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libcamera: pipeline_handler: Prepare Request

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Before queueing a request to the device, any synchronization fence from
the Request framebuffers has to be waited on.

Connect the Request::Private::prepared signal to the function that
queues requests to the hardware and call Request::Private::prepare().

When the waiting request queue is inspected, verify if it has completed its
preparation phase and queue it to the device.

Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
This commit is contained in:
Jacopo Mondi 2021-10-27 18:34:46 +02:00
parent 3fb3c0d791
commit 7aef77130a
1 changed files with 29 additions and 8 deletions
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37
src/libcamera/pipeline_handler.cpp
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@ -7,6 +7,7 @@
#include "libcamera/internal/pipeline_handler.h"
#include <chrono>
#include <sys/sysmacros.h>
#include <libcamera/base/log.h>
@ -18,6 +19,7 @@
#include "libcamera/internal/camera.h"
#include "libcamera/internal/device_enumerator.h"
#include "libcamera/internal/framebuffer.h"
#include "libcamera/internal/media_device.h"
#include "libcamera/internal/request.h"
#include "libcamera/internal/tracepoints.h"
@ -36,6 +38,8 @@
* the REGISTER_PIPELINE_HANDLER() macro.
*/
using namespace std::chrono_literals;
namespace libcamera {
LOG_DEFINE_CATEGORY(Pipeline)
@ -323,10 +327,16 @@ bool PipelineHandler::hasPendingRequests(const Camera *camera) const
* \param[in] request The request to queue
*
* This function queues a capture request to the pipeline handler for
* processing. The request is first added to the internal list of queued
* requests, and then passed to the pipeline handler with a call to
* queueRequestDevice(). If the pipeline handler fails in queuing the request
* to the hardware the request is cancelled.
* processing. The request is first added to the internal list of waiting
* requests which have to be prepared to make sure they are ready for being
* queued to the pipeline handler.
*
* The queue of waiting requests is iterated and all prepared requests are
* passed to the pipeline handler in the same order they have been queued by
* calling this function.
*
* If a Request fails during the preparation phase or if the pipeline handler
* fails in queuing the request to the hardware the request is cancelled.
*
* Keeping track of queued requests ensures automatic completion of all requests
* when the pipeline handler is stopped with stop(). Request completion shall be
@ -339,7 +349,11 @@ void PipelineHandler::queueRequest(Request *request)
LIBCAMERA_TRACEPOINT(request_queue, request);
waitingRequests_.push(request);
doQueueRequests();
request->_d()->prepared.connect(this, [this]() {
doQueueRequests();
});
request->_d()->prepare(300ms);
}
/**
@ -355,6 +369,11 @@ void PipelineHandler::doQueueRequest(Request *request)
request->_d()->sequence_ = data->requestSequence_++;
if (request->_d()->cancelled_) {
completeRequest(request);
return;
}
int ret = queueRequestDevice(camera, request);
if (ret) {
request->_d()->cancel();
@ -363,18 +382,20 @@ void PipelineHandler::doQueueRequest(Request *request)
}
/**
* \brief Queue requests to the device
* \brief Queue prepared requests to the device
*
* Iterate the list of waiting requests and queue them to the device one
* by one.
* by one if they have been prepared.
*/
void PipelineHandler::doQueueRequests()
{
while (!waitingRequests_.empty()) {
Request *request = waitingRequests_.front();
waitingRequests_.pop();
if (!request->_d()->prepared_)
break;
doQueueRequest(request);
waitingRequests_.pop();
}
}