[libcamera-devel] [PATCH v3 8/9] android: camera_device: Fill offset and right length in CreateFrameBuffer()

[Laurent Pinchart]

Hi Hiro,

Thank you for the patch.

On Thu, Aug 26, 2021 at 08:25:38PM +0900, Hirokazu Honda wrote:
> CameraDevice::CreateFrameBuffer() fills the length of the buffer to
> each FrameBuffer::Plane::length. It should rather be the length of
> plane. This also changes CreateFrameBuffer() to fill offset of
> FrameBuffer::Plane.
> 
> Signed-off-by: Hirokazu Honda <hiroh at chromium.org>
> Reviewed-by: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
> ---
>  src/android/camera_device.cpp | 52 +++++++++++++++++++++--------------
>  src/android/camera_device.h   |  6 +++-
>  2 files changed, 37 insertions(+), 21 deletions(-)
> 
> diff --git a/src/android/camera_device.cpp b/src/android/camera_device.cpp
> index a69b687a..4702b332 100644
> --- a/src/android/camera_device.cpp
> +++ b/src/android/camera_device.cpp
> @@ -12,6 +12,7 @@
>  
>  #include <algorithm>
>  #include <fstream>
> +#include <sys/mman.h>
>  #include <unistd.h>
>  #include <vector>
>  
> @@ -744,31 +745,40 @@ int CameraDevice::configureStreams(camera3_stream_configuration_t *stream_list)
>  	return 0;
>  }
>  
> -FrameBuffer *CameraDevice::createFrameBuffer(const buffer_handle_t camera3buffer)
> +FrameBuffer *CameraDevice::createFrameBuffer(const buffer_handle_t camera3buffer,
> +					     libcamera::PixelFormat pixelFormat,
> +					     const libcamera::Size &size)
>  {
> -	std::vector<FrameBuffer::Plane> planes;
> +	FileDescriptor fd;
> +	/*
> +	 * This assumes all the planes are in the same dmabuf.
> +	 *
> +         * \todo Verify that this assumption holds, fstat() can be used to check
> +         * if two fds refer to the same dmabuf.

Tabs for indentation. I can fix this when pushing the series.

> +	 */
>  	for (int i = 0; i < camera3buffer->numFds; i++) {
> -		/* Skip unused planes. */
> -		if (camera3buffer->data[i] == -1)
> +		if (camera3buffer->data[i] != -1) {
> +			fd = FileDescriptor(camera3buffer->data[i]);
>  			break;
> -
> -		FrameBuffer::Plane plane;
> -		plane.fd = FileDescriptor(camera3buffer->data[i]);
> -		if (!plane.fd.isValid()) {
> -			LOG(HAL, Error) << "Failed to obtain FileDescriptor ("
> -					<< camera3buffer->data[i] << ") "
> -					<< " on plane " << i;
> -			return nullptr;
>  		}
> +	}
>  
> -		off_t length = lseek(plane.fd.fd(), 0, SEEK_END);
> -		if (length == -1) {
> -			LOG(HAL, Error) << "Failed to query plane length";
> -			return nullptr;
> -		}
> +	if (!fd.isValid()) {
> +		LOG(HAL, Fatal) << "No valid fd";
> +		return nullptr;
> +	}
> +
> +	CameraBuffer buf(camera3buffer, pixelFormat, size, PROT_READ);
> +	if (!buf.isValid()) {
> +		LOG(HAL, Fatal) << "Failed to create CameraBuffer";
> +		return nullptr;
> +	}
>  
> -		plane.length = length;
> -		planes.push_back(std::move(plane));
> +	std::vector<FrameBuffer::Plane> planes(buf.numPlanes());
> +	for (size_t i = 0; i < buf.numPlanes(); ++i) {
> +		planes[i].fd = fd;
> +		planes[i].offset = buf.offset(i);
> +		planes[i].length = buf.size(i);
>  	}
>  
>  	return new FrameBuffer(std::move(planes));
> @@ -976,7 +986,9 @@ int CameraDevice::processCaptureRequest(camera3_capture_request_t *camera3Reques
>  			 * associate it with the Camera3RequestDescriptor for
>  			 * lifetime management only.
>  			 */
> -			buffer = createFrameBuffer(*camera3Buffer.buffer);
> +			buffer = createFrameBuffer(*camera3Buffer.buffer,
> +						   cameraStream->configuration().pixelFormat,
> +						   cameraStream->configuration().size);
>  			descriptor.frameBuffers_.emplace_back(buffer);
>  			LOG(HAL, Debug) << ss.str() << " (direct)";
>  			break;
> diff --git a/src/android/camera_device.h b/src/android/camera_device.h
> index dd9aebba..a5576927 100644
> --- a/src/android/camera_device.h
> +++ b/src/android/camera_device.h
> @@ -21,6 +21,8 @@
>  
>  #include <libcamera/camera.h>
>  #include <libcamera/framebuffer.h>
> +#include <libcamera/geometry.h>
> +#include <libcamera/pixel_format.h>
>  #include <libcamera/request.h>
>  #include <libcamera/stream.h>
>  
> @@ -91,7 +93,9 @@ private:
>  
>  	void stop();
>  
> -	libcamera::FrameBuffer *createFrameBuffer(const buffer_handle_t camera3buffer);
> +	libcamera::FrameBuffer *createFrameBuffer(const buffer_handle_t camera3buffer,
> +						  libcamera::PixelFormat pixelFormat,
> +						  const libcamera::Size &size);
>  	void abortRequest(camera3_capture_request_t *request);
>  	bool isValidRequest(camera3_capture_request_t *request) const;
>  	void notifyShutter(uint32_t frameNumber, uint64_t timestamp);

-- 
Regards,

Laurent Pinchart