[libcamera-devel] [PATCH v5 12/12] pipeline: raspberrypi: Add minimal memory usage config file
Kieran Bingham
kieran.bingham at ideasonboard.com
Fri Jan 20 12:25:52 CET 2023
Quoting Naushir Patuck via libcamera-devel (2023-01-18 08:59:53)
> Add a platform configuration file that allocates the least amount of frame
> buffer memory possible. This configuration does come with the following
> compromises:
>
> - Startup frame drops are disabled, so the first few frames will not have
> fully converged AE/AWB/ALSC applied.
>
> - Applications must provide ISP Output0 and Unicam Image (if a RAW stream is
> configured) buffers in requests.
This sounds like a configuration option that should prevent configuring
streams with the OptionalStream hint set.
>
> - Only 1 Unicam Image buffer will be allocated if a RAW stream is not
> configured, causing the framerate to be effectively halved.
>
> To use the configuration on the Raspberry Pi platform, invoke the application
> with the following prepended to the command line:
>
> LIBCAMERA_RPI_CONFIG_FILE=/usr/local/share/libcamera/pipeline/raspberrypi/minimal_mem.yaml
>
> Signed-off-by: Naushir Patuck <naush at raspberrypi.com>
> Reviewed-by: David Plowman <david.plowman at raspberrypi.com>
> ---
> .../pipeline/raspberrypi/data/meson.build | 1 +
> .../raspberrypi/data/minimal_mem.yaml | 29 +++++++++++++++++++
> 2 files changed, 30 insertions(+)
> create mode 100644 src/libcamera/pipeline/raspberrypi/data/minimal_mem.yaml
>
> diff --git a/src/libcamera/pipeline/raspberrypi/data/meson.build b/src/libcamera/pipeline/raspberrypi/data/meson.build
> index 1c70433bbcbc..6aecd8ae68c8 100644
> --- a/src/libcamera/pipeline/raspberrypi/data/meson.build
> +++ b/src/libcamera/pipeline/raspberrypi/data/meson.build
> @@ -2,6 +2,7 @@
>
> conf_files = files([
> 'example.yaml',
> + 'minimal_mem.yaml',
> ])
>
> install_data(conf_files,
> diff --git a/src/libcamera/pipeline/raspberrypi/data/minimal_mem.yaml b/src/libcamera/pipeline/raspberrypi/data/minimal_mem.yaml
> new file mode 100644
> index 000000000000..5cd593025140
> --- /dev/null
> +++ b/src/libcamera/pipeline/raspberrypi/data/minimal_mem.yaml
> @@ -0,0 +1,29 @@
> +{
> + "version": 1.0,
> + "target": "bcm2835",
> +
> + "pipeline_handler":
> + {
> + # The minimum number of internal buffers to be allocated for
> + # Unicam. This value must be greater than 0, but less than or
> + # equal to min_total_unicam_buffers.
> + "min_unicam_buffers": 0,
> +
> + # The minimum total (internal + external) buffer count used for
> + # Unicam. The number of internal buffers allocated for Unicam is
> + # given by:
> + #
> + # internal buffer count = max(min_unicam_buffers,
> + # min_total_unicam_buffers - external buffer count)
> + "min_total_unicam_buffers": 1,
> +
> + # Override any request from the IPA to drop a number of startup
> + # frames.
> + "disable_startup_frame_drops": true,
> +
> + # Always process a pending request with the last captured sensor
> + # frame. Note that this might lead to avoidable frame drops
> + # during periods of transient heavy CPU loading.
> + "return_newest_frames": false
It seems like there will be a lot of duplciation of the documentation..
But aside from that, I think this fits the previous patches so :
Reviewed-by: Kieran Bingham <kieran.bingham at ideasonboard.com>
> + }
> +}
> --
> 2.25.1
>
More information about the libcamera-devel
mailing list