在 iOS 上提高 mp3 音量
我正在寻找有关 http://developer.apple.com/library/ios 的信息以及https://stackoverflow.com/，但找不到简单而优雅的解决方案。
我将描述关键问题：从 iPod 媒体库获取 MP3 文件并增加其音量。收到文件并播放密钥后出现问题。
但问题 - 尚未解决：
如何更改音量并重新编码 MP3 文件 - 这样音量就永远改变了？中给出的解决方案 iOS：在设备上创建 MP3 Xcode、构建和 dylibs id3 图像编辑后播放 mp3 时遇到问题 并不让我觉得简单又好.
如何将 iTunes 资料库中的文件替换为制作我的程序的文件？需要强制用户同步此设备，并手动将文件拖放到库中，我 razocharovyaet。
有什么意见或建议吗？我将不胜感激。
I was looking for information on http://developer.apple.com/library/ios as well as on https://stackoverflow.com/, but could not find a simple and elegant solution.
I will describe the key problems: it takes to get MP3 file from your media library iPod and increase its volume. On receipt of the file and playing key problems arise.
But the questions - which are not resolved:
How do I change the volume and re-encode MP3 file - so the volume was changed forever? The solution given in
iOS: Create an MP3 on device
Xcode, building and dylibs
Trouble playing mp3s after id3 image edit not strike me as simple and good.How do I replace the files from your iTunes library to the ones that made my program? The need to force the user to synchronize this device, and manually drag and drop files to the library I razocharovyaet.
Are there any - any comments or suggestions. I would appreciate it.
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重新编码会导致音频质量下降。好消息是您不需要这样做：iTunes 中内置了一项名为“声音检查”的功能，可以确保您的所有歌曲都以相同的音量播放。 iTunes 扫描歌曲并将音量信息存储在 ID3 标签内。有关详细信息，请阅读此处：http://en.wikipedia.org/wiki/ReplayGain
如果您仍然想这样做，这还告诉您如何在 iOS 上实现它。
但是，无法将更改同步回 iTunes 资料库。
Re-encoding would cause a decrease of the audio quality. The good news is that you don't need to do this: There is a feature called "Sound Check" built into iTunes that ensures that all your songs are played with the same volume. iTunes scans the songs and stores the volume information inside the ID3 tags. For more information on this, read here: http://en.wikipedia.org/wiki/ReplayGain
This also tells you how to implement it on iOS if you still want to do it.
However, there is no way to sync your changes back to your iTunes library.
我在 iTunes Music Library.xml 中找到密钥
I can boost volume on iTunes via this =). This match more better for me, except encode and realization meshanisms of lame/ffmpeg etc.
2009 Track ID2009 NameStanding On The Shore ArtistEmpire Of The Sun Album ArtistEmpire Of The Sun AlbumWalking On A Dream Genre KindАудиофайл MPEG Size10564118 Total Time263836 Track Number1 Date Modified2011-11-26T19:52:01Z Date Added2011-09-23T20:59:24Z Bit Rate320 Sample Rate44100 Volume Adjustment192 Play Count12 Play Date3402675506 Play Date UTC2011-10-28T17:38:26Z Skip Count2 Skip Date2011-11-06T10:15:51Z Rating100 Album Rating60 Album Rating Computed Persistent ID2CF1305AEEF0FCDB Track TypeFile Locationfile://localhost/Users/wins/Music/iTunes/iTunes%20Media/Music/Empire%20Of%20The%20Sun/Walking%20On%20A%20Dream/01%20Standing%20On%20The%20Shore.mp3 File Folder Count5 Library Folder Count1I'm find in iTunes Music Library.xml key
I can boost volume on iTunes via this =). This match more better for me, except encode and realization meshanisms of lame/ffmpeg etc.
2009 Track ID2009 NameStanding On The Shore ArtistEmpire Of The Sun Album ArtistEmpire Of The Sun AlbumWalking On A Dream Genre KindАудиофайл MPEG Size10564118 Total Time263836 Track Number1 Date Modified2011-11-26T19:52:01Z Date Added2011-09-23T20:59:24Z Bit Rate320 Sample Rate44100 Volume Adjustment192 Play Count12 Play Date3402675506 Play Date UTC2011-10-28T17:38:26Z Skip Count2 Skip Date2011-11-06T10:15:51Z Rating100 Album Rating60 Album Rating Computed Persistent ID2CF1305AEEF0FCDB Track TypeFile Locationfile://localhost/Users/wins/Music/iTunes/iTunes%20Media/Music/Empire%20Of%20The%20Sun/Walking%20On%20A%20Dream/01%20Standing%20On%20The%20Shore.mp3 File Folder Count5 Library Folder Count1