libzvbi-teletextdec.c File Reference

#include "avcodec.h"
#include "libavutil/opt.h"
#include "libavutil/intreadwrite.h"
#include <libzvbi.h>

Go to the source code of this file.

Data Structures
struct	TeletextContext

Macros
#define	TEXT_MAXSZ   (25 * (56 + 1) * 4 + 2)
#define	VBI_NB_COLORS   40
#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	OFFSET(x)   offsetof(TeletextContext, x)
#define	SD   AV_OPT_FLAG_SUBTITLE_PARAM | AV_OPT_FLAG_DECODING_PARAM

Functions
static int	chop_spaces_utf8 (const unsigned char *t, int len)
static int	gen_sub_text (TeletextContext *ctx, vbi_page *page, int chop_top)
static void	fix_transparency (TeletextContext *ctx, vbi_page *page, int chop_top, uint8_t transparent_color, int resx, int resy)
static int	gen_sub_bitmap (TeletextContext *ctx, vbi_page *page, int chop_top)
static void	handler (vbi_event *ev, void *user_data)
static int	teletext_decode_frame (AVCodecContext *avctx, void *data, int *data_size, 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

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

Definition at line 27 of file libzvbi-teletextdec.c.

Referenced by gen_sub_text().

#define VBI_NB_COLORS   40

Definition at line 28 of file libzvbi-teletextdec.c.

Referenced by gen_sub_bitmap().

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

Definition at line 29 of file libzvbi-teletextdec.c.

Referenced by gen_sub_bitmap().

#define VBI_R

(

rgba

)

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

Definition at line 30 of file libzvbi-teletextdec.c.

Referenced by gen_sub_bitmap().

#define VBI_G

(

rgba

)

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

Definition at line 31 of file libzvbi-teletextdec.c.

Referenced by gen_sub_bitmap().

#define VBI_B

(

rgba

)

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

Definition at line 32 of file libzvbi-teletextdec.c.

Referenced by gen_sub_bitmap().

#define VBI_A

(

rgba

)

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

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

Referenced by gen_sub_bitmap().

#define OFFSET

(

x

)

offsetof(TeletextContext, x)

Definition at line 437 of file libzvbi-teletextdec.c.

#define SD   AV_OPT_FLAG_SUBTITLE_PARAM | AV_OPT_FLAG_DECODING_PARAM

Definition at line 438 of file libzvbi-teletextdec.c.

Function Documentation

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

static

Definition at line 64 of file libzvbi-teletextdec.c.

Referenced by gen_sub_text().

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

static

Definition at line 77 of file libzvbi-teletextdec.c.

Referenced by handler().

static void fix_transparency ( TeletextContext *  ctx, vbi_page *  page, int  chop_top, uint8_t  transparent_color, int  resx, int  resy  )

static

Definition at line 143 of file libzvbi-teletextdec.c.

Referenced by gen_sub_bitmap().

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

static

Definition at line 176 of file libzvbi-teletextdec.c.

Referenced by handler().

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

static

Definition at line 239 of file libzvbi-teletextdec.c.

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

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

static

Definition at line 300 of file libzvbi-teletextdec.c.

static int teletext_init_decoder ( AVCodecContext *  avctx )

static

Definition at line 384 of file libzvbi-teletextdec.c.

static int teletext_close_decoder ( AVCodecContext *  avctx )

static

Definition at line 417 of file libzvbi-teletextdec.c.

Referenced by teletext_flush().

static void teletext_flush ( AVCodecContext *  avctx )

static

Definition at line 432 of file libzvbi-teletextdec.c.

Variable Documentation

const AVOption options[]

static

Initial value:

= {
    {"txt_page",        "list of teletext page numbers to decode, * is all", OFFSET(pgno),           AV_OPT_TYPE_STRING, {.str = "*"},      0, 0,        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)",          OFFSET(format),         AV_OPT_TYPE_STRING, {.str = "bitmap"}, 0, 0,        SD},
    {"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 = 30000},    0, 86400000, SD},
    {"txt_transparent", "force transparent background of the teletext",      OFFSET(transparent_bg), AV_OPT_TYPE_INT,    {.i64 = 0},        0, 1,        SD},
    { NULL },
}

Definition at line 439 of file libzvbi-teletextdec.c.

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 451 of file libzvbi-teletextdec.c.

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        = CODEC_ID_DVB_TELETEXT,
    .priv_data_size = sizeof(TeletextContext),
    .init      = teletext_init_decoder,
    .close     = teletext_close_decoder,
    .decode    = teletext_decode_frame,
    .flush     = teletext_flush,
    .priv_class= &teletext_class,
}

Definition at line 458 of file libzvbi-teletextdec.c.