ZVBI Library
0.2.35
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Modules | |
Search | |
Search the Teletext page cache. | |
Functions | |
void | vbi_unref_page (vbi_page *pg) |
int | vbi_is_cached (vbi_decoder *, int pgno, int subno) |
int | vbi_cache_hi_subno (vbi_decoder *vbi, int pgno) |
vbi_bool | vbi_fetch_cc_page (vbi_decoder *vbi, vbi_page *pg, vbi_pgno pgno, vbi_bool reset) |
void vbi_unref_page | ( | vbi_page * | pg | ) |
pg | Previously fetched vbi_page. |
A vbi_page fetched from cache with vbi_fetch_vt_page() or vbi_fetch_cc_page() may reference other resource in cache which are locked after fetching. When done processing the page, you must call this function to unlock all the resources associated with this vbi_page.
References ttx_page_stat::n_subpages, ttx_page_stat::page_type, ttx_page_stat::subno_min, vbi_bcd_digits_greater(), vbi_is_bcd(), and vbi_log_on_stderr().
int vbi_is_cached | ( | vbi_decoder * | vbi, |
int | pgno, | ||
int | subno | ||
) |
vbi | |
pgno | |
subno |
TRUE
if the given page is cached. int vbi_cache_hi_subno | ( | vbi_decoder * | vbi, |
int | pgno | ||
) |
vbi | |
pgno |
vbi_bool vbi_fetch_cc_page | ( | vbi_decoder * | vbi, |
vbi_page * | pg, | ||
vbi_pgno | pgno, | ||
vbi_bool | reset | ||
) |
vbi | Initialized vbi decoding context. |
pg | Place to store the formatted page. |
pgno | Page number 1 ... 8 of the page to fetch, see vbi_pgno. |
reset | TRUE resets the vbi_page dirty fields in cache after fetching. Pass FALSE only if you plan to call this function again to update other displays. |
Fetches a Closed Caption page designated by pgno from the cache, formats and stores it in pg. CC pages are transmitted basically in two modes: at once and character by character ("roll-up" mode). Either way you get a snapshot of the page as it should appear on screen at present. With vbi_event_handler_add() you can request a VBI_EVENT_CAPTION
event to be notified about pending changes (in case of "roll-up" mode that is with each new word received) and the vbi_page->dirty fields will mark the lines actually in need of updates, to speed up rendering.
Although safe to do, this function is not supposed to be called from an event handler, since rendering may block decoding for extended periods of time.
FALSE
if some error occured. References vbi_page::dirty.