Summary:
This implementation is about to get supported audio/video codecs information 
for crosswalk on tizen. It's a part of device capabilities API.

Spec: http://device-capabilities.sysapps.org/



Affected component: xwalk/sysapps/device_capabilities



Related feature: https://crosswalk-project.org/jira/browse/XWALK-47



Target Release: Crosswalk M4



Implementation details:

Crosswalk for tizen has its own independent media playing pipeline. So, we 
can't use Tizen's media API. Here is our plan:



Utilize the existed API IsSupportedMediaMimeType, 
IsSupportedStrictMediaMimeType, AreSupportedMediaCodecs in 
src/net/base/mime_util.h to iterate a local codecs set which we maintain to 
check if the current codec is supported. If true, the codec will be added in 
the supported media codecs list. The checking logic will refer 
WebMimeRegistry's supportsMediaMIMEType function.



Thanks,

Qin, Jiajia

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