June 2013
Intermediate to advanced
360 pages
6h 50m
Chinese
Content preview from COCOA學習手冊--使用OBJECTIVE-C第三版
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第八章
音頻與視頻
如前所見，Cocoa 和 Cocoa Touch 大力支援靜態圖像與文字的展示，同樣地，其 API 對
於音頻（audio）與視頻（video）的播放也具有很棒的支援—分開處理或同時處理都可
以。
OS X 與 iOS 從很久以前就具有播放視頻（AV ，audiovisual）內容的 API，但直到
最 近，Apple 才引進可用來載入、播放、及處理 AV 內容的全方位 API，稱作
AV
Foundation
，在 OS X 與 iOS 上都相同，而且 AV 播放與編輯皆可處理。
在這一章裡，你將學習如何使用 AV Foundation 展示音頻與視頻，我們將示範如何在 OS
X 裡使用框架，但相同的 API 也適用於 iOS。
你也會學到如何在 iOS 上存取使用者的照片庫（photo library），以及如何在 iOS 和 OS
X 上使用內建照相機捕捉照片與視頻。
AV Foundation 是一個龐大且深具威力的框架，能夠對音頻與視頻執行非
常複雜的操作。Final Cut Pro（Apple 的專業視頻編輯工具）利用 AV
Foundation 處理編輯視頻所涉及的一切實際工作。說明這個框架的所有
功能顯然超出本書的討論範疇，因此本章僅處理音頻與視頻的播放，如果
你想學習 AV Foundation 裡頭更進階的功能，請參考 Xcode 文件說明裡
的〈
AV Foundation Programming Guide
〉（
http://bit.ly/TQDmVg
）。
129
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.