When importing dmabuf from downstream, we want the allocator to be in
OTHER_POOL mode despite output_mode being DMABUF.
So check first if other_pool is set before checking for pool's
output_mode.
Those debug infos have proved to be very helpful when debugging
timestamp issues. They are often linked to gst-omx picking the wrong
frame when trying to map from OMX.
One big restriction of the OMX buffer pool has always been
that the GstMemory objects were flagged with NO_SHARE.
This was because the buffer pool needed to be sure that when
a buffer returned to the pool, it would be safe to release the
OMX buffer back to OpenMAX.
With this change, this is no longer a restriction. What this
commit introduces is a new allocator that allows us to track
the GstMemory objects independently. Now, when a buffer returns
to the pool, it is not necessary for the memory to be released
as well. We simply track the memory's ref count in the allocator
and we return the OMX buffer back when the memory's ref count
drops to 0.
The reason for doing this is to allow implementing zero-copy
transfers in situations where we may need to copy or map a
certain region of the buffer. For instance, omxh264enc ! h264parse
should be possible to be zero-copy by using an OMX buffer pool
between them.
gst_memory_map() is already adding the offset to the mapped pointer.
Doing it in the memory implementation was resulting in the offset being
accounted twice.
It doesn't matter yet as we are only creating memory without offset for
now but it will once we'll start sharing OMX memories.
gstomx.c:1405:10: error: ‘OMX_IndexParamCustomContentPipe’ undeclared (first use in this function)
case OMX_IndexParamCustomContentPipe
Some enums have been deprecated in 1.2.0
https://gitlab.freedesktop.org/gstreamer/gst-omx/issues/27
gstomxvideoenc.c:2874:7: error: "USE_OMX_TARGET_ZYNQ_USCALE_PLUS" is not defined, evaluates to 0 [-Werror=undef]
#elif USE_OMX_TARGET_ZYNQ_USCALE_PLUS
Works on meson because it doesn't use -Wundef
This was the single place where this category was used in gst-omx so
most users, including me, are generally not turning it and were missing this
important information from logs.
The copying code uses gst_video_frame_copy() which is already logging
with CAT_PERFORMANCE so we can still have this information when using
only this debug category.
If buffers were released from the pool while
gst_omx_video_enc_handle_frame() was waiting for new buffers,
gst_omx_port_acquire_buffer() was never awaken as the buffers weren't
released through OMX's messaging system.
GQueue isn't thread safe so also protect it with the lock mutex.
We used to track the 'allocating' status on the pool. It is used while
allocating so output buffers aren't passed right away to OMX and input
ones are not re-added to the pending queue.
This was causing a bug when exporting buffers to v4l2src. On start
v4l2src acquires a buffer, read its stride and release it right away.
As no buffer was received by the encoder element at this point, 'allocating'
was still on TRUE and so the the buffer wasn't put back to the pending
queue and, as result, no longer available to the pool.
Fix this by checking the active status of the pool instead of manually
tracking it down. The pool is considered as active at the very end of
the activation process so we're good when buffers are released during
the activation.
The method we call in the context of pushing a buffer are all thread
safe. Holding a lock would prevent input buffers from being queued while
pushing.
https://bugzilla.gnome.org/show_bug.cgi?id=715192
The base class methods will lock this properly when needed, there seems
to be no need to lock it explicitly.
This allows the patch in gstvideodec for unlocking the stream lock
when pushing buffers out to work.
https://bugzilla.gnome.org/show_bug.cgi?id=715192
We already have code configuring the encoder stride and slice height
when receiving the first buffer from upstream.
We don't have an equivalent when the encoder is exporting its buffers to the
decoder.
There is no point adding it and making the code even more
complex as we wouldn't gain anything by exporting from the encoder to
the decoder. The dynamic buffer mode already ensures 0-copy between OMX
components.
https://bugzilla.gnome.org/show_bug.cgi?id=796918
Propose pool upstream so input buffers can be allocated by the port and
exported as dmabuf.
The actual OMX buffers are allocated when the pool is activated, so we
don't end up doing useless allocations if the pool isn't used.
https://bugzilla.gnome.org/show_bug.cgi?id=796918
The OMX transition state to Loaded won't be complete until all buffers
have been freed. There is no point waiting, and timeout, if we know that
output buffers haven't been freed yet.
The typical scenario is output buffers being still used downstream
and being freed later when released back to the pool.
https://bugzilla.gnome.org/show_bug.cgi?id=796918
Now that the pool is responsible of freeing the OMX buffers, we need to
ensure that the OMX component stay alive while the pool is as we rely on
the component to free the buffers.
The GstOMXPort is owned by the component so no need to ref this one.
https://bugzilla.gnome.org/show_bug.cgi?id=796918
The pool is stopped when all the buffers have been released. Deallocate
when stopping so we are sure that the buffers aren't still used by
another element.
https://bugzilla.gnome.org/show_bug.cgi?id=796918
