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<p>In Unix-like system you can use Tracker.</p>
<p>Im my project(QT) befor,I use tracker to get the mimetype of media.</p>
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<div style="DIRECTION: ltr" id="divRpF618183"><font color="#000000" size="2" face="Tahoma"><b>发件人:</b> gstreamer-devel-bounces+yinxb=neusoft.com@lists.freedesktop.org [gstreamer-devel-bounces+yinxb=neusoft.com@lists.freedesktop.org] 代表 Dinesh Iyer [dsi.maillist@gmail.com]<br>
<b>发送时间:</b> 2012年2月8日 8:03<br>
<b>收件人:</b> gstreamer-devel@lists.freedesktop.org<br>
<b>主题:</b> Extracting MIME type of compressed audio stream when using playbin<br>
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<div>Hello all,<br>
I am developing a cross platform application to read data and metadata from audio files. On Linux, I am using Gstreamer. I am using playbin2 to decode the data and assigning the "audio-sink" of the playbin to an appsink from which I retrieve the data. Is there
a way for me to extract the mime type of the compressed audio stream before it is decoded. The reason I need this is that I would like to provide a consistent naming for the actual audio format across all formats. On Windows using Media Foundation, I can key
off the media subtype. If I had access to the mime type of the compressed audio, I could key off this mime-type. An example code would look like:<br>
<br>
<span style="FONT-FAMILY: courier new,monospace">if( strstr(mimetype, "x-vorbis") != NULL )</span><br style="FONT-FAMILY: courier new,monospace">
<span style="FONT-FAMILY: courier new,monospace"> return "Vorbis";</span><br style="FONT-FAMILY: courier new,monospace">
<br style="FONT-FAMILY: courier new,monospace">
<span style="FONT-FAMILY: courier new,monospace">if( strstr(mimetype, "wma") != NULL )</span><br style="FONT-FAMILY: courier new,monospace">
<span style="FONT-FAMILY: courier new,monospace"> return "Windows Media Audio";</span><br>
<br>
The only way I see now is to read the GST_TAG_AUDIO_CODEC and search for string such as MP3, AAC which I do not feel is very robust.<br>
<br>
Any help would be appreciated.<br>
<br>
Regards,<br>
Dinesh<br>
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