EBU Teletext driver. More...

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <techtype.h>
#include <dbgfuncs.h>
#include <stbhwmem.h>
#include "stbebutt.h"
#include "stbhwos.h"
#include "stbheap.h"
#include "stbpes.h"
#include "stbhwosd.h"
#include "stbdpc.h"
#include "stbhwav.h"

Macros
#define	_STBEBUTT_C

#define	COLLATION_QUEUE_SIZE 400

#define	SD_WIDTH 720

#define	SD_HEIGHT 576

#define	EBU_DBG(x)

#define	EBU_PRINT(x,...)

#define	EBU_TPRINT(x,...)

#define	PES_DATA_FIELD_WIDTH 46

#define	HAMMING_8_4_DATA_MASK 0x000f

#define	HAMMING_CORRECTION_MASK 0x03f0

#define	HAMMING_ERROR_MASK 0xfc00

#define	HAMMING_CORRECTION_COUNT(a) ((a & HAMMING_CORRECTION_MASK) >> 4)

#define	HAMMING_ERROR_COUNT(a) ((a & HAMMING_ERROR_MASK) >> 10)

#define	COLLATION_TASK_PRIORITY 10

#define	COLLATION_TASK_STACK_SIZE 4096

#define	DISPLAY_TASK_PRIORITY 10

#define	DISPLAY_TASK_STACK_SIZE 4096

#define	CACHE_PAGE_NUMBER_MASK 0x0fff

#define	CACHE_PAGE_FLOF_REQUESTED 0x8000

#define	CACHE_PAGE_HISTORY_REQUESTED 0x4000

#define	CACHE_PAGE_PREVNEXT_REQUESTED 0x2000

#define	CACHE_PAGE_LOCKED 0x1000

#define	PAGE_SUB_CODE_UNDEFINED 0xffff

#define	MAX_HISTORY_CACHE_REQUESTS 32

#define	MAX_EDITORIAL_LINKS 6

#define	MAX_EDITORIAL_LINK_TIERS 5

#define	NUM_NEXT_CACHE_REQUESTS 16

#define	NUM_PREVIOUS_CACHE_REQUESTS 8

#define	INVALID_PREVNEXT_CACHE_PAGE_NUMBER 0x1000

#define	MAX_PAGE_HISTORY 32

#define	PALETTE_BACKGROUND_TRANSPARENT 0

#define	PALETTE_BACKGROUND_BLACK_FIXED 1

#define	PALETTE_BACKGROUND_BLACK 2

#define	PALETTE_BACKGROUND_RED 3

#define	PALETTE_BACKGROUND_GREEN 4

#define	PALETTE_BACKGROUND_YELLOW 5

#define	PALETTE_BACKGROUND_BLUE 6

#define	PALETTE_BACKGROUND_MAGENTA 7

#define	PALETTE_BACKGROUND_CYAN 8

#define	PALETTE_BACKGROUND_WHITE 9

#define	PALETTE_FOREGROUND_BLACK 10

#define	PALETTE_FOREGROUND_RED 11

#define	PALETTE_FOREGROUND_GREEN 12

#define	PALETTE_FOREGROUND_YELLOW 13

#define	PALETTE_FOREGROUND_BLUE 14

#define	PALETTE_FOREGROUND_MAGENTA 15

#define	PALETTE_FOREGROUND_CYAN 16

#define	PALETTE_FOREGROUND_WHITE 17

#define	PALETTE_FOREGROUND_UNBOXED 0

#define	PALETTE_EFFECT_ORIGIN 18

#define	NUM_PALETTE_EFFECTS (256 - PALETTE_EFFECT_ORIGIN)

#define	PALETTE_EFFECT_FLASH 0x01

#define	PALETTE_EFFECT_CONCEAL 0x02

#define	PALETTE_EFFECT_UNDEFINED 0

#define	FONT_INDEX_LATIN_G0_SET 0

#define	FONT_INDEX_LATIN_G2_SUPPLIMENTARY_SET 1

#define	FONT_INDEX_CYRILLIC_G0_SET_OPTION_1_SERBIAN_CROATIAN 2

#define	FONT_INDEX_CYRILLIC_G0_SET_OPTION_2_RUSSIAN_BULGARIAN 3

#define	FONT_INDEX_CYRILLIC_G0_SET_OPTION_3_UKRANIAN 4

#define	FONT_INDEX_CYRILLIC_G2_SUPPLIMENTARY_SET 5

#define	FONT_INDEX_GREEK_G0_SET 6

#define	FONT_INDEX_GREEK_G2_SUPPLIMENTARY_SET 7

#define	FONT_INDEX_ARABIC_G0_SET 8

#define	FONT_INDEX_ARABIC_G2_SUPPLIMENTARY_SET 9

#define	FONT_INDEX_HEBREW_G0_SET 10

#define	FONT_INDEX_G1_BLOCK_MOSAICS_SET 11

#define	FONT_INDEX_G3_SMOOTH_MOSAICS_LINE_DRAWING_SET 12

#define	FONT_INDEX_UNDEFINED 13

#define	FONT_INDEX_NATIONAL_OPTION_SUBSET 14

#define	FONT_INDEX_NO_BITMAP 15

#define	NATIONALITY_INDEX_CZECH_SLOVAK 0

#define	NATIONALITY_INDEX_ENGLISH 1

#define	NATIONALITY_INDEX_ESTONIAN 2

#define	NATIONALITY_INDEX_FRENCH 3

#define	NATIONALITY_INDEX_GERMAN 4

#define	NATIONALITY_INDEX_ITALIAN 5

#define	NATIONALITY_INDEX_LETTISH_LITHUANIAN 6

#define	NATIONALITY_INDEX_POLISH 7

#define	NATIONALITY_INDEX_PORTUGUESE_SPANISH 8

#define	NATIONALITY_INDEX_RUMANIAN 9

#define	NATIONALITY_INDEX_SERB_CROAT_SLOVENIAN 10

#define	NATIONALITY_INDEX_SWEDISH_FINNISH 11

#define	NATIONALITY_INDEX_TURKISH 12

#define	NATIONALITY_INDEX_UNDEFINED 13

#define	TELETEXT_CHARACTER_FONT_INDEX_MASK 0x0f00

#define	TELETEXT_CHARACTER_BITMAP_INDEX_MASK 0x00ff

#define	TELETEXT_CHARACTER_DOUBLE_HEIGHT 0x8000

#define	TELETEXT_CHARACTER_SEPERATED_MOSAIC 0x4000

#define	MAX_DISPLAY_ZOOM_SCALAR 2

#define	MAX_COLUMN 40

#define	MAX_ROWS 25

#define	display_x_scalar 1

#define	display_y_scalar 2

#define	SUBTITLE_TIMEOUT 5000 /5 secs/

Typedefs
typedef enum e_page_control_state	E_PAGE_CONTROL_STATE

typedef enum e_request_type	E_REQUEST_TYPE

typedef enum E_PAGE_INDEX_DIGIT	E_PAGE_INDEX_DIGIT

typedef enum e_page_scale_status	E_PAGE_SCALE_STATUS

typedef enum e_page_reference_type	E_PAGE_REFERENCE_TYPE

typedef struct s_page_control_info	S_PAGE_CONTROL_INFO

typedef struct s_page_request_info	S_PAGE_REQUEST_INFO

typedef struct s_packet_validation	S_PACKET_VALIDATION

typedef struct s_specific_data	S_SPECIFIC_DATA

typedef struct s_magazine_page	S_MAGAZINE_PAGE

typedef struct s_cache_subpage	S_CACHE_SUBPAGE

typedef struct s_cache_page	S_CACHE_PAGE

typedef struct s_magazine_info	S_MAGAZINE_INFO

typedef struct s_page_reference_data	S_PAGE_REFERENCE_DATA

typedef struct s_history_cache_request	S_HISTORY_CACHE_REQUEST

typedef struct s_editorial_link_cache_request_sub_page	S_EDITORIAL_LINK_CACHE_REQUEST_SUB_PAGE

typedef struct s_editorial_link_cache_request	S_EDITORIAL_LINK_CACHE_REQUEST

typedef struct s_teletext_character	S_TELETEXT_CHARACTER

typedef struct s_palette_attribute	S_PALETTE_ATTRIBUTE

typedef struct s_palette_alias	S_PALETTE_ALIAS

typedef struct s_page_display_info	S_PAGE_DISPLAY_INFO

typedef struct s_character_set_mapping	S_CHARACTER_SET_MAPPING

typedef struct s_diacritic_equivalent	S_DIACRITIC_EQUIVALENT

typedef struct s_diacritic_substitution	S_DIACRITIC_SUBSTITUTION

typedef struct s_collation_queue_item	S_COLLATION_QUEUE_ITEM

Enumerations
enum	e_page_control_state { PAGE_CONTROL_STATE_IDLE, PAGE_CONTROL_STATE_INPUT, PAGE_CONTROL_STATE_HOLD }

enum	e_request_type { REQUEST_TYPE_UNDEFINED = 0, REQUEST_TYPE_EXPLICIT, REQUEST_TYPE_INDEX, REQUEST_TYPE_NEXT_PREV_AVAILABLE, REQUEST_TYPE_NEXT_PREV_VISITED, REQUEST_TYPE_NEXT_PREV_SUB, REQUEST_TYPE_EDITORIAL_LINK, REQUEST_TYPE_CANCEL }

enum	E_PAGE_INDEX_DIGIT { PAGE_INDEX_DIGIT_0, PAGE_INDEX_DIGIT_1, PAGE_INDEX_DIGIT_2, PAGE_INDEX_DIGIT_3, PAGE_INDEX_DIGIT_4, PAGE_INDEX_DIGIT_5, PAGE_INDEX_DIGIT_6, PAGE_INDEX_DIGIT_7, PAGE_INDEX_DIGIT_8, PAGE_INDEX_DIGIT_9, PAGE_INDEX_DIGIT_A, PAGE_INDEX_DIGIT_B, PAGE_INDEX_DIGIT_C, PAGE_INDEX_DIGIT_D, PAGE_INDEX_DIGIT_E, PAGE_INDEX_DIGIT_F, PAGE_INDEX_DIGIT_UNDEFINED }

enum	e_page_scale_status { PAGE_SCALE_STATUS_NORMAL = 0, PAGE_SCALE_STATUS_ZOOM_TOP, PAGE_SCALE_STATUS_ZOOM_BOTTOM }

enum	e_page_reference_type { PAGE_REFERENCE_TYPE_HEADER, PAGE_REFERENCE_TYPE_EDITORIAL_LINK, PAGE_REFERENCE_TYPE_GLOBAL_INDEX }

Functions
BOOLEAN	PerformPESCollation (U8BIT data_ptr, BOOLEAN pts_valid, U8BIT pts)
	This process is called to service the queue populated with Teletext packets by the PES collectiom callback. Here the process of analysing each data packet, and grouping these packets into whole page data blocks is perfomred,. More...

BOOLEAN	STB_EBUTT_Initialise (void)
	This must be called to invoke the EBU TeleText driver module before all other functionality can be accessed. This initiates the relevant resources used by the driver module. As a consequence of calling this function, no TeleText processing will occur until other functions are called. It is envisaged that this function may be called within the general initialisation of the STB layer. More...

void	STB_EBUTT_Kill (U8BIT path)
	This is the accompanying function to STB_EBUTT_Initialise( ), and is called to shut-down the EBU TeleText driver module and release the relevant resources used by the driver module. This may not be used in some implementations. More...

BOOLEAN	STB_EBUTT_InjectData (U8BIT *data_ptr, U32BIT data_length)
	Allows teletext PES data packets to be injected by an external module, which will be decoded and displayed. More...

void	STB_EBUTT_Start (U8BIT path, U16BIT text_pid, U8BIT magazine, U8BIT page)
	These functions are called to control whether received TeleText data is processed. Using this functionality ensures that the process of collating page information can be halted when processing resources are a consideration. It is envisaged that some implementations may wish only to collate TeleText content only when the display is being shown, whilst other designs may which to cache significant page content as a background process. Abstracting this functionality from the initialisation routines gives the option to support both solution types. More...

void	STB_EBUTT_Stop (U8BIT path, BOOLEAN reset_cache)

BOOLEAN	STB_EBUTT_Show (E_EBUTT_CHARACTER_SET_DESIGNATION character_set_designation, BOOLEAN navigate_to_index_page, BOOLEAN show_header)
	Called to initiate continuous display of TeleText page content. This will result in either the index page defined in the service data stream being selected, or the previously displayed page (prior to a call to STB_EBUTT_Hide( ) being made) from being reinstated. This function can be called irrespective of the use of the STB_EBUTT_Start( ) / STB_EBUTT_Stop( ) functions, but of course may result in no TeleText data being displayed if none already exists within the cache. The return value indicates whether initialisation of the display mechanism has been successful or not. More...

void	STB_EBUTT_Hide (void)
	Called to halt the continuous display of TeleText page content, and to clear the relevant area of the application display.

void	STB_EBUTT_SetCacheMethod (E_EBUTT_CACHING_METHOD ebutt_caching_method)
	Called to define the strategy used to determine what page content is to be displayed form the TeleText carousel content. More...

void	STB_EBUTT_NotifyEvent (E_EBUTT_EVENT event_type)
	Called whenever a TeleText-specific event being invoked. This is used to pass relevant user input to the driver, and the enumerate type supplied is defined independently of any IR handset / keypad. More...

void	STB_EBUTT_NotifyServiceChange (void)
	Called whenever the application permits a TV/Radio service change during a TeleText display session. This is provided because an update of the display to new page content is required.

void	STB_EBUTT_SetDisplayBrightness (U8BIT gun_intensity)
	Called to adjust the display brightness (colour intensity) of the Teletext pages. More...

void	STB_EBUTT_IncreaseDisplayBrightness (void)
	Called to adjust the display brightness (colour intensity) of the Teletext pages.

void	STB_EBUTT_DecreaseDisplayBrightness (void)

void	STB_EBUTT_SetDisplayAntiAliasing (U8BIT antialias_level)
	Called to adjust the display anti-aliasing level of the Teletext pages. This is used to control 'flicker' on TV displays. More...

void	STB_EBUTT_IncreaseDisplayAntiAliasing (void)
	Called to adjust the display anti-aliasing level of the Teletext pages.

void	STB_EBUTT_DecreaseDisplayAntiAliasing (void)

void	STB_EBUTT_SetDisplayMixTransparency (U8BIT transparency_level)
	Called to adjust the display video-mix transparency level of the Teletext pages. More...

void	STB_EBUTT_IncreaseDisplayMixTransparency (void)
	Called to adjust the display video-mix transparency level of the Teletext pages.

void	STB_EBUTT_DecreaseDisplayMixTransparency (void)

BOOLEAN	STB_EBUTT_IsDisplayHeld (void)
	Called to ascertain whether the present page is in 'hold' mode or not. Thus function is useful when allocating handet keys to events on the basis of the current functional state of the Teletext driver. More...

BOOLEAN	STB_EBUTT_IsDisplayDoubleHeight (void)
	Called to ascertain whether the present page is in 'double height' mode or not. Thus function is useful when allocating handet keys to events on the basis of the current functional state of the Teletext driver. More...

Detailed Description

EBU Teletext driver.

Date: 04/02/2004

Author: Ocean Blue

Function Documentation

BOOLEAN PerformPESCollation	(	U8BIT *	data_ptr,
		BOOLEAN	pts_valid,
		U8BIT *	pts
	)

This process is called to service the queue populated with Teletext packets by the PES collectiom callback. Here the process of analysing each data packet, and grouping these packets into whole page data blocks is perfomred,.

Returns: TRUE if a PES packet was avaiable on the colleation queue (and has subsequently been processed, FALSE if no data was avaiable.

BOOLEAN STB_EBUTT_Initialise ( void )

This must be called to invoke the EBU TeleText driver module before all other functionality can be accessed. This initiates the relevant resources used by the driver module. As a consequence of calling this function, no TeleText processing will occur until other functions are called. It is envisaged that this function may be called within the general initialisation of the STB layer.

Returns: TRUE if initialisation was successful, FALSE otherwise.

BOOLEAN STB_EBUTT_InjectData	(	U8BIT *	data_ptr,
		U32BIT	data_length
	)

Allows teletext PES data packets to be injected by an external module, which will be decoded and displayed.

Parameters

data_ptr	- pointer to first whole PES packet data
data_length	- number of bytes of data provided

Returns: TRUE if the data is valid EBU teletext PES data, FALSE otherwise

BOOLEAN STB_EBUTT_IsDisplayDoubleHeight ( void )

Called to ascertain whether the present page is in 'double height' mode or not. Thus function is useful when allocating handet keys to events on the basis of the current functional state of the Teletext driver.

Returns: TRUE if the displayed page is double height, FALSE otherwise.

BOOLEAN STB_EBUTT_IsDisplayHeld ( void )

Called to ascertain whether the present page is in 'hold' mode or not. Thus function is useful when allocating handet keys to events on the basis of the current functional state of the Teletext driver.

Returns: TRUE if the displayed page is held, FALSE otherwise.

void STB_EBUTT_Kill ( U8BIT path )

This is the accompanying function to STB_EBUTT_Initialise( ), and is called to shut-down the EBU TeleText driver module and release the relevant resources used by the driver module. This may not be used in some implementations.

Parameters

U8BIT path - the path of where to kill teletext.

void STB_EBUTT_NotifyEvent ( E_EBUTT_EVENT event_type )

Called whenever a TeleText-specific event being invoked. This is used to pass relevant user input to the driver, and the enumerate type supplied is defined independently of any IR handset / keypad.

Parameters

E_EBUTT_EVENT event_type -

void STB_EBUTT_SetCacheMethod ( E_EBUTT_CACHING_METHOD ebutt_caching_method )

Called to define the strategy used to determine what page content is to be displayed form the TeleText carousel content.

Parameters

E_EBUTT_CACHING_METHOD ebutt_caching_method -

void STB_EBUTT_SetDisplayAntiAliasing ( U8BIT antialias_level )

Called to adjust the display anti-aliasing level of the Teletext pages. This is used to control 'flicker' on TV displays.

Parameters

U8BIT antialias_level - a factor between zero (no anti-alaising) to 8 (full anti-aliasing)

void STB_EBUTT_SetDisplayBrightness ( U8BIT gun_intensity )

Called to adjust the display brightness (colour intensity) of the Teletext pages.

Parameters

U8BIT gun_intensity - a RGB gun intensity, ranging from 255 (brightest) to 127 (darkest)

void STB_EBUTT_SetDisplayMixTransparency ( U8BIT transparency_level )

Called to adjust the display video-mix transparency level of the Teletext pages.

Parameters

U8BIT transparency_level - a factor between zero (no transparency) to 255 (full transparency)

BOOLEAN STB_EBUTT_Show	(	E_EBUTT_CHARACTER_SET_DESIGNATION	character_set_designation,
		BOOLEAN	navigate_to_index_page,
		BOOLEAN	show_header
	)

Called to initiate continuous display of TeleText page content. This will result in either the index page defined in the service data stream being selected, or the previously displayed page (prior to a call to STB_EBUTT_Hide( ) being made) from being reinstated. This function can be called irrespective of the use of the STB_EBUTT_Start( ) / STB_EBUTT_Stop( ) functions, but of course may result in no TeleText data being displayed if none already exists within the cache. The return value indicates whether initialisation of the display mechanism has been successful or not.

Parameters

E_STB_EBUTT_CHARACTER_SET_DESIGNATION	character_set_designation - used to specifiy the default character set designation for a level 1.0 Teletext broadcast. This is useful to configure the implementation to work correctly when used with regionalised broadcasts.
BOOLEAN	navigate_to_index_page - set it TRUE if the index page defined within the Teletext service is used, or the last visited page is re-displayed.

Returns: TRUE if initialisation of diaply mechanism was successful, FALSE otherwise.

void STB_EBUTT_Start	(	U8BIT	path,
		U16BIT	text_pid,
		U8BIT	magazine,
		U8BIT	page
	)

These functions are called to control whether received TeleText data is processed. Using this functionality ensures that the process of collating page information can be halted when processing resources are a consideration. It is envisaged that some implementations may wish only to collate TeleText content only when the display is being shown, whilst other designs may which to cache significant page content as a background process. Abstracting this functionality from the initialisation routines gives the option to support both solution types.

Parameters

magazine - initial magazine to be loaded page - initial page to show from the magazine

Macros

Typedefs

Enumerations

Functions

Detailed Description

Function Documentation