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

#include <sys/time.h>
#include <time.h>
#include "config.h"
#include "libavutil/avstring.h"
#include "libavutil/bprint.h"
#include "libavutil/common.h"
#include "libavutil/file.h"
#include "libavutil/eval.h"
#include "libavutil/opt.h"
#include "libavutil/random_seed.h"
#include "libavutil/parseutils.h"
#include "libavutil/timecode.h"
#include "libavutil/tree.h"
#include "libavutil/lfg.h"
#include "avfilter.h"
#include "drawutils.h"
#include "formats.h"
#include "internal.h"
#include "video.h"
#include <ft2build.h>
#include <freetype/config/ftheader.h>
#include <FT_FREETYPE_H>
#include <FT_GLYPH_H>
#include <FT_ERRORS_H>

Data Structures
struct	DrawTextContext

struct	ft_error

struct	drawtext_function

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

#define	FLAGS AV_OPT_FLAG_FILTERING_PARAM\|AV_OPT_FLAG_VIDEO_PARAM

#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

Typedefs
typedef double(*	eval_func2 )(void *, double a, double b)

Enumerations
enum	var_name { VAR_B1, VAR_B2, VAR_S1, VAR_S2, VAR_T1, VAR_T2, VAR_NB, VAR_N, VAR_T, VAR_S, VAR_VARS_NB, VAR_TB, VAR_PTS, VAR_START_PTS, VAR_PREV_PTS, VAR_PREV_SELECTED_PTS, VAR_T, VAR_START_T, VAR_PREV_T, VAR_PREV_SELECTED_T, VAR_PICT_TYPE, VAR_I, VAR_P, VAR_B, VAR_S, VAR_SI, VAR_SP, VAR_BI, VAR_PICT_TYPE_I, VAR_PICT_TYPE_P, VAR_PICT_TYPE_B, VAR_PICT_TYPE_S, VAR_PICT_TYPE_SI, VAR_PICT_TYPE_SP, VAR_PICT_TYPE_BI, VAR_INTERLACE_TYPE, VAR_INTERLACE_TYPE_P, VAR_INTERLACE_TYPE_T, VAR_INTERLACE_TYPE_B, VAR_CONSUMED_SAMPLES_N, VAR_SAMPLES_N, VAR_SAMPLE_RATE, VAR_N, VAR_SELECTED_N, VAR_PREV_SELECTED_N, VAR_KEY, VAR_POS, VAR_SCENE, VAR_VARS_NB, VAR_AVTB, VAR_INTB, VAR_SR, VAR_VARS_NB, VAR_FRAME_RATE, VAR_INTERLACED, VAR_N, VAR_NB_CONSUMED_SAMPLES, VAR_NB_SAMPLES, VAR_POS, VAR_PREV_INPTS, VAR_PREV_INT, VAR_PREV_OUTPTS, VAR_PREV_OUTT, VAR_PTS, VAR_SAMPLE_RATE, VAR_STARTPTS, VAR_STARTT, VAR_T, VAR_TB, VAR_RTCTIME, VAR_RTCSTART, VAR_S, VAR_SR, VAR_VARS_NB, VAR_W, VAR_H, VAR_CW, VAR_CH, VAR_HSUB, VAR_VSUB, VARS_NB, VAR_IN_W, VAR_IW, VAR_IN_H, VAR_IH, VAR_OUT_W, VAR_OW, VAR_OUT_H, VAR_OH, VAR_A, VAR_SAR, VAR_DAR, VAR_HSUB, VAR_VSUB, VAR_X, VAR_Y, VAR_N, VAR_POS, VAR_T, VAR_VARS_NB, VAR_DAR, VAR_HSUB, VAR_VSUB, VAR_IN_H, VAR_IH, VAR_IN_W, VAR_IW, VAR_SAR, VAR_X, VAR_Y, VAR_H, VAR_W, VAR_T, VARS_NB, VAR_DAR, VAR_HSUB, VAR_VSUB, VAR_LINE_H, VAR_LH, VAR_MAIN_H, VAR_h, VAR_H, VAR_MAIN_W, VAR_w, VAR_W, VAR_MAX_GLYPH_A, VAR_ASCENT, VAR_MAX_GLYPH_D, VAR_DESCENT, VAR_MAX_GLYPH_H, VAR_MAX_GLYPH_W, VAR_N, VAR_SAR, VAR_T, VAR_TEXT_H, VAR_TH, VAR_TEXT_W, VAR_TW, VAR_X, VAR_Y, VAR_PICT_TYPE, VAR_VARS_NB, VAR_N, VAR_PTS, VAR_R, VAR_T, VAR_TB, VAR_NB, VAR_W, VAR_H, VAR_VAL, VAR_MAXVAL, VAR_MINVAL, VAR_NEGVAL, VAR_CLIPVAL, VAR_VARS_NB, VAR_MAIN_W, VAR_MW, VAR_MAIN_H, VAR_MH, VAR_OVERLAY_W, VAR_OW, VAR_OVERLAY_H, VAR_OH, VAR_HSUB, VAR_VSUB, VAR_X, VAR_Y, VAR_N, VAR_POS, VAR_T, VAR_VARS_NB, VAR_IN_W, VAR_IW, VAR_IN_H, VAR_IH, VAR_OUT_W, VAR_OW, VAR_OUT_H, VAR_OH, VAR_X, VAR_Y, VAR_A, VAR_SAR, VAR_DAR, VAR_HSUB, VAR_VSUB, VARS_NB, VAR_IN_W, VAR_IW, VAR_IN_H, VAR_IH, VAR_OUT_W, VAR_OW, VAR_OUT_H, VAR_OH, VAR_HSUB, VAR_VSUB, VAR_N, VAR_T, VAR_VARS_NB, VAR_IN_W, VAR_IW, VAR_IN_H, VAR_IH, VAR_OUT_W, VAR_OW, VAR_OUT_H, VAR_OH, VAR_A, VAR_SAR, VAR_DAR, VAR_HSUB, VAR_VSUB, VARS_NB, VAR_W, VAR_H, VAR_N, VAR_PTS, VAR_R, VAR_T, VAR_TB, VAR_NB, VAR_X, VAR_Y, VAR_W, VAR_H, VAR_TIME, VAR_SPEED, VAR_TEMPO, VAR_ORDER, VAR_PATTERN, VAR_ROW, VAR_VARS_NB }

enum	expansion_mode { EXP_NONE, EXP_NORMAL, EXP_STRFTIME }

Functions
static double	drand (void *opaque, double min, double max)

	AVFILTER_DEFINE_CLASS (drawtext)

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 int	load_font_file (AVFilterContext ctx, const char path, int index, const char **error)

static int	load_font (AVFilterContext *ctx)

static int	load_textfile (AVFilterContext *ctx)

static av_cold int	init (AVFilterContext *ctx)

static int	query_formats (AVFilterContext *ctx)

static int	glyph_enu_free (void opaque, void elem)

static av_cold void	uninit (AVFilterContext *ctx)

static int	is_newline (uint32_t c)

static int	config_input (AVFilterLink *inlink)

static int	command (AVFilterContext ctx, const char cmd, const char arg, char res, int res_len, int flags)

static int	func_pict_type (AVFilterContext ctx, AVBPrint bp, char fct, unsigned argc, char *argv, int tag)

static int	func_pts (AVFilterContext ctx, AVBPrint bp, char fct, unsigned argc, char *argv, int tag)

static int	func_frame_num (AVFilterContext ctx, AVBPrint bp, char fct, unsigned argc, char *argv, int tag)

static int	func_metadata (AVFilterContext ctx, AVBPrint bp, char fct, unsigned argc, char *argv, int tag)

static void	localtime_r (const time_t t, struct tm tm)

static int	func_strftime (AVFilterContext ctx, AVBPrint bp, char fct, unsigned argc, char *argv, int tag)

static int	func_eval_expr (AVFilterContext ctx, AVBPrint bp, char fct, unsigned argc, char *argv, int tag)

static int	eval_function (AVFilterContext ctx, AVBPrint bp, char fct, unsigned argc, char *argv)

static int	expand_function (AVFilterContext ctx, AVBPrint bp, char **rtext)

static int	expand_text (AVFilterContext *ctx)

static int	draw_glyphs (DrawTextContext s, AVFrame frame, int width, int height, const uint8_t rgbcolor[4], FFDrawColor *color, int x, int y)

static int	draw_text (AVFilterContext ctx, AVFrame frame, int width, int height)

static int	filter_frame (AVFilterLink inlink, AVFrame frame)

Variables
static const char *const	var_names []

static const char *const	fun2_names []

static const eval_func2	fun2 []

static const AVOption	drawtext_options []

struct ft_error	ft_errors []

static struct drawtext_function	functions []

static const AVFilterPad	avfilter_vf_drawtext_inputs []

static const AVFilterPad	avfilter_vf_drawtext_outputs []

AVFilter	avfilter_vf_drawtext

Detailed Description

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

Definition in file vf_drawtext.c.

Macro Definition Documentation

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

Definition at line 171 of file vf_drawtext.c.

#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

Definition at line 172 of file vf_drawtext.c.

#define FT_ERROR_START_LIST {

Definition at line 228 of file vf_drawtext.c.

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

Definition at line 229 of file vf_drawtext.c.

#define FT_ERROR_END_LIST { 0, NULL } };

Definition at line 230 of file vf_drawtext.c.

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

Referenced by init(), and load_font_file().

Typedef Documentation

typedef double(* eval_func2)(void *, double a, double b)

Definition at line 88 of file vf_drawtext.c.

Enumeration Type Documentation

enum var_name

Enumerator:

VAR_B1
VAR_B2
VAR_S1
VAR_S2
VAR_T1
VAR_T2
VAR_NB
VAR_N
VAR_T
VAR_S
VAR_VARS_NB
VAR_TB
VAR_PTS
VAR_START_PTS
VAR_PREV_PTS
VAR_PREV_SELECTED_PTS
VAR_T
VAR_START_T
VAR_PREV_T
VAR_PREV_SELECTED_T
VAR_PICT_TYPE
VAR_I
VAR_P
VAR_B
VAR_S
VAR_SI
VAR_SP
VAR_BI
VAR_PICT_TYPE_I
VAR_PICT_TYPE_P
VAR_PICT_TYPE_B
VAR_PICT_TYPE_S
VAR_PICT_TYPE_SI
VAR_PICT_TYPE_SP
VAR_PICT_TYPE_BI
VAR_INTERLACE_TYPE
VAR_INTERLACE_TYPE_P
VAR_INTERLACE_TYPE_T
VAR_INTERLACE_TYPE_B
VAR_CONSUMED_SAMPLES_N
VAR_SAMPLES_N
VAR_SAMPLE_RATE
VAR_N
VAR_SELECTED_N
VAR_PREV_SELECTED_N
VAR_KEY
VAR_POS
VAR_SCENE
VAR_VARS_NB
VAR_AVTB
VAR_INTB
VAR_SR
VAR_VARS_NB
VAR_FRAME_RATE
VAR_INTERLACED
VAR_N
VAR_NB_CONSUMED_SAMPLES
VAR_NB_SAMPLES
VAR_POS
VAR_PREV_INPTS
VAR_PREV_INT
VAR_PREV_OUTPTS
VAR_PREV_OUTT
VAR_PTS
VAR_SAMPLE_RATE
VAR_STARTPTS
VAR_STARTT
VAR_T
VAR_TB
VAR_RTCTIME
VAR_RTCSTART
VAR_S
VAR_SR
VAR_VARS_NB
VAR_W
VAR_H
VAR_CW
VAR_CH
VAR_HSUB
VAR_VSUB
VARS_NB
VAR_IN_W
VAR_IW
VAR_IN_H
VAR_IH
VAR_OUT_W
VAR_OW
VAR_OUT_H
VAR_OH
VAR_A
VAR_SAR
VAR_DAR
VAR_HSUB
VAR_VSUB
VAR_X
VAR_Y
VAR_N
VAR_POS
VAR_T
VAR_VARS_NB
VAR_DAR
VAR_HSUB
VAR_VSUB
VAR_IN_H
VAR_IH
VAR_IN_W
VAR_IW
VAR_SAR
VAR_X
VAR_Y
VAR_H
VAR_W
VAR_T
VARS_NB
VAR_DAR
VAR_HSUB
VAR_VSUB
VAR_LINE_H
VAR_LH
VAR_MAIN_H
VAR_h
VAR_H
VAR_MAIN_W
VAR_w
VAR_W
VAR_MAX_GLYPH_A
VAR_ASCENT
VAR_MAX_GLYPH_D
VAR_DESCENT
VAR_MAX_GLYPH_H
VAR_MAX_GLYPH_W
VAR_N
VAR_SAR
VAR_T
VAR_TEXT_H
VAR_TH
VAR_TEXT_W
VAR_TW
VAR_X
VAR_Y
VAR_PICT_TYPE
VAR_VARS_NB
VAR_N
VAR_PTS
VAR_R
VAR_T
VAR_TB
VAR_NB
VAR_W
VAR_H
VAR_VAL
VAR_MAXVAL
VAR_MINVAL
VAR_NEGVAL
VAR_CLIPVAL
VAR_VARS_NB
VAR_MAIN_W
VAR_MW
VAR_MAIN_H
VAR_MH
VAR_OVERLAY_W
VAR_OW
VAR_OVERLAY_H
VAR_OH
VAR_HSUB
VAR_VSUB
VAR_X
VAR_Y
VAR_N
VAR_POS
VAR_T
VAR_VARS_NB
VAR_IN_W
VAR_IW
VAR_IN_H
VAR_IH
VAR_OUT_W
VAR_OW
VAR_OUT_H
VAR_OH
VAR_X
VAR_Y
VAR_A
VAR_SAR
VAR_DAR
VAR_HSUB
VAR_VSUB
VARS_NB
VAR_IN_W
VAR_IW
VAR_IN_H
VAR_IH
VAR_OUT_W
VAR_OW
VAR_OUT_H
VAR_OH
VAR_HSUB
VAR_VSUB
VAR_N
VAR_T
VAR_VARS_NB
VAR_IN_W
VAR_IW
VAR_IN_H
VAR_IH
VAR_OUT_W
VAR_OW
VAR_OUT_H
VAR_OH
VAR_A
VAR_SAR
VAR_DAR
VAR_HSUB
VAR_VSUB
VARS_NB
VAR_W
VAR_H
VAR_N
VAR_PTS
VAR_R
VAR_T
VAR_TB
VAR_NB
VAR_X
VAR_Y
VAR_W
VAR_H
VAR_TIME
VAR_SPEED
VAR_TEMPO
VAR_ORDER
VAR_PATTERN
VAR_ROW
VAR_VARS_NB

Definition at line 95 of file vf_drawtext.c.

enum expansion_mode

Enumerator:

EXP_NONE
EXP_NORMAL
EXP_STRFTIME

Definition at line 116 of file vf_drawtext.c.

Function Documentation

static double drand	(	void *	opaque,
		double	min,
		double	max
	)

static

Definition at line 83 of file vf_drawtext.c.

AVFILTER_DEFINE_CLASS ( drawtext )

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

static

Definition at line 251 of file vf_drawtext.c.

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

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 261 of file vf_drawtext.c.

Referenced by draw_text(), and init().

static int load_font_file	(	AVFilterContext *	ctx,
		const char *	path,
		int	index,
		const char **	error
	)

static

Definition at line 312 of file vf_drawtext.c.

Referenced by load_font().

static int load_font ( AVFilterContext * ctx )

static

Definition at line 377 of file vf_drawtext.c.

Referenced by init().

static int load_textfile ( AVFilterContext * ctx )

static

Definition at line 397 of file vf_drawtext.c.

Referenced by filter_frame(), and init().

static av_cold int init ( AVFilterContext * ctx )

static

Definition at line 420 of file vf_drawtext.c.

Referenced by command().

static int query_formats ( AVFilterContext * ctx )

static

Definition at line 499 of file vf_drawtext.c.

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

static

Definition at line 505 of file vf_drawtext.c.

Referenced by uninit().

static av_cold void uninit ( AVFilterContext * ctx )

static

Definition at line 515 of file vf_drawtext.c.

Referenced by command().

static int is_newline ( uint32_t c )

inlinestatic

Definition at line 537 of file vf_drawtext.c.

Referenced by draw_text().

static int config_input ( AVFilterLink * inlink )

static

Definition at line 542 of file vf_drawtext.c.

Referenced by command().

static int command	(	AVFilterContext *	ctx,
		const char *	cmd,
		const char *	arg,
		char *	res,
		int	res_len,
		int	flags
	)

static

Definition at line 581 of file vf_drawtext.c.

Referenced by cdg_decode_frame(), check_keyboard_interaction(), decode_subframe_lpc(), ftp_abort(), ftp_current_dir(), ftp_file_size(), ftp_passive_mode(), ftp_restart(), ftp_retrieve(), ftp_store(), ftp_type(), idcin_read_packet(), read_connect(), and send_invoke_response().

static int func_pict_type	(	AVFilterContext *	ctx,
		AVBPrint *	bp,
		char *	fct,
		unsigned	argc,
		char **	argv,
		int	tag
	)

static

Definition at line 597 of file vf_drawtext.c.

static int func_pts	(	AVFilterContext *	ctx,
		AVBPrint *	bp,
		char *	fct,
		unsigned	argc,
		char **	argv,
		int	tag
	)

static

Definition at line 606 of file vf_drawtext.c.

static int func_frame_num	(	AVFilterContext *	ctx,
		AVBPrint *	bp,
		char *	fct,
		unsigned	argc,
		char **	argv,
		int	tag
	)

static

Definition at line 615 of file vf_drawtext.c.

static int func_metadata	(	AVFilterContext *	ctx,
		AVBPrint *	bp,
		char *	fct,
		unsigned	argc,
		char **	argv,
		int	tag
	)

static

Definition at line 624 of file vf_drawtext.c.

static void localtime_r	(	const time_t *	t,
		struct tm *	tm
	)

static

Definition at line 636 of file vf_drawtext.c.

Referenced by draw_text(), func_strftime(), and insert_datetime().

static int func_strftime	(	AVFilterContext *	ctx,
		AVBPrint *	bp,
		char *	fct,
		unsigned	argc,
		char **	argv,
		int	tag
	)

static

Definition at line 642 of file vf_drawtext.c.

static int func_eval_expr	(	AVFilterContext *	ctx,
		AVBPrint *	bp,
		char *	fct,
		unsigned	argc,
		char **	argv,
		int	tag
	)

static

Definition at line 658 of file vf_drawtext.c.

static int eval_function	(	AVFilterContext *	ctx,
		AVBPrint *	bp,
		char *	fct,
		unsigned	argc,
		char **	argv
	)

static

Definition at line 695 of file vf_drawtext.c.

Referenced by expand_function().

static int expand_function	(	AVFilterContext *	ctx,
		AVBPrint *	bp,
		char **	rtext
	)

static

Definition at line 722 of file vf_drawtext.c.

Referenced by expand_text().

static int expand_text ( AVFilterContext * ctx )

static

Definition at line 762 of file vf_drawtext.c.

Referenced by draw_text().

static int draw_glyphs	(	DrawTextContext *	s,
		AVFrame *	frame,
		int	width,
		int	height,
		const uint8_t	rgbcolor[4],
		FFDrawColor *	color,
		int	x,
		int	y
	)

static

Definition at line 788 of file vf_drawtext.c.

Referenced by draw_text().

static int draw_text	(	AVFilterContext *	ctx,
		AVFrame *	frame,
		int	width,
		int	height
	)

static

Definition at line 826 of file vf_drawtext.c.

Referenced by filter_frame().

static int filter_frame	(	AVFilterLink *	inlink,
		AVFrame *	frame
	)

static

Definition at line 985 of file vf_drawtext.c.

Variable Documentation

const char* const var_names[]

static

Initial value:

= {
    "dar",
    "hsub", "vsub",
    "line_h", "lh",           
    "main_h", "h", "H",       
    "main_w", "w", "W",       
    "max_glyph_a", "ascent",  
    "max_glyph_d", "descent", 
    "max_glyph_h",            
    "max_glyph_w",            
    "n",                      
    "sar",
    "t",                      
    "text_h", "th",           
    "text_w", "tw",           
    "x",
    "y",
    "pict_type",
    NULL
}

Definition at line 58 of file vf_drawtext.c.

Referenced by config_input(), and func_eval_expr().

const char* const fun2_names[]

static

Initial value:

= {
    "rand"
}

Definition at line 79 of file vf_drawtext.c.

Referenced by config_input(), and func_eval_expr().

const eval_func2 fun2[]

static

Initial value:

= {
    drand,
    NULL
}

Definition at line 90 of file vf_drawtext.c.

Referenced by config_input(), and func_eval_expr().

const AVOption drawtext_options[]

static

Definition at line 174 of file vf_drawtext.c.

struct ft_error ft_errors[]

Initial value:

=
#define FT_ERRMSG(e) 
typedef struct {
    FT_Glyph *glyph;
    uint32_t code;
    FT_Bitmap bitmap; 
    FT_BBox bbox;
    int advance;
    int bitmap_left;
    int bitmap_top;
} Glyph

struct drawtext_function functions[]

static

Initial value:

= {
    { "expr",      1, 1, 0,   func_eval_expr },
    { "e",         1, 1, 0,   func_eval_expr },
    { "pict_type", 0, 0, 0,   func_pict_type },
    { "pts",       0, 0, 0,   func_pts      },
    { "gmtime",    0, 1, 'G', func_strftime },
    { "localtime", 0, 1, 'L', func_strftime },
    { "frame_num", 0, 0, 0,   func_frame_num },
    { "n",         0, 0, 0,   func_frame_num },
    { "metadata",  1, 1, 0,   func_metadata },
}

Referenced by eval_function().

const AVFilterPad avfilter_vf_drawtext_inputs[]

static

Initial value:

= {
    {
        .name             = "default",
        .type             = AVMEDIA_TYPE_VIDEO,
        .get_video_buffer = ff_null_get_video_buffer,
        .filter_frame     = filter_frame,
        .config_props     = config_input,
        .needs_writable   = 1,
    },
    { NULL }
}

Definition at line 1013 of file vf_drawtext.c.

const AVFilterPad avfilter_vf_drawtext_outputs[]

static

Initial value:

= {
    {
        .name = "default",
        .type = AVMEDIA_TYPE_VIDEO,
    },
    { NULL }
}

Definition at line 1025 of file vf_drawtext.c.

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),
    .priv_class    = &drawtext_class,
    .init          = init,
    .uninit        = uninit,
    .query_formats = query_formats,
    .inputs    = avfilter_vf_drawtext_inputs,
    .outputs   = avfilter_vf_drawtext_outputs,
    .process_command = command,
}

Definition at line 1033 of file vf_drawtext.c.

Data Structures

Macros

Typedefs

Enumerations

Functions

Variables

Detailed Description

Macro Definition Documentation

Typedef Documentation

Enumeration Type Documentation

Function Documentation

Variable Documentation