80 lines
3.2 KiB
C
80 lines
3.2 KiB
C
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/*
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* Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef COMMON_VIDEO_INCLUDE_I420_BUFFER_POOL_H_
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#define COMMON_VIDEO_INCLUDE_I420_BUFFER_POOL_H_
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#include <stddef.h>
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#include <list>
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#include "api/scoped_refptr.h"
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#include "api/video/i420_buffer.h"
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#include "rtc_base/race_checker.h"
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#include "rtc_base/ref_counted_object.h"
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namespace webrtc {
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// Simple buffer pool to avoid unnecessary allocations of I420Buffer objects.
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// The pool manages the memory of the I420Buffer returned from CreateBuffer.
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// When the I420Buffer is destructed, the memory is returned to the pool for use
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// by subsequent calls to CreateBuffer. If the resolution passed to CreateBuffer
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// changes, old buffers will be purged from the pool.
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// Note that CreateBuffer will crash if more than kMaxNumberOfFramesBeforeCrash
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// are created. This is to prevent memory leaks where frames are not returned.
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class I420BufferPool {
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public:
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I420BufferPool();
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explicit I420BufferPool(bool zero_initialize);
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I420BufferPool(bool zero_initialze, size_t max_number_of_buffers);
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~I420BufferPool();
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// Returns a buffer from the pool. If no suitable buffer exist in the pool
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// and there are less than |max_number_of_buffers| pending, a buffer is
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// created. Returns null otherwise.
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rtc::scoped_refptr<I420Buffer> CreateBuffer(int width, int height);
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// Returns a buffer from the pool with the explicitly specified stride.
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rtc::scoped_refptr<I420Buffer> CreateBuffer(int width,
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int height,
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int stride_y,
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int stride_u,
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int stride_v);
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// Changes the max amount of buffers in the pool to the new value.
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// Returns true if change was successful and false if the amount of already
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// allocated buffers is bigger than new value.
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bool Resize(size_t max_number_of_buffers);
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// Clears buffers_ and detaches the thread checker so that it can be reused
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// later from another thread.
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void Release();
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private:
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// Explicitly use a RefCountedObject to get access to HasOneRef,
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// needed by the pool to check exclusive access.
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using PooledI420Buffer = rtc::RefCountedObject<I420Buffer>;
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rtc::RaceChecker race_checker_;
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std::list<rtc::scoped_refptr<PooledI420Buffer>> buffers_;
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// If true, newly allocated buffers are zero-initialized. Note that recycled
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// buffers are not zero'd before reuse. This is required of buffers used by
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// FFmpeg according to http://crbug.com/390941, which only requires it for the
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// initial allocation (as shown by FFmpeg's own buffer allocation code). It
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// has to do with "Use-of-uninitialized-value" on "Linux_msan_chrome".
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const bool zero_initialize_;
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// Max number of buffers this pool can have pending.
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size_t max_number_of_buffers_;
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};
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} // namespace webrtc
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#endif // COMMON_VIDEO_INCLUDE_I420_BUFFER_POOL_H_
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