set no_scale",                    0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_NO_SCALE},                    INT_MIN, INT_MAX, 0, "ft_load_flags" },
00190 {"no_hinting",                  "set no_hinting",                  0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_NO_HINTING},                  INT_MIN, INT_MAX, 0, "ft_load_flags" },
00191 {"render",                      "set render",                      0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_RENDER},                      INT_MIN, INT_MAX, 0, "ft_load_flags" },
00192 {"no_bitmap",                   "set no_bitmap",                   0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_NO_BITMAP},                   INT_MIN, INT_MAX, 0, "ft_load_flags" },
00193 {"vertical_layout",             "set vertical_layout",             0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_VERTICAL_LAYOUT},             INT_MIN, INT_MAX, 0, "ft_load_flags" },
00194 {"force_autohint",              "set force_autohint",              0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_FORCE_AUTOHINT},              INT_MIN, INT_MAX, 0, "ft_load_flags" },
00195 {"crop_bitmap",                 "set crop_bitmap",                 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_CROP_BITMAP},                 INT_MIN, INT_MAX, 0, "ft_load_flags" },
00196 {"pedantic",                    "set pedantic",                    0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_PEDANTIC},                    INT_MIN, INT_MAX, 0, "ft_load_flags" },
00197 {"ignore_global_advance_width", "set ignore_global_advance_width", 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH}, INT_MIN, INT_MAX, 0, "ft_load_flags" },
00198 {"no_recurse",                  "set no_recurse",                  0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_NO_RECURSE},                  INT_MIN, INT_MAX, 0, "ft_load_flags" },
00199 {"ignore_transform",            "set ignore_transform",            0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_IGNORE_TRANSFORM},            INT_MIN, INT_MAX, 0, "ft_load_flags" },
00200 {"monochrome",                  "set monochrome",                  0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_MONOCHROME},                  INT_MIN, INT_MAX, 0, "ft_load_flags" },
00201 {"linear_design",               "set linear_design",               0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_LINEAR_DESIGN},               INT_MIN, INT_MAX, 0, "ft_load_flags" },
00202 {"no_autohint",                 "set no_autohint",                 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_NO_AUTOHINT},                 INT_MIN, INT_MAX, 0, "ft_load_flags" },
00203 {NULL},
00204 };
00205 
00206 static const char *drawtext_get_name(void *ctx)
00207 {
00208     return "drawtext";
00209 }
00210 
00211 static const AVClass drawtext_class = {
00212     "DrawTextContext",
00213     drawtext_get_name,
00214     drawtext_options
00215 };
00216 
00217 #undef __FTERRORS_H__
00218 #define FT_ERROR_START_LIST {
00219 #define FT_ERRORDEF(e, v, s) { (e), (s) },
00220 #define FT_ERROR_END_LIST { 0, NULL } };
00221 
00222 struct ft_error
00223 {
00224     int err;
00225     const char *err_msg;
00226 } static ft_errors[] =
00227 #include FT_ERRORS_H
00228 
00229 #define FT_ERRMSG(e) ft_errors[e].err_msg
00230 
00231 typedef struct {
00232     FT_Glyph *glyph;
00233     uint32_t code;
00234     FT_Bitmap bitmap; 
00235     FT_BBox bbox;
00236     int advance;
00237     int bitmap_left;
00238     int bitmap_top;
00239 } Glyph;
00240 
00241 static int glyph_cmp(void *key, const void *b)
00242 {
00243     const Glyph *a = key, *bb = b;
00244     int64_t diff = (int64_t)a->code - (int64_t)bb->code;
00245     return diff > 0 ? 1 : diff < 0 ? -1 : 0;
00246 }
00247 
00251 static int load_glyph(AVFilterContext *ctx, Glyph **glyph_ptr, uint32_t code)
00252 {
00253     DrawTextContext *dtext = ctx->priv;
00254     Glyph *glyph;
00255     struct AVTreeNode *node = NULL;
00256     int ret;
00257 
00258     /* load glyph into dtext->face->glyph */
00259     if (FT_Load_Char(dtext->face, code, dtext->ft_load_flags))
00260         return AVERROR(EINVAL);
00261 
00262     /* save glyph */
00263     if (!(glyph = av_mallocz(sizeof(*glyph))) ||
00264         !(glyph->glyph = av_mallocz(sizeof(*glyph->glyph)))) {
00265         ret = AVERROR(ENOMEM);
00266         goto error;
00267     }
00268     glyph->code  = code;
00269 
00270     if (FT_Get_Glyph(dtext->face->glyph, glyph->glyph)) {
00271         ret = AVERROR(EINVAL);
00272         goto error;
00273     }
00274 
00275     glyph->bitmap      = dtext->face->glyph->bitmap;
00276     glyph->bitmap_left = dtext->face->glyph->bitmap_left;
00277     glyph->bitmap_top  = dtext->face->glyph->bitmap_top;
00278     glyph->advance     = dtext->face->glyph->advance.x >> 6;
00279 
00280     /* measure text height to calculate text_height (or the maximum text height) */
00281     FT_Glyph_Get_CBox(*glyph->glyph, ft_glyph_bbox_pixels, &glyph->bbox);
00282 
00283     /* cache the newly created glyph */
00284     if (!(node = av_mallocz(av_tree_node_size))) {
00285         ret = AVERROR(ENOMEM);
00286         goto error;
00287     }
00288     av_tree_insert(&dtext->glyphs, glyph, glyph_cmp, &node);
00289 
00290     if (glyph_ptr)
00291         *glyph_ptr = glyph;
00292     return 0;
00293 
00294 error:
00295     if (glyph)
00296         av_freep(&glyph->glyph);
00297     av_freep(&glyph);
00298     av_freep(&node);
00299     return ret;
00300 }
00301 
00302 static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
00303 {
00304     int err;
00305     DrawTextContext *dtext = ctx->priv;
00306     Glyph *glyph;
00307 
00308     dtext->class = &drawtext_class;
00309     av_opt_set_defaults(dtext);
00310 
00311     if ((err = (av_set_options_string(dtext, args, "=", ":"))) < 0) {
00312         av_log(ctx, AV_LOG_ERROR, "Error parsing options string: '%s'\n", args);
00313         return err;
00314     }
00315 
00316     if (!dtext->fontfile) {
00317         av_log(ctx, AV_LOG_ERROR, "No font filename provided\n");
00318         return AVERROR(EINVAL);
00319     }
00320 
00321     if (dtext->textfile) {
00322         uint8_t *textbuf;
00323         size_t textbuf_size;
00324 
00325         if (dtext->text) {
00326             av_log(ctx, AV_LOG_ERROR,
00327                    "Both text and text file provided. Please provide only one\n");
00328             return AVERROR(EINVAL);
00329         }
00330         if ((err = av_file_map(dtext->textfile, &textbuf, &textbuf_size, 0, ctx)) < 0) {
00331             av_log(ctx, AV_LOG_ERROR,
00332                    "The text file '%s' could not be read or is empty\n",
00333                    dtext->textfile);
00334             return err;
00335         }
00336 
00337         if (!(dtext->text = av_malloc(textbuf_size+1)))
00338             return AVERROR(ENOMEM);
00339         memcpy(dtext->text, textbuf, textbuf_size);
00340         dtext->text[textbuf_size] = 0;
00341         av_file_unmap(textbuf, textbuf_size);
00342     }
00343 
00344     if (dtext->tc.str) {
00345 #if CONFIG_AVCODEC
00346         if (avpriv_init_smpte_timecode(ctx, &dtext->tc) < 0)
00347             return AVERROR(EINVAL);
00348         if (!dtext->text)
00349             dtext->text = av_strdup("");
00350 #else
00351         av_log(ctx, AV_LOG_ERROR,
00352                "Timecode options are only available if libavfilter is built with libavcodec enabled.\n");
00353         return AVERROR(EINVAL);
00354 #endif
00355     }
00356 
00357     if (!dtext->text) {
00358         av_log(ctx, AV_LOG_ERROR,
00359                "Either text, a valid file or a timecode must be provided\n");
00360         return AVERROR(EINVAL);
00361     }
00362 
00363     if ((err = av_parse_color(dtext->fontcolor_rgba, dtext->fontcolor_string, -1, ctx))) {
00364         av_log(ctx, AV_LOG_ERROR,
00365                "Invalid font color '%s'\n", dtext->fontcolor_string);
00366         return err;
00367     }
00368 
00369     if ((err = av_parse_color(dtext->boxcolor_rgba, dtext->boxcolor_string, -1, ctx))) {
00370         av_log(ctx, AV_LOG_ERROR,
00371                "Invalid box color '%s'\n", dtext->boxcolor_string);
00372         return err;
00373     }
00374 
00375     if ((err = av_parse_color(dtext->shadowcolor_rgba, dtext->shadowcolor_string, -1, ctx))) {
00376         av_log(ctx, AV_LOG_ERROR,
00377                "Invalid shadow color '%s'\n", dtext->shadowcolor_string);
00378         return err;
00379     }
00380 
00381     if ((err = FT_Init_FreeType(&(dtext->library)))) {
00382         av_log(ctx, AV_LOG_ERROR,
00383                "Could not load FreeType: %s\n", FT_ERRMSG(err));
00384         return AVERROR(EINVAL);
00385     }
00386 
00387     /* load the face, and set up the encoding, which is by default UTF-8 */
00388     if ((err = FT_New_Face(dtext->library, dtext->fontfile, 0, &dtext->face))) {
00389         av_log(ctx, AV_LOG_ERROR, "Could not load fontface from file '%s': %s\n",
00390                dtext->fontfile, FT_ERRMSG(err));
00391         return AVERROR(EINVAL);
00392     }
00393     if ((err = FT_Set_Pixel_Sizes(dtext->face, 0, dtext->fontsize))) {
00394         av_log(ctx, AV_LOG_ERROR, "Could not set font size to %d pixels: %s\n",
00395                dtext->fontsize, FT_ERRMSG(err));
00396         return AVERROR(EINVAL);
00397     }
00398 
00399     dtext->use_kerning = FT_HAS_KERNING(dtext->face);
00400 
00401     /* load the fallback glyph with code 0 */
00402     load_glyph(ctx, NULL, 0);
00403 
00404     /* set the tabsize in pixels */
00405     if ((err = load_glyph(ctx, &glyph, ' ')) < 0) {
00406         av_log(ctx, AV_LOG_ERROR, "Could not set tabsize.\n");
00407         return err;
00408     }
00409     dtext->tabsize *= glyph->advance;
00410 
00411     return 0;
00412 }
00413 
00414 static int query_formats(AVFilterContext *ctx)
00415 {
00416     static const enum PixelFormat pix_fmts[] = {
00417         PIX_FMT_ARGB,    PIX_FMT_RGBA,
00418         PIX_FMT_ABGR,    PIX_FMT_BGRA,
00419         PIX_FMT_RGB24,   PIX_FMT_BGR24,
00420         PIX_FMT_YUV420P, PIX_FMT_YUV444P,
00421         PIX_FMT_YUV422P, PIX_FMT_YUV411P,
00422         PIX_FMT_YUV410P, PIX_FMT_YUV440P,
00423         PIX_FMT_NONE
00424     };
00425 
00426     avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts));
00427     return 0;
00428 }
00429 
00430 static int glyph_enu_free(void *opaque, void *elem)
00431 {
00432     av_free(elem);
00433     return 0;
00434 }
00435 
00436 static av_cold void uninit(AVFilterContext *ctx)
00437 {
00438     DrawTextContext *dtext = ctx->priv;
00439     int i;
00440 
00441     av_expr_free(dtext->x_pexpr); dtext->x_pexpr = NULL;
00442     av_expr_free(dtext->y_pexpr); dtext->y_pexpr = NULL;
00443 
00444     av_freep(&dtext->boxcolor_string);
00445     av_freep(&dtext->expanded_text);
00446     av_freep(&dtext->fontcolor_string);
00447     av_freep(&dtext->fontfile);
00448     av_freep(&dtext->shadowcolor_string);
00449     av_freep(&dtext->text);
00450     av_freep(&dtext->x_expr);
00451     av_freep(&dtext->y_expr);
00452 
00453     av_freep(&dtext->positions);
00454     dtext->nb_positions = 0;
00455 
00456     av_tree_enumerate(dtext->glyphs, NULL, NULL, glyph_enu_free);
00457     av_tree_destroy(dtext->glyphs);
00458     dtext->glyphs = NULL;
00459 
00460     FT_Done_Face(dtext->face);
00461     FT_Done_FreeType(dtext->library);
00462 
00463     for (i = 0; i < 4; i++) {
00464         av_freep(&dtext->box_line[i]);
00465         dtext->pixel_step[i] = 0;
00466     }
00467 }
00468 
00469 static inline int is_newline(uint32_t c)
00470 {
00471     return c == '\n' || c == '\r' || c == '\f' || c == '\v';
00472 }
00473 
00474 static int config_input(AVFilterLink *inlink)
00475 {
00476     AVFilterContext *ctx = inlink->dst;
00477     DrawTextContext *dtext = ctx->priv;
00478     const AVPixFmtDescriptor *pix_desc = &av_pix_fmt_descriptors[inlink->format];
00479     int ret;
00480 
00481     dtext->hsub = pix_desc->log2_chroma_w;
00482     dtext->vsub = pix_desc->log2_chroma_h;
00483 
00484     if ((ret =
00485          ff_fill_line_with_color(dtext->box_line, dtext->pixel_step,
00486                                  inlink->w, dtext->boxcolor,
00487                                  inlink->format, dtext->boxcolor_rgba,
00488                                  &dtext->is_packed_rgb, dtext->rgba_map)) < 0)
00489         return ret;
00490 
00491     if (!dtext->is_packed_rgb) {
00492         uint8_t *rgba = dtext->fontcolor_rgba;
00493         dtext->fontcolor[0] = RGB_TO_Y_CCIR(rgba[0], rgba[1], rgba[2]);
00494         dtext->fontcolor[1] = RGB_TO_U_CCIR(rgba[0], rgba[1], rgba[2], 0);
00495         dtext->fontcolor[2] = RGB_TO_V_CCIR(rgba[0], rgba[1], rgba[2], 0);
00496         dtext->fontcolor[3] = rgba[3];
00497         rgba = dtext->shadowcolor_rgba;
00498         dtext->shadowcolor[0] = RGB_TO_Y_CCIR(rgba[0], rgba[1], rgba[2]);
00499         dtext->shadowcolor[1] = RGB_TO_U_CCIR(rgba[0], rgba[1], rgba[2], 0);
00500         dtext->shadowcolor[2] = RGB_TO_V_CCIR(rgba[0], rgba[1], rgba[2], 0);
00501         dtext->shadowcolor[3] = rgba[3];
00502     }
00503 
00504     dtext->var_values[VAR_w]     = dtext->var_values[VAR_W]     = dtext->var_values[VAR_MAIN_W] = inlink->w;
00505     dtext->var_values[VAR_h]     = dtext->var_values[VAR_H]     = dtext->var_values[VAR_MAIN_H] = inlink->h;
00506     dtext->var_values[VAR_SAR]   = inlink->sample_aspect_ratio.num ? av_q2d(inlink->sample_aspect_ratio) : 1;
00507     dtext->var_values[VAR_DAR]   = (double)inlink->w / inlink->h * dtext->var_values[VAR_SAR];
00508     dtext->var_values[VAR_HSUB]  = 1<<pix_desc->log2_chroma_w;
00509     dtext->var_values[VAR_VSUB]  = 1<<pix_desc->log2_chroma_h;
00510     dtext->var_values[VAR_X]     = NAN;
00511     dtext->var_values[VAR_Y]     = NAN;
00512     if (!dtext->reinit)
00513         dtext->var_values[VAR_N] = 0;
00514     dtext->var_values[VAR_T]     = NAN;
00515 
00516     av_lfg_init(&dtext->prng, av_get_random_seed());
00517 
00518     if ((ret = av_expr_parse(&dtext->x_pexpr, dtext->x_expr, var_names,
00519                              NULL, NULL, fun2_names, fun2, 0, ctx)) < 0 ||
00520         (ret = av_expr_parse(&dtext->y_pexpr, dtext->y_expr, var_names,
00521                              NULL, NULL, fun2_names, fun2, 0, ctx)) < 0 ||
00522         (ret = av_expr_parse(&dtext->d_pexpr, dtext->d_expr, var_names,
00523                              NULL, NULL, fun2_names, fun2, 0, ctx)) < 0)
00524 
00525         return AVERROR(EINVAL);
00526 
00527     return 0;
00528 }
00529 
00530 static int command(AVFilterContext *ctx, const char *cmd, const char *arg, char *res, int res_len, int flags)
00531 {
00532     DrawTextContext *dtext = ctx->priv;
00533 
00534     if (!strcmp(cmd, "reinit")) {
00535         int ret;
00536         uninit(ctx);
00537         dtext->reinit = 1;
00538         if ((ret = init(ctx, arg, NULL)) < 0)
00539             return ret;
00540         return config_input(ctx->inputs[0]);
00541     }
00542 
00543     return AVERROR(ENOSYS);
00544 }
00545 
00546 #define GET_BITMAP_VAL(r, c)                                            \
00547     bitmap->pixel_mode == FT_PIXEL_MODE_MONO ?                          \
00548         (bitmap->buffer[(r) * bitmap->pitch + ((c)>>3)] & (0x80 >> ((c)&7))) * 255 : \
00549          bitmap->buffer[(r) * bitmap->pitch +  (c)]
00550 
00551 #define SET_PIXEL_YUV(picref, yuva_color, val, x, y, hsub, vsub) {           \
00552     luma_pos    = ((x)          ) + ((y)          ) * picref->linesize[0]; \
00553     alpha = yuva_color[3] * (val) * 129;                               \
00554     picref->data[0][luma_pos]    = (alpha * yuva_color[0] + (255*255*129 - alpha) * picref->data[0][luma_pos]   ) >> 23; \
00555     if (((x) & ((1<<(hsub)) - 1)) == 0 && ((y) & ((1<<(vsub)) - 1)) == 0) {\
00556         chroma_pos1 = ((x) >> (hsub)) + ((y) >> (vsub)) * picref->linesize[1]; \
00557         chroma_pos2 = ((x) >> (hsub)) + ((y) >> (vsub)) * picref->linesize[2]; \
00558         picref->data[1][chroma_pos1] = (alpha * yuva_color[1] + (255*255*129 - alpha) * picref->data[1][chroma_pos1]) >> 23; \
00559         picref->data[2][chroma_pos2] = (alpha * yuva_color[2] + (255*255*129 - alpha) * picref->data[2][chroma_pos2]) >> 23; \
00560     }\
00561 }
00562 
00563 static inline int draw_glyph_yuv(AVFilterBufferRef *picref, FT_Bitmap *bitmap,
00564                                  int x, int y, int width, int height,
00565                                  const uint8_t yuva_color[4], int hsub, int vsub)
00566 {
00567     int r, c, alpha;
00568     unsigned int luma_pos, chroma_pos1, chroma_pos2;
00569     uint8_t src_val;
00570 
00571     for (r = 0; r < bitmap->rows && r+y < height; r++) {
00572         for (c = 0; c < bitmap->width && c+x < width; c++) {
00573             if (c+x < 0 || r+y < 0)
00574                 continue;
00575 
00576             /* get intensity value in the glyph bitmap (source) */
00577             src_val = GET_BITMAP_VAL(r, c);
00578             if (!src_val)
00579                 continue;
00580 
00581             SET_PIXEL_YUV(picref, yuva_color, src_val, c+x, y+r, hsub, vsub);
00582         }
00583     }
00584 
00585     return 0;
00586 }
00587 
00588 #define SET_PIXEL_RGB(picref, rgba_color, val, x, y, pixel_step, r_off, g_off, b_off, a_off) { \
00589     p   = picref->data[0] + (x) * pixel_step + ((y) * picref->linesize[0]); \
00590     alpha = rgba_color[3] * (val) * 129;                              \
00591     *(p+r_off) = (alpha * rgba_color[0] + (255*255*129 - alpha) * *(p+r_off)) >> 23; \
00592     *(p+g_off) = (alpha * rgba_color[1] + (255*255*129 - alpha) * *(p+g_off)) >> 23; \
00593     *(p+b_off) = (alpha * rgba_color[2] + (255*255*129 - alpha) * *(p+b_off)) >> 23; \
00594 }
00595 
00596 static inline int draw_glyph_rgb(AVFilterBufferRef *picref, FT_Bitmap *bitmap,
00597                                  int x, int y, int width, int height, int pixel_step,
00598                                  const uint8_t rgba_color[4], const uint8_t rgba_map[4])
00599 {
00600     int r, c, alpha;
00601     uint8_t *p;
00602     uint8_t src_val;
00603 
00604     for (r = 0; r < bitmap->rows && r+y < height; r++) {
00605         for (c = 0; c < bitmap->width && c+x < width; c++) {
00606             if (c+x < 0 || r+y < 0)
00607                 continue;
00608             /* get intensity value in the glyph bitmap (source) */
00609             src_val = GET_BITMAP_VAL(r, c);
00610             if (!src_val)
00611                 continue;
00612 
00613             SET_PIXEL_RGB(picref, rgba_color, src_val, c+x, y+r, pixel_step,
00614                           rgba_map[0], rgba_map[1], rgba_map[2], rgba_map[3]);
00615         }
00616     }
00617 
00618     return 0;
00619 }
00620 
00621 static inline void drawbox(AVFilterBufferRef *picref, int x, int y,
00622                            int width, int height,
00623                            uint8_t *line[4], int pixel_step[4], uint8_t color[4],
00624                            int hsub, int vsub, int is_rgba_packed, uint8_t rgba_map[4])
00625 {
00626     int i, j, alpha;
00627 
00628     if (color[3] != 0xFF) {
00629         if (is_rgba_packed) {
00630             uint8_t *p;
00631             for (j = 0; j < height; j++)
00632                 for (i = 0; i < width; i++)
00633                     SET_PIXEL_RGB(picref, color, 255, i+x, y+j, pixel_step[0],
00634                                   rgba_map[0], rgba_map[1], rgba_map[2], rgba_map[3]);
00635         } else {
00636             unsigned int luma_pos, chroma_pos1, chroma_pos2;
00637             for (j = 0; j < height; j++)
00638                 for (i = 0; i < width; i++)
00639                     SET_PIXEL_YUV(picref, color, 255, i+x, y+j, hsub, vsub);
00640         }
00641     } else {
00642         ff_draw_rectangle(picref->data, picref->linesize,
00643                           line, pixel_step, hsub, vsub,
00644                           x, y, width, height);
00645     }
00646 }
00647 
00648 static int draw_glyphs(DrawTextContext *dtext, AVFilterBufferRef *picref,
00649                        int width, int height, const uint8_t rgbcolor[4], const uint8_t yuvcolor[4], int x, int y)
00650 {
00651     char *text = dtext->expanded_text;
00652     uint32_t code = 0;
00653     int i, x1, y1;
00654     uint8_t *p;
00655     Glyph *glyph = NULL;
00656 
00657     for (i = 0, p = text; *p; i++) {
00658         Glyph dummy = { 0 };
00659         GET_UTF8(code, *p++, continue;);
00660 
00661         /* skip new line chars, just go to new line */
00662         if (code == '\n' || code == '\r' || code == '\t')
00663             continue;
00664 
00665         dummy.code = code;
00666         glyph = av_tree_find(dtext->glyphs, &dummy, (void *)glyph_cmp, NULL);
00667 
00668         if (glyph->bitmap.pixel_mode != FT_PIXEL_MODE_MONO &&
00669             glyph->bitmap.pixel_mode != FT_PIXEL_MODE_GRAY)
00670             return AVERROR(EINVAL);
00671 
00672         x1 = dtext->positions[i].x+dtext->x+x;
00673         y1 = dtext->positions[i].y+dtext->y+y;
00674 
00675         if (dtext->is_packed_rgb) {
00676             draw_glyph_rgb(picref, &glyph->bitmap,
00677                            x1, y1, width, height,
00678                            dtext->pixel_step[0], rgbcolor, dtext->rgba_map);
00679         } else {
00680             draw_glyph_yuv(picref, &glyph->bitmap,
00681                            x1, y1, width, height,
00682                            yuvcolor, dtext->hsub, dtext->vsub);
00683         }
00684     }
00685 
00686     return 0;
00687 }
00688 
00689 static int draw_text(AVFilterContext *ctx, AVFilterBufferRef *picref,
00690                      int width, int height)
00691 {
00692     DrawTextContext *dtext = ctx->priv;
00693     uint32_t code = 0, prev_code = 0;
00694     int x = 0, y = 0, i = 0, ret;
00695     int max_text_line_w = 0, len;
00696     int box_w, box_h;
00697     char *text = dtext->text;
00698     uint8_t *p;
00699     int y_min = 32000, y_max = -32000;
00700     int x_min = 32000, x_max = -32000;
00701     FT_Vector delta;
00702     Glyph *glyph = NULL, *prev_glyph = NULL;
00703     Glyph dummy = { 0 };
00704 
00705     time_t now = time(0);
00706     struct tm ltime;
00707     uint8_t *buf = dtext->expanded_text;
00708     int buf_size = dtext->expanded_text_size;
00709 
00710     if(dtext->basetime != AV_NOPTS_VALUE)
00711         now= picref->pts*av_q2d(ctx->inputs[0]->time_base) + dtext->basetime/1000000;
00712 
00713     if (!buf) {
00714         buf_size = 2*strlen(dtext->text)+1;
00715         buf = av_malloc(buf_size);
00716     }
00717 
00718 #if HAVE_LOCALTIME_R
00719     localtime_r(&now, &ltime);
00720 #else
00721     if(strchr(dtext->text, '%'))
00722         ltime= *localtime(&now);
00723 #endif
00724 
00725     do {
00726         *buf = 1;
00727         if (strftime(buf, buf_size, dtext->text, &ltime) != 0 || *buf == 0)
00728             break;
00729         buf_size *= 2;
00730     } while ((buf = av_realloc(buf, buf_size)));
00731 
00732 #if CONFIG_AVCODEC
00733     if (dtext->tc.str) {
00734         char tcbuf[16];
00735         avpriv_timecode_to_string(tcbuf, &dtext->tc, dtext->frame_id++);
00736         buf = av_asprintf("%s%s", dtext->text, tcbuf);
00737     }
00738 #endif
00739 
00740     if (!buf)
00741         return AVERROR(ENOMEM);
00742     text = dtext->expanded_text = buf;
00743     dtext->expanded_text_size = buf_size;
00744     if ((len = strlen(text)) > dtext->nb_positions) {
00745         if (!(dtext->positions =
00746               av_realloc(dtext->positions, len*sizeof(*dtext->positions))))
00747             return AVERROR(ENOMEM);
00748         dtext->nb_positions = len;
00749     }
00750 
00751     x = 0;
00752     y = 0;
00753 
00754     /* load and cache glyphs */
00755     for (i = 0, p = text; *p; i++) {
00756         GET_UTF8(code, *p++, continue;);
00757 
00758         /* get glyph */
00759         dummy.code = code;
00760         glyph = av_tree_find(dtext->glyphs, &dummy, glyph_cmp, NULL);
00761         if (!glyph)
00762             load_glyph(ctx, &glyph, code);
00763 
00764         y_min = FFMIN(glyph->bbox.yMin, y_min);
00765         y_max = FFMAX(glyph->bbox.yMax, y_max);
00766         x_min = FFMIN(glyph->bbox.xMin, x_min);
00767         x_max = FFMAX(glyph->bbox.xMax, x_max);
00768     }
00769     dtext->max_glyph_h = y_max - y_min;
00770     dtext->max_glyph_w = x_max - x_min;
00771 
00772     /* compute and save position for each glyph */
00773     glyph = NULL;
00774     for (i = 0, p = text; *p; i++) {
00775         GET_UTF8(code, *p++, continue;);
00776 
00777         /* skip the \n in the sequence \r\n */
00778         if (prev_code == '\r' && code == '\n')
00779             continue;
00780 
00781         prev_code = code;
00782         if (is_newline(code)) {
00783             max_text_line_w = FFMAX(max_text_line_w, x);
00784             y += dtext->max_glyph_h;
00785             x = 0;
00786             continue;
00787         }
00788 
00789         /* get glyph */
00790         prev_glyph = glyph;
00791         dummy.code = code;
00792         glyph = av_tree_find(dtext->glyphs, &dummy, glyph_cmp, NULL);
00793 
00794         /* kerning */
00795         if (dtext->use_kerning && prev_glyph && glyph->code) {
00796             FT_Get_Kerning(dtext->face, prev_glyph->code, glyph->code,
00797                            ft_kerning_default, &delta);
00798             x += delta.x >> 6;
00799         }
00800 
00801         /* save position */
00802         dtext->positions[i].x = x + glyph->bitmap_left;
00803         dtext->positions[i].y = y - glyph->bitmap_top + y_max;
00804         if (code == '\t') x  = (x / dtext->tabsize + 1)*dtext->tabsize;
00805         else              x += glyph->advance;
00806     }
00807 
00808     max_text_line_w = FFMAX(x, max_text_line_w);
00809 
00810     dtext->var_values[VAR_TW] = dtext->var_values[VAR_TEXT_W] = max_text_line_w;
00811     dtext->var_values[VAR_TH] = dtext->var_values[VAR_TEXT_H] = y + dtext->max_glyph_h;
00812 
00813     dtext->var_values[VAR_MAX_GLYPH_W] = dtext->max_glyph_w;
00814     dtext->var_values[VAR_MAX_GLYPH_H] = dtext->max_glyph_h;
00815     dtext->var_values[VAR_MAX_GLYPH_A] = dtext->var_values[VAR_ASCENT ] = y_max;
00816     dtext->var_values[VAR_MAX_GLYPH_D] = dtext->var_values[VAR_DESCENT] = y_min;
00817 
00818     dtext->var_values[VAR_LINE_H] = dtext->var_values[VAR_LH] = dtext->max_glyph_h;
00819 
00820     dtext->x = dtext->var_values[VAR_X] = av_expr_eval(dtext->x_pexpr, dtext->var_values, &dtext->prng);
00821     dtext->y = dtext->var_values[VAR_Y] = av_expr_eval(dtext->y_pexpr, dtext->var_values, &dtext->prng);
00822     dtext->x = dtext->var_values[VAR_X] = av_expr_eval(dtext->x_pexpr, dtext->var_values, &dtext->prng);
00823     dtext->draw = av_expr_eval(dtext->d_pexpr, dtext->var_values, &dtext->prng);
00824 
00825     if(!dtext->draw)
00826         return 0;
00827 
00828     dtext->x &= ~((1 << dtext->hsub) - 1);
00829     dtext->y &= ~((1 << dtext->vsub) - 1);
00830 
00831     box_w = FFMIN(width - 1 , max_text_line_w);
00832     box_h = FFMIN(height - 1, y + dtext->max_glyph_h);
00833 
00834     /* draw box */
00835     if (dtext->draw_box)
00836         drawbox(picref, dtext->x, dtext->y, box_w, box_h,
00837                 dtext->box_line, dtext->pixel_step, dtext->is_packed_rgb ? dtext->boxcolor_rgba : dtext->boxcolor,
00838                 dtext->hsub, dtext->vsub, dtext->is_packed_rgb, dtext->rgba_map);
00839 
00840     if (dtext->shadowx || dtext->shadowy) {
00841         if ((ret = draw_glyphs(dtext, picref, width, height, dtext->shadowcolor_rgba,
00842                                dtext->shadowcolor, dtext->shadowx, dtext->shadowy)) < 0)
00843             return ret;
00844     }
00845 
00846     if ((ret = draw_glyphs(dtext, picref, width, height, dtext->fontcolor_rgba,
00847                            dtext->fontcolor, 0, 0)) < 0)
00848         return ret;
00849 
00850     return 0;
00851 }
00852 
00853 static void null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir) { }
00854 
00855 static void end_frame(AVFilterLink *inlink)
00856 {
00857     AVFilterContext *ctx = inlink->dst;
00858     AVFilterLink *outlink = ctx->outputs[0];
00859     DrawTextContext *dtext = ctx->priv;
00860     AVFilterBufferRef *picref = inlink->cur_buf;
00861 
00862     dtext->var_values[VAR_T] = picref->pts == AV_NOPTS_VALUE ?
00863         NAN : picref->pts * av_q2d(inlink->time_base);
00864 
00865     draw_text(ctx, picref, picref->video->w, picref->video->h);
00866 
00867     av_log(ctx, AV_LOG_DEBUG, "n:%d t:%f text_w:%d text_h:%d x:%d y:%d\n",
00868            (int)dtext->var_values[VAR_N], dtext->var_values[VAR_T],
00869            (int)dtext->var_values[VAR_TEXT_W], (int)dtext->var_values[VAR_TEXT_H],
00870            dtext->x, dtext->y);
00871 
00872     dtext->var_values[VAR_N] += 1.0;
00873 
00874     avfilter_draw_slice(outlink, 0, picref->video->h, 1);
00875     avfilter_end_frame(outlink);
00876 }
00877 
00878 AVFilter avfilter_vf_drawtext = {
00879     .name          = "drawtext",
00880     .description   = NULL_IF_CONFIG_SMALL("Draw text on top of video frames using libfreetype library."),
00881     .priv_size     = sizeof(DrawTextContext),
00882     .init          = init,
00883     .uninit        = uninit,
00884     .query_formats = query_formats,
00885 
00886     .inputs    = (const AVFilterPad[]) {{ .name       = "default",
00887                                     .type             = AVMEDIA_TYPE_VIDEO,
00888                                     .get_video_buffer = avfilter_null_get_video_buffer,
00889                                     .start_frame      = avfilter_null_start_frame,
00890                                     .draw_slice       = null_draw_slice,
00891                                     .end_frame        = end_frame,
00892                                     .config_props     = config_input,
00893                                     .min_perms        = AV_PERM_WRITE |
00894                                                         AV_PERM_READ,
00895                                     .rej_perms        = AV_PERM_PRESERVE },
00896                                   { .name = NULL}},
00897     .outputs   = (const AVFilterPad[]) {{ .name       = "default",
00898                                     .type             = AVMEDIA_TYPE_VIDEO, },
00899                                   { .name = NULL}},
00900     .process_command = command,
00901 };
Generated on Fri Feb 1 2013 14:34:49 for FFmpeg by doxygen 1.7.1