请问，怎么从一个mp3文件中剪切一段并保存为文件？ 怎么判断mp3文件可以播放多久？谢谢！

[wenminghu]

哪里有例子可以参考啊？或者什么库有这个功能？谢谢！

[gjd111686]

Windows Media SDK的帮助文档

[Oversense]

mp3文件是分段的，也就是说任意取出其中的一段，都可以正确播放，你就直接用2进制工具copy一段出来就ok,判断播放多久，需要数里面有多少段，然后查看断头，看每个段可以放多久

[nonocast]

MAD

[winne_ll]

MP3文件任意截取一段数据就可以播放了，它会自动定位头信息的。

[13seele]

CComPtr< IMediaSeeking> pMS;
REFERENCE_TIME dr = 1000;
pMS->SetPositions(&dr, AM_SEEKING_AbsolutePositioning, NULL,AM_SEEKING_NoPositioning);
pMS->GetDuration(&dr);

[httpaspjspphp]

IMediaSeeking::GetDuration
The GetDuration method retrieves the duration of the stream.

Syntax

HRESULT GetDuration(
LONGLONG *pDuration
);

Parameters

pDuration

[out] Pointer to a variable that receives the duration, in units of the current time format.

IMediaSeeking::GetCurrentPosition
The GetCurrentPosition method retrieves the current position, relative to the total duration of the stream.

Syntax

HRESULT GetCurrentPosition(
LONGLONG *pCurrent
);

Parameters

pCurrent

[out] Pointer to a variable that receives the current position, in units of the current time format.

Return Value

Returns an HRESULT value. Possible values include the following.