Hi,
I have tied to use VAAPI + appsink with zero copy via DMABuf / mmap.
Therefore I used the following pipeline:
application/x-rtp, encoding-name=JPEG,payload=26 ! rtpjpegdepay !
vaapijpegdec ! capsfilter caps=video/x-raw(memory:DMABuf),format=I420
! appsink name=sink
Code form the appsink:
GstMemory* mem = gst_buffer_peek_memory(buffer, 0);
int fd = gst_dmabuf_memory_get_fd(mem);
void* map_data = mmap(NULL,size,PROT_READ |
PROT_WRITE,MAP_SHARED,fd,0);
However mmap fails with Permission Denied, because the buffer is not
writable.
I tried again with:
void* map_data = mmap(NULL,size,PROT_READ,MAP_SHARED,fd,0);
However the mapped data contains only zeros.
What am I missing?
Hardware is a Intel Atom E3950. Gstreamer 1.14.1
I also tried to to use VASurface,
but it is still unclear to me how to access data of a VASurface within
a appsink.
Many thanks
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