[libcamera-devel] [PATCH v4 18/21] libcamera: uvcvideo: Fill stride and frameSize at config validation

[Jacopo Mondi]

Hi Paul,

On Wed, Jul 08, 2020 at 10:44:14PM +0900, Paul Elder wrote:
> Fill the stride and frameSize fields of the StreamConfiguration at
> configuration validation time instead of at camera configuration time.
> This allows applications to get the stride when trying a configuration
> without modifying the active configuration of the camera.
>
> Signed-off-by: Paul Elder <paul.elder at ideasonboard.com>
>

Reviewed-by: Jacopo Mondi <jacopo at jmondi.org>

Thanks
  j

> ---
> Changes in v4:
> - return error if tryFormat fails
> - pass UVCCameraData to UVCCameraConfiguration, instead of
>   V4l2VideoDevice
> - mention motivation in commit message
>
> New in v3
> ---
>  src/libcamera/pipeline/uvcvideo/uvcvideo.cpp | 23 +++++++++++++++-----
>  1 file changed, 18 insertions(+), 5 deletions(-)
>
> diff --git a/src/libcamera/pipeline/uvcvideo/uvcvideo.cpp b/src/libcamera/pipeline/uvcvideo/uvcvideo.cpp
> index 9db69dd..47f383d 100644
> --- a/src/libcamera/pipeline/uvcvideo/uvcvideo.cpp
> +++ b/src/libcamera/pipeline/uvcvideo/uvcvideo.cpp
> @@ -53,9 +53,12 @@ public:
>  class UVCCameraConfiguration : public CameraConfiguration
>  {
>  public:
> -	UVCCameraConfiguration();
> +	UVCCameraConfiguration(UVCCameraData *data);
>
>  	Status validate() override;
> +
> +private:
> +	UVCCameraData *data_;
>  };
>
>  class PipelineHandlerUVC : public PipelineHandler
> @@ -89,8 +92,8 @@ private:
>  	}
>  };
>
> -UVCCameraConfiguration::UVCCameraConfiguration()
> -	: CameraConfiguration()
> +UVCCameraConfiguration::UVCCameraConfiguration(UVCCameraData *data)
> +	: CameraConfiguration(), data_(data)
>  {
>  }
>
> @@ -141,6 +144,17 @@ CameraConfiguration::Status UVCCameraConfiguration::validate()
>
>  	cfg.bufferCount = 4;
>
> +	V4L2DeviceFormat format = {};
> +	format.fourcc = data_->video_->toV4L2PixelFormat(cfg.pixelFormat);
> +	format.size = cfg.size;
> +
> +	int ret = data_->video_->tryFormat(&format);
> +	if (ret)
> +		return Invalid;
> +
> +	cfg.stride = format.planes[0].bpl;
> +	cfg.frameSize = format.planes[0].size;
> +
>  	return status;
>  }
>
> @@ -153,7 +167,7 @@ CameraConfiguration *PipelineHandlerUVC::generateConfiguration(Camera *camera,
>  	const StreamRoles &roles)
>  {
>  	UVCCameraData *data = cameraData(camera);
> -	CameraConfiguration *config = new UVCCameraConfiguration();
> +	CameraConfiguration *config = new UVCCameraConfiguration(data);
>
>  	if (roles.empty())
>  		return config;
> @@ -200,7 +214,6 @@ int PipelineHandlerUVC::configure(Camera *camera, CameraConfiguration *config)
>  		return -EINVAL;
>
>  	cfg.setStream(&data->stream_);
> -	cfg.stride = format.planes[0].bpl;
>
>  	return 0;
>  }
> --
> 2.27.0
>
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