libzvbi-teletextdec.c File Reference

#include "avcodec.h"
#include "libavcodec/ass.h"
#include "codec_internal.h"
#include "libavcodec/dvbtxt.h"
#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "libavutil/bprint.h"
#include "libavutil/internal.h"
#include "libavutil/log.h"
#include "libavutil/common.h"
#include <libzvbi.h>

Go to the source code of this file.

Data Structures
struct	TeletextPage
struct	TeletextContext

Macros
#define	TEXT_MAXSZ   (25 * (56 + 1) * 4 + 2)
#define	VBI_NB_COLORS   40
#define	VBI_TRANSPARENT_BLACK   8
#define	RGBA(r, g, b, a)
#define	VBI_R(rgba)
#define	VBI_G(rgba)
#define	VBI_B(rgba)
#define	VBI_A(rgba)
#define	MAX_BUFFERED_PAGES   25
#define	BITMAP_CHAR_WIDTH   12
#define	BITMAP_CHAR_HEIGHT   10
#define	MAX_SLICES   64
#define	IS_TXT_SPACE(ch)
#define	OFFSET(x)
#define	SD   AV_OPT_FLAG_SUBTITLE_PARAM | AV_OPT_FLAG_DECODING_PARAM

Functions
static int	my_ass_subtitle_header (AVCodecContext *avctx)
static int	chop_spaces_utf8 (const unsigned char *t, int len)
static void	subtitle_rect_free (AVSubtitleRect **sub_rect)
static char *	create_ass_text (TeletextContext *ctx, const char *text)
static int	gen_sub_text (TeletextContext *ctx, AVSubtitleRect *sub_rect, vbi_page *page, int chop_top)
static void	bprint_color (const char *type, AVBPrint *buf, vbi_page *page, unsigned ci)
static void	get_trim_info (vbi_page *page, vbi_char *row, int *leading, int *trailing, int *olen)
static void	decode_string (vbi_page *page, vbi_char *row, AVBPrint *buf, int start, int end, vbi_color *cur_color, vbi_color *cur_back_color)
static int	gen_sub_ass (TeletextContext *ctx, AVSubtitleRect *sub_rect, vbi_page *page, int chop_top)
static void	fix_transparency (TeletextContext *ctx, AVSubtitleRect *sub_rect, vbi_page *page, int chop_top, int resx, int resy)
static int	gen_sub_bitmap (TeletextContext *ctx, AVSubtitleRect *sub_rect, vbi_page *page, int chop_top)
static void	handler (vbi_event *ev, void *user_data)
static int	slice_to_vbi_lines (TeletextContext *ctx, const uint8_t *buf, int size)
static int	teletext_decode_frame (AVCodecContext *avctx, AVSubtitle *sub, int *got_sub_ptr, const AVPacket *pkt)
static int	teletext_init_decoder (AVCodecContext *avctx)
static int	teletext_close_decoder (AVCodecContext *avctx)
static void	teletext_flush (AVCodecContext *avctx)

Variables
static const AVOption	options []
static const AVClass	teletext_class
const FFCodec	ff_libzvbi_teletext_decoder

Macro Definition Documentation

TEXT_MAXSZ

#define TEXT_MAXSZ   (25 * (56 + 1) * 4 + 2)

Definition at line 34 of file libzvbi-teletextdec.c.

Referenced by gen_sub_text().

VBI_NB_COLORS

#define VBI_NB_COLORS   40

Definition at line 35 of file libzvbi-teletextdec.c.

Referenced by fix_transparency(), and gen_sub_bitmap().

VBI_TRANSPARENT_BLACK

#define VBI_TRANSPARENT_BLACK   8

Definition at line 36 of file libzvbi-teletextdec.c.

Referenced by fix_transparency(), and gen_sub_bitmap().

RGBA

#define RGBA	(		r,
			g,
			b,
			a )

Value:

(((a) << 24) | ((r) << 16) | ((g) << 8) | (b))

Definition at line 37 of file libzvbi-teletextdec.c.

Referenced by gen_sub_bitmap().

VBI_R

#define VBI_R

(

rgba

)

Value:

(((rgba) >> 0) & 0xFF)

Definition at line 38 of file libzvbi-teletextdec.c.

Referenced by bprint_color(), and gen_sub_bitmap().

VBI_G

#define VBI_G

(

rgba

)

Value:

(((rgba) >> 8) & 0xFF)

Definition at line 39 of file libzvbi-teletextdec.c.

Referenced by bprint_color(), and gen_sub_bitmap().

VBI_B

#define VBI_B

(

rgba

)

Value:

(((rgba) >> 16) & 0xFF)

Definition at line 40 of file libzvbi-teletextdec.c.

Referenced by bprint_color(), and gen_sub_bitmap().

VBI_A

#define VBI_A

(

rgba

)

Value:

(((rgba) >> 24) & 0xFF)

Definition at line 41 of file libzvbi-teletextdec.c.

Referenced by gen_sub_bitmap().

MAX_BUFFERED_PAGES

#define MAX_BUFFERED_PAGES   25

Definition at line 42 of file libzvbi-teletextdec.c.

Referenced by handler().

BITMAP_CHAR_WIDTH

#define BITMAP_CHAR_WIDTH   12

Definition at line 43 of file libzvbi-teletextdec.c.

Referenced by fix_transparency(), gen_sub_bitmap(), and teletext_init_decoder().

BITMAP_CHAR_HEIGHT

#define BITMAP_CHAR_HEIGHT   10

Definition at line 44 of file libzvbi-teletextdec.c.

Referenced by fix_transparency(), gen_sub_bitmap(), and teletext_init_decoder().

MAX_SLICES

#define MAX_SLICES   64

Definition at line 45 of file libzvbi-teletextdec.c.

IS_TXT_SPACE

#define IS_TXT_SPACE

(

ch

)

Value:

                          ((ch).unicode < 0x0020 || (ch).unicode >= 0xe000 || (ch).unicode == 0x00a0 ||\
                          (ch).size > VBI_DOUBLE_SIZE || (ch).opacity == VBI_TRANSPARENT_SPACE)

Definition at line 242 of file libzvbi-teletextdec.c.

Referenced by decode_string(), and get_trim_info().

OFFSET

#define OFFSET

(

x

)

Value:

offsetof(TeletextContext, x)

Definition at line 790 of file libzvbi-teletextdec.c.

SD

#define SD   AV_OPT_FLAG_SUBTITLE_PARAM | AV_OPT_FLAG_DECODING_PARAM

Definition at line 791 of file libzvbi-teletextdec.c.

Function Documentation

my_ass_subtitle_header()

static int my_ass_subtitle_header ( AVCodecContext * avctx )

static

Definition at line 85 of file libzvbi-teletextdec.c.

Referenced by teletext_init_decoder().

chop_spaces_utf8()

static int chop_spaces_utf8 ( const unsigned char * t, int len )

static

Definition at line 131 of file libzvbi-teletextdec.c.

Referenced by gen_sub_text().

subtitle_rect_free()

static void subtitle_rect_free ( AVSubtitleRect ** sub_rect )

static

Definition at line 142 of file libzvbi-teletextdec.c.

Referenced by teletext_close_decoder(), and teletext_decode_frame().

create_ass_text()

static char * create_ass_text ( TeletextContext * ctx, const char * text )

static

Definition at line 150 of file libzvbi-teletextdec.c.

Referenced by gen_sub_text().

gen_sub_text()

static int gen_sub_text ( TeletextContext * ctx, AVSubtitleRect * sub_rect, vbi_page * page, int chop_top )

static

Definition at line 167 of file libzvbi-teletextdec.c.

Referenced by handler().

bprint_color()

static void bprint_color ( const char * type, AVBPrint * buf, vbi_page * page, unsigned ci )

static

Definition at line 234 of file libzvbi-teletextdec.c.

Referenced by decode_string().

get_trim_info()

static void get_trim_info ( vbi_page * page, vbi_char * row, int * leading, int * trailing, int * olen )

static

Definition at line 245 of file libzvbi-teletextdec.c.

Referenced by gen_sub_ass().

decode_string()

static void decode_string ( vbi_page * page, vbi_char * row, AVBPrint * buf, int start, int end, vbi_color * cur_color, vbi_color * cur_back_color )

static

Definition at line 265 of file libzvbi-teletextdec.c.

Referenced by gen_sub_ass().

gen_sub_ass()

static int gen_sub_ass ( TeletextContext * ctx, AVSubtitleRect * sub_rect, vbi_page * page, int chop_top )

static

Definition at line 295 of file libzvbi-teletextdec.c.

Referenced by handler().

fix_transparency()

static void fix_transparency ( TeletextContext * ctx, AVSubtitleRect * sub_rect, vbi_page * page, int chop_top, int resx, int resy )

static

Definition at line 412 of file libzvbi-teletextdec.c.

Referenced by gen_sub_bitmap().

gen_sub_bitmap()

static int gen_sub_bitmap ( TeletextContext * ctx, AVSubtitleRect * sub_rect, vbi_page * page, int chop_top )

static

Definition at line 453 of file libzvbi-teletextdec.c.

Referenced by handler().

handler()

static void handler ( vbi_event * ev, void * user_data )

static

Definition at line 510 of file libzvbi-teletextdec.c.

Referenced by avi_read_header(), ff_rdt_parse_open(), ff_rtp_handler_find_by_id(), ff_rtp_handler_find_by_name(), ff_rtp_parse_set_dynamic_protocol(), and teletext_decode_frame().

slice_to_vbi_lines()

static int slice_to_vbi_lines ( TeletextContext * ctx, const uint8_t * buf, int size )

static

Definition at line 586 of file libzvbi-teletextdec.c.

Referenced by teletext_decode_frame().

teletext_decode_frame()

static int teletext_decode_frame ( AVCodecContext * avctx, AVSubtitle * sub, int * got_sub_ptr, const AVPacket * pkt )

static

Definition at line 642 of file libzvbi-teletextdec.c.

teletext_init_decoder()

static int teletext_init_decoder ( AVCodecContext * avctx )

static

Definition at line 728 of file libzvbi-teletextdec.c.

teletext_close_decoder()

static int teletext_close_decoder ( AVCodecContext * avctx )

static

Definition at line 765 of file libzvbi-teletextdec.c.

Referenced by teletext_flush().

teletext_flush()

static void teletext_flush ( AVCodecContext * avctx )

static

Definition at line 785 of file libzvbi-teletextdec.c.

Variable Documentation

options

const AVOption options[]

static

Initial value:

= {
    {"txt_page",        "page numbers to decode, subtitle for subtitles, * for all", OFFSET(pgno),   AV_OPT_TYPE_STRING, {.str = "*"},      0, 0,        SD},
    {"txt_default_region", "default G0 character set used for decoding",     OFFSET(default_region), AV_OPT_TYPE_INT,    {.i64 = -1},      -1, 87,       SD},
    {"txt_chop_top",    "discards the top teletext line",                    OFFSET(chop_top),       AV_OPT_TYPE_INT,    {.i64 = 1},        0, 1,        SD},
    {"txt_format",      "format of the subtitles (bitmap or text or ass)",   OFFSET(format_id),      AV_OPT_TYPE_INT,    {.i64 = 0},        0, 2,        SD,  .unit = "txt_format"},
    {"bitmap",          NULL,                                                0,                      AV_OPT_TYPE_CONST,  {.i64 = 0},        0, 0,        SD,  .unit = "txt_format"},
    {"text",            NULL,                                                0,                      AV_OPT_TYPE_CONST,  {.i64 = 1},        0, 0,        SD,  .unit = "txt_format"},
    {"ass",             NULL,                                                0,                      AV_OPT_TYPE_CONST,  {.i64 = 2},        0, 0,        SD,  .unit = "txt_format"},
    {"txt_left",        "x offset of generated bitmaps",                     OFFSET(x_offset),       AV_OPT_TYPE_INT,    {.i64 = 0},        0, 65535,    SD},
    {"txt_top",         "y offset of generated bitmaps",                     OFFSET(y_offset),       AV_OPT_TYPE_INT,    {.i64 = 0},        0, 65535,    SD},
    {"txt_chop_spaces", "chops leading and trailing spaces from text",       OFFSET(chop_spaces),    AV_OPT_TYPE_INT,    {.i64 = 1},        0, 1,        SD},
    {"txt_duration",    "display duration of teletext pages in msecs",       OFFSET(sub_duration),   AV_OPT_TYPE_INT,    {.i64 = -1},      -1, 86400000, SD},
    {"txt_transparent", "force transparent background of the teletext",      OFFSET(transparent_bg), AV_OPT_TYPE_INT,    {.i64 = 0},        0, 1,        SD},
    {"txt_opacity",     "set opacity of the transparent background",         OFFSET(opacity),        AV_OPT_TYPE_INT,    {.i64 = -1},      -1, 255,      SD},
    { NULL },
}

Definition at line 792 of file libzvbi-teletextdec.c.

teletext_class

const AVClass teletext_class

static

Initial value:

= {
    .class_name = "libzvbi_teletextdec",
    .item_name  = av_default_item_name,
    .option     = options,
    .version    = LIBAVUTIL_VERSION_INT,
}

Definition at line 809 of file libzvbi-teletextdec.c.

ff_libzvbi_teletext_decoder

const FFCodec ff_libzvbi_teletext_decoder

Initial value:

= {
    .p.name         = "libzvbi_teletextdec",
    CODEC_LONG_NAME("Libzvbi DVB teletext decoder"),
    .p.type         = AVMEDIA_TYPE_SUBTITLE,
    .p.id           = AV_CODEC_ID_DVB_TELETEXT,
    .p.capabilities = AV_CODEC_CAP_DELAY,
    .p.priv_class   = &teletext_class,
    .p.wrapper_name = "libzvbi",
    .caps_internal  = FF_CODEC_CAP_NOT_INIT_THREADSAFE,
    .priv_data_size = sizeof(TeletextContext),
    .init      = teletext_init_decoder,
    .close     = teletext_close_decoder,
    FF_CODEC_DECODE_SUB_CB(teletext_decode_frame),
    .flush     = teletext_flush,
}

Definition at line 816 of file libzvbi-teletextdec.c.