FFmpeg
4.3.7
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Filter for reading closed captioning data (EIA-608). More...
#include <string.h>
#include "libavutil/internal.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "libavutil/timestamp.h"
#include "avfilter.h"
#include "formats.h"
#include "internal.h"
#include "video.h"
Go to the source code of this file.
Data Structures | |
struct | LineItem |
struct | CodeItem |
struct | ReadEIA608Context |
Macros | |
#define | LAG 25 |
#define | CLOCK_BITSIZE_MIN 0.2f |
#define | CLOCK_BITSIZE_MAX 1.5f |
#define | SYNC_BITSIZE_MIN 12.f |
#define | SYNC_BITSIZE_MAX 15.f |
#define | OFFSET(x) offsetof(ReadEIA608Context, x) |
#define | FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM |
Functions | |
AVFILTER_DEFINE_CLASS (readeia608) | |
static int | query_formats (AVFilterContext *ctx) |
static int | config_input (AVFilterLink *inlink) |
static void | build_histogram (ReadEIA608Context *s, const LineItem *line, int len) |
static void | find_black_and_white (ReadEIA608Context *s) |
static float | meanf (const LineItem *line, int len) |
static float | stddevf (const LineItem *line, int len) |
static void | thresholding (ReadEIA608Context *s, LineItem *line, int lag, float threshold, float influence, int len) |
static int | periods (const LineItem *line, CodeItem *code, int len) |
static void | dump_code (AVFilterContext *ctx, int len, int item) |
static void | extract_line (AVFilterContext *ctx, AVFrame *in, int w, int nb_line) |
static int | filter_frame (AVFilterLink *inlink, AVFrame *in) |
static av_cold void | uninit (AVFilterContext *ctx) |
Variables | |
static const AVOption | readeia608_options [] |
static const AVFilterPad | readeia608_inputs [] |
static const AVFilterPad | readeia608_outputs [] |
AVFilter | ff_vf_readeia608 |
Filter for reading closed captioning data (EIA-608).
See also https://en.wikipedia.org/wiki/EIA-608
Definition in file vf_readeia608.c.
#define LAG 25 |
Definition at line 39 of file vf_readeia608.c.
Referenced by build_histogram(), config_input(), extract_line(), and periods().
#define CLOCK_BITSIZE_MIN 0.2f |
Definition at line 40 of file vf_readeia608.c.
Referenced by extract_line().
#define CLOCK_BITSIZE_MAX 1.5f |
Definition at line 41 of file vf_readeia608.c.
Referenced by extract_line().
#define SYNC_BITSIZE_MIN 12.f |
Definition at line 42 of file vf_readeia608.c.
Referenced by extract_line().
#define SYNC_BITSIZE_MAX 15.f |
Definition at line 43 of file vf_readeia608.c.
Referenced by extract_line().
#define OFFSET | ( | x | ) | offsetof(ReadEIA608Context, x) |
Definition at line 76 of file vf_readeia608.c.
#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM |
Definition at line 77 of file vf_readeia608.c.
AVFILTER_DEFINE_CLASS | ( | readeia608 | ) |
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Definition at line 90 of file vf_readeia608.c.
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Definition at line 108 of file vf_readeia608.c.
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Definition at line 132 of file vf_readeia608.c.
Referenced by extract_line().
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Definition at line 140 of file vf_readeia608.c.
Referenced by extract_line().
Definition at line 182 of file vf_readeia608.c.
Referenced by stddevf(), and thresholding().
Definition at line 194 of file vf_readeia608.c.
Referenced by thresholding().
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Definition at line 205 of file vf_readeia608.c.
Referenced by extract_line().
Definition at line 244 of file vf_readeia608.c.
Referenced by extract_line().
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Definition at line 267 of file vf_readeia608.c.
Referenced by extract_line().
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Definition at line 278 of file vf_readeia608.c.
Referenced by filter_frame().
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Definition at line 393 of file vf_readeia608.c.
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Definition at line 407 of file vf_readeia608.c.
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Definition at line 79 of file vf_readeia608.c.
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Definition at line 415 of file vf_readeia608.c.
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Definition at line 425 of file vf_readeia608.c.
AVFilter ff_vf_readeia608 |
Definition at line 433 of file vf_readeia608.c.