{"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\/da\/blog\/administrirovanie\/izuchaem-voip-dvizhok-mediastreamer2-chast-3","title":{"rendered":"Unders\u00f8ger VoIP-motoren Mediastreamer2. Del 3","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Materialet i artiklen er taget fra min zen-kanal<\/a><\/noindex>.<\/p>\n

<\/p>\n

\"Unders\u00f8ger<\/p>\n

<\/p>\n

Forbedrer eksemplet p\u00e5 en tonal generator<\/h2>\n

<\/p>\n

I den forrige artikel<\/a><\/noindex> Vi har skrevet en applikation til den tonale generator og har med dens hj\u00e6lp udvundet lyd fra computerens h\u00f8jttaler. Nu vil vi fokusere p\u00e5, at vores program, n\u00e5r det afslutter, ikke returnerer hukommelsen tilbage til bunken. Det er tid til at f\u00e5 afklaring omkring dette sp\u00f8rgsm\u00e5l.<\/p>\n

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

Efter at skemaet ikke l\u00e6ngere er n\u00f8dvendigt, skal frig\u00f8relsen af hukommelsen begynde med at stoppe datakanalen. For dette skal kildeklokken til skemaet frakobles ved hj\u00e6lp af funktionen ms_ticker_detach()<\/em>. I vores tilf\u00e6lde skal vi frakoble tikeren fra indgangen til filteret voidsource<\/em>:<\/p>\n

<\/p>\n

ms_ticker_detach(ticker, voidsource)<\/code><\/pre>\n
<\/p>\n
For \u00f8vrigt kan vi efter at have stoppet kanalen \u00e6ndre dens skema og genoptage arbejdet ved at tilslutte tikeren igen.<\/p>\n
<\/p>\n
Nu kan vi slette den ved hj\u00e6lp af funktionen ms_ticker_destroy()<\/em>:<\/p>\n
<\/p>\n
ms_ticker_destroy(ticker)<\/code><\/pre>\n
<\/p>\n
Kanalen er stoppet, og vi kan begynde at nedbryde dens dele, ved at frakoble filtrene. Dette g\u00f8res ved hj\u00e6lp af 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
Argumenternes form\u00e5l er det samme som for funktionen ms_filter_link()<\/em>.<\/p>\n
<\/p>\n
Sletter nu de frakoblede filtre ved hj\u00e6lp af 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
Ved at tilf\u00f8je disse linjer til vores eksempel vil vi opn\u00e5 en korrekt afslutning af programmet med hensyn til hukommelsesstyring.<\/p>\n
<\/p>\n
Som vi kan se, kr\u00e6vede en korrekt afslutning af programmet, at vi tilf\u00f8jede cirka det samme antal kodelinjer som i dens begyndelse, og i gennemsnit var der fire linjer kode pr. filter. Det viser sig, at st\u00f8rrelsen p\u00e5 programmets kode vil vokse proportionelt med antallet af filtre, der anvendes i projektet. Hvis vi taler om tusinde filtre i skemaet, s\u00e5 vil dine kodelinjer blive tilf\u00f8jet med fire tusinde linjer rutinem\u00e6ssige operationer til oprettelse og destruktion.<\/p>\n
<\/p>\n
Nu ved du, hvordan man korrekt afslutter et program, der bruger en mediestr\u00f8mmer. I de f\u00f8lgende eksempler vil jeg for kompakthedens skyld "glemme" at g\u00f8re dette. Men du glemmer det ikke?<\/p>\n
<\/p>\n
Udviklerne af mediestreameren har ikke forudset softwarev\u00e6rkt\u00f8jer til at lette manipulationen af filtre under samling\/nedrivning af skemaer. Ikke desto mindre er der en helper, der hurtigt giver mulighed for at inds\u00e6tte\/fjerne et filter fra skemaet.<\/p>\n
<\/p>\n
Vi vender tilbage til at l\u00f8se dette sp\u00f8rgsm\u00e5l senere, n\u00e5r antallet af filtre i vores eksempler overstiger et par dusin.<\/p>\n
<\/p>\n
I n\u00e6ste artikel<\/a><\/noindex> Vi vil samle et signalniveau-m\u00e5leinstrument og l\u00e6re at afl\u00e6se m\u00e5leresultatet fra filteret. Vi vil vurdere m\u00e5lingsn\u00f8jagtigheden.<\/p>\n
Kilde: habr.com<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"
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