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android: camera_device: Calculate metadata size

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As we move to have more and more dynamically generated static metadata
entries, the size of the metadata buffer has to be calculated
dynamically inspecting the information collected from the camera.

Provide a method to perform metadata buffers size calculation and
use it when generating camera static metadata.

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
This commit is contained in:
Jacopo Mondi 2020-05-26 12:31:35 +02:00
parent 117588b371
commit a80d38109f
2 changed files with 30 additions and 6 deletions
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34
src/android/camera_device.cpp
View file

@ -8,6 +8,7 @@
#include "camera_device.h"
#include "camera_ops.h"
#include <tuple>
#include <vector>
#include <libcamera/controls.h>
@ -367,6 +368,29 @@ void CameraDevice::setCallbacks(const camera3_callback_ops_t *callbacks)
callbacks_ = callbacks;
}
std::tuple<uint32_t, uint32_t> CameraDevice::calculateStaticMetadataSize()
{
/*
* \todo Keep this in sync with the actual number of entries.
* Currently: 50 entries, 647 bytes of static metadata
*/
uint32_t numEntries = 50;
uint32_t byteSize = 647;
/*
* Calculate space occupation in bytes for dynamically built metadata
* entries.
*
* Each stream configuration entry requires 52 bytes:
* 4 32bits integers for ANDROID_SCALER_AVAILABLE_STREAM_CONFIGURATIONS
* 1 32bits integer for ANDROID_SCALER_AVAILABLE_FORMATS
* 4 64bits integers for ANDROID_SCALER_AVAILABLE_MIN_FRAME_DURATIONS
*/
byteSize += streamConfigurations_.size() * 52;
return { numEntries, byteSize };
}
/*
* Return static information for the camera.
*/
@ -380,12 +404,10 @@ const camera_metadata_t *CameraDevice::getStaticMetadata()
* example application, but a real camera implementation will require
* more.
*/
/*
* \todo Keep this in sync with the actual number of entries.
* Currently: 50 entries, 666 bytes
*/
staticMetadata_ = new CameraMetadata(50, 700);
uint32_t numEntries;
uint32_t byteSize;
std::tie(numEntries, byteSize) = calculateStaticMetadataSize();
staticMetadata_ = new CameraMetadata(numEntries, byteSize);
if (!staticMetadata_->isValid()) {
LOG(HAL, Error) << "Failed to allocate static metadata";
delete staticMetadata_;

2
src/android/camera_device.h
View file

@ -9,6 +9,7 @@
#include <map>
#include <memory>
#include <tuple>
#include <vector>
#include <hardware/camera3.h>
@ -68,6 +69,7 @@ private:
};
int initializeStreamConfigurations();
std::tuple<uint32_t, uint32_t> calculateStaticMetadataSize();
void notifyShutter(uint32_t frameNumber, uint64_t timestamp);
void notifyError(uint32_t frameNumber, camera3_stream_t *stream);
std::unique_ptr<CameraMetadata> getResultMetadata(int frame_number,