答复: Extracting MIME type of compressed audio stream when using playbin

[尹小彪（嵌入式软件事业部）]

In Unix-like system you can use Tracker.

Im my project(QT) befor,I use tracker to get the mimetype of media.

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发件人: gstreamer-devel-bounces+yinxb=neusoft.com at lists.freedesktop.org [gstreamer-devel-bounces+yinxb=neusoft.com at lists.freedesktop.org] 代表 Dinesh Iyer [dsi.maillist at gmail.com]
发送时间: 2012年2月8日 8:03
收件人: gstreamer-devel at lists.freedesktop.org
主题: Extracting MIME type of compressed audio stream when using playbin

Hello all,
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:

if( strstr(mimetype, "x-vorbis") != NULL )
 return "Vorbis";

if( strstr(mimetype, "wma") != NULL )
 return "Windows Media Audio";

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.

Any help would be appreciated.

Regards,
Dinesh
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