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5423e2d220
Reference frame compression is a feature added in the G2 decoder to
compress frame buffers so that the bandwidth of storing/loading
reference frames can be reduced, especially with high resolution decoded
streams.
The impact of compressed frames is confirmed when using perf to monitor
the number of memory accesses with or without the compression feature.
The following command:
perf stat -a -e \
imx8_ddr0/cycles/,imx8_ddr0/read-cycles/,imx8_ddr0/write-cycles/ \
gst-launch-1.0 filesrc \
location=Jockey_3840x2160_120fps_420_8bit_HEVC_RAW.hevc ! queue ! \
h265parse ! v4l2slh265dec ! video/x-raw,format=NV12 ! fakesink
Gives us these results without the compression feature:
Performance counter stats for 'system wide':
1711300345 imx8_ddr0/cycles/
892207924 imx8_ddr0/read-cycles/
1291785864 imx8_ddr0/write-cycles/
13.760048353 seconds time elapsed
With the compression feature:
Performance counter stats for 'system wide':
274526799 imx8_ddr0/cycles/
453120194 imx8_ddr0/read-cycles/
833391434 imx8_ddr0/write-cycles/
18.257831534 seconds time elapsed
As expected the number of read/write cycles are really lower when
compression is used.
Since storing the compression data requires more memory a module
parameter named 'hevc_use_compression' is used to enable/disable
this feature and, by default, compression isn't used.
Enabling the compression feature means that the output-frames of the
decoder
are stored with a specific compression pixel-format. Since this
pixel format is unknown, this patch restrains the compression feature
usage to the cases where post-processor pixel-formats (NV12 or NV15)
are selected by the applications.
The Fluster compliance HEVC test suite score is still 141/147 with this
patch.
Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
Tested-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Signed-off-by: Sebastian Fricke <sebastian.fricke@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
71 lines
1.9 KiB
Plaintext
71 lines
1.9 KiB
Plaintext
# SPDX-License-Identifier: GPL-2.0-only
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comment "Verisilicon media platform drivers"
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config VIDEO_HANTRO
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tristate "Hantro VPU driver"
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depends on ARCH_MXC || ARCH_ROCKCHIP || ARCH_AT91 || ARCH_SUNXI || ARCH_STM32 || COMPILE_TEST
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depends on V4L_MEM2MEM_DRIVERS
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depends on VIDEO_DEV
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select MEDIA_CONTROLLER
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select VIDEOBUF2_DMA_CONTIG
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select VIDEOBUF2_VMALLOC
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select V4L2_MEM2MEM_DEV
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select V4L2_H264
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select V4L2_JPEG_HELPER
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select V4L2_VP9
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help
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Support for the Hantro IP based Video Processing Units present on
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Rockchip, NXP i.MX8M and STM32MP25 SoCs, which accelerate video
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and image encoding and decoding.
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To compile this driver as a module, choose M here: the module
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will be called hantro-vpu.
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config VIDEO_HANTRO_HEVC_RFC
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bool "Use reference frame compression for HEVC"
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depends on VIDEO_HANTRO
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default n
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help
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Enable the reference frame compression feature for the HEVC codec.
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It will use more memory but save bandwidth on memory bus.
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config VIDEO_HANTRO_IMX8M
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bool "Hantro VPU i.MX8M support"
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depends on VIDEO_HANTRO
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depends on ARCH_MXC || COMPILE_TEST
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default y
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help
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Enable support for i.MX8M SoCs.
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config VIDEO_HANTRO_SAMA5D4
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bool "Hantro VDEC SAMA5D4 support"
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depends on VIDEO_HANTRO
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depends on ARCH_AT91 || COMPILE_TEST
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default y
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help
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Enable support for Microchip SAMA5D4 SoCs.
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config VIDEO_HANTRO_ROCKCHIP
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bool "Hantro VPU Rockchip support"
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depends on VIDEO_HANTRO
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depends on ARCH_ROCKCHIP || COMPILE_TEST
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default y
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help
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Enable support for RK3288, RK3328, and RK3399 SoCs.
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config VIDEO_HANTRO_SUNXI
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bool "Hantro VPU Allwinner support"
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depends on VIDEO_HANTRO
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depends on ARCH_SUNXI || COMPILE_TEST
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default y
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help
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Enable support for H6 SoC.
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config VIDEO_HANTRO_STM32MP25
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bool "Hantro STM32MP25 support"
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depends on VIDEO_HANTRO
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depends on ARCH_STM32 || COMPILE_TEST
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default y
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help
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Enable support for STM32MP25 SoCs.
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