{"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\/it\/blog\/administrirovanie\/izuchaem-voip-dvizhok-mediastreamer2-chast-3","title":{"rendered":"Esploriamo il motore VoIP Mediastreamer2. Parte 3","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

Miglioriamo l'esempio del generatore di toni<\/h2>\n

<\/p>\n

Nella precedente articolo<\/a><\/noindex> Abbiamo scritto un'applicazione generatore di toni e con essa abbiamo estratto il suono dagli altoparlanti del computer. Ora ci concentreremo sul fatto che il nostro programma, alla fine dell'esecuzione, non restituisce la memoria al heap. \u00c8 giunto il momento di chiarire questa questione.<\/p>\n

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

Dopo che lo schema non ci serve pi\u00f9, il rilascio della memoria deve iniziare con l'arresto della pipeline dei dati. Per fare ci\u00f2, dobbiamo disconnettere la sorgente del clock dallo schema utilizzando la funzione ms_ticker_detach()<\/em>. Nel nostro caso dobbiamo disconnettere il ticker dall'ingresso del filtro voidsource<\/em>:<\/p>\n

<\/p>\n

ms_ticker_detach(ticker, voidsource)<\/code><\/pre>\n
<\/p>\n
A proposito, dopo aver fermato la pipeline possiamo modificare il suo schema e riavviarla collegando nuovamente il ticker.<\/p>\n
<\/p>\n
Ora possiamo eliminarlo utilizzando la funzione ms_ticker_destroy()<\/em>:<\/p>\n
<\/p>\n
ms_ticker_destroy(ticker)<\/code><\/pre>\n
<\/p>\n
La pipeline \u00e8 bloccata e possiamo procedere allo smontaggio delle sue parti, scollegando i filtri. Per questo si utilizza la funzione 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
l'assegnazione degli argomenti \u00e8 la stessa della funzione ms_filter_link()<\/em>.<\/p>\n
<\/p>\n
Rimuoviamo ora i filtri gi\u00e0 disconnessi utilizzando 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
Aggiungendo queste righe al nostro esempio, otterremo una chiusura corretta del programma in termini di gestione della memoria.<\/p>\n
<\/p>\n
Come possiamo vedere, una chiusura corretta del programma ha richiesto di aggiungere circa lo stesso numero di righe di codice all'inizio; in media, per ogni filtro sono state necessarie quattro righe di codice. Questo significa che la dimensione del codice del programma aumenter\u00e0 proporzionalmente al numero di filtri utilizzati nel progetto. Parlando di mille filtri nello schema, aggiungeremo quattromila righe di operazioni di routine per la creazione e la distruzione di essi.<\/p>\n
<\/p>\n
\u0422\u0435\u043f\u0435\u0440\u044c \u0432\u044b \u0437\u043d\u0430\u0435\u0442\u0435 \u043a\u0430\u043a \u043a\u043e\u0440\u0440\u0435\u043a\u0442\u043d\u043e \u0437\u0430\u0432\u0435\u0440\u0448\u0430\u0442\u044c \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u0443 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u044e\u0449\u0443\u044e \u043c\u0435\u0434\u0438\u0430\u0441\u0442\u0440\u0438\u043c\u0435\u0440. \u0412 \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0438\u0445 \u043f\u0440\u0438\u043c\u0435\u0440\u0430\u0445, \u0434\u043b\u044f \u043a\u043e\u043c\u043f\u0430\u043a\u0442\u043d\u043e\u0441\u0442\u0438 \u0438\u0437\u043b\u043e\u0436\u0435\u043d\u0438\u044f, \u044f \u0431\u0443\u0434\u0443 "\u0437\u0430\u0431\u044b\u0432\u0430\u0442\u044c" \u044d\u0442\u043e \u0434\u0435\u043b\u0430\u0442\u044c. \u041d\u043e \u0432\u044b-\u0442\u043e \u043d\u0435 \u0437\u0430\u0431\u0443\u0434\u0435\u0442\u0435?<\/p>\n
<\/p>\n
Gli sviluppatori del media streamer non hanno previsto strumenti software per semplificare le manipolazioni con i filtri durante l'assemblaggio\/scomposizione degli schemi. Tuttavia, c'\u00e8 un helper che consente di inserire\/rimuovere rapidamente un filtro dallo schema.<\/p>\n
<\/p>\n
Torneremo a risolvere questa questione pi\u00f9 tardi, quando il numero di filtri nei nostri esempi superer\u00e0 alcune decine.<\/p>\n
<\/p>\n
Nella prossima articolo<\/a><\/noindex> Raccoglieremo lo schema del misuratore di livello del segnale e impareremo a leggere il risultato della misurazione dal filtro. Valuteremo l'accuratezza della misurazione.<\/p>\n
Fonte: habr.com<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"
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Parte 3 | ProHoster","description":"Il materiale dell'articolo \u00e8 tratto dal mio canale Zen. Miglioriamo l'esempio del generatore di toni. Nell'articolo precedente abbiamo scritto un'applicazione per il generatore di toni e con essa abbiamo estratto il suono dallo speaker del computer. Ora ci concentreremo sul fatto che il nostro programma, terminando l'esecuzione, non restituisce la memoria al heap. \u00c8 tempo di fare chiarezza su questo punto. 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