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ffmpeg/vhook/drawtext.c

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/*
* drawtext.c: print text over the screen
******************************************************************************
* Options:
* -f <filename> font filename (MANDATORY!!!)
* -s <pixel_size> font size in pixels [default 16]
* -b print background
* -o outline glyphs (use the bg color)
* -x <pos> x position ( >= 0) [default 0]
* -y <pos> y position ( >= 0) [default 0]
* -t <text> text to print (will be passed to strftime())
* MANDATORY: will be used even when -T is used.
* in this case, -t will be used if some error
* occurs
* -T <filename> file with the text (re-read every frame)
* -c <#RRGGBB> foreground color ('internet' way) [default #ffffff]
* -C <#RRGGBB> background color ('internet' way) [default #000000]
*
******************************************************************************
* Features:
* - True Type, Type1 and others via FreeType2 library
* - Font kerning (better output)
* - Line Wrap (if the text doesn't fit, the next char go to the next line)
* - Background box
* - Outline
******************************************************************************
* Author: Gustavo Sverzut Barbieri <gsbarbieri@yahoo.com.br>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#define MAXSIZE_TEXT 1024
#include "framehook.h"
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <stdarg.h>
#include <string.h>
#include <unistd.h>
#undef time
#include <sys/time.h>
#include <time.h>
#include <ft2build.h>
#include FT_FREETYPE_H
#include FT_GLYPH_H
#define RGB_TO_YUV(rgb_color, yuv_color) { \
yuv_color[0] = ( 0.257 * rgb_color[0]) + (0.504 * rgb_color[1]) + (0.098 * rgb_color[2]) + 16; \
yuv_color[2] = ( 0.439 * rgb_color[0]) - (0.368 * rgb_color[1]) - (0.071 * rgb_color[2]) + 128; \
yuv_color[1] = (-0.148 * rgb_color[0]) - (0.291 * rgb_color[1]) + (0.439 * rgb_color[2]) + 128; \
}
#define COPY_3(dst,src) { \
dst[0]=src[0]; \
dst[1]=src[1]; \
dst[2]=src[2]; \
}
#define SET_PIXEL(picture, yuv_color, x, y) { \
picture->data[0][ (x) + (y)*picture->linesize[0] ] = yuv_color[0]; \
picture->data[1][ ((x/2) + (y/2)*picture->linesize[1]) ] = yuv_color[1]; \
picture->data[2][ ((x/2) + (y/2)*picture->linesize[2]) ] = yuv_color[2]; \
}
#define GET_PIXEL(picture, yuv_color, x, y) { \
yuv_color[0] = picture->data[0][ (x) + (y)*picture->linesize[0] ]; \
yuv_color[1] = picture->data[1][ (x/2) + (y/2)*picture->linesize[1] ]; \
yuv_color[2] = picture->data[2][ (x/2) + (y/2)*picture->linesize[2] ]; \
}
typedef struct {
unsigned char *text;
unsigned char *file;
unsigned int x;
unsigned int y;
int bg;
int outline;
unsigned char bgcolor[3]; /* YUV */
unsigned char fgcolor[3]; /* YUV */
FT_Library library;
FT_Face face;
FT_Glyph glyphs[ 255 ];
FT_Bitmap bitmaps[ 255 ];
int advance[ 255 ];
int bitmap_left[ 255 ];
int bitmap_top[ 255 ];
unsigned int glyphs_index[ 255 ];
int text_height;
int baseline;
int use_kerning;
} ContextInfo;
void Release(void *ctx)
{
if (ctx)
av_free(ctx);
}
static int ParseColor(char *text, unsigned char yuv_color[3])
{
char tmp[3];
unsigned char rgb_color[3];
int i;
tmp[2] = '\0';
if ((!text) || (strlen(text) != 7) || (text[0] != '#') )
return -1;
for (i=0; i < 3; i++)
{
tmp[0] = text[i*2+1];
tmp[1] = text[i*2+2];
rgb_color[i] = strtol(tmp, NULL, 16);
}
RGB_TO_YUV(rgb_color, yuv_color);
return 0;
}
int Configure(void **ctxp, int argc, char *argv[])
{
int c;
int error;
ContextInfo *ci=NULL;
char *font=NULL;
unsigned int size=16;
FT_BBox bbox;
int yMax, yMin;
*ctxp = av_mallocz(sizeof(ContextInfo));
ci = (ContextInfo *) *ctxp;
/* configure Context Info */
ci->text = NULL;
ci->file = NULL;
ci->x = ci->y = 0;
ci->fgcolor[0]=255;
ci->fgcolor[1]=128;
ci->fgcolor[2]=128;
ci->bgcolor[0]=0;
ci->fgcolor[1]=128;
ci->fgcolor[2]=128;
ci->bg = 0;
ci->outline = 0;
ci->text_height = 0;
optind = 0;
while ((c = getopt(argc, argv, "f:t:T:x:y:s:c:C:bo")) > 0) {
switch (c) {
case 'f':
font = optarg;
break;
case 't':
ci->text = av_strdup(optarg);
break;
case 'T':
ci->file = av_strdup(optarg);
break;
case 'x':
ci->x = (unsigned int) atoi(optarg);
break;
case 'y':
ci->y = (unsigned int) atoi(optarg);
break;
case 's':
size = (unsigned int) atoi(optarg);
break;
case 'c':
if (ParseColor(optarg, ci->fgcolor) == -1)
{
fprintf(stderr, "ERROR: Invalid foreground color: '%s'. You must specify the color in the internet way(packaged hex): #RRGGBB, ie: -c #ffffff (for white foreground)\n",optarg);
return -1;
}
break;
case 'C':
if (ParseColor(optarg, ci->bgcolor) == -1)
{
fprintf(stderr, "ERROR: Invalid foreground color: '%s'. You must specify the color in the internet way(packaged hex): #RRGGBB, ie: -c #ffffff (for white foreground)\n",optarg);
return -1;
}
break;
case 'b':
ci->bg=1;
break;
case 'o':
ci->outline=1;
break;
case '?':
fprintf(stderr, "ERROR: Unrecognized argument '%s'\n", argv[optind]);
return -1;
}
}
if (!ci->text)
{
fprintf(stderr,"ERROR: No text provided (-t text)\n");
return -1;
}
if (ci->file)
{
FILE *fp;
if ((fp=fopen(ci->file, "r")) == NULL)
{
perror("WARNING: the file could not be opened. Using text provided with -t switch. ");
}
else
{
fclose(fp);
}
}
if (!font)
{
fprintf(stderr,"ERROR: No font file provided! (-f filename)\n");
return -1;
}
if ((error = FT_Init_FreeType(&(ci->library))) != 0)
{
fprintf(stderr,"ERROR: Could not load FreeType (error# %d)\n",error);
return -1;
}
if ((error = FT_New_Face( ci->library, font, 0, &(ci->face) )) != 0)
{
fprintf(stderr,"ERROR: Could not load face: %s (error# %d)\n",font, error);
return -1;
}
if ((error = FT_Set_Pixel_Sizes( ci->face, 0, size)) != 0)
{
fprintf(stderr,"ERROR: Could not set font size to %d pixels (error# %d)\n",size, error);
return -1;
}
ci->use_kerning = FT_HAS_KERNING(ci->face);
/* load and cache glyphs */
yMax = -32000;
yMin = 32000;
for (c=0; c < 256; c++)
{
/* Load char */
error = FT_Load_Char( ci->face, (unsigned char) c, FT_LOAD_RENDER | FT_LOAD_MONOCHROME );
if (error) continue; /* ignore errors */
/* Save bitmap */
ci->bitmaps[c] = ci->face->glyph->bitmap;
/* Save bitmap left */
ci->bitmap_left[c] = ci->face->glyph->bitmap_left;
/* Save bitmap top */
ci->bitmap_top[c] = ci->face->glyph->bitmap_top;
/* Save advance */
ci->advance[c] = ci->face->glyph->advance.x >> 6;
/* Save glyph */
error = FT_Get_Glyph( ci->face->glyph, &(ci->glyphs[c]) );
/* Save glyph index */
ci->glyphs_index[c] = FT_Get_Char_Index( ci->face, (unsigned char) c );
/* Measure text height to calculate text_height (or the maximum text height) */
FT_Glyph_Get_CBox( ci->glyphs[ c ], ft_glyph_bbox_pixels, &bbox );
if (bbox.yMax > yMax)
yMax = bbox.yMax;
if (bbox.yMin < yMin)
yMin = bbox.yMin;
}
ci->text_height = yMax - yMin;
ci->baseline = yMax;
return 0;
}
static inline void draw_glyph(AVPicture *picture, FT_Bitmap *bitmap, unsigned int x, unsigned int y, unsigned int width, unsigned int height, unsigned char yuv_fgcolor[3], unsigned char yuv_bgcolor[3], int outline)
{
int r, c;
int spixel, dpixel[3], in_glyph=0;
if (bitmap->pixel_mode == ft_pixel_mode_mono)
{
in_glyph = 0;
for (r=0; (r < bitmap->rows) && (r+y < height); r++)
{
for (c=0; (c < bitmap->width) && (c+x < width); c++)
{
/* pixel in the picture (destination) */
GET_PIXEL(picture, dpixel, (c+x), (y+r));
/* pixel in the glyph bitmap (source) */
spixel = bitmap->buffer[r*bitmap->pitch +c/8] & (0x80>>(c%8));
if (spixel)
COPY_3(dpixel, yuv_fgcolor);
if (outline)
{
/* border detection: */
if ( (!in_glyph) && (spixel) )
/* left border detected */
{
in_glyph = 1;
/* draw left pixel border */
if (c-1 >= 0)
SET_PIXEL(picture, yuv_bgcolor, (c+x-1), (y+r));
}
else if ( (in_glyph) && (!spixel) )
/* right border detected */
{
in_glyph = 0;
/* 'draw' right pixel border */
COPY_3(dpixel, yuv_bgcolor);
}
if (in_glyph)
/* see if we have a top/bottom border */
{
/* top */
if ( (r-1 >= 0) && (! bitmap->buffer[(r-1)*bitmap->pitch +c/8] & (0x80>>(c%8))) )
/* we have a top border */
SET_PIXEL(picture, yuv_bgcolor, (c+x), (y+r-1));
/* bottom */
if ( (r+1 < height) && (! bitmap->buffer[(r+1)*bitmap->pitch +c/8] & (0x80>>(c%8))) )
/* we have a bottom border */
SET_PIXEL(picture, yuv_bgcolor, (c+x), (y+r+1));
}
}
SET_PIXEL(picture, dpixel, (c+x), (y+r));
}
}
}
}
static inline void draw_box(AVPicture *picture, unsigned int x, unsigned int y, unsigned int width, unsigned int height, unsigned char yuv_color[3])
{
int i, j;
for (j = 0; (j < height); j++)
for (i = 0; (i < width); i++)
{
SET_PIXEL(picture, yuv_color, (i+x), (y+j));
}
}
void Process(void *ctx, AVPicture *picture, enum PixelFormat pix_fmt, int width, int height, int64_t pts)
{
ContextInfo *ci = (ContextInfo *) ctx;
FT_Face face = ci->face;
FT_GlyphSlot slot = face->glyph;
unsigned char *text = ci->text;
unsigned char c;
int x = 0, y = 0, i=0, size=0;
unsigned char buff[MAXSIZE_TEXT];
unsigned char tbuff[MAXSIZE_TEXT];
time_t now = time(0);
int str_w, str_w_max;
FT_Vector pos[MAXSIZE_TEXT];
FT_Vector delta;
if (ci->file)
{
int fd = open(ci->file, O_RDONLY);
if (fd < 0)
{
text = ci->text;
perror("WARNING: the file could not be opened. Using text provided with -t switch. ");
}
else
{
int l = read(fd, tbuff, sizeof(tbuff) - 1);
if (l >= 0)
{
tbuff[l] = 0;
text = tbuff;
}
else
{
text = ci->text;
perror("WARNING: the file could not be opened. Using text provided with -t switch. ");
}
close(fd);
}
}
else
{
text = ci->text;
}
strftime(buff, sizeof(buff), text, localtime(&now));
text = buff;
size = strlen(text);
/* measure string size and save glyphs position*/
str_w = str_w_max = 0;
x = ci->x;
y = ci->y;
for (i=0; i < size; i++)
{
c = text[i];
/* kerning */
if ( (ci->use_kerning) && (i > 0) && (ci->glyphs_index[c]) )
{
FT_Get_Kerning( ci->face,
ci->glyphs_index[ text[i-1] ],
ci->glyphs_index[c],
ft_kerning_default,
&delta );
x += delta.x >> 6;
}
if (( (x + ci->advance[ c ]) >= width ) || ( c == '\n' ))
{
str_w = width - ci->x - 1;
y += ci->text_height;
x = ci->x;
}
/* save position */
pos[i].x = x + ci->bitmap_left[c];
pos[i].y = y - ci->bitmap_top[c] + ci->baseline;
x += ci->advance[c];
if (str_w > str_w_max)
str_w_max = str_w;
}
if (ci->bg)
{
/* Check if it doesn't pass the limits */
if ( str_w_max + ci->x >= width )
str_w_max = width - ci->x - 1;
if ( y >= height )
y = height - 1 - 2*ci->y;
/* Draw Background */
draw_box( picture, ci->x, ci->y, str_w_max, y - ci->y, ci->bgcolor );
}
/* Draw Glyphs */
for (i=0; i < size; i++)
{
c = text[i];
if (
( (c == '_') && (text == ci->text) ) || /* skip '_' (consider as space)
IF text was specified in cmd line
(which doesn't like neasted quotes) */
( c == '\n' ) /* Skip new line char, just go to new line */
)
continue;
/* now, draw to our target surface */
draw_glyph( picture,
&(ci->bitmaps[ c ]),
pos[i].x,
pos[i].y,
width,
height,
ci->fgcolor,
ci->bgcolor,
ci->outline );
/* increment pen position */
x += slot->advance.x >> 6;
}
}
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