libavfilter/vf_drawtext.c File Reference

drawtext filter, based on the original FFmpeg vhook/drawtext.c filter by Gustavo Sverzut Barbieri More...

#include <sys/time.h>
#include <time.h>
#include "libavutil/colorspace.h"
#include "libavutil/file.h"
#include "libavutil/opt.h"
#include "libavutil/parseutils.h"
#include "libavutil/pixdesc.h"
#include "libavutil/tree.h"
#include "avfilter.h"
#include "drawutils.h"
#include <ft2build.h>
#include <freetype/config/ftheader.h>
#include <FT_FREETYPE_H>
#include <FT_GLYPH_H>
#include <FT_ERRORS_H>

Go to the source code of this file.

Data Structures

struct  DrawTextContext
struct  ft_error

Defines

#define OFFSET(x)   offsetof(DrawTextContext, x)
#define FT_ERROR_START_LIST   {
#define FT_ERRORDEF(e, v, s)   { (e), (s) },
#define FT_ERROR_END_LIST   { 0, NULL } };
#define FT_ERRMSG(e)   ft_errors[e].err_msg
#define GET_BITMAP_VAL(r, c)
#define SET_PIXEL_YUV(picref, yuva_color, val, x, y, hsub, vsub)
#define SET_PIXEL_RGB(picref, rgba_color, val, x, y, pixel_step, r_off, g_off, b_off, a_off)

Functions

static const char * drawtext_get_name (void *ctx)
static int glyph_cmp (void *key, const void *b)
static int load_glyph (AVFilterContext *ctx, Glyph **glyph_ptr, uint32_t code)
 Load glyphs corresponding to the UTF-32 codepoint code.
static av_cold int init (AVFilterContext *ctx, const char *args, void *opaque)
static int query_formats (AVFilterContext *ctx)
static int glyph_enu_free (void *opaque, void *elem)
static av_cold void uninit (AVFilterContext *ctx)
static int config_input (AVFilterLink *inlink)
static int draw_glyph_yuv (AVFilterBufferRef *picref, FT_Bitmap *bitmap, unsigned int x, unsigned int y, unsigned int width, unsigned int height, const uint8_t yuva_color[4], int hsub, int vsub)
static int draw_glyph_rgb (AVFilterBufferRef *picref, FT_Bitmap *bitmap, unsigned int x, unsigned int y, unsigned int width, unsigned int height, int pixel_step, const uint8_t rgba_color[4], const uint8_t rgba_map[4])
static void drawbox (AVFilterBufferRef *picref, unsigned int x, unsigned int y, unsigned int width, unsigned int height, uint8_t *line[4], int pixel_step[4], uint8_t color[4], int hsub, int vsub, int is_rgba_packed, uint8_t rgba_map[4])
static int is_newline (uint32_t c)
static int draw_glyphs (DrawTextContext *dtext, AVFilterBufferRef *picref, int width, int height, const uint8_t rgbcolor[4], const uint8_t yuvcolor[4], int x, int y)
static int draw_text (AVFilterContext *ctx, AVFilterBufferRef *picref, int width, int height)
static void null_draw_slice (AVFilterLink *link, int y, int h, int slice_dir)
static void end_frame (AVFilterLink *inlink)

Variables

static const AVOption drawtext_options []
static const AVClass drawtext_class
struct ft_error ft_errors []
AVFilter avfilter_vf_drawtext

Detailed Description

drawtext filter, based on the original FFmpeg vhook/drawtext.c filter by Gustavo Sverzut Barbieri

Definition in file vf_drawtext.c.

Define Documentation

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

Referenced by init().

#define FT_ERROR_END_LIST   { 0, NULL } };

Definition at line 137 of file vf_drawtext.c.

#define FT_ERROR_START_LIST   {

Definition at line 135 of file vf_drawtext.c.

#define FT_ERRORDEF ( e,
v,
s   )     { (e), (s) },

Definition at line 136 of file vf_drawtext.c.

#define GET_BITMAP_VAL ( r,
c   ) 

Value:

bitmap->pixel_mode == FT_PIXEL_MODE_MONO ?                          \
        (bitmap->buffer[(r) * bitmap->pitch + ((c)>>3)] & (0x80 >> ((c)&7))) * 255 : \
         bitmap->buffer[(r) * bitmap->pitch +  (c)]

Definition at line 404 of file vf_drawtext.c.

Referenced by draw_glyph_rgb(), and draw_glyph_yuv().

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

Definition at line 86 of file vf_drawtext.c.

#define SET_PIXEL_RGB ( picref,
rgba_color,
val,
x,
y,
pixel_step,
r_off,
g_off,
b_off,
a_off   ) 

Value:

{ \
    p   = picref->data[0] + (x) * pixel_step + ((y) * picref->linesize[0]); \
    alpha = rgba_color[3] * (val) * 129;                              \
    *(p+r_off) = (alpha * rgba_color[0] + (255*255*129 - alpha) * *(p+r_off)) >> 23; \
    *(p+g_off) = (alpha * rgba_color[1] + (255*255*129 - alpha) * *(p+g_off)) >> 23; \
    *(p+b_off) = (alpha * rgba_color[2] + (255*255*129 - alpha) * *(p+b_off)) >> 23; \
}

Definition at line 448 of file vf_drawtext.c.

Referenced by draw_glyph_rgb(), and drawbox().

#define SET_PIXEL_YUV ( picref,
yuva_color,
val,
x,
y,
hsub,
vsub   ) 

Value:

{           \
    luma_pos    = ((x)          ) + ((y)          ) * picref->linesize[0]; \
    alpha = yuva_color[3] * (val) * 129;                               \
    picref->data[0][luma_pos]    = (alpha * yuva_color[0] + (255*255*129 - alpha) * picref->data[0][luma_pos]   ) >> 23; \
    if (((x) & ((1<<(hsub)) - 1)) == 0 && ((y) & ((1<<(vsub)) - 1)) == 0) {\
        chroma_pos1 = ((x) >> (hsub)) + ((y) >> (vsub)) * picref->linesize[1]; \
        chroma_pos2 = ((x) >> (hsub)) + ((y) >> (vsub)) * picref->linesize[2]; \
        picref->data[1][chroma_pos1] = (alpha * yuva_color[1] + (255*255*129 - alpha) * picref->data[1][chroma_pos1]) >> 23; \
        picref->data[2][chroma_pos2] = (alpha * yuva_color[2] + (255*255*129 - alpha) * picref->data[2][chroma_pos2]) >> 23; \
    }\
}

Definition at line 409 of file vf_drawtext.c.

Referenced by draw_glyph_yuv(), and drawbox().

Function Documentation

static int config_input ( AVFilterLink *  inlink  )  [static]

Definition at line 372 of file vf_drawtext.c.

static int draw_glyph_rgb ( AVFilterBufferRef *  picref,
FT_Bitmap *  bitmap,
unsigned int  x,
unsigned int  y,
unsigned int  width,
unsigned int  height,
int  pixel_step,
const uint8_t  rgba_color[4],
const uint8_t  rgba_map[4] 
) [inline, static]

Definition at line 456 of file vf_drawtext.c.

Referenced by draw_glyphs().

static int draw_glyph_yuv ( AVFilterBufferRef *  picref,
FT_Bitmap *  bitmap,
unsigned int  x,
unsigned int  y,
unsigned int  width,
unsigned int  height,
const uint8_t  yuva_color[4],
int  hsub,
int  vsub 
) [inline, static]

Definition at line 421 of file vf_drawtext.c.

Referenced by draw_glyphs().

static int draw_glyphs ( DrawTextContext *  dtext,
AVFilterBufferRef *  picref,
int  width,
int  height,
const uint8_t  rgbcolor[4],
const uint8_t  yuvcolor[4],
int  x,
int  y 
) [static]

Definition at line 520 of file vf_drawtext.c.

Referenced by draw_text().

static int draw_text ( AVFilterContext *  ctx,
AVFilterBufferRef *  picref,
int  width,
int  height 
) [static]

Definition at line 558 of file vf_drawtext.c.

Referenced by end_frame().

static void drawbox ( AVFilterBufferRef *  picref,
unsigned int  x,
unsigned int  y,
unsigned int  width,
unsigned int  height,
uint8_t *  line[4],
int  pixel_step[4],
uint8_t  color[4],
int  hsub,
int  vsub,
int  is_rgba_packed,
uint8_t  rgba_map[4] 
) [inline, static]

Definition at line 488 of file vf_drawtext.c.

Referenced by avfilter_register_all(), config_input(), draw_slice(), draw_text(), and init().

static const char* drawtext_get_name ( void *  ctx  )  [static]

Definition at line 123 of file vf_drawtext.c.

static void end_frame ( AVFilterLink *  inlink  )  [static]

Definition at line 690 of file vf_drawtext.c.

static int glyph_cmp ( void *  key,
const void *  b 
) [static]

Definition at line 158 of file vf_drawtext.c.

Referenced by draw_glyphs(), draw_text(), and load_glyph().

static int glyph_enu_free ( void *  opaque,
void *  elem 
) [static]

Definition at line 341 of file vf_drawtext.c.

Referenced by uninit().

static av_cold int init ( AVFilterContext *  ctx,
const char *  args,
void *  opaque 
) [static]

Definition at line 219 of file vf_drawtext.c.

static int is_newline ( uint32_t  c  )  [inline, static]

Definition at line 515 of file vf_drawtext.c.

Referenced by draw_text().

static int load_glyph ( AVFilterContext *  ctx,
Glyph **  glyph_ptr,
uint32_t  code 
) [static]

Load glyphs corresponding to the UTF-32 codepoint code.

Definition at line 168 of file vf_drawtext.c.

Referenced by draw_text(), and init().

static void null_draw_slice ( AVFilterLink *  link,
int  y,
int  h,
int  slice_dir 
) [static]

Definition at line 688 of file vf_drawtext.c.

static int query_formats ( AVFilterContext *  ctx  )  [static]

Definition at line 325 of file vf_drawtext.c.

static av_cold void uninit ( AVFilterContext *  ctx  )  [static]

Definition at line 347 of file vf_drawtext.c.

Variable Documentation

AVFilter avfilter_vf_drawtext

Initial value:

 {
    .name          = "drawtext",
    .description   = NULL_IF_CONFIG_SMALL("Draw text on top of video frames using libfreetype library."),
    .priv_size     = sizeof(DrawTextContext),
    .init          = init,
    .uninit        = uninit,
    .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,
                                    .draw_slice       = null_draw_slice,
                                    .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}},
}

Definition at line 701 of file vf_drawtext.c.

const AVClass drawtext_class [static]

Initial value:

 {
    "DrawTextContext",
    drawtext_get_name,
    drawtext_options
}

Definition at line 128 of file vf_drawtext.c.

const AVOption drawtext_options[] [static]

Definition at line 88 of file vf_drawtext.c.

struct ft_error ft_errors[]

Generated on Fri Oct 26 02:39:48 2012 for FFmpeg by  doxygen 1.5.8