blocks|key|2470361|text|不幸的是，在iPhone上播放音频流并不简单。这是让我开始的文章：Streaming+and+playing+an+MP3+stream|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2470362|这是一个OSX项目，但它的大部分也可以与iPhone一起工作。至于获得它的完整播放时间，如果它是一个CBR文件，你可能必须根据http头文件的content-length属性来确定。否则，我想您必须先下载整个文件，然后才能确定。|2470363|entityMap|0|LINK|mutability|MUTABLE|url|http://cocoawithlove.com/2009/06/revisiting-old-post-streaming-and.html^0|X|Z|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]]|C|$]]|$1|D|3|E|5|6|7|R|8|@]|9|@]|C|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]]]

There's unfortunately nothing simple about playing audio streams on the iPhone. Here's the article that got me started:
<a href="http://cocoawithlove.com/2009/06/revisiting-old-post-streaming-and.html" rel="nofollow noreferrer">Streaming and playing an MP3 stream</a>

It's an OSX project, but most of it will work with the iPhone too. As for getting the full play time of it, you'd probably have to figure that out based on the content-length property of http header, provided it's a CBR file. Otherwise, I imagine you'd have to download the entire file before determining that.

blocks|key|3697539|text|在iPhone+Cool+Projects中有一个关于音频流的很好的章节。http://apress.com/book/view/9781430223573它展示了一种比AudioStreamer更简单的方法(使用NSURLConnection而不是CFNetwork)，更适合渐进式下载，并且没有多线程代码。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3697540|为了找出音频文件的大小，您可以在|3697541|-+(void)connection:(NSURLConnection+*)connection+didReceiveResponse:(NSURLResponse+*)response+|code-block|syntax|javascript|3697542|entityMap|0|LINK|mutability|MUTABLE|url|http://apress.com/book/view/9781430223573^0|11|15|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@$A|T|B|U|1|V]]|C|$]]|$1|D|3|E|5|6|7|W|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|X|8|@]|9|@]|C|$I|J]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]]]

There's a really good chapter about streaming audio in iPhone Cool Projects.
<a href="http://apress.com/book/view/9781430223573" rel="nofollow">http://apress.com/book/view/9781430223573</a>
It shows a simpler approach then AudioStreamer (Using NSURLConnection instead of CFNetwork), better suited for progressive downloading, and no multi threading code.

And for finding out the size of the audio file you can use <code>[response expectedContentLength]</code> in

<pre><code>- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response 
</code></pre>

blocks|key|559529|text|如果您只需要播放MP3文件，为什么还要编写自己的下载程序/播放器？iOS内置了几个选项，每个选项都支持渐进式下载和MP3播放：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|559530|559531|MPMoviePlayerController+|unordered-list-item|offset|length|style|CODE|559532|AVPlayer|559533|Safari+<audio>+player|559534|559535|我个人对MPMoviePlayerController和AVPlayer的渐进式下载功能有问题，所以也许这也是你的问题。我发现这些玩家试图聪明地多次请求mp3，检查服务器是否支持通过http范围偏移的渐进式下载。但是当服务器不支持范围偏移量时，文件会被多次下载，占用带宽(!)。|559536|在我的最新项目中，我嵌入了一个嵌入了html+<audio>标签的UIWebView。Safari播放器似乎比AVPlayer和MPMoviePlayerController表现得更好，但它也有自己的警告。首先，让autoplay正常工作是一件很困难的事情。|559537|entityMap^0|0|0|0|N|0|0|8|0|7|7|0|0|4|N|S|8|0|N|7|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|V|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|W|8|@$F|X|G|Y|H|I]]|9|@]|A|$]]|$1|J|3|K|5|E|7|Z|8|@$F|10|G|11|H|I]]|9|@]|A|$]]|$1|L|3|M|5|E|7|12|8|@$F|13|G|14|H|I]]|9|@]|A|$]]|$1|N|3|-4|5|6|7|15|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|16|8|@$F|17|G|18|H|I]|$F|19|G|1A|H|I]]|9|@]|A|$]]|$1|Q|3|R|5|6|7|1B|8|@$F|1C|G|1D|H|I]]|9|@]|A|$]]|$1|S|3|-4|5|6|7|1E|8|@]|9|@]|A|$]]]|T|$]]

If you only need to play MP3 files, why are you writing your own downloader/player? You have a few options built into iOS, each of which support progressive download and MP3 playback:

<ul>
<li><code>MPMoviePlayerController</code> </li>
<li><code>AVPlayer</code></li>
<li>Safari <code>&lt;audio&gt;</code> player</li>
</ul>

I've personally had issues with the progressive download capabilities of <code>MPMoviePlayerController</code> and <code>AVPlayer</code>, so perhaps this is your issue also. I've found that these players try to be smart by requesting the mp3 multiple times, checking to see if the server supports progressive download via http range offsets. But when the server doesn't support range offsets the file is downloaded multiple times, eating bandwidth (!).

In my latest project I embedded a UIWebView having a html <code>&lt;audio&gt;</code> tag embedded. The Safari player seems to behave better than AVPlayer and MPMoviePlayerController, but it had its own caveats as well. For one, getting autoplay to work was a PITA.

blocks|key|3697571|text|我知道这是一个相当古老的帖子，但我想推荐一个可靠的开源类库。它基于@pzearfoss上面推荐的Matt+Gallagher的原始帖子。当前版本现在使用的是AudioUnits，而不是AudioQueue类，因此它允许您访问原始的PCM样本，以便进行任何操作(过滤等)。在播放之前。它还为您提供了免费的渐进式下载功能，只需很少的工作。该库似乎正在积极更新，这是一个巨大的优势！|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3697572|StreamingKit+by+@tumtumtum|offset|length|3697573|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/tumtumtum/StreamingKit^0|0|0|Q|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@$D|P|E|Q|1|R]]|A|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|M]]]]

I know this is a rather old post, but wanted to suggest a solid library that is open source. It is based on Matt Gallagher's original post recommended by @pzearfoss above. The current version uses AudioUnits now, rather than the AudioQueue classes, so it gives you access to the raw PCM samples for any manipulation you want to make (filtering, etc.) before playback. It also gives you progressive download capabilities for free, with rather minimal effort. The library seems to be actively updated which is a huge plus!

<a href="https://github.com/tumtumtum/StreamingKit" rel="nofollow">StreamingKit by @tumtumtum</a>

I'm trying to implement a progressive download audio player for the iPhone, using http and fixed size mp3-files.

I found the AudioStreamer project but it seems very complicated and works best with endless streams.

I need to be able to find out the total length of audio files and I also need to be able to seek in the files. I found a hacked deviation from AudioStreamer but it doesn't seem to work very well for me. <a href="http://www.saygoodnight.com/?p=14" rel="nofollow noreferrer">http://www.saygoodnight.com/?p=14</a>

I'm wondering if there is a simpler way to achieve my goals or if there are some better working samples out there? I found the bass library but not much documentation about it.

/Br Johannes

iPhone progressive download audio player

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我正在尝试为iPhone实现一个渐进式下载音频播放器，使用http和固定大小的MP3文件。我找到了AudioStreamer项目，但它看起来非常复杂，并且最适合于无休止的流。我需要能够找出音频文件的总长度，我也需要能够在文件中寻找。我发现了一个与AudioStreamer的偏差，但它似乎不是很好地为我工作。我想知道是否...

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