{"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\/it\/blog\/administrirovanie\/izuchaem-voip-dvizhok-mediastreamer2-chast-2","title":{"rendered":"Esploriamo il motore VoIP Mediastreamer2. Parte 2","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Il materiale dell'articolo \u00e8 tratto dal mio canale Zen<\/a><\/noindex>.<\/p>\n

<\/p>\n

\"Esploriamo<\/p>\n

<\/p>\n

Creiamo un generatore di tonalit\u00e0<\/h2>\n

<\/p>\n

Nella precedente articolo<\/a><\/noindex> Abbiamo installato la libreria di streaming multimediale, gli strumenti di sviluppo e verificato il loro funzionamento, creando un'app di prova.<\/p>\n

<\/p>\n

Oggi creeremo un'applicazione in grado di generare un segnale tonale attraverso la scheda audio. Per risolvere questo compito, dobbiamo collegare i filtri secondo lo schema mostrato di seguito del generatore di suoni:<\/p>\n

<\/p>\n

\"Esploriamo<\/p>\n

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

Leggiamo lo schema da sinistra a destra, poich\u00e9 in questa direzione fluisce il flusso di dati. Le frecce lo suggeriscono. I rettangoli rappresentano i filtri, che elaborano i blocchi di dati e producono il risultato in uscita. All'interno del rettangolo \u00e8 indicato il suo ruolo e un po' pi\u00f9 in basso il tipo di filtro in lettere maiuscole. Le frecce che collegano i rettangoli rappresentano le code di dati, attraverso le quali i blocchi di dati vengono trasportati da un filtro all'altro. In generale, un filtro pu\u00f2 avere molti ingressi e uscite.<\/p>\n

<\/p>\n

Tutto inizia con la sorgente del clock, che stabilisce il ritmo con cui avviene il calcolo dei dati nei filtri. Seguendo il suo tempo, ogni filtro elabora tutti i blocchi di dati in ingresso. E produce i blocchi con il risultato in uscita \u2014 in coda. Prima viene eseguito il calcolo del filtro pi\u00f9 vicino alla sorgente del clock, poi i filtri collegati alle sue uscite (che possono essere molte) e cos\u00ec via. Dopo che l'ultimo filtro nella catena ha completato il calcolo, l'esecuzione si interrompe fino a quando non arriva un nuovo impulso. Gli impulsi, per impostazione predefinita, seguono con un intervallo di 10 millisecondi. <\/p>\n

<\/p>\n

Torniamo al nostro schema. I campioni vengono immessi da una sorgente di silenzio, un filtro che genera, a ogni campione, un blocco di dati contenente zeri in uscita. Se consideriamo questo blocco come un blocco di campionamenti sonori, in effetti non \u00e8 altro che silenzio. A prima vista sembra strano generare blocchi di dati silenziosi, perch\u00e9 non possono essere uditi, ma questi blocchi sono necessari per il funzionamento del generatore del segnale audio. Il generatore utilizza questi blocchi come un foglio di carta vuoto, scrivendo in essi i campionamenti sonori. In condizioni normali, il generatore \u00e8 spento e semplicemente inoltra i blocchi in ingresso all'uscita. In questo modo, i blocchi di silenzio passano inalterati attraverso tutto lo schema da sinistra a destra, finendo nella scheda audio. Quest'ultima preleva silenziosamente i blocchi dalla coda collegata al suo ingresso.<\/p>\n

<\/p>\n

Ma tutto cambia se al generatore viene dato il comando di riprodurre il suono; inizia a generare campionamenti sonori e li sostituisce all'interno dei blocchi in ingresso, esponendo i blocchi modificati all'uscita. La scheda audio inizia a riprodurre il suono. Di seguito \u00e8 riportato il programma che implementa lo schema di funzionamento descritto sopra:<\/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
Dopo l'inizializzazione dello stream media, vengono creati tre filtri: voidsource, dtmfgen, snd_card_write<\/em>. Viene creato un generatore di clock.<\/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
Il collegamento dei filtri avviene tramite la funzione <\/p>\n
<\/p>\n
ms_filter_link(src, src_out, dst, dst_in)<\/code><\/pre>\n
<\/p>\n
dove il primo argomento \u00e8 un puntatore al filtro sorgente, il secondo argomento \u00e8 il numero di uscita della sorgente (si noti che gli ingressi e le uscite sono numerati a partire da zero). Il terzo argomento \u00e8 un puntatore al filtro di destinazione, il quarto \u00e8 il numero dell'ingresso del destinatario.<\/p>\n
<\/p>\n
Tutti i filtri sono collegati e l'ultimo a connettersi \u00e8 la sorgente del clock (d'ora in poi lo chiameremo semplicemente ticker). Dopodich\u00e9, il nostro schema audio inizia a funzionare, ma dal lato del computer non si sente ancora nulla \u2014 il generatore audio \u00e8 spento e semplicemente trasmette i blocchi di dati d'ingresso silenziosi. Per avviare la generazione del segnale tonale, \u00e8 necessario eseguire il metodo del filtro del generatore.<\/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> richiamando il metodo MS_DTMF_GEN_PLAY, passando come argomento un puntatore al codice corrispondente al segnale da riprodurre.<\/p>\n
<\/p>\n
Rimane da compilare il programma:<\/p>\n
<\/p>\n
$ gcc mstest2.c -o mstest2 `pkg-config mediastreamer --libs --cflags`<\/code><\/pre>\n
<\/p>\n
E avviarlo:<\/p>\n
<\/p>\n
$ .\/mstest2<\/code><\/pre>\n
<\/p>\n
Dopo l'avvio del programma, sentirai nel computer un breve segnale audio composto da due toni.<\/p>\n
<\/p>\n
Abbiamo costruito e messo in funzione il nostro primo schema sonoro. Abbiamo visto come creare istanze di filtri, come collegarli e come chiamare i loro metodi. Dopo aver festeggiato il primo successo, dobbiamo comunque prestare attenzione al fatto che il nostro programma non libera la memoria allocata prima di terminare. Nella prossima articolo<\/a><\/noindex> impareremo a mettere in ordine.<\/p>\n
Fonte: 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\udd47Esploriamo il motore VoIP Mediastreamer2. Parte 2 | ProHoster","description":"Il materiale dell'articolo \u00e8 tratto dal mio canale Zen. Creiamo un generatore tonale. Nell'articolo precedente abbiamo completato l'installazione della libreria media streamer, degli strumenti di sviluppo e abbiamo verificato il loro funzionamento, assemblando un'app di prova. Oggi creeremo un'applicazione in grado di generare un segnale tonale sulla scheda audio. 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