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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
* Copyright (C) 2019-2021, Google Inc.
*
* libcamera Android Camera Request Descriptor
*/
#include "camera_request.h"
#include <libcamera/base/span.h>
#include "camera_buffer.h"
using namespace libcamera;
/*
* \class Camera3RequestDescriptor
*
* A utility class that groups information about a capture request to be later
* reused at request complete time to notify the framework.
*
*******************************************************************************
* Lifetime of a Camera3RequestDescriptor tracking a capture request placed by
* Android Framework
*******************************************************************************
*
*
* Android Framework
* │
* │ ┌──────────────────────────────────┐
* │ │camera3_capture_request_t │
* │ │ │
* │ │Requested output streams │
* │ │ stream1 stream2 stream3 ... │
* │ └──────────────────────────────────┘
* ▼
* ┌─────────────────────────────────────────────────────────────┐
* │ libcamera HAL │
* ├─────────────────────────────────────────────────────────────┤
* │ CameraDevice │
* │ │
* │ processCaptureRequest(camera3_capture_request_t request) │
* │ │
* │ - Create Camera3RequestDescriptor tracking this request │
* │ - Streams requiring post-processing are stored in the │
* │ pendingStreamsToProcess map │
* │ - Add this Camera3RequestDescriptor to descriptors' queue │
* │ CameraDevice::descriptors_ │
* │ │ ┌─────────────────────────┐
* │ - Queue the capture request to libcamera core ────────────┤►│libcamera core │
* │ │ ├─────────────────────────┤
* │ │ │- Capture from Camera │
* │ │ │ │
* │ │ │- Emit │
* │ │ │ Camera::requestComplete│
* │ requestCompleted(Request *request) ◄───────────────────────┼─┼──── │
* │ │ │ │
* │ - Check request completion status │ └─────────────────────────┘
* │ │
* │ - if (pendingStreamsToProcess > 0) │
* │ Queue all entries from pendingStreamsToProcess │
* │ else │ │
* │ completeDescriptor() │ └──────────────────────┐
* │ │ │
* │ ┌──────────────────────────┴───┬──────────────────┐ │
* │ │ │ │ │
* │ ┌──────────▼────────────┐ ┌───────────▼─────────┐ ▼ │
* │ │CameraStream1 │ │CameraStream2 │ .... │
* │ ├┬───┬───┬──────────────┤ ├┬───┬───┬────────────┤ │
* │ ││ │ │ │ ││ │ │ │ │
* │ │▼───▼───▼──────────────┤ │▼───▼───▼────────────┤ │
* │ │PostProcessorWorker │ │PostProcessorWorker │ │
* │ │ │ │ │ │
* │ │ +------------------+ │ │ +------------------+│ │
* │ │ | PostProcessor | │ │ | PostProcessor |│ │
* │ │ | process() | │ │ | process() |│ │
* │ │ | | │ │ | |│ │
* │ │ | Emit | │ │ | Emit |│ │
* │ │ | processComplete | │ │ | processComplete |│ │
* │ │ | | │ │ | |│ │
* │ │ +--------------│---+ │ │ +--------------│---+│ │
* │ │ │ │ │ │ │ │
* │ │ │ │ │ │ │ │
* │ └────────────────┼──────┘ └────────────────┼────┘ │
* │ │ │ │
* │ │ │ │
* │ │ │ │
* │ ▼ ▼ │
* │ +---------------------------------------+ +--------------+ │
* │ | CameraDevice | | | │
* │ | | | | │
* │ | streamProcessingComplete() | | | │
* │ | | | | │
* │ | - Check and set buffer status | | .... | │
* │ | - Remove post+processing entry | | | │
* │ | from pendingStreamsToProcess | | | │
* │ | | | | │
* │ | - if (pendingStreamsToProcess.empty())| | | │
* │ | completeDescriptor | | | │
* │ | | | | │
* │ +---------------------------------------+ +--------------+ │
* │ │
* └────────────────────────────────────────────────────────────────────────────────────┘
*
* +-------------+
* | | - PostProcessorWorker's thread
* | |
* +-------------+
*/
Camera3RequestDescriptor::Camera3RequestDescriptor(
Camera *camera, const camera3_capture_request_t *camera3Request)
{
frameNumber_ = camera3Request->frame_number;
/* Copy the camera3 request stream information for later access. */
const Span<const camera3_stream_buffer_t> buffers{
camera3Request->output_buffers,
camera3Request->num_output_buffers
};
buffers_.reserve(buffers.size());
for (const camera3_stream_buffer_t &buffer : buffers) {
CameraStream *stream =
static_cast<CameraStream *>(buffer.stream->priv);
buffers_.emplace_back(stream, buffer, this);
}
/* Clone the controls associated with the camera3 request. */
settings_ = CameraMetadata(camera3Request->settings);
/*
* Create the CaptureRequest, stored as a unique_ptr<> to tie its
* lifetime to the descriptor.
*/
request_ = camera->createRequest(reinterpret_cast<uint64_t>(this));
}
Camera3RequestDescriptor::~Camera3RequestDescriptor() = default;
/**
* \struct Camera3RequestDescriptor::StreamBuffer
* \brief Group information for per-stream buffer of Camera3RequestDescriptor
*
* A capture request placed to the libcamera HAL can contain multiple streams.
* Each stream will have an associated buffer to be filled. StreamBuffer
* tracks this buffer with contextual information which aids in the stream's
* generation. The generation of the stream will depend on its type (refer to
* the CameraStream::Type documentation).
*
* \var Camera3RequestDescriptor::StreamBuffer::stream
* \brief Pointer to the corresponding CameraStream
*
* \var Camera3RequestDescriptor::StreamBuffer::camera3Buffer
* \brief Native handle to the buffer
*
* \var Camera3RequestDescriptor::StreamBuffer::frameBuffer
* \brief Encapsulate the dmabuf handle inside a libcamera::FrameBuffer for
* direct streams
*
* \var Camera3RequestDescriptor::StreamBuffer::fence
* \brief Acquire fence of the buffer
*
* \var Camera3RequestDescriptor::StreamBuffer::status
* \brief Track the status of the buffer
*
* \var Camera3RequestDescriptor::StreamBuffer::internalBuffer
* \brief Pointer to a buffer internally handled by CameraStream (if any)
*
* \var Camera3RequestDescriptor::StreamBuffer::srcBuffer
* \brief Pointer to the source frame buffer used for post-processing
*
* \var Camera3RequestDescriptor::StreamBuffer::dstBuffer
* \brief Pointer to the destination frame buffer used for post-processing
*
* \var Camera3RequestDescriptor::StreamBuffer::request
* \brief Back pointer to the Camera3RequestDescriptor to which the StreamBuffer belongs
*/
Camera3RequestDescriptor::StreamBuffer::StreamBuffer(
CameraStream *cameraStream, const camera3_stream_buffer_t &buffer,
Camera3RequestDescriptor *requestDescriptor)
: stream(cameraStream), camera3Buffer(buffer.buffer),
fence(buffer.acquire_fence), request(requestDescriptor)
{
}
Camera3RequestDescriptor::StreamBuffer::~StreamBuffer() = default;
Camera3RequestDescriptor::StreamBuffer::StreamBuffer(StreamBuffer &&) = default;
Camera3RequestDescriptor::StreamBuffer &
Camera3RequestDescriptor::StreamBuffer::operator=(Camera3RequestDescriptor::StreamBuffer &&) = default;