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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
* Copyright (C) 2020, Raspberry Pi (Trading) Ltd.
*
* rpi_stream.cpp - Raspberry Pi device stream abstraction class.
*/
#include "rpi_stream.h"
#include <libcamera/base/log.h>
#include <libcamera/ipa/raspberrypi_ipa_interface.h>
namespace libcamera {
LOG_DEFINE_CATEGORY(RPISTREAM)
namespace RPi {
V4L2VideoDevice *Stream::dev() const
{
return dev_.get();
}
std::string Stream::name() const
{
return name_;
}
void Stream::reset()
{
external_ = false;
clearBuffers();
}
void Stream::setExternal(bool external)
{
/* Import streams cannot be external. */
ASSERT(!external || !importOnly_);
external_ = external;
}
bool Stream::isExternal() const
{
return external_;
}
void Stream::setExportedBuffers(std::vector<std::unique_ptr<FrameBuffer>> *buffers)
{
for (auto const &buffer : *buffers)
bufferMap_.emplace(id_.get(), buffer.get());
}
const BufferMap &Stream::getBuffers() const
{
return bufferMap_;
}
int Stream::getBufferId(FrameBuffer *buffer) const
{
if (importOnly_)
return -1;
/* Find the buffer in the map, and return the buffer id. */
auto it = std::find_if(bufferMap_.begin(), bufferMap_.end(),
[&buffer](auto const &p) { return p.second == buffer; });
if (it == bufferMap_.end())
return -1;
return it->first;
}
void Stream::setExternalBuffer(FrameBuffer *buffer)
{
bufferMap_.emplace(ipa::RPi::MaskExternalBuffer | id_.get(), buffer);
}
void Stream::removeExternalBuffer(FrameBuffer *buffer)
{
int id = getBufferId(buffer);
/* Ensure we have this buffer in the stream, and it is marked external. */
ASSERT(id != -1 && (id & ipa::RPi::MaskExternalBuffer));
bufferMap_.erase(id);
}
int Stream::prepareBuffers(unsigned int count)
{
int ret;
if (!importOnly_) {
if (count) {
/* Export some frame buffers for internal use. */
ret = dev_->exportBuffers(count, &internalBuffers_);
if (ret < 0)
return ret;
/* Add these exported buffers to the internal/external buffer list. */
setExportedBuffers(&internalBuffers_);
/* Add these buffers to the queue of internal usable buffers. */
for (auto const &buffer : internalBuffers_)
availableBuffers_.push(buffer.get());
}
/* We must import all internal/external exported buffers. */
count = bufferMap_.size();
}
/*
* If this is an external stream, we must allocate slots for buffers that
* might be externally allocated. We have no indication of how many buffers
* may be used, so this might overallocate slots in the buffer cache.
*
* \todo Find a better heuristic, or, even better, an exact solution to
* this issue.
*/
if (isExternal())
count = count * 2;
return dev_->importBuffers(count);
}
int Stream::queueBuffer(FrameBuffer *buffer)
{
/*
* A nullptr buffer implies an external stream, but no external
* buffer has been supplied in the Request. So, pick one from the
* availableBuffers_ queue.
*/
if (!buffer) {
if (availableBuffers_.empty()) {
LOG(RPISTREAM, Debug) << "No buffers available for "
<< name_;
/*
* Note that we need to queue an internal buffer as soon
* as one becomes available.
*/
requestBuffers_.push(nullptr);
return 0;
}
buffer = availableBuffers_.front();
availableBuffers_.pop();
}
/*
* If no earlier requests are pending to be queued we can go ahead and
* queue this buffer into the device.
*/
if (requestBuffers_.empty())
return queueToDevice(buffer);
/*
* There are earlier Request buffers to be queued, so this buffer must go
* on the waiting list.
*/
requestBuffers_.push(buffer);
return 0;
}
void Stream::returnBuffer(FrameBuffer *buffer)
{
/* This can only be called for external streams. */
ASSERT(external_);
/* Push this buffer back into the queue to be used again. */
availableBuffers_.push(buffer);
/* Allow the buffer id to be reused. */
id_.release(getBufferId(buffer));
/*
* Do we have any Request buffers that are waiting to be queued?
* If so, do it now as availableBuffers_ will not be empty.
*/
while (!requestBuffers_.empty()) {
FrameBuffer *requestBuffer = requestBuffers_.front();
if (!requestBuffer) {
/*
* We want to queue an internal buffer, but none
* are available. Can't do anything, quit the loop.
*/
if (availableBuffers_.empty())
break;
/*
* We want to queue an internal buffer, and at least one
* is available.
*/
requestBuffer = availableBuffers_.front();
availableBuffers_.pop();
}
requestBuffers_.pop();
queueToDevice(requestBuffer);
}
}
int Stream::queueAllBuffers()
{
int ret;
if (external_)
return 0;
while (!availableBuffers_.empty()) {
ret = queueBuffer(availableBuffers_.front());
if (ret < 0)
return ret;
availableBuffers_.pop();
}
return 0;
}
void Stream::releaseBuffers()
{
dev_->releaseBuffers();
clearBuffers();
}
void Stream::clearBuffers()
{
availableBuffers_ = std::queue<FrameBuffer *>{};
requestBuffers_ = std::queue<FrameBuffer *>{};
internalBuffers_.clear();
bufferMap_.clear();
id_.reset();
}
int Stream::queueToDevice(FrameBuffer *buffer)
{
LOG(RPISTREAM, Debug) << "Queuing buffer " << getBufferId(buffer)
<< " for " << name_;
int ret = dev_->queueBuffer(buffer);
if (ret)
LOG(RPISTREAM, Error) << "Failed to queue buffer for "
<< name_;
return ret;
}
} /* namespace RPi */
} /* namespace libcamera */
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