56 lines
2.2 KiB
C
56 lines
2.2 KiB
C
|
/*
|
||
|
|
* 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.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifndef WEBRTC_COMMON_VIDEO_INCLUDE_I420_BUFFER_POOL_H_
|
||
|
|
#define WEBRTC_COMMON_VIDEO_INCLUDE_I420_BUFFER_POOL_H_
|
||
|
|
|
||
|
|
#include <list>
|
||
|
|
|
||
|
|
#include "webrtc/base/thread_checker.h"
|
||
|
|
#include "webrtc/common_video/include/video_frame_buffer.h"
|
||
|
|
|
||
|
|
namespace webrtc {
|
||
|
|
|
||
|
|
// Simple buffer pool to avoid unnecessary allocations of I420Buffer objects.
|
||
|
|
// The pool manages the memory of the I420Buffer returned from CreateBuffer.
|
||
|
|
// When the I420Buffer is destructed, the memory is returned to the pool for use
|
||
|
|
// by subsequent calls to CreateBuffer. If the resolution passed to CreateBuffer
|
||
|
|
// changes, old buffers will be purged from the pool.
|
||
|
|
class I420BufferPool {
|
||
|
|
public:
|
||
|
|
I420BufferPool() : I420BufferPool(false) {}
|
||
|
|
explicit I420BufferPool(bool zero_initialize);
|
||
|
|
|
||
|
|
// Returns a buffer from the pool, or creates a new buffer if no suitable
|
||
|
|
// buffer exists in the pool.
|
||
|
|
rtc::scoped_refptr<I420Buffer> CreateBuffer(int width, int height);
|
||
|
|
// Clears buffers_ and detaches the thread checker so that it can be reused
|
||
|
|
// later from another thread.
|
||
|
|
void Release();
|
||
|
|
|
||
|
|
private:
|
||
|
|
// Explicitly use a RefCountedObject to get access to HasOneRef,
|
||
|
|
// needed by the pool to check exclusive access.
|
||
|
|
using PooledI420Buffer = rtc::RefCountedObject<I420Buffer>;
|
||
|
|
|
||
|
|
rtc::ThreadChecker thread_checker_;
|
||
|
|
std::list<rtc::scoped_refptr<PooledI420Buffer>> buffers_;
|
||
|
|
// If true, newly allocated buffers are zero-initialized. Note that recycled
|
||
|
|
// buffers are not zero'd before reuse. This is required of buffers used by
|
||
|
|
// FFmpeg according to http://crbug.com/390941, which only requires it for the
|
||
|
|
// initial allocation (as shown by FFmpeg's own buffer allocation code). It
|
||
|
|
// has to do with "Use-of-uninitialized-value" on "Linux_msan_chrome".
|
||
|
|
bool zero_initialize_;
|
||
|
|
};
|
||
|
|
|
||
|
|
} // namespace webrtc
|
||
|
|
|
||
|
|
#endif // WEBRTC_COMMON_VIDEO_INCLUDE_I420_BUFFER_POOL_H_
|