音頻（2）：About Audio and Video

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About Audio and Video

關于音頻和視頻

Whether multimedia features are central or incidental to your application, iPhone, iPod touch, and iPad users expect high quality. When presenting video content, take advantage of the device’s high-resolution screen and high frame rates. When designing the audio portion of your application, keep in mind that compelling sound adds immeasurably to a user’s overall experience.

無論多媒體功能對你的應用程序來說是處于核心位置還是附帶的內容，iPhone、iPod touch以及iPad用戶都希望它是高質量的。當提供視頻內容的時候，利用設備的高分辨率的屏幕和高幀速率。當設計你的應用程序的音頻部分的時候，記住無限的增加聲音的吸引力來提高用戶的整體體驗。

You can take advantage of the iOS multimedia frameworks for adding features like:

你可以利用iOS多媒體框架來添加如下功能：

• 高質量的音頻錄制、回放以及流。

• 身臨其境的游戲聲音。

• 生動的語音聊天。

• 播放用戶iPod庫中的內容。

• 在支持的設備上播放和錄制視頻。

High-quality audio recording, playback, and streaming

Immersive game sounds

Live voice chat

Playback of content from a user’s iPod library

Video playback and recording on supported devices

In iOS 4.0 and later, the AV Foundation framework gives you fine-grained control over inspecting, editing, and presenting audio-visual assets.

在iOS 4.0 及以后版本，AV Foundation 框架讓你可以精細的控制檢查、編輯以及呈現視聽資料。

Organization of This Document

本文檔的組織

This document contains the following chapters:

本文檔包含以下章節：

* “Using Audio”顯示如何使用系統的音頻技術來播放和錄制音頻。

* “Using Video” 顯示如何使用系統的視頻技術來播放和獲取視頻。

“Using Audio” shows how to use the system’s audio technologies to play and record audio.

“Using Video” shows how to use the system’s video technologies to play and capture video.

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