FFmpeg
Data Structures | Macros | Enumerations | Functions | Variables
ccaption_dec.c File Reference
#include "avcodec.h"
#include "ass.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.
 
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 26 of file ccaption_dec.c.

Referenced by reap_screen().

#define SCREEN_COLUMNS   32

Definition at line 27 of file ccaption_dec.c.

Referenced by roll_up(), and write_char().

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

Definition at line 29 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 30 of file ccaption_dec.c.

Referenced by roll_up().

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

Definition at line 31 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 37 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 46 of file ccaption_dec.c.

enum cc_font
Enumerator:
CCFONT_REGULAR
CCFONT_ITALICS
CCFONT_UNDERLINED
CCFONT_UNDERLINED_ITALICS

Definition at line 59 of file ccaption_dec.c.

Function Documentation

static av_cold int init_decoder ( AVCodecContext *  avctx )
static

Definition at line 174 of file ccaption_dec.c.

static av_cold int close_decoder ( AVCodecContext *  avctx )
static

Definition at line 197 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 208 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 232 of file ccaption_dec.c.

Referenced by decode().

static struct Screen* get_writing_screen ( CCaptionSubContext *  ctx )
staticread

Definition at line 268 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 286 of file ccaption_dec.c.

Referenced by process_cc608().

static int reap_screen ( CCaptionSubContext *  ctx,
int64_t  pts 
)
static

Definition at line 319 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 348 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 367 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 401 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 412 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 421 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 429 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 457 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 520 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 66 of file ccaption_dec.c.

Referenced by handle_pac(), and handle_textattr().

const uint8_t parity_table[256]
static

Definition at line 104 of file ccaption_dec.c.

Referenced by validate_cc_data_pair().

const AVOption options[]
static
Initial value:
= {
{NULL}
}

Definition at line 568 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,
}

Definition at line 572 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"),
.priv_data_size = sizeof(CCaptionSubContext),
.close = close_decoder,
.priv_class = &ccaption_dec_class,
}

Definition at line 579 of file ccaption_dec.c.

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