object doing the typefinding, or NULL (used for logging)
a gstreamer.Buffer with data to typefind
location to store the probability of the found caps, or NULL
the gstreamer.Caps corresponding to the data, or NULL if no type could be found. The caller should free the caps returned with Caps.unref.
Tries to find what type of data is contained in the given gstreamer.Buffer, the assumption being that the buffer represents the beginning of the stream or file.
All available typefinders will be called on the data in order of rank. If a typefinding function returns a probability of GST_TYPE_FIND_MAXIMUM, typefinding is stopped immediately and the found caps will be returned right away. Otherwise, all available typefind functions will the tried, and the caps with the highest probability will be returned, or NULL if the content of the buffer could not be identified.
Free-function: gst_caps_unref