vf_readvitc.c File Reference

Filter for reading the vertical interval timecode (VITC). More...

#include "libavutil/common.h"
#include "libavutil/internal.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "libavutil/timecode.h"
#include "avfilter.h"
#include "formats.h"
#include "internal.h"

Go to the source code of this file.

Data Structures
struct	ReadVitcContext

Macros
#define	LINE_DATA_SIZE   9
#define	OFFSET(x)   offsetof(ReadVitcContext, x)
#define	FLAGS   AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

Functions
	AVFILTER_DEFINE_CLASS (readvitc)
static uint8_t	get_vitc_crc (uint8_t *line)
static uint8_t	get_pit_avg3 (uint8_t *line, int i)
static int	read_vitc_line (ReadVitcContext *ctx, uint8_t *src, int line_size, int width, int height)
static unsigned	bcd2uint (uint8_t high, uint8_t low)
static char *	make_vitc_tc_string (char *buf, uint8_t *line)
static av_cold int	init (AVFilterContext *ctx)
static int	config_props (AVFilterLink *inlink)
static int	query_formats (AVFilterContext *ctx)
static int	filter_frame (AVFilterLink *inlink, AVFrame *frame)

Variables
static const AVOption	readvitc_options []
static const AVFilterPad	inputs []
static const AVFilterPad	outputs []
AVFilter	ff_vf_readvitc

Detailed Description

Filter for reading the vertical interval timecode (VITC).

See also https://en.wikipedia.org/wiki/Vertical_interval_timecode

Definition in file vf_readvitc.c.

Macro Definition Documentation

LINE_DATA_SIZE

#define LINE_DATA_SIZE   9

Definition at line 36 of file vf_readvitc.c.

Referenced by read_vitc_line().

OFFSET

#define OFFSET

(

x

)

offsetof(ReadVitcContext, x)

Definition at line 53 of file vf_readvitc.c.

FLAGS

#define FLAGS   AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

Definition at line 54 of file vf_readvitc.c.

Function Documentation

AVFILTER_DEFINE_CLASS()

AVFILTER_DEFINE_CLASS

(

readvitc

)

get_vitc_crc()

static uint8_t get_vitc_crc ( uint8_t *  line )

static

Definition at line 65 of file vf_readvitc.c.

Referenced by read_vitc_line().

get_pit_avg3()

static uint8_t get_pit_avg3 ( uint8_t *  line, int  i  )

inlinestatic

Definition at line 83 of file vf_readvitc.c.

Referenced by read_vitc_line().

read_vitc_line()

static int read_vitc_line ( ReadVitcContext *  ctx, uint8_t *  src, int  line_size, int  width, int  height  )

static

Definition at line 87 of file vf_readvitc.c.

Referenced by filter_frame().

bcd2uint()

static unsigned bcd2uint ( uint8_t  high, uint8_t  low  )

static

Definition at line 139 of file vf_readvitc.c.

Referenced by make_vitc_tc_string().

make_vitc_tc_string()

static char* make_vitc_tc_string ( char *  buf, uint8_t *  line  )

static

Definition at line 146 of file vf_readvitc.c.

Referenced by filter_frame().

init()

static av_cold int init ( AVFilterContext *  ctx )

static

Definition at line 158 of file vf_readvitc.c.

config_props()

static int config_props ( AVFilterLink *  inlink )

static

Definition at line 176 of file vf_readvitc.c.

query_formats()

static int query_formats ( AVFilterContext *  ctx )

static

Definition at line 187 of file vf_readvitc.c.

filter_frame()

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

static

Definition at line 216 of file vf_readvitc.c.

Variable Documentation

readvitc_options

const AVOption readvitc_options[]

static

Initial value:

= {
    { "scan_max", "maximum line numbers to scan for VITC data", OFFSET(scan_max), AV_OPT_TYPE_INT, {.i64 = 45 }, -1, INT_MAX, FLAGS },
    { "thr_b",    "black color threshold", OFFSET(thr_b), AV_OPT_TYPE_DOUBLE, {.dbl = 0.2 }, 0, 1.0, FLAGS },
    { "thr_w",    "white color threshold", OFFSET(thr_w), AV_OPT_TYPE_DOUBLE, {.dbl = 0.6 }, 0, 1.0, FLAGS },
    { NULL }
}

Definition at line 56 of file vf_readvitc.c.

inputs

const AVFilterPad inputs[]

static

Initial value:

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

Definition at line 231 of file vf_readvitc.c.

outputs

const AVFilterPad outputs[]

static

Initial value:

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

Definition at line 241 of file vf_readvitc.c.

ff_vf_readvitc

AVFilter ff_vf_readvitc

Initial value:

= {
    .name          = "readvitc",
    .description   = NULL_IF_CONFIG_SMALL("Read vertical interval timecode and write it to frame metadata."),
    .priv_size     = sizeof(ReadVitcContext),
    .priv_class    = &readvitc_class,
    .inputs        = inputs,
    .outputs       = outputs,
    .init          = init,
    .query_formats = query_formats,
}

Definition at line 249 of file vf_readvitc.c.