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/*
* Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "common_video/include/i420_buffer_pool.h"
#include <limits>
#include "rtc_base/checks.h"
namespace webrtc {
I420BufferPool::I420BufferPool() : I420BufferPool(false) {}
I420BufferPool::I420BufferPool(bool zero_initialize)
: I420BufferPool(zero_initialize, std::numeric_limits<size_t>::max()) {}
I420BufferPool::I420BufferPool(bool zero_initialize,
size_t max_number_of_buffers)
: zero_initialize_(zero_initialize),
max_number_of_buffers_(max_number_of_buffers) {}
I420BufferPool::~I420BufferPool() = default;
void I420BufferPool::Release() {
buffers_.clear();
}
rtc::scoped_refptr<I420Buffer> I420BufferPool::CreateBuffer(int width,
int height) {
RTC_DCHECK_RUNS_SERIALIZED(&race_checker_);
// Release buffers with wrong resolution.
for (auto it = buffers_.begin(); it != buffers_.end();) {
if ((*it)->width() != width || (*it)->height() != height)
it = buffers_.erase(it);
else
++it;
}
// Look for a free buffer.
for (const rtc::scoped_refptr<PooledI420Buffer>& buffer : buffers_) {
// If the buffer is in use, the ref count will be >= 2, one from the list we
// are looping over and one from the application. If the ref count is 1,
// then the list we are looping over holds the only reference and it's safe
// to reuse.
if (buffer->HasOneRef())
return buffer;
}
if (buffers_.size() >= max_number_of_buffers_)
return nullptr;
// Allocate new buffer.
rtc::scoped_refptr<PooledI420Buffer> buffer =
new PooledI420Buffer(width, height);
if (zero_initialize_)
buffer->InitializeData();
buffers_.push_back(buffer);
return buffer;
}
} // namespace webrtc
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