On 04/08/2010 10:52 AM, Stefano Sabatini wrote:
On date Thursday 2010-04-08 08:05:02 -0700, S.N. Hemanth Meenakshisundaram
encoded:
[...]
The vf_drawtext filter is almost done but I am having problems
linking in the freetype libraries. I attempted the attached changes
to the ffmpeg Makefile but I see the following error :
ffmpeg/libavfilter/libavfilter.a(vf_drawtext.o): In function `draw_text':
ffmpeg/libavfilter/vf_drawtext.c:422: undefined reference to
`FT_Get_Kerning'
What am I doing wrong?
Thanks
Index: Makefile
===================================================================
--- Makefile (revision 22749)
+++ Makefile (working copy)
@@ -71,6 +71,9 @@
$(foreach D,$(FFLIBS),$(eval $(call DOSUBDIR,lib$(D))))
+libavfilter/vf_drawtext.o libavfilter/vf_drawtext.d: CFLAGS +=
$(`freetype-config --cflags`)
+FF_EXTRALIBS += $(`freetype-config --libs`)
+
ffplay_g$(EXESUF): FF_EXTRALIBS += $(SDL_LIBS)
ffserver_g$(EXESUF): FF_LDFLAGS += $(FFSERVERLDFLAGS)
I believe the right syntax is: $(shell freetype-config --cflags)
anyway this is not the right way to do it, in configure add something
of the kind:
enabled drawtext_filter&& check_lib2 freetype2/freetype.h freetype_init
-lfreetype
...
drawtext_filter_deps="freetype2_freetype_h"
drawtext_filter_extralibs="-lfreetype"
(maybe the last line is not strictly necessary.)
Hi,
Attached is drawtext.diff which contains the libavfilter folder Makefile
change, allfilters.c change and vf_drawtext.c
I removed the Makefile changes and added what you suggested above into
the configure script (as in configure.diff).
config.err still showed some errors initially and after tweaking it a
little, the errors stopped. (My headers are in /usr/include/freetype).
Now it shows :
check_header ft2build.h
...
BEGIN /tmp/ffconf.OwX6Cozb.c
1 #include <ft2build.h>
2 int x;
END /tmp/ffconf.OwX6Cozb.c
..
check_lib2 FT_FREETYPE_H FT_Init_FreeType -lfreetype
check_func_headers FT_FREETYPE_H FT_Init_FreeType -lfreetype
check_ld -lfreetype
Is this right?
Am seeing two problems :
1. Whenever configure is run, it generates config.mak with
!CONFIG_DRAWTEXT_FILTER=yes
and config.h with
#define CONFIG_DRAWTEXT_FILTER 0
I have to manually change before it attempts to build vf_drawtext
2.
I still see the 'undefined reference to...' linker errors for the
freetype calls :(
Can you give me some pointers on what could be wrong. For the 1st
problem, I tried looking for any other places a new filter needs to be
registered/included and couldn't find any. For the 2nd,
I am a newbie to configure scripts, so can you please explain what the
configure script lines actually mean.
Thanks,
Index: allfilters.c
===================================================================
--- allfilters.c (revision 5734)
+++ allfilters.c (working copy)
@@ -54,6 +54,7 @@
REGISTER_FILTER (SPLIT, split, vf);
REGISTER_FILTER (TRANSPOSE, transpose, vf);
REGISTER_FILTER (VFLIP, vflip, vf);
+ REGISTER_FILTER (DRAWTEXT, drawtext, vf);
REGISTER_FILTER (BUFFER, buffer, vsrc);
REGISTER_FILTER (MOVIE, movie, vsrc);
Index: Makefile
===================================================================
--- Makefile (revision 5734)
+++ Makefile (working copy)
@@ -35,6 +35,7 @@
OBJS-$(CONFIG_SPLIT_FILTER) += vf_split.o
OBJS-$(CONFIG_TRANSPOSE_FILTER) += vf_transpose.o
OBJS-$(CONFIG_VFLIP_FILTER) += vf_vflip.o
+OBJS-$(CONFIG_DRAWTEXT_FILTER) += vf_drawtext.o
OBJS-$(CONFIG_BUFFER_FILTER) += vsrc_buffer.o
OBJS-$(CONFIG_MOVIE_FILTER) += vsrc_movie.o
Index: vf_drawtext.c
===================================================================
--- vf_drawtext.c (revision 0)
+++ vf_drawtext.c (revision 0)
@@ -0,0 +1,578 @@
+/*
+ * vf_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
+ ******************************************************************************
+ * Original vhook author: Gustavo Sverzut Barbieri <[email protected]>
+ * Libavfilter version : S.N. Hemanth Meenakshisundaram <[email protected]>
+ *
+ * Example usage :
+ * ffmpeg -i input.avi -vfilters \
+ * 'drawtext=f:Vera.ttf:t:Test Text:x:5:y:5:s:20' output.avi
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg 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 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg 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 FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file libavfilter/vf_drawtext.c
+ * video filter to draw text over screen
+ */
+
+#define MAXSIZE_TEXT 1024
+
+#include "avfilter.h"
+#include "libavutil/pixdesc.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 <freetype/config/ftheader.h>
+#include FT_FREETYPE_H
+#include FT_GLYPH_H
+
+#define SCALEBITS 10
+#define DEF_DRAWTEXT_FONT_SZ 16
+#define MAX_DRAWTEXT_OPT 10
+#define ONE_HALF (1 << (SCALEBITS - 1))
+#define FIX(x) ((int) ((x) * (1<<SCALEBITS) + 0.5))
+
+#define RGB_TO_YUV(rgb_color, yuv_color) do { \
+ yuv_color[0] = (FIX(0.29900) * rgb_color[0] + FIX(0.58700) * rgb_color[1]
+ FIX(0.11400) * rgb_color[2] + ONE_HALF) >> SCALEBITS; \
+ yuv_color[2] = ((FIX(0.50000) * rgb_color[0] - FIX(0.41869) * rgb_color[1]
- FIX(0.08131) * rgb_color[2] + ONE_HALF - 1) >> SCALEBITS) + 128; \
+ yuv_color[1] = ((- FIX(0.16874) * rgb_color[0] - FIX(0.33126) * rgb_color[1]
+ FIX(0.50000) * rgb_color[2] + ONE_HALF - 1) >> SCALEBITS) + 128; \
+} while (0)
+
+#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;
+ 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;
+} DtextContext;
+
+static int query_formats(AVFilterContext *ctx)
+{
+ static const enum PixelFormat pix_fmts[] = {
+ PIX_FMT_RGB48BE, PIX_FMT_RGB48LE,
+ PIX_FMT_ARGB, PIX_FMT_RGBA,
+ PIX_FMT_ABGR, PIX_FMT_BGRA,
+ PIX_FMT_RGB24, PIX_FMT_BGR24,
+ PIX_FMT_RGB565BE, PIX_FMT_RGB565LE,
+ PIX_FMT_RGB555BE, PIX_FMT_RGB555LE,
+ PIX_FMT_BGR565BE, PIX_FMT_BGR565LE,
+ PIX_FMT_BGR555BE, PIX_FMT_BGR555LE,
+ PIX_FMT_GRAY16BE, PIX_FMT_GRAY16LE,
+ PIX_FMT_YUV420P16LE, PIX_FMT_YUV420P16BE,
+ PIX_FMT_YUV422P16LE, PIX_FMT_YUV422P16BE,
+ PIX_FMT_YUV444P16LE, PIX_FMT_YUV444P16BE,
+ PIX_FMT_YUV444P, PIX_FMT_YUV422P,
+ PIX_FMT_YUV420P, PIX_FMT_YUV411P,
+ PIX_FMT_YUV410P, PIX_FMT_YUV440P,
+ PIX_FMT_YUVJ444P, PIX_FMT_YUVJ422P,
+ PIX_FMT_YUVJ420P, PIX_FMT_YUVJ440P,
+ PIX_FMT_YUVA420P,
+ PIX_FMT_RGB8, PIX_FMT_BGR8,
+ PIX_FMT_RGB4_BYTE, PIX_FMT_BGR4_BYTE,
+ PIX_FMT_PAL8, PIX_FMT_GRAY8,
+ PIX_FMT_NONE
+ };
+
+ avfilter_set_common_formats(ctx, avfilter_make_format_list(pix_fmts));
+
+ return 0;
+}
+
+static int parse_color(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;
+}
+
+static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
+{
+ int err, chars_read, num_opt = 0;
+ char str[256], cmd[2];
+ const char *args_cur;
+ int c;
+ char *font=NULL;
+ unsigned int size=DEF_DRAWTEXT_FONT_SZ;
+ FT_BBox bbox;
+ int yMax, yMin;
+ DtextContext *dtext = ctx->priv;
+
+ dtext->text = NULL;
+ dtext->file = NULL;
+ dtext->x = dtext->y = 0;
+ dtext->fgcolor[0]=255;
+ dtext->fgcolor[1]=128;
+ dtext->fgcolor[2]=128;
+ dtext->bgcolor[0]=0;
+ dtext->fgcolor[1]=128;
+ dtext->fgcolor[2]=128;
+ dtext->bg = 0;
+ dtext->outline = 0;
+ dtext->text_height = 0;
+
+ optind = 1;
+
+ if ((err = FT_Init_FreeType(&(dtext->library))) != 0)
+ {
+ av_log(NULL, AV_LOG_ERROR, "Could not load FreeType (error# %d).\n",
err);
+ return -1;
+ }
+
+ args_cur = args;
+ if(args_cur) {
+ while (2 == sscanf(args_cur, "%1[FtfxyiRGBA]:%255[^:]%n", cmd, str,
&chars_read))
+ {
+ if (num_opt>=MAX_DRAWTEXT_OPT) {
+ av_log(NULL, AV_LOG_ERROR,
+ "drawtext init() cannot handle more than %d arguments\n",
+ MAX_DRAWTEXT_OPT);
+ return -1;
+ }
+ switch(cmd[0]) {
+ case 'f':
+ font = av_strdup(str);
+ break;
+ case 't':
+ dtext->text = av_strdup(str);
+ break;
+ case 'T':
+ dtext->file = av_strdup(str);
+ break;
+ case 'x':
+ dtext->x = (unsigned int)atoi(str);
+ break;
+ case 'y':
+ dtext->y = (unsigned int)atoi(str);
+ break;
+ case 's':
+ size = (unsigned int)atoi(str);
+ break;
+ case 'c':
+ if (parse_color(optarg, dtext->fgcolor) == -1)
+ {
+ av_log(NULL, AV_LOG_ERROR, "Invalid foreground color:
'%s'.\n", optarg);
+ return -1;
+ }
+ break;
+ case 'C':
+ if (parse_color(optarg, dtext->bgcolor) == -1)
+ {
+ av_log(NULL, AV_LOG_ERROR, "Invalid background color:
'%s'.\n", optarg);
+ return -1;
+ }
+ break;
+ case 'b':
+ dtext->bg = 1;
+ break;
+ case 'o':
+ dtext->bg = 1;
+ break;
+ case '?':
+ av_log(NULL, AV_LOG_ERROR, "Unrecognized argument '%c:%s'\n",
cmd[0], str);
+ return -1;
+ }
+ num_opt++;
+ args_cur += chars_read;
+ if (*args_cur==':')
+ args_cur++;
+ }
+ }
+ if (*font == 0)
+ {
+ av_log(NULL, AV_LOG_ERROR, "No font file provided! (-f filename)\n");
+ return -1;
+ }
+ if ((err = FT_New_Face( dtext->library, font, 0, &(dtext->face) )) != 0)
+ {
+ av_log(NULL, AV_LOG_ERROR, "Could not load face: %s (error# %d).\n",
font, err);
+ return -1;
+ }
+ if (!dtext->text || *(dtext->text) == 0)
+ {
+ av_log(NULL, AV_LOG_ERROR, "No text provided (-t text)\n");
+ return -1;
+ }
+ if (dtext->file && *(dtext->file) != 0)
+ {
+ FILE *fp;
+ if ((fp=fopen(dtext->file, "r")) == NULL)
+ {
+ av_log(NULL, AV_LOG_INFO, "WARNING: The file could not be opened.\
+ Using text provided with -t switch: %s",
strerror(errno));
+ }
+ else
+ {
+ fclose(fp);
+ }
+ }
+ if ((err = FT_Set_Pixel_Sizes( dtext->face, 0, size)) != 0)
+ {
+ av_log(NULL, AV_LOG_ERROR, "Could not set font size to %d pixels
(error# %d).\n", size, err);
+ return -1;
+ }
+
+ dtext->use_kerning = FT_HAS_KERNING(dtext->face);
+
+ /* load and cache glyphs */
+ yMax = -32000;
+ yMin = 32000;
+ for (c=0; c < 256; c++)
+ {
+ /* Load char */
+ err = FT_Load_Char( dtext->face, (unsigned char) c, FT_LOAD_RENDER |
FT_LOAD_MONOCHROME );
+ if (err) continue; /* ignore errors */
+
+ /* Save bitmap */
+ dtext->bitmaps[c] = dtext->face->glyph->bitmap;
+ /* Save bitmap left */
+ dtext->bitmap_left[c] = dtext->face->glyph->bitmap_left;
+ /* Save bitmap top */
+ dtext->bitmap_top[c] = dtext->face->glyph->bitmap_top;
+
+ /* Save advance */
+ dtext->advance[c] = dtext->face->glyph->advance.x >> 6;
+
+ /* Save glyph */
+ err = FT_Get_Glyph( dtext->face->glyph, &(dtext->glyphs[c]) );
+ /* Save glyph index */
+ dtext->glyphs_index[c] = FT_Get_Char_Index( dtext->face, (unsigned
char) c );
+
+ /* Measure text height to calculate text_height (or the maximum text
height) */
+ FT_Glyph_Get_CBox( dtext->glyphs[ c ], ft_glyph_bbox_pixels, &bbox );
+ if (bbox.yMax > yMax)
+ yMax = bbox.yMax;
+ if (bbox.yMin < yMin)
+ yMin = bbox.yMin;
+ }
+
+ dtext->text_height = yMax - yMin;
+ dtext->baseline = yMax;
+
+ return 0;
+}
+
+static int config_input(AVFilterLink *link)
+{
+ 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));
+ }
+}
+
+static void draw_text(DtextContext *dtext, AVPicture *picture, int width, int
height)
+{
+ FT_Face face = dtext->face;
+ FT_GlyphSlot slot = face->glyph;
+ unsigned char *text = dtext->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 (dtext->file)
+ {
+ int fd = open(dtext->file, O_RDONLY);
+ if (fd < 0)
+ {
+ text = dtext->text;
+ av_log(NULL, AV_LOG_INFO, "WARNING: The file could not be opened.\
+ Using text provided with -t switch: %s", strerror(errno));
+ }
+ else
+ {
+ int l = read(fd, tbuff, sizeof(tbuff) - 1);
+ if (l >= 0)
+ {
+ tbuff[l] = 0;
+ text = tbuff;
+ }
+ else
+ {
+ text = dtext->text;
+ av_log(NULL, AV_LOG_INFO, "WARNING: The file could not be
read.\
+ Using text provided with -t switch: %s",
strerror(errno));
+ }
+ close(fd);
+ }
+ }
+ else
+ {
+ text = dtext->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 = dtext->x;
+ y = dtext->y;
+ for (i=0; i < size; i++)
+ {
+ c = text[i];
+ /* kerning */
+ if ( (dtext->use_kerning) && (i > 0) && (dtext->glyphs_index[c]) )
+ {
+ FT_Get_Kerning(dtext->face, dtext->glyphs_index[text[i-1]],
+ dtext->glyphs_index[c], ft_kerning_default, &delta);
+ x += delta.x >> 6;
+ }
+
+ if (( (x + dtext->advance[ c ]) >= width ) || ( c == '\n' ))
+ {
+ str_w = width - dtext->x - 1;
+ y += dtext->text_height;
+ x = dtext->x;
+ }
+
+ /* save position */
+ pos[i].x = x + dtext->bitmap_left[c];
+ pos[i].y = y - dtext->bitmap_top[c] + dtext->baseline;
+ x += dtext->advance[c];
+ if (str_w > str_w_max)
+ str_w_max = str_w;
+ }
+ if (dtext->bg)
+ {
+ /* Check if it doesn't pass the limits */
+ if ( str_w_max + dtext->x >= width )
+ str_w_max = width - dtext->x - 1;
+ if ( y >= height )
+ y = height - 1 - 2*dtext->y;
+
+ /* Draw Background */
+ draw_box( picture, dtext->x, dtext->y, str_w_max, y - dtext->y,
dtext->bgcolor );
+ }
+
+ /* Draw Glyphs */
+ for (i=0; i < size; i++)
+ {
+ c = text[i];
+
+ /* skip '_' (consider as space) if text was specified in cmd line and
+ * skip new line char, just go to new line */
+ if (( (c == '_') && (text == dtext->text) ) || ( c == '\n' ) )
+ continue;
+
+ /* now, draw to our target surface */
+ draw_glyph( picture,
+ &(dtext->bitmaps[ c ]),
+ pos[i].x,
+ pos[i].y,
+ width,
+ height,
+ dtext->fgcolor,
+ dtext->bgcolor,
+ dtext->outline );
+
+ /* increment pen position */
+ x += slot->advance.x >> 6;
+ }
+}
+
+static void end_frame(AVFilterLink *link)
+{
+ DtextContext *context = link->dst->priv;
+ AVFilterLink *output = link->dst->outputs[0];
+ AVFilterPicRef *pic_ref = link->cur_pic;
+ AVPicture *pic = (AVPicture *)&pic_ref->data;
+
+ draw_text(context, pic, pic_ref->w, pic_ref->h);
+
+ avfilter_draw_slice(output, 0, pic_ref->h, 1);
+ avfilter_end_frame(output);
+}
+
+AVFilter avfilter_vf_drawtext = {
+ .name = "drawtext",
+ .priv_size = sizeof(DtextContext),
+ .init = init,
+
+ .query_formats = query_formats,
+ .inputs = (AVFilterPad[]) {{ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .get_video_buffer=
avfilter_null_get_video_buffer,
+ .start_frame =
avfilter_null_start_frame,
+ .end_frame = end_frame,
+ .config_props = config_input,
+ .min_perms = AV_PERM_WRITE |
+ AV_PERM_READ,
+ .rej_perms = AV_PERM_PRESERVE },
+ { .name = NULL}},
+ .outputs = (AVFilterPad[]) {{ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO, },
+ { .name = NULL}},
+};
Index: configure
===================================================================
--- configure (revision 22749)
+++ configure (working copy)
@@ -2695,6 +2695,12 @@
check_header sys/soundcard.h
check_header soundcard.h
+drawtext_filter_deps="freetype_freetype_h"
+drawtext_filter_extralibs="-lfreetype"
+
+check_header ft2build.h
+enabled drawtext_filter && check_lib2 FT_FREETYPE_H FT_Init_FreeType -lfreetype
+
enabled_any alsa_indev alsa_outdev && check_lib2 alsa/asoundlib.h
snd_pcm_htimestamp -lasound
enabled jack_indev && check_lib2 jack/jack.h jack_client_open -ljack
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