{"id":87067,"date":"2020-07-03T07:42:03","date_gmt":"2020-07-03T05:42:03","guid":{"rendered":"https:\/\/prohoster.info\/blog\/administrirovanie\/izuchaem-voip-dvizhok-mediastreamer2-chast-2"},"modified":"2020-07-03T07:42:03","modified_gmt":"2020-07-03T05:42:03","slug":"izuchaem-voip-dvizhok-mediastreamer2-chast-2","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/administrirovanie\/izuchaem-voip-dvizhok-mediastreamer2-chast-2","title":{"rendered":"Uurime VoIP-mootorit Mediastreamer2. Osa 2","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Artikli sisu on p\u00e4rit minu zen-kanalist<\/a><\/noindex>.<\/p>\n

<\/p>\n

\"Uurime<\/p>\n

<\/p>\n

Loome toonigeneraatori<\/h2>\n

<\/p>\n

Eelmises osas artiklis<\/a><\/noindex> teostasime mediastreameri teegi paigaldamise, arendust\u00f6\u00f6riistade installimise ja kontrollisime nende toimimist, koostades proovirakenduse.<\/p>\n

<\/p>\n

T\u00e4na loome rakenduse, mis suudab helikaardil genereerida toonisignaali. Selle \u00fclesande t\u00e4itmiseks peame \u00fchendama filtrid allolevas heligeneraatori skeemis:<\/p>\n

<\/p>\n

\"Uurime<\/p>\n

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

Lugedes skeemi vasakult paremale, liigub meie andmevoog just selles suunas. Nooled viitavad sellele. Joonisega t\u00e4histatud ristk\u00fclikud on filtrid, mis t\u00f6\u00f6tlevad andmeplokke ja esitavad tulemuse v\u00e4ljundis. Ristk\u00fcliku sees on m\u00e4rgitud selle roll ja veidi allpool suurt\u00e4htedega filtri t\u00fc\u00fcp. Nooled, mis \u00fchendavad ristk\u00fclikud, on andmej\u00e4rjekorrad, mille kaudu andmeplokid edastatakse filtrist filtri juurde. \u00dcldiselt v\u00f5ib filtril olla mitmeid sisendeid ja v\u00e4ljundeid.<\/p>\n

<\/p>\n

K\u00f5ik algab takti allikast, mis m\u00e4\u00e4rab r\u00fctmi, milles andmeid filtrites t\u00f6\u00f6deldakse. Selle takti j\u00e4rgi t\u00f6\u00f6tleb iga filter k\u00f5ik andmeplokid, mis on sellele sisendiks. Ja saadab tulemused v\u00e4lja - j\u00e4rjekorda. Esmalt teostab arvutuse filter, mis on takti allikaga k\u00f5ige l\u00e4hemal, seej\u00e4rel filtrid, mis on \u00fchendatud tema v\u00e4ljunditega (v\u00e4ljundeid v\u00f5ib olla palju) ja nii edasi. P\u00e4rast seda, kui viimane filter ahelas l\u00f5petab arvutamise, peatutakse, kuni saabub uus takt. Takti, vaikimisi, j\u00e4rgivad 10 millisekundi intervalliga. <\/p>\n

<\/p>\n

Naas tagasi meie skeemile. Takti tuleb vaikuse allikasse, see on filter, mis iga takti jooksul genereerib oma v\u00e4ljundis nullide ploki. Kui vaadata seda plokki kui helim\u00f5\u00f5tmiste plokki, siis ei ole see midagi muud kui vaikus. Esialgu v\u00f5ib tunduda kummaline genereerida andmeplokke vaikuse jaoks \u2014 sest seda ei saa kuulda, aga need plokid on vajalikud heligeneraatori t\u00f6\u00f6ks. Generaator kasutab neid plokke nagu puhast paberilehte, kirjutades sinna helim\u00f5\u00f5tmised. Oma tavap\u00e4rases olekus on generaator v\u00e4lja l\u00fclitatud ja laseb lihtsalt sisende plokid v\u00e4ljundisse l\u00e4bi. Nii l\u00e4bivad vaikuse plokid muutumatult kogu skeemi vasakult paremale, sattudes helikaardile, mis vaikselt v\u00f5tab plokid oma sisendisse j\u00e4rjekorrast.<\/p>\n

<\/p>\n

Kuid k\u00f5ik muutub, kui generaatorile antakse k\u00e4sk helim\u00e4ngimiseks, ta hakkab genereerima helim\u00f5\u00f5tmisi ja asendab nendega sisendplokkide m\u00f5\u00f5tmed ning paneb muudetud plokid v\u00e4ljundisse. Helkaart hakkab heli taasesitama. Allpool on toodud programm, mis rakendab eespool kirjeldatud t\u00f6\u00f6skeemi:<\/p>\n

<\/p>\n

\/* \u0424\u0430\u0439\u043b mstest2.c *\/\n#include <mediastreamer2\/msfilter.h>\n#include <mediastreamer2\/msticker.h>\n#include <mediastreamer2\/dtmfgen.h>\n#include <mediastreamer2\/mssndcard.h>\nint main()\n{\n    ms_init();\n\n    \/* \u0421\u043e\u0437\u0434\u0430\u0435\u043c \u044d\u043a\u0437\u0435\u043c\u043f\u043b\u044f\u0440\u044b \u0444\u0438\u043b\u044c\u0442\u0440\u043e\u0432. *\/\n    MSFilter  *voidsource = ms_filter_new(MS_VOID_SOURCE_ID);\n    MSFilter  *dtmfgen = ms_filter_new(MS_DTMF_GEN_ID);\n    MSSndCard *card_playback = ms_snd_card_manager_get_default_card(ms_snd_card_manager_get());\n    MSFilter  *snd_card_write = ms_snd_card_create_writer(card_playback);\n\n    \/* \u0421\u043e\u0437\u0434\u0430\u0435\u043c \u0442\u0438\u043a\u0435\u0440. *\/\n    MSTicker *ticker = ms_ticker_new();\n\n    \/* \u0421\u043e\u0435\u0434\u0438\u043d\u044f\u0435\u043c \u0444\u0438\u043b\u044c\u0442\u0440\u044b \u0432 \u0446\u0435\u043f\u043e\u0447\u043a\u0443. *\/\n    ms_filter_link(voidsource, 0, dtmfgen, 0);\n    ms_filter_link(dtmfgen, 0, snd_card_write, 0);\n\n   \/* \u041f\u043e\u0434\u043a\u043b\u044e\u0447\u0430\u0435\u043c \u0438\u0441\u0442\u043e\u0447\u043d\u0438\u043a \u0442\u0430\u043a\u0442\u043e\u0432. *\/\n   ms_ticker_attach(ticker, voidsource);\n\n   \/* \u0412\u043a\u043b\u044e\u0447\u0430\u0435\u043c \u0437\u0432\u0443\u043a\u043e\u0432\u043e\u0439 \u0433\u0435\u043d\u0435\u0440\u0430\u0442\u043e\u0440. *\/\n   char key='1';\n   ms_filter_call_method(dtmfgen, MS_DTMF_GEN_PLAY, (void*)&key);\n\n   \/* \u0414\u0430\u0435\u043c, \u0432\u0440\u0435\u043c\u044f, \u0447\u0442\u043e\u0431\u044b \u0432\u0441\u0435 \u0431\u043b\u043e\u043a\u0438 \u0434\u0430\u043d\u043d\u044b\u0445 \u0431\u044b\u043b\u0438 \u043f\u043e\u043b\u0443\u0447\u0435\u043d\u044b \u0437\u0432\u0443\u043a\u043e\u0432\u043e\u0439 \u043a\u0430\u0440\u0442\u043e\u0439.*\/\n   ms_sleep(2);   \n}<\/code><\/pre>\n
<\/p>\n
P\u00e4rast meediastreameri initsialiseerimist luuakse kolm filtrit: voidsource, dtmfgen, snd_card_write<\/em>. Luuakse taktsignaali allikas.<\/p>\n
<\/p>\n
\u0417\u0430\u0442\u0435\u043c \u043d\u0443\u0436\u043d\u043e \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0442\u044c \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 \u0444\u0438\u043b\u044c\u0442\u0440\u043e\u0432 \u0432 \u0441\u043e\u043e\u0442\u0432\u0435\u0442\u0441\u0442\u0432\u0438\u0438 \u0441 \u043d\u0430\u0448\u0435\u0439 \u0441\u0445\u0435\u043c\u043e\u0439, \u043f\u0440\u0438\u0447\u0435\u043c \u0438\u0441\u0442\u043e\u0447\u043d\u0438\u043a \u0442\u0430\u043a\u0442\u043e\u0432 \u043d\u0443\u0436\u043d\u043e \u043f\u043e\u0434\u043a\u043b\u044e\u0447\u0430\u0442\u044c \u043f\u043e\u0441\u043b\u0435\u0434\u043d\u0438\u043c, \u0442\u0430\u043a \u043a\u0430\u043a \u043f\u043e\u0441\u043b\u0435 \u044d\u0442\u043e\u0433\u043e \u0441\u0440\u0430\u0437\u0443 \u043d\u0430\u0447\u043d\u0435\u0442\u0441\u044f \u0440\u0430\u0431\u043e\u0442\u0430 \u0441\u0445\u0435\u043c\u044b. \u0415\u0441\u043b\u0438 \u043f\u043e\u0434\u043a\u043b\u044e\u0447\u0438\u0442\u044c \u0438\u0441\u0442\u043e\u0447\u043d\u0438\u043a \u0442\u0430\u043a\u0442\u043e\u0432 \u043a \u043d\u0435\u0437\u0430\u043a\u043e\u043d\u0447\u0435\u043d\u043d\u043e\u0439 \u0441\u0445\u0435\u043c\u0435, \u0442\u043e \u043c\u043e\u0436\u0435\u0442 \u0441\u043b\u0443\u0447\u0438\u0442\u0441\u044f \u0442\u0430\u043a, \u0447\u0442\u043e \u043c\u0435\u0434\u0438\u0430\u0441\u0442\u0440\u0438\u043c\u0435\u0440 \u0430\u0432\u0430\u0440\u0438\u0439\u043d\u043e \u0437\u0430\u0432\u0435\u0440\u0448\u0438\u0442\u0441\u044f, \u0435\u0441\u043b\u0438 \u043e\u0431\u043d\u0430\u0440\u0443\u0436\u0438\u0442 \u0432 \u0446\u0435\u043f\u043e\u0447\u043a\u0435 \u0445\u043e\u0442\u044f \u0431\u044b \u043e\u0434\u0438\u043d \u0444\u0438\u043b\u044c\u0442\u0440 \u0443 \u043a\u043e\u0442\u043e\u0440\u043e\u0433\u043e \u0432\u0441\u0435 \u0432\u0445\u043e\u0434\u044b \u0438\u043b\u0438 \u0432\u0441\u0435 \u0432\u044b\u0445\u043e\u0434\u044b "\u0432\u0438\u0441\u044f\u0442 \u0432 \u0432\u043e\u0437\u0434\u0443\u0445\u0435" (\u043d\u0435 \u043f\u043e\u0434\u043a\u043b\u044e\u0447\u0435\u043d\u044b). <\/p>\n
<\/p>\n
Filtrite \u00fchendamine toimub funktsiooni abil <\/p>\n
<\/p>\n
ms_filter_link(src, src_out, dst, dst_in)<\/code><\/pre>\n
<\/p>\n
, kus esimene argument on viide allika filtrile, teine argument \u2014 allika v\u00e4ljundi number (pange t\u00e4hele, et sisse- ja v\u00e4ljundid on nummerdatud alates nullist). Kolmas argument on viide sihtfiltri jaoks, neljas \u2014 vastuv\u00f5tja sisendi number.<\/p>\n
<\/p>\n
K\u00f5ik filtrid on \u00fchendatud ja viimaseks \u00fchendatakse takti allikas (edaspidi nimetame seda lihtsalt tikkeriks). P\u00e4rast seda k\u00e4ivitub meie heliskeem, kuid arvuti k\u00f5laritest ei ole hetkel midagi kuulda - heligeneraator on v\u00e4lja l\u00fclitatud ja lihtsalt edastab andmeblokke vaikuses. Helisignaali genereerimiseks peab olema aktiveeritud generaatori filtri meetod.<\/p>\n
<\/p>\n
\u041c\u044b \u0431\u0443\u0434\u0435\u043c \u0433\u0435\u043d\u0435\u0440\u0438\u0440\u043e\u0432\u0430\u0442\u044c \u0434\u0432\u0443\u0442\u043e\u043d\u0430\u043b\u044c\u043d\u044b\u0439 (DTMF) \u0441\u0438\u0433\u043d\u0430\u043b \u0441\u043e\u043e\u0442\u0432\u0435\u0442\u0441\u0442\u0432\u0443\u044e\u0449\u0438\u0439 \u043d\u0430\u0436\u0430\u0442\u0438\u044e \u043d\u0430 \u0442\u0435\u043b\u0435\u0444\u043e\u043d\u0435 \u043a\u043d\u043e\u043f\u043a\u0438 "1". \u0414\u043b\u044f \u044d\u0442\u043e\u0433\u043e \u043c\u044b \u0441 \u043f\u043e\u043c\u043e\u0449\u044c\u044e \u0444\u0443\u043d\u043a\u0446\u0438\u0438 ms_filter_call_method()<\/em> kutsume v\u00e4lja meetodi MS_DTMF_GEN_PLAY, edastades sellele argumentidena viite koodile, millele vastab m\u00e4ngitav signaal.<\/p>\n
<\/p>\n
Seej\u00e4rel tuleb programm kompileerida:<\/p>\n
<\/p>\n
$ gcc mstest2.c -o mstest2 `pkg-config mediastreamer --libs --cflags`<\/code><\/pre>\n
<\/p>\n
Ja k\u00e4ivitada:<\/p>\n
<\/p>\n
$ .\/mstest2<\/code><\/pre>\n
<\/p>\n
Programmi k\u00e4ivitamisel kuulete arvuti k\u00f5larites l\u00fchikest helisignaali, mis koosneb kahest toonist.<\/p>\n
<\/p>\n
Meie esimese heliskeemi loomisest ja t\u00f6\u00f6lepanemisest. N\u00e4gime, kuidas filtreid luua, \u00fchendada ja kuidas nende meetodeid kutsuda. Kuigi esimesest edust r\u00f5\u00f5mustasime, peame siiski t\u00e4helepanu p\u00f6\u00f6rama sellele, et meie programm ei vabasta enne l\u00f5petamist eraldatud m\u00e4lu. J\u00e4rgmises artiklis<\/a><\/noindex> \u00f5pime enda j\u00e4rel koristama.<\/p>\n
Allikas: habr.com<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"
\u041c\u0430\u0442\u0435\u0440\u0438\u0430\u043b \u0441\u0442\u0430\u0442\u044c\u0438 \u0432\u0437\u044f\u0442 \u0441 \u043c\u043e\u0435\u0433\u043e \u0434\u0437\u0435\u043d-\u043a\u0430\u043d\u0430\u043b\u0430. \u0421\u043e\u0437\u0434\u0430\u0435\u043c \u0442\u043e\u043d\u0430\u043b\u044c\u043d\u044b\u0439 \u0433\u0435\u043d\u0435\u0440\u0430\u0442\u043e\u0440 \u0412 \u043f\u0440\u0435\u0434\u044b\u0434\u0443\u0449\u0435\u0439 \u0441\u0442\u0430\u0442\u044c\u0435 \u043c\u044b \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u043b\u0438 \u0443\u0441\u0442\u0430\u043d\u043e\u0432\u043a\u0443 \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0438 \u043c\u0435\u0434\u0438\u0430\u0441\u0442\u0440\u0438\u043c\u0435\u0440\u0430, \u0438\u043d\u0441\u0442\u0440\u0443\u043c\u0435\u043d\u0442\u043e\u0432 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0438 \u0438 \u043f\u0440\u043e\u0432\u0435\u0440\u0438\u043b\u0438 \u0438\u0445 \u0444\u0443\u043d\u043a\u0446\u0438\u043e\u043d\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u0435, \u0441\u043e\u0431\u0440\u0430\u0432 \u043f\u0440\u043e\u0431\u043d\u043e\u0435 \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u0435. \u0421\u0435\u0433\u043e\u0434\u043d\u044f \u043c\u044b \u0441\u043e\u0437\u0434\u0430\u0434\u0438\u043c \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u0435, \u043a\u043e\u0442\u043e\u0440\u043e\u0435 \u0441\u043c\u043e\u0436\u0435\u0442 \u043f\u0440\u043e\u043f\u0438\u043b\u0438\u043a\u0430\u0442\u044c \u043d\u0430 \u0437\u0432\u0443\u043a\u043e\u0432\u043e\u0439 \u043a\u0430\u0440\u0442\u0435 \u0442\u043e\u043d\u0430\u043b\u044c\u043d\u044b\u0439 \u0441\u0438\u0433\u043d\u0430\u043b. \u0427\u0442\u043e\u0431\u044b \u0440\u0435\u0448\u0438\u0442\u044c \u044d\u0442\u0443 \u0437\u0430\u0434\u0430\u0447\u0443 \u043d\u0430\u043c \u043d\u0443\u0436\u043d\u043e \u0441\u043e\u0435\u0434\u0438\u043d\u0438\u0442\u044c \u0444\u0438\u043b\u044c\u0442\u0440\u044b \u0432 \u043f\u043e\u043a\u0430\u0437\u0430\u043d\u043d\u0443\u044e \u043d\u0438\u0436\u0435 \u0441\u0445\u0435\u043c\u0443 \u0437\u0432\u0443\u043a\u043e\u0432\u043e\u0433\u043e \u0433\u0435\u043d\u0435\u0440\u0430\u0442\u043e\u0440\u0430: \u0427\u0438\u0442\u0430\u0435\u043c \u0441\u0445\u0435\u043c\u0443 \u0441\u043b\u0435\u0432\u0430 […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":87068,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-87067","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47 Uurime VoIP-mootorit Mediastreamer2. 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