ccaption_dec.c File Reference

#include "avcodec.h"
#include "ass.h"
#include "libavutil/internal.h"
#include "libavutil/opt.h"

Go to the source code of this file.

Data Structures
struct	Screen
struct	CCaptionSubContext

Macros
#define	SCREEN_ROWS   15
#define	SCREEN_COLUMNS   32
#define	SET_FLAG(var, val)   ( (var) |= ( 1 << (val)) )
#define	UNSET_FLAG(var, val)   ( (var) &= ~( 1 << (val)) )
#define	CHECK_FLAG(var, val)   ( (var) & ( 1 << (val)) )
#define	COR3(var, with1, with2, with3)   ( (var) == (with1) || (var) == (with2) || (var) == (with3) )

Enumerations
enum	cc_mode {   CCMODE_POPON, CCMODE_PAINTON, CCMODE_ROLLUP_2, CCMODE_ROLLUP_3,   CCMODE_ROLLUP_4, CCMODE_TEXT }
enum	cc_color_code {   CCCOL_WHITE, CCCOL_GREEN, CCCOL_BLUE, CCCOL_CYAN,   CCCOL_RED, CCCOL_YELLOW, CCCOL_MAGENTA, CCCOL_USERDEFINED,   CCCOL_BLACK, CCCOL_TRANSPARENT }
enum	cc_font { CCFONT_REGULAR, CCFONT_ITALICS, CCFONT_UNDERLINED, CCFONT_UNDERLINED_ITALICS }

Functions
static av_cold int	init_decoder (AVCodecContext *avctx)
static av_cold int	close_decoder (AVCodecContext *avctx)
static int	write_char (CCaptionSubContext *ctx, char *row, uint8_t col, char ch)
static int	validate_cc_data_pair (uint8_t *cc_data_pair)
	This function after validating parity bit, also remove it from data pair. More...
static struct Screen *	get_writing_screen (CCaptionSubContext *ctx)
static void	roll_up (CCaptionSubContext *ctx)
static int	reap_screen (CCaptionSubContext *ctx, int64_t pts)
static void	handle_textattr (CCaptionSubContext *ctx, uint8_t hi, uint8_t lo)
static void	handle_pac (CCaptionSubContext *ctx, uint8_t hi, uint8_t lo)
static int	handle_edm (CCaptionSubContext *ctx, int64_t pts)
static int	handle_eoc (CCaptionSubContext *ctx, int64_t pts)
static void	handle_delete_end_of_row (CCaptionSubContext *ctx, char hi, char lo)
static void	handle_char (CCaptionSubContext *ctx, char hi, char lo, int64_t pts)
static int	process_cc608 (CCaptionSubContext *ctx, int64_t pts, uint8_t hi, uint8_t lo)
static int	decode (AVCodecContext *avctx, void *data, int *got_sub, AVPacket *avpkt)

Variables
static const unsigned char	pac2_attribs [32][3]
static const uint8_t	parity_table [256]
static const AVOption	options []
static const AVClass	ccaption_dec_class
AVCodec	ff_ccaption_decoder

Macro Definition Documentation

#define SCREEN_ROWS   15

Definition at line 27 of file ccaption_dec.c.

Referenced by reap_screen().

#define SCREEN_COLUMNS   32

Definition at line 28 of file ccaption_dec.c.

Referenced by roll_up(), and write_char().

#define SET_FLAG	(		var,
			val
	)		( (var) |= ( 1 << (val)) )

Definition at line 30 of file ccaption_dec.c.

Referenced by handle_char(), handle_textattr(), and roll_up().

#define UNSET_FLAG	(		var,
			val
	)		( (var) &= ~( 1 << (val)) )

Definition at line 31 of file ccaption_dec.c.

Referenced by roll_up().

#define CHECK_FLAG	(		var,
			val
	)		( (var) & ( 1 << (val)) )

Definition at line 32 of file ccaption_dec.c.

Referenced by reap_screen(), and roll_up().

#define COR3	(		var,
			with1,
			with2,
			with3
	)		( (var) == (with1) || (var) == (with2) || (var) == (with3) )

Referenced by process_cc608().

Enumeration Type Documentation

enum cc_mode

Enumerator
CCMODE_POPON
CCMODE_PAINTON
CCMODE_ROLLUP_2
CCMODE_ROLLUP_3
CCMODE_ROLLUP_4
CCMODE_TEXT

Definition at line 38 of file ccaption_dec.c.

enum cc_color_code

Enumerator
CCCOL_WHITE
CCCOL_GREEN
CCCOL_BLUE
CCCOL_CYAN
CCCOL_RED
CCCOL_YELLOW
CCCOL_MAGENTA
CCCOL_USERDEFINED
CCCOL_BLACK
CCCOL_TRANSPARENT

Definition at line 47 of file ccaption_dec.c.

enum cc_font

Enumerator
CCFONT_REGULAR
CCFONT_ITALICS
CCFONT_UNDERLINED
CCFONT_UNDERLINED_ITALICS

Definition at line 60 of file ccaption_dec.c.

Function Documentation

static av_cold int init_decoder ( AVCodecContext *  avctx )

static

Definition at line 175 of file ccaption_dec.c.

static av_cold int close_decoder ( AVCodecContext *  avctx )

static

Definition at line 196 of file ccaption_dec.c.

static int write_char ( CCaptionSubContext *  ctx, char *  row, uint8_t  col, char  ch  )

static

Parameters

ctx	closed caption context just to print log

Definition at line 207 of file ccaption_dec.c.

Referenced by handle_char(), handle_delete_end_of_row(), handle_pac(), and handle_textattr().

static int validate_cc_data_pair ( uint8_t *  cc_data_pair )

static

This function after validating parity bit, also remove it from data pair.

The first byte doesn't pass parity, we replace it with a solid blank and process the pair. If the second byte doesn't pass parity, it returns INVALIDDATA user can ignore the whole pair and pass the other pair.

Definition at line 231 of file ccaption_dec.c.

Referenced by decode().

static struct Screen* get_writing_screen ( CCaptionSubContext *  ctx )

static

Definition at line 267 of file ccaption_dec.c.

Referenced by handle_char(), handle_delete_end_of_row(), handle_pac(), handle_textattr(), and roll_up().

static void roll_up ( CCaptionSubContext *  ctx )

static

Definition at line 285 of file ccaption_dec.c.

Referenced by process_cc608().

static int reap_screen ( CCaptionSubContext *  ctx, int64_t  pts  )

static

Definition at line 318 of file ccaption_dec.c.

Referenced by handle_edm(), and process_cc608().

static void handle_textattr ( CCaptionSubContext *  ctx, uint8_t  hi, uint8_t  lo  )

static

Definition at line 351 of file ccaption_dec.c.

Referenced by process_cc608().

static void handle_pac ( CCaptionSubContext *  ctx, uint8_t  hi, uint8_t  lo  )

static

Definition at line 370 of file ccaption_dec.c.

Referenced by process_cc608().

static int handle_edm ( CCaptionSubContext *  ctx, int64_t  pts  )

static

Parameters

pts	it is required to set end time

Definition at line 404 of file ccaption_dec.c.

Referenced by handle_eoc(), and process_cc608().

static int handle_eoc ( CCaptionSubContext *  ctx, int64_t  pts  )

static

Definition at line 415 of file ccaption_dec.c.

Referenced by process_cc608().

static void handle_delete_end_of_row ( CCaptionSubContext *  ctx, char  hi, char  lo  )

static

Definition at line 424 of file ccaption_dec.c.

Referenced by process_cc608().

static void handle_char ( CCaptionSubContext *  ctx, char  hi, char  lo, int64_t  pts  )

static

Definition at line 432 of file ccaption_dec.c.

Referenced by process_cc608().

static int process_cc608 ( CCaptionSubContext *  ctx, int64_t  pts, uint8_t  hi, uint8_t  lo  )

static

Definition at line 460 of file ccaption_dec.c.

Referenced by decode().

static int decode ( AVCodecContext *  avctx, void *  data, int *  got_sub, AVPacket *  avpkt  )

static

Examples:

qsvdec.c.

Definition at line 523 of file ccaption_dec.c.

Referenced by frame_alloc(), frame_free(), get_buffer(), get_format(), main(), and show_formats_devices().

Variable Documentation

const unsigned char pac2_attribs[32][3]

static

Definition at line 67 of file ccaption_dec.c.

Referenced by handle_pac(), and handle_textattr().

const uint8_t parity_table[256]

static

Definition at line 105 of file ccaption_dec.c.

Referenced by validate_cc_data_pair().

const AVOption options[]

static

Initial value:

= {
    {NULL}
}

Definition at line 571 of file ccaption_dec.c.

const AVClass ccaption_dec_class

static

Initial value:

= {
    .class_name = "Closed caption Decoder",
    .item_name  = av_default_item_name,
    .option     = options,
    .version    = LIBAVUTIL_VERSION_INT,
}

Definition at line 575 of file ccaption_dec.c.

AVCodec ff_ccaption_decoder

Initial value:

= {
    .name           = "cc_dec",
    .long_name      = NULL_IF_CONFIG_SMALL("Closed Caption (EIA-608 / CEA-708) Decoder"),
    .type           = AVMEDIA_TYPE_SUBTITLE,
    .id             = AV_CODEC_ID_EIA_608,
    .priv_data_size = sizeof(CCaptionSubContext),
    .init           = init_decoder,
    .close          = close_decoder,
    .decode         = decode,
    .priv_class     = &ccaption_dec_class,
}

Definition at line 582 of file ccaption_dec.c.