{"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\/cs\/blog\/administrirovanie\/izuchaem-voip-dvizhok-mediastreamer2-chast-3","title":{"rendered":"Studujeme VoIP engine Mediastreamer2. \u010c\u00e1st 3","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Materi\u00e1l \u010dl\u00e1nku je p\u0159evzat z m\u00e9ho zenov\u00e9ho kan\u00e1lu<\/a><\/noindex>.<\/p>\n

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\"Studujeme<\/p>\n

<\/p>\n

Zlep\u0161ujeme p\u0159\u00edklad t\u00f3nov\u00e9ho gener\u00e1toru<\/h2>\n

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V p\u0159edchoz\u00edm \u010dl\u00e1nku<\/a><\/noindex> jsme napsali aplikaci t\u00f3nov\u00e9ho gener\u00e1toru a pomoc\u00ed n\u00ed jsme extrahovali zvuk z po\u010d\u00edta\u010dov\u00e9ho reproduktoru. Nyn\u00ed se zam\u011b\u0159\u00edme na to, \u017ee na\u0161e aplikace p\u0159i ukon\u010den\u00ed nevrac\u00ed pam\u011b\u0165 zp\u011bt do haldy. Je \u010das objasnit tuto situaci.<\/p>\n

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

Jakmile sch\u00e9ma p\u0159estane b\u00fdt pot\u0159eba, uvoln\u011bn\u00ed pam\u011bti by m\u011blo za\u010d\u00edt zastaven\u00edm datov\u00e9ho kan\u00e1lu. K tomu je t\u0159eba od sch\u00e9matu odpojit zdroj taktov\u00e1n\u00ed, ticker, pomoc\u00ed funkce ms_ticker_detach()<\/em>. V na\u0161em p\u0159\u00edpad\u011b mus\u00edme odpojit ticker od vstupu filtru voidsource<\/em>:<\/p>\n

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ms_ticker_detach(ticker, voidsource)<\/code><\/pre>\n
<\/p>\n
Mimochodem, po zastaven\u00ed kan\u00e1lu m\u016f\u017eeme zm\u011bnit jeho sch\u00e9ma a znovu ho uv\u00e9st do provozu t\u00edm, \u017ee op\u011bt p\u0159ipoj\u00edme ticker.<\/p>\n
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Te\u010f ho m\u016f\u017eeme odstranit pomoc\u00ed funkce ms_ticker_destroy()<\/em>:<\/p>\n
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ms_ticker_destroy(ticker)<\/code><\/pre>\n
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Kan\u00e1l je zastaven a m\u016f\u017eeme za\u010d\u00edt rozeb\u00edrat jeho \u010d\u00e1sti, odd\u011blen\u00edm filtr\u016f. K tomu se pou\u017e\u00edv\u00e1 funkce 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
\u00fa\u010del argument\u016f je stejn\u00fd jako u funkce ms_filter_link()<\/em>.<\/p>\n
<\/p>\n
Odstra\u0148ujeme nyn\u00ed ji\u017e odd\u011blen\u00e9 filtry pomoc\u00ed 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
P\u0159id\u00e1n\u00edm t\u011bchto \u0159\u00e1dk\u016f do na\u0161eho p\u0159\u00edkladu z\u00edsk\u00e1me spr\u00e1vn\u00e9 ukon\u010den\u00ed programu z hlediska spr\u00e1vy pam\u011bti.<\/p>\n
<\/p>\n
Jak vid\u00edme, spr\u00e1vn\u00e9 ukon\u010den\u00ed programu od n\u00e1s vy\u017eadovalo p\u0159idat p\u0159ibli\u017en\u011b stejn\u00fd po\u010det \u0159\u00e1dk\u016f k\u00f3du, jako na jeho za\u010d\u00e1tku, a pr\u016fm\u011brn\u011b na ka\u017ed\u00fd filtr p\u0159ipadly \u010dty\u0159i \u0159\u00e1dky k\u00f3du. To znamen\u00e1, \u017ee velikost k\u00f3du programu poroste \u00fam\u011brn\u011b po\u010dtu pou\u017eit\u00fdch filtr\u016f v projektu. Pokud mluv\u00edme o tis\u00edci filtrech ve sch\u00e9matu, p\u0159id\u00e1 se k va\u0161emu k\u00f3du \u010dty\u0159i tis\u00edce \u0159\u00e1dk\u016f rutinn\u00edch operac\u00ed pro jejich vytv\u00e1\u0159en\u00ed a ni\u010den\u00ed.<\/p>\n
<\/p>\n
Nyn\u00ed v\u00edte, jak spr\u00e1vn\u011b ukon\u010dit program vyu\u017e\u00edvaj\u00edc\u00ed mediastreamer. V n\u00e1sleduj\u00edc\u00edch p\u0159\u00edkladech budu pro zjednodu\u0161en\u00ed vynech\u00e1vat tento krok. Ale vy na to nezapomenete?<\/p>\n
<\/p>\n
V\u00fdvoj\u00e1\u0159i mediastreameru nep\u0159edpokl\u00e1dali softwarov\u00e9 n\u00e1stroje pro usnadn\u011bn\u00ed manipulac\u00ed s filtry p\u0159i sestavov\u00e1n\u00ed\/rozeb\u00edr\u00e1n\u00ed sch\u00e9mat. P\u0159esto existuje helper, kter\u00fd umo\u017e\u0148uje rychl\u00e9 zasunov\u00e1n\u00ed\/vytahov\u00e1n\u00ed filtru ze sch\u00e9matu.<\/p>\n
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K t\u00e9to ot\u00e1zce se vr\u00e1t\u00edme pozd\u011bji, kdy\u017e po\u010det filtr\u016f v na\u0161ich p\u0159\u00edkladech p\u0159es\u00e1hne n\u011bkolik des\u00edtek.<\/p>\n
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V n\u00e1sleduj\u00edc\u00ed \u010dl\u00e1nku<\/a><\/noindex> Sestav\u00edme sch\u00e9ma m\u011b\u0159i\u010de \u00farovn\u011b sign\u00e1lu a nau\u010d\u00edme se \u010d\u00edst v\u00fdsledky m\u011b\u0159en\u00ed z filtru. Zhodnot\u00edme p\u0159esnost m\u011b\u0159en\u00ed.<\/p>\n
Zdroj: habr.com<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"
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