CMSimpleQueue.h
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/* akvirtualcamera, virtual camera for Mac and Windows.
* Copyright (C) 2024 Gonzalo Exequiel Pedone
*
* akvirtualcamera is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* akvirtualcamera is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with akvirtualcamera. If not, see <http://www.gnu.org/licenses/>.
*
* Web-Site: http://webcamoid.github.io/
*/
#ifndef COREMEDIA_CMSIMPLEQUEUE_H
#define COREMEDIA_CMSIMPLEQUEUE_H
#include <queue>
#include "CoreFoundation/Allocators.h"
#include "CoreFoundation/CFType.h"
using CMSimpleQueue = CFType;
using CMSimpleQueueRef = CFTypeRef;
struct _CMSimpleQueueData
{
std::queue<const void *> items;
int32_t capacity;
_CMSimpleQueueData(int32_t capacity):
capacity(capacity)
{
}
};
using _CMSimpleQueueDataRef = _CMSimpleQueueData *;
inline CFTypeID CMSimpleQueueGetTypeID()
{
return 0x5;
}
inline OSStatus CMSimpleQueueCreate(CFAllocatorRef allocator,
int32_t capacity,
CMSimpleQueueRef *queueOut)
{
auto self = new CMSimpleQueue;
self->type = CMSimpleQueueGetTypeID();
self->data = new _CMSimpleQueueData(capacity);
self->size = sizeof(_CMSimpleQueueData);
self->deleter = [] (void *data) {
delete reinterpret_cast<_CMSimpleQueueDataRef>(data);
};
self->ref = 1;
*queueOut = self;
return noErr;
}
inline OSStatus CMSimpleQueueEnqueue(CMSimpleQueueRef queue,
const void *element)
{
auto self = reinterpret_cast<_CMSimpleQueueDataRef>(queue->data);
if (self->items.size() == self->capacity)
return -1;
self->items.push(element);
return noErr;
}
inline const void *CMSimpleQueueDequeue(CMSimpleQueueRef queue)
{
auto self = reinterpret_cast<_CMSimpleQueueDataRef>(queue->data);
if (self->items.empty())
return nullptr;
auto element = self->items.front();
self->items.pop();
return element;
}
inline OSStatus CMSimpleQueueReset(CMSimpleQueueRef queue)
{
auto self = reinterpret_cast<_CMSimpleQueueDataRef>(queue->data);
while (!self->items.empty())
self->items.pop();
return noErr;
}
inline int32_t CMSimpleQueueGetCapacity(CMSimpleQueueRef queue)
{
return reinterpret_cast<_CMSimpleQueueDataRef>(queue->data)->capacity;
}
inline int32_t CMSimpleQueueGetCount(CMSimpleQueueRef queue)
{
return int32_t(reinterpret_cast<_CMSimpleQueueDataRef>(queue->data)->items.size());
}
inline Float32 CMSimpleQueueGetFullness(CMSimpleQueueRef queue)
{
auto self = reinterpret_cast<_CMSimpleQueueDataRef>(queue->data);
return Float32(self->items.size()) / self->capacity;
}
#endif // COREMEDIA_CMSIMPLEQUEUE_H