[External] gstreamer videoconvert support gpu memory buffer

[Gaurav Vohra]

Discussion already started in different thread. Kindly ignore this as this was posted a day earlier before I joined this mailing list as member.

Thanks
Gaurav
From: gstreamer-devel <gstreamer-devel-bounces at lists.freedesktop.org> On Behalf Of Gaurav Vohra via gstreamer-devel
Sent: Tuesday, August 17, 2021 5:18 PM
To: gstreamer-devel at lists.freedesktop.org
Cc: Gaurav Vohra <Gaurav.Vohra at einfochips.com>
Subject: [External] gstreamer videoconvert support gpu memory buffer


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Hello,

I am working to customize gstreamer plugin to support

working to modify gstreamer plugin - videoconvert get obtain output data allocated as gpu memory allocated buffers.
As part of first step have modified the plugin to update the src template to include the gpu memory caps.
Allocation for gpu memory is done is transform_frame, but before that being called stream error and negotition is failing
Commented part
// #define CSP_VIDEO_CAPS GST_VIDEO_CAPS_MAKE (GST_VIDEO_FORMATS_ALL) ";" \
GST_VIDEO_CAPS_MAKE_WITH_FEATURES ("ANY", GST_VIDEO_FORMATS_ALL)
Modified part
#define CSP_VIDEO_CAPS_SRC GST_VIDEO_CAPS_MAKE (GST_VIDEO_FORMATS_ALL) ";" \
GST_VIDEO_CAPS_MAKE_WITH_FEATURES ("memory:GBM", GST_VIDEO_FORMATS_ALL)

//#define CSP_VIDEO_CAPS_SRC GST_VIDEO_CAPS_MAKE_WITH_FEATURES ("memory:GBM", GST_VIDEO_FORMATS_ALL)
static GstStaticPadTemplate gst_video_convert_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
    GST_PAD_SRC,
    GST_PAD_ALWAYS,
    GST_STATIC_CAPS (CSP_VIDEO_CAPS_SRC)
    );
While trying to run the playback pipeline getting errors related to negotitation and stream error like below
ERROR: from element /GstPipeline:pipeline0/GstV4l2Src:v4l2src0: Internal data stream error.
Additional debug info:
../../../../gstreamer-1.14.4/libs/gst/base/gstbasesrc.c(3055): gst_base_src_loop (): /GstPipeline:pipeline0/GstV4l2Src:v4l2src0:
streaming stopped, reason not-negotiated (-4)

Further debugging from logs suggest intersect of capsfilter input and the caps filter is coming as EMPTY

0:00:06.974521920  4320  0x10cde60 DEBUG             capsfilter gstcapsfilter.c:296:gst_capsfilter_transform_caps:<capsfilter0> input:     video/x-raw(memory:GBM), format=(string)NV12, width=(int)[ 1, 32767 ], height=(int)[ 1, 32767 ], framerate=(fraction)[ 0/1, 2147483647/1 ]; video/x-raw(memory:GBM), width=(int)[ 1, 32767 ], height=(int)[ 1, 32767 ], framerate=(fraction)[ 0/1, 2147483647/1 ], format=(string){ I420, YV12, YUY2, UYVY, AYUV, RGBx, BGRx, xRGB, xBGR, RGBA, BGRA, ARGB, ABGR, RGB, BGR, Y41B, Y42B, YVYU, Y444, v210, v216, NV12, NV21, GRAY8, GRAY16_BE, GRAY16_LE, v308, RGB16, BGR16, RGB15, BGR15, UYVP, A420, RGB8P, YUV9, YVU9, IYU1, ARGB64, AYUV64, r210, I420_10BE, I420_10LE, I422_10BE, I422_10LE, Y444_10BE, Y444_10LE, GBR, GBR_10BE, GBR_10LE, NV16, NV24, NV12_64Z32, A420_10BE, A420_10LE, A422_10BE, A422_10LE, A444_10BE, A444_10LE, NV61, P010_10BE, P010_10LE, IYU2, VYUY, GBRA, GBRA_10BE, GBRA_10LE, GBR_12BE, GBR_12LE, GBRA_12BE, GBRA_12LE, I420_12BE, I420_12LE, I422_12BE, I422_12LE, Y444_12BE, Y444_12LE, GRAY10_LE32, NV12_10LE32, NV16_10LE32 }
0:00:06.974569108  4320  0x10cde60 DEBUG             capsfilter gstcapsfilter.c:297:gst_capsfilter_transform_caps:<capsfilter0> filter:    (NULL)
0:00:06.974616661  4320  0x10cde60 DEBUG             capsfilter gstcapsfilter.c:299:gst_capsfilter_transform_caps:<capsfilter0> caps filter:    video/x-raw, width=(int)1280, height=(int)720, framerate=(fraction)15/2, format=(string)YUY2
0:00:06.974651037  4320  0x10cde60 DEBUG             capsfilter gstcapsfilter.c:300:gst_capsfilter_transform_caps:<capsfilter0> intersect: EMPTY

Regards
Gaurav
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