Buffer creation from another buffer

[hauges]

I want to construct a new org.freedesktop.gstreamer.Buffer object with data from another Buffer. For example, with the python library, I could do something like this:

buffer = gst.Buffer(otherBuffer.data)

Is there any way I could do this using the java library?

[neilcsmith-net]

Is that copying the buffer data or creating a buffer that wraps the same data? Can you provide a link, ideally to the C API equivalent. You should be able to copy by creating a buffer and mapping the ByteBuffers, one with write, I think. You might also look at the GstBufferAPI in lowlevel to see if it provides anything extra you need.

[hauges]

I want to copy the buffer data and create a new buffer containing that data along with other data I pull from my system. I thinkGstBufferAPI.MapInfoStruct may be what I'm looking for (it has a data field), but I am too unfamiliar with the com.sun.jna.Pointer API to create a new GstBufferAPI.MapInfoStruct.

I couldn't find an equivalent C API, but this is the python documentation on buffer.data.

[hauges]

It also appears there is no way I can inject a MapInfoStruct into a Buffer.

[neilcsmith-net]

You don't need to use the structs, but we are missing low level mappings for copying.

You should be able to map the source buffer to get the ByteBuffer, create a new Buffer of that size, map the new buffer as writable, copy one ByteBuffer into the other, and unmap both. Not tried it though!

[hauges]

Thanks so much! Unfortunately my testing for this is now blocked by #133