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

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

#define	VBI_R(rgba) (((rgba) >> 0) & 0xFF)

#define	VBI_G(rgba) (((rgba) >> 8) & 0xFF)

#define	VBI_B(rgba) (((rgba) >> 16) & 0xFF)

#define	VBI_A(rgba) (((rgba) >> 24) & 0xFF)

#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) offsetof(TeletextContext, 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, uint8_t buf, int size)

static int	teletext_decode_frame (AVCodecContext avctx, void data, int got_sub_ptr, 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

AVCodec	ff_libzvbi_teletext_decoder

Macro Definition Documentation

◆ TEXT_MAXSZ

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

Definition at line 33 of file libzvbi-teletextdec.c.

◆ VBI_NB_COLORS

#define VBI_NB_COLORS 40

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

◆ VBI_TRANSPARENT_BLACK

#define VBI_TRANSPARENT_BLACK 8

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

◆ RGBA

#define RGBA	(	r,
		g,
		b,
		a
	)	(((a) << 24) \| ((r) << 16) \| ((g) << 8) \| (b))

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

◆ VBI_R

#define VBI_R ( rgba ) (((rgba) >> 0) & 0xFF)

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

◆ VBI_G

#define VBI_G ( rgba ) (((rgba) >> 8) & 0xFF)

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

◆ VBI_B

#define VBI_B ( rgba ) (((rgba) >> 16) & 0xFF)

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

◆ VBI_A

#define VBI_A ( rgba ) (((rgba) >> 24) & 0xFF)

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

◆ MAX_BUFFERED_PAGES

#define MAX_BUFFERED_PAGES 25

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

◆ BITMAP_CHAR_WIDTH

#define BITMAP_CHAR_WIDTH 12

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

◆ BITMAP_CHAR_HEIGHT

#define BITMAP_CHAR_HEIGHT 10

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

◆ MAX_SLICES

#define MAX_SLICES 64

Definition at line 44 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 241 of file libzvbi-teletextdec.c.

◆ OFFSET

#define OFFSET ( x ) offsetof(TeletextContext, x)

Definition at line 796 of file libzvbi-teletextdec.c.

◆ SD

#define SD AV_OPT_FLAG_SUBTITLE_PARAM | AV_OPT_FLAG_DECODING_PARAM

Definition at line 797 of file libzvbi-teletextdec.c.

Function Documentation

◆ my_ass_subtitle_header()

static int my_ass_subtitle_header ( AVCodecContext * avctx )

static

Definition at line 84 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 130 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 141 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 149 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 166 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 233 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 244 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 264 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 294 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 411 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 450 of file libzvbi-teletextdec.c.

Referenced by handler().

◆ handler()

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

static

Definition at line 507 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,
		uint8_t *	buf,
		int	size
	)

static

Definition at line 583 of file libzvbi-teletextdec.c.

Referenced by teletext_decode_frame().

◆ teletext_decode_frame()

static int teletext_decode_frame	(	AVCodecContext *	avctx,
		void *	data,
		int *	got_sub_ptr,
		AVPacket *	pkt
	)

static

Definition at line 639 of file libzvbi-teletextdec.c.

◆ teletext_init_decoder()

static int teletext_init_decoder ( AVCodecContext * avctx )

static

Definition at line 734 of file libzvbi-teletextdec.c.

◆ teletext_close_decoder()

static int teletext_close_decoder ( AVCodecContext * avctx )

static

Definition at line 771 of file libzvbi-teletextdec.c.

Referenced by teletext_flush().

◆ teletext_flush()

static void teletext_flush ( AVCodecContext * avctx )

static

Definition at line 791 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,  "txt_format"},
    {"bitmap",          NULL,                                                0,                      AV_OPT_TYPE_CONST,  {.i64 = 0},        0, 0,        SD,  "txt_format"},
    {"text",            NULL,                                                0,                      AV_OPT_TYPE_CONST,  {.i64 = 1},        0, 0,        SD,  "txt_format"},
    {"ass",             NULL,                                                0,                      AV_OPT_TYPE_CONST,  {.i64 = 2},        0, 0,        SD,  "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 798 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 815 of file libzvbi-teletextdec.c.

◆ ff_libzvbi_teletext_decoder

AVCodec ff_libzvbi_teletext_decoder

Initial value:

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

Definition at line 822 of file libzvbi-teletextdec.c.

Data Structures

Macros

Functions

Variables

Macro Definition Documentation

◆ TEXT_MAXSZ

◆ VBI_NB_COLORS

◆ VBI_TRANSPARENT_BLACK

◆ RGBA

◆ VBI_R

◆ VBI_G

◆ VBI_B

◆ VBI_A

◆ MAX_BUFFERED_PAGES

◆ BITMAP_CHAR_WIDTH

◆ BITMAP_CHAR_HEIGHT

◆ MAX_SLICES

◆ IS_TXT_SPACE

◆ OFFSET

◆ SD

Function Documentation

◆ my_ass_subtitle_header()

◆ chop_spaces_utf8()

◆ subtitle_rect_free()

◆ create_ass_text()

◆ gen_sub_text()

◆ bprint_color()

◆ get_trim_info()

◆ decode_string()

◆ gen_sub_ass()

◆ fix_transparency()

◆ gen_sub_bitmap()

◆ handler()

◆ slice_to_vbi_lines()

◆ teletext_decode_frame()

◆ teletext_init_decoder()

◆ teletext_close_decoder()

◆ teletext_flush()

Variable Documentation

◆ options

◆ teletext_class

◆ ff_libzvbi_teletext_decoder