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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 "webrtc/common_video/interface/i420_buffer_pool.h"
#include "webrtc/base/checks.h"
namespace {
// One extra indirection is needed to make |HasOneRef| work.
class PooledI420Buffer : public webrtc::VideoFrameBuffer {
public:
explicit PooledI420Buffer(
const rtc::scoped_refptr<webrtc::I420Buffer>& buffer)
: buffer_(buffer) {}
private:
~PooledI420Buffer() override {}
int width() const override { return buffer_->width(); }
int height() const override { return buffer_->height(); }
const uint8_t* data(webrtc::PlaneType type) const override {
return buffer_->data(type);
}
uint8_t* MutableData(webrtc::PlaneType type) override {
// Make the HasOneRef() check here instead of in |buffer_|, because the pool
// also has a reference to |buffer_|.
RTC_DCHECK(HasOneRef());
return const_cast<uint8_t*>(buffer_->data(type));
}
int stride(webrtc::PlaneType type) const override {
return buffer_->stride(type);
}
void* native_handle() const override { return nullptr; }
rtc::scoped_refptr<VideoFrameBuffer> NativeToI420Buffer() override {
RTC_NOTREACHED();
return nullptr;
}
friend class rtc::RefCountedObject<PooledI420Buffer>;
rtc::scoped_refptr<webrtc::I420Buffer> buffer_;
};
} // namespace
namespace webrtc {
I420BufferPool::I420BufferPool() {
Release();
}
void I420BufferPool::Release() {
thread_checker_.DetachFromThread();
buffers_.clear();
}
rtc::scoped_refptr<VideoFrameBuffer> I420BufferPool::CreateBuffer(int width,
int height) {
RTC_DCHECK(thread_checker_.CalledOnValidThread());
// 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<I420Buffer>& 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 a PooledI420Buffer returned from
// CreateBuffer that has not been released yet. If the ref count is 1
// (HasOneRef), then the list we are looping over holds the only reference
// and it's safe to reuse.
if (buffer->HasOneRef())
return new rtc::RefCountedObject<PooledI420Buffer>(buffer);
}
// Allocate new buffer.
buffers_.push_back(new rtc::RefCountedObject<I420Buffer>(width, height));
return new rtc::RefCountedObject<PooledI420Buffer>(buffers_.back());
}
} // namespace webrtc
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