--- /dev/null
+/*
+ * drawtext.c: print text over the screen
+ ******************************************************************
+ * Options:
+ * -f <filename> font filename
+ * -s <pixel_size> font size in pixels
+ * -b print background
+ * -o outline glyphs (use the bg color)
+ * -x <pos> x position ( > 0)
+ * -y <pos> y position ( > 0)
+ * -t <text> text to print (will be passed to strftime())
+ * -c <#RRGGBB> foreground color ('internet' way)
+ * -C <#RRGGBB> background color ('internet' way)
+ *
+ ******************************************************************
+ *
+ * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <fcntl.h>
+#include <stdarg.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/time.h>
+#include <time.h>
+
+#include "framehook.h"
+
+#include <ft2build.h>
+#include FT_FREETYPE_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 {
+ char *text;
+ unsigned int x;
+ unsigned int y;
+ int bg;
+ int outline;
+ unsigned char bgcolor[3]; /* YUV */
+ unsigned char fgcolor[3]; /* YUV */
+ FT_Library ft_lib;
+ FT_Face ft_face;
+} ContextInfo;
+
+
+void Release(void *ctx)
+{
+ if (ctx)
+ av_free(ctx);
+}
+
+
+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);
+
+ printf("RGB=%d,%d,%d YUV=%d,%d,%d\n",rgb_color[0],rgb_color[1],rgb_color[2],
+ yuv_color[0],yuv_color[1],yuv_color[2]);
+ return 0;
+}
+
+int Configure(void **ctxp, int argc, char *argv[])
+{
+ int c;
+ int error;
+ ContextInfo *ci=NULL;
+ char *font=NULL;
+ unsigned int size=16;
+
+ *ctxp = av_mallocz(sizeof(ContextInfo));
+ ci = (ContextInfo *) *ctxp;
+
+ /* configure Context Info */
+ ci->text = 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;
+
+ optind = 0;
+ while ((c = getopt(argc, argv, "f:t:x:y:s:c:C:bo")) > 0) {
+ switch (c) {
+ case 'f':
+ font = optarg;
+ break;
+ case 't':
+ ci->text = 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 (!font)
+ {
+ fprintf(stderr,"ERROR: No font file provided! (-f filename)\n");
+ return -1;
+ }
+
+ if ((error = FT_Init_FreeType(&(ci->ft_lib))) != 0)
+ {
+ fprintf(stderr,"ERROR: Could not load FreeType (error# %d)\n",error);
+ return -1;
+ }
+
+ if ((error = FT_New_Face( ci->ft_lib, font, 0, &(ci->ft_face) )) != 0)
+ {
+ fprintf(stderr,"ERROR: Could not load face: %s (error# %d)\n",font, error);
+ return -1;
+ }
+
+ if ((error = FT_Set_Pixel_Sizes( ci->ft_face, 0, size)) != 0)
+ {
+ fprintf(stderr,"ERROR: Could not set font size to %d pixels (error# %d)\n",size, error);
+ return -1;
+ }
+
+ return 0;
+}
+
+
+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);
+ }
+ else 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));
+ }
+ }
+ }
+}
+
+
+void Process(void *ctx, AVPicture *picture, enum PixelFormat pix_fmt, int width, int height, INT64 pts)
+{
+ ContextInfo *ci = (ContextInfo *) ctx;
+ FT_Face face = ci->ft_face;
+ FT_GlyphSlot slot = face->glyph;
+ char *text = ci->text;
+ int x = 0, y = 0, i=0, j=0, size=0, error;
+ int str_w, str_h;
+ char buff[1000];
+ time_t now = time(0);
+
+ strftime(buff, sizeof(buff), text, localtime(&now));
+
+ text = buff;
+
+ size = strlen(text);
+
+ x = ci->x;
+ y = ci->y;
+
+
+ /* measure string size */
+ str_w = str_h = 0;
+ for (i=0; i < size; i++)
+ {
+ /* load glyph image into the slot (erase previous one) */
+ error = FT_Load_Char( face, text[i], FT_LOAD_RENDER | FT_LOAD_MONOCHROME );
+ if (error) continue; /* ignore errors */
+
+ str_w += slot->advance.x >> 6;
+
+ if (slot->bitmap_top > str_h)
+ str_h = slot->bitmap_top;
+
+ }
+
+
+ if (ci->bg)
+ /* draw background */
+ for (j = 0; (j < str_h) && (j+y < height); j++)
+ for (i = 0; (i < str_w) && (i+x < width); i++)
+ {
+ SET_PIXEL(picture, ci->bgcolor, (i+x), (y+j));
+ }
+
+ /* Draw Glyphs */
+ for (i=0; i < size; i++)
+ {
+ /* load glyph image into the slot (erase previous one) */
+ error = FT_Load_Char( face, text[i], FT_LOAD_RENDER | FT_LOAD_MONOCHROME );
+ if (error) continue; /* ignore errors */
+
+ if (text[i] != '_') /* skip '_' (consider as space) */
+ /* now, draw to our target surface */
+
+ draw_glyph( picture, &slot->bitmap,
+ x + slot->bitmap_left,
+ y - slot->bitmap_top + str_h,
+ width, height,
+ ci->fgcolor, ci->bgcolor,
+ ci->outline);
+
+ /* increment pen position */
+ x += slot->advance.x >> 6;
+ }
+
+
+}
+
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