Our encoder implementation actually supports a small subset of the
formats supported by the decoder. Those are the formats for which we
have a copy path in gst_omx_video_enc_fill_buffer() and which are not
filtered out in filter_supported_formats().
Coverity was complaining with:
Null pointer dereferences (REVERSE_INULL) Null-checking "frame"
suggests that it may be null, but it has already been
dereferenced on all paths leading to the check.
The frame == NULL has been removed as 'frame' is actively used
in the code above without any change of dereferencing and setting
its value to NULL before the test.
CID: 1461287
Does not change anything for now but will be needed when we'll support
interlace-mode=alternate as the field rate will be twice the frame rate.
Made the code safe from division by 0 while I was on it.
This patch adds look-ahead property to encoder
The value indicates look ahead size in frames,
the number of frames processed ahead of second pass encoding.
Dual pass encoding is disabled if look-ahead
value is less than 2.
Custom API that upstream elements can use to notify encoders about
marking longterm ref. pictures or using longterm ref. pictures in
encoding process.
This patch adds below properties:
long-term-ref: Enable/Disable dynamically marking long-term
reference pictures in encoding process
long-term-freq: Periodicity of long-term reference picture
marking in encoding process.
If a picture is marked as long-term reference picture then it remains
in the DPB list for ever unless it overrides with new long-term pitcure with
same index. Encoder can use this long-term picture as refence for
encoding.
This feature is mostly useful to avoid visual artifacts propagation in streaming use cases
when packet loss happens. Instead of requesting for IDR, client can request for use long-term
reference picture for encoding.
By passing the expected video buffer layout, the upstream producer
may be able to produce buffers fitting those requierements allowing
gst-omx to use dynamic buffer mode rather than having to copy each input
buffer.
This is particularly useful with v4l2src as it can request the capture
driver to produce buffers with the required paddings.
Fixing a regression introduced in my previous patch
(7c40a91c31).
The ALLOCATION query needs to be handled by GstVideoEncoder (to call
propose_allocation()) so chain up the query handling rather than early
returning.
Ensure that the encoder releases all its input buffers when requested by
upstream. Encoder input buffers may be shared with downstreaming (when
using dmabuf), upstream may then request the encoder to
drain when reconfiguring before destroying its buffers.
Also drain on ALLOCATION query as we already do in kmssink as that
notify of a format change.
Fix "decoder ! encoder" pipeline when decoding a file with different
resolutions on Zynq.
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.
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
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
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
This is no longer needed since we implemented close() vfuncs as the
encoder/decoder base class already take care of calling close() (which
is calling shutdown()) in its own change_state implementation.
We also move the shut down of the component from PAUSED_TO_READY to READY_TO_NULL.
By doing so upstream will have already deactivated the pool from the
encoder and so won't be preventing the OMX state change as the buffers
will all be released.
https://bugzilla.gnome.org/show_bug.cgi?id=796918
As stated in the spec ("6.1.3 Seek Event Sequence") we should pause
before flushing.
We were pausing the decoder but not the encoder so I just aligned the
two code paths.
https://bugzilla.gnome.org/show_bug.cgi?id=797038
According to the OMX spec (3.1.3.7.1) nFilledLen is meant to include any
padding. We use to include the horizontal one (stride) but not the
vertical one if nSliceHeight is bigger than the actual height.
The calculated nFilledLen was wrong as it didn't include the padding
between planes.
https://bugzilla.gnome.org/show_bug.cgi?id=796749
Increase the number of output buffers by the number of buffers requested
downstream.
Prevent buffers starvation if downstream is going to use dynamic buffer
mode on its input.
https://bugzilla.gnome.org/show_bug.cgi?id=795746
The OMX specs states that the nBufferCountActual of a port has to default
to its nBufferCountMin. If we don't change nBufferCountActual we purely rely
on this default. But in some cases, OMX may change nBufferCountMin before we
allocate buffers. Like for example when configuring the input ports with the
actual format, it may decrease the number of minimal buffers required.
This method checks this and update nBufferCountActual if needed so we'll use
less buffers than the worst case in such scenarios.
SetParameter() needs to be called when the port is either disabled or
the component in the Loaded state.
Don't do this for the decoder output as
gst_omx_video_dec_allocate_output_buffers() already check
nBufferCountMin when computing the number of output buffers.
On some platform, like rpi, the default nBufferCountActual is much
higher than nBufferCountMin so only enable this using a specific gst-omx
hack.
https://bugzilla.gnome.org/show_bug.cgi?id=791211
Setting the input format and the associated encoder/decoder settings
may also affect the nBufferCountMin of the input port.
Refresh the input port so we'll use up to date values in propose/decide
allocation.
https://bugzilla.gnome.org/show_bug.cgi?id=796445
