{"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\/es\/blog\/administrirovanie\/izuchaem-voip-dvizhok-mediastreamer2-chast-3","title":{"rendered":"Estudiando el motor VoIP Mediastreamer2. Parte 3","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

El material del art\u00edculo fue tomado de mi canal de Zen<\/a><\/noindex>.<\/p>\n

<\/p>\n

\"Estudiando<\/p>\n

<\/p>\n

Mejorando el ejemplo del generador de tonos<\/h2>\n

<\/p>\n

En el anterior el art\u00edculo<\/a><\/noindex> Hemos escrito una aplicaci\u00f3n para el generador de tonos y con ella hemos extra\u00eddo sonido del altavoz de la computadora. Ahora nos enfocaremos en el hecho de que nuestro programa, al finalizar su ejecuci\u00f3n, no devuelve la memoria al mont\u00f3n. Es hora de aclarar este asunto.<\/p>\n

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

Despu\u00e9s de que el esquema ya no nos sea necesario, la liberaci\u00f3n de la memoria debe comenzar con la detenci\u00f3n del flujo de datos. Para esto, necesitamos desconectar la fuente de reloj del esquema, el ticker, utilizando la funci\u00f3n ms_ticker_detach()<\/em>. En nuestro caso, debemos desconectar el ticker de la entrada del filtro voidsource<\/em>:<\/p>\n

<\/p>\n

ms_ticker_detach(ticker, voidsource)<\/code><\/pre>\n
<\/p>\n
Por cierto, despu\u00e9s de detener el flujo de datos, podemos modificar su esquema y volver a ponerlo en funcionamiento, reconectando el ticker de nuevo.<\/p>\n
<\/p>\n
Ahora podemos eliminarlo utilizando la funci\u00f3n ms_ticker_destroy()<\/em>:<\/p>\n
<\/p>\n
ms_ticker_destroy(ticker)<\/code><\/pre>\n
<\/p>\n
El flujo de datos est\u00e1 detenido y podemos comenzar a desmantelar sus partes, desconectando los filtros. Para esto se utiliza la funci\u00f3n 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
La asignaci\u00f3n de argumentos es la misma que en la funci\u00f3n ms_filter_link()<\/em>.<\/p>\n
<\/p>\n
Eliminamos, ahora ya desconectados, los filtros usando 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
Al agregar estas l\u00edneas a nuestro ejemplo, obtendremos una finalizaci\u00f3n correcta del programa desde el punto de vista de la gesti\u00f3n de memoria.<\/p>\n
<\/p>\n
Como podemos ver, una finalizaci\u00f3n correcta del programa requiri\u00f3 que agreg\u00e1ramos aproximadamente la misma cantidad de l\u00edneas de c\u00f3digo que al inicio, y, en promedio, nos hizo usar cuatro l\u00edneas de c\u00f3digo por cada filtro. As\u00ed que, el tama\u00f1o del c\u00f3digo del programa crecer\u00e1 proporcionalmente al n\u00famero de filtros utilizados en el proyecto. Si hablamos de mil filtros en el esquema, su c\u00f3digo se ver\u00e1 incrementado con cuatro mil l\u00edneas de operaciones rutinarias para crear y destruir filtros.<\/p>\n
<\/p>\n
Ahora ya sabe c\u00f3mo cerrar correctamente un programa que utiliza un mediastreamer. En los siguientes ejemplos, por brevedad, voy a \"olvidar\" hacerlo. Pero t\u00fa, \u00bfno lo olvidar\u00e1s?<\/p>\n
<\/p>\n
Los desarrolladores del media streamer no previeron herramientas de software para facilitar la manipulaci\u00f3n de filtros al ensamblar\/desensamblar esquemas. Sin embargo, hay un helper que permite insertar\/quitar filtros de manera r\u00e1pida del esquema.<\/p>\n
<\/p>\n
Volveremos a abordar esta cuesti\u00f3n m\u00e1s tarde, cuando el n\u00famero de filtros en nuestros ejemplos supere la docena.<\/p>\n
<\/p>\n
En la siguiente el art\u00edculo<\/a><\/noindex> Reuniremos un esquema del medidor de nivel de se\u00f1al y aprenderemos a leer el resultado de la medici\u00f3n del filtro. Evaluaremos la precisi\u00f3n de la medici\u00f3n.<\/p>\n
Fuente: habr.com<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"
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