{"id":87065,"date":"2020-07-03T07:42:01","date_gmt":"2020-07-03T05:42:01","guid":{"rendered":"https:\/\/prohoster.info\/blog\/administrirovanie\/izuchaem-voip-dvizhok-mediastreamer2-chast-3"},"modified":"2020-07-03T07:42:01","modified_gmt":"2020-07-03T05:42:01","slug":"izuchaem-voip-dvizhok-mediastreamer2-chast-3","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sv\/blog\/administrirovanie\/izuchaem-voip-dvizhok-mediastreamer2-chast-3","title":{"rendered":"Vi studerar VoIP-motorn Mediastreamer2. Del 3","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Artikelmaterialet \u00e4r h\u00e4mtat fr\u00e5n min Zen-kanal<\/a><\/noindex>.<\/p>\n

<\/p>\n

\"Vi<\/p>\n

<\/p>\n

F\u00f6rb\u00e4ttring av exempel p\u00e5 tongenerator<\/h2>\n

<\/p>\n

I f\u00f6reg\u00e5ende artikeln<\/a><\/noindex> Vi har skrivit en applikation f\u00f6r tongeneratorn och med den har vi extraherat ljud fr\u00e5n datorns h\u00f6gtalare. Nu ska vi uppm\u00e4rksamma att v\u00e5rt program, n\u00e4r det avslutar arbetet, inte \u00e5terl\u00e4mnar minnet tillbaka till h\u00f6gen. Det \u00e4r dags att klarg\u00f6ra denna fr\u00e5ga.<\/p>\n

<\/a><\/noindex><\/p>\n

N\u00e4r schemat inte l\u00e4ngre beh\u00f6vs, b\u00f6r minnesfrig\u00f6ringen b\u00f6rja med att stoppa datapipeline. F\u00f6r detta beh\u00f6ver vi koppla bort klockk\u00e4llan fr\u00e5n schemat via funktionen ms_ticker_detach()<\/em>. I v\u00e5rt fall m\u00e5ste vi koppla bort tickern fr\u00e5n ing\u00e5ngen till filtret voidsource<\/em>:<\/p>\n

<\/p>\n

ms_ticker_detach(ticker, voidsource)<\/code><\/pre>\n
<\/p>\n
F\u00f6rresten, efter att pipelinen har stoppats kan vi \u00e4ndra dess schema och \u00e5teruppta arbetet genom att \u00e5teransluta tickern.<\/p>\n
<\/p>\n
Nu kan vi radera den med hj\u00e4lp av funktionen ms_ticker_destroy()<\/em>:<\/p>\n
<\/p>\n
ms_ticker_destroy(ticker)<\/code><\/pre>\n
<\/p>\n
Pipelinen \u00e4r stoppad och vi kan b\u00f6rja demontera dess delar genom att koppla bort filtren. F\u00f6r detta anv\u00e4nds funktionen ms_filter_unlink()<\/em>:<\/p>\n
<\/p>\n
ms_filter_unlink(voidsource, 0, dtmfgen, 0);\nms_filter_unlink(dtmfgen, 0, snd_card_write, 0);<\/code><\/pre>\n
<\/p>\n
Argumentens avsedda syfte \u00e4r detsamma som f\u00f6r funktionen ms_filter_link()<\/em>.<\/p>\n
<\/p>\n
Vi tar nu bort de redan avkopplade filtren med hj\u00e4lp av ms_filter_destroy()<\/em>:<\/p>\n
<\/p>\n
ms_filter_destroy(voidsource);\nms_filter_destroy(dtmfgen);\nms_filter_destroy(snd_card_write);<\/code><\/pre>\n
<\/p>\n
Genom att l\u00e4gga till dessa rader i v\u00e5rt exempel f\u00e5r vi en korrekt avslutning av programmet n\u00e4r det g\u00e4ller minneshantering.<\/p>\n
<\/p>\n
Som vi ser kr\u00e4vde en korrekt avslutning av programmet att vi lade till ungef\u00e4r lika m\u00e5nga rader kod som i b\u00f6rjan, d\u00e4r medel kan vi r\u00e4kna med fyra rader kod f\u00f6r varje filter. Detta inneb\u00e4r att storleken p\u00e5 programmets kod \u00f6kar proportionellt mot antalet filter som anv\u00e4nds i projektet. Om vi pratar om tusen filter i schemat, kommer din kod att f\u00e5 fyra tusen extra rader rutinoperationer f\u00f6r skapande och f\u00f6rst\u00f6ring.<\/p>\n
<\/p>\n
Nu vet du hur du korrekt avslutar ett program som anv\u00e4nder en mediestr\u00f6mmare. I de f\u00f6ljande exemplen, f\u00f6r att h\u00e5lla det kort och koncist, kommer jag att \"gl\u00f6mma\" att g\u00f6ra det. Men det kommer inte ni att g\u00f6ra?<\/p>\n
<\/p>\n
Utvecklarna av mediestr\u00f6mmare har inte f\u00f6rutsett programvaror f\u00f6r att underl\u00e4tta hanteringen av filter vid montering\/demontering av scheman. \u00c4nd\u00e5 finns det en hj\u00e4lpfunktion som snabbt l\u00e5ter en infoga\/ta bort filter fr\u00e5n schemat.<\/p>\n
<\/p>\n
Vi \u00e5terkommer till att l\u00f6sa denna fr\u00e5ga senare n\u00e4r antalet filter i v\u00e5ra exempel \u00f6verstiger ett par dussin.<\/p>\n
<\/p>\n
I n\u00e4sta artikeln<\/a><\/noindex> Vi kommer att samla in ett schema f\u00f6r signalniv\u00e5m\u00e4taren och l\u00e4ra oss hur man l\u00e4ser av m\u00e4tresultatet fr\u00e5n filtret. Vi bed\u00f6mer m\u00e4tprecisionen.<\/p>\n
K\u00e4lla: habr.com<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"
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