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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Copyright (C) 2019, Google Inc.
*
* camera_session.cpp - Camera capture session
*/
#include <iomanip>
#include <iostream>
#include <limits.h>
#include <sstream>
#include <libcamera/control_ids.h>
#include "camera_session.h"
#include "event_loop.h"
#include "main.h"
using namespace libcamera;
CameraSession::CameraSession(std::shared_ptr<Camera> camera,
CameraConfiguration *config)
: camera_(camera), config_(config), last_(0), queueCount_(0),
captureCount_(0), captureLimit_(0), printMetadata_(false)
{
}
int CameraSession::start(const OptionsParser::Options &options)
{
int ret;
queueCount_ = 0;
captureCount_ = 0;
captureLimit_ = options[OptCapture].toInteger();
printMetadata_ = options.isSet(OptMetadata);
ret = camera_->configure(config_);
if (ret < 0) {
std::cout << "Failed to configure camera" << std::endl;
return ret;
}
streamName_.clear();
for (unsigned int index = 0; index < config_->size(); ++index) {
StreamConfiguration &cfg = config_->at(index);
streamName_[cfg.stream()] = "stream" + std::to_string(index);
}
camera_->requestCompleted.connect(this, &CameraSession::requestComplete);
if (options.isSet(OptFile)) {
if (!options[OptFile].toString().empty())
writer_ = std::make_unique<BufferWriter>(options[OptFile]);
else
writer_ = std::make_unique<BufferWriter>();
}
allocator_ = std::make_unique<FrameBufferAllocator>(camera_);
return startCapture();
}
void CameraSession::stop()
{
int ret = camera_->stop();
if (ret)
std::cout << "Failed to stop capture" << std::endl;
writer_.reset();
requests_.clear();
allocator_.reset();
}
int CameraSession::startCapture()
{
int ret;
/* Identify the stream with the least number of buffers. */
unsigned int nbuffers = UINT_MAX;
for (StreamConfiguration &cfg : *config_) {
ret = allocator_->allocate(cfg.stream());
if (ret < 0) {
std::cerr << "Can't allocate buffers" << std::endl;
return -ENOMEM;
}
unsigned int allocated = allocator_->buffers(cfg.stream()).size();
nbuffers = std::min(nbuffers, allocated);
}
/*
* TODO: make cam tool smarter to support still capture by for
* example pushing a button. For now run all streams all the time.
*/
for (unsigned int i = 0; i < nbuffers; i++) {
std::unique_ptr<Request> request = camera_->createRequest();
if (!request) {
std::cerr << "Can't create request" << std::endl;
return -ENOMEM;
}
for (StreamConfiguration &cfg : *config_) {
Stream *stream = cfg.stream();
const std::vector<std::unique_ptr<FrameBuffer>> &buffers =
allocator_->buffers(stream);
const std::unique_ptr<FrameBuffer> &buffer = buffers[i];
ret = request->addBuffer(stream, buffer.get());
if (ret < 0) {
std::cerr << "Can't set buffer for request"
<< std::endl;
return ret;
}
if (writer_)
writer_->mapBuffer(buffer.get());
}
requests_.push_back(std::move(request));
}
ret = camera_->start();
if (ret) {
std::cout << "Failed to start capture" << std::endl;
return ret;
}
for (std::unique_ptr<Request> &request : requests_) {
ret = queueRequest(request.get());
if (ret < 0) {
std::cerr << "Can't queue request" << std::endl;
camera_->stop();
return ret;
}
}
if (captureLimit_)
std::cout << "Capture " << captureLimit_ << " frames" << std::endl;
else
std::cout << "Capture until user interrupts by SIGINT" << std::endl;
return 0;
}
int CameraSession::queueRequest(Request *request)
{
if (captureLimit_ && queueCount_ >= captureLimit_)
return 0;
queueCount_++;
return camera_->queueRequest(request);
}
void CameraSession::requestComplete(Request *request)
{
if (request->status() == Request::RequestCancelled)
return;
/*
* Defer processing of the completed request to the event loop, to avoid
* blocking the camera manager thread.
*/
EventLoop::instance()->callLater([=]() { processRequest(request); });
}
void CameraSession::processRequest(Request *request)
{
const Request::BufferMap &buffers = request->buffers();
/*
* Compute the frame rate. The timestamp is arbitrarily retrieved from
* the first buffer, as all buffers should have matching timestamps.
*/
uint64_t ts = buffers.begin()->second->metadata().timestamp;
double fps = ts - last_;
fps = last_ != 0 && fps ? 1000000000.0 / fps : 0.0;
last_ = ts;
std::stringstream info;
info << ts / 1000000000 << "."
<< std::setw(6) << std::setfill('0') << ts / 1000 % 1000000
<< " (" << std::fixed << std::setprecision(2) << fps << " fps)";
for (auto it = buffers.begin(); it != buffers.end(); ++it) {
const Stream *stream = it->first;
FrameBuffer *buffer = it->second;
const std::string &name = streamName_[stream];
const FrameMetadata &metadata = buffer->metadata();
info << " " << name
<< " seq: " << std::setw(6) << std::setfill('0') << metadata.sequence
<< " bytesused: ";
unsigned int nplane = 0;
for (const FrameMetadata::Plane &plane : metadata.planes) {
info << plane.bytesused;
if (++nplane < metadata.planes.size())
info << "/";
}
if (writer_)
writer_->write(buffer, name);
}
std::cout << info.str() << std::endl;
if (printMetadata_) {
const ControlList &requestMetadata = request->metadata();
for (const auto &ctrl : requestMetadata) {
const ControlId *id = controls::controls.at(ctrl.first);
std::cout << "\t" << id->name() << " = "
<< ctrl.second.toString() << std::endl;
}
}
captureCount_++;
if (captureLimit_ && captureCount_ >= captureLimit_) {
captureDone.emit();
return;
}
request->reuse(Request::ReuseBuffers);
queueRequest(request);
}
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