1 files changed, 84 insertions, 0 deletions
diff --git a/third_party/libwebrtc/common_video/include/video_frame_buffer_pool.h b/third_party/libwebrtc/common_video/include/video_frame_buffer_pool.h
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+++ b/third_party/libwebrtc/common_video/include/video_frame_buffer_pool.h
@@ -0,0 +1,84 @@
+/*
+ *  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 COMMON_VIDEO_INCLUDE_VIDEO_FRAME_BUFFER_POOL_H_
+#define COMMON_VIDEO_INCLUDE_VIDEO_FRAME_BUFFER_POOL_H_
+
+#include <stddef.h>
+
+#include <list>
+
+#include "api/scoped_refptr.h"
+#include "api/video/i010_buffer.h"
+#include "api/video/i210_buffer.h"
+#include "api/video/i410_buffer.h"
+#include "api/video/i420_buffer.h"
+#include "api/video/i422_buffer.h"
+#include "api/video/i444_buffer.h"
+#include "api/video/nv12_buffer.h"
+#include "rtc_base/race_checker.h"
+
+namespace webrtc {
+
+// Simple buffer pool to avoid unnecessary allocations of video frame buffers.
+// The pool manages the memory of the I420Buffer/NV12Buffer returned from
+// Create(I420|NV12)Buffer. When the buffer is destructed, the memory is
+// returned to the pool for use by subsequent calls to Create(I420|NV12)Buffer.
+// If the resolution passed to Create(I420|NV12)Buffer changes or requested
+// pixel format changes, old buffers will be purged from the pool.
+// Note that Create(I420|NV12)Buffer will crash if more than
+// kMaxNumberOfFramesBeforeCrash are created. This is to prevent memory leaks
+// where frames are not returned.
+class VideoFrameBufferPool {
+ public:
+  VideoFrameBufferPool();
+  explicit VideoFrameBufferPool(bool zero_initialize);
+  VideoFrameBufferPool(bool zero_initialize, size_t max_number_of_buffers);
+  ~VideoFrameBufferPool();
+
+  // Returns a buffer from the pool. If no suitable buffer exist in the pool
+  // and there are less than `max_number_of_buffers` pending, a buffer is
+  // created. Returns null otherwise.
+  rtc::scoped_refptr<I420Buffer> CreateI420Buffer(int width, int height);
+  rtc::scoped_refptr<I422Buffer> CreateI422Buffer(int width, int height);
+  rtc::scoped_refptr<I444Buffer> CreateI444Buffer(int width, int height);
+  rtc::scoped_refptr<I010Buffer> CreateI010Buffer(int width, int height);
+  rtc::scoped_refptr<I210Buffer> CreateI210Buffer(int width, int height);
+  rtc::scoped_refptr<I410Buffer> CreateI410Buffer(int width, int height);
+  rtc::scoped_refptr<NV12Buffer> CreateNV12Buffer(int width, int height);
+
+  // Changes the max amount of buffers in the pool to the new value.
+  // Returns true if change was successful and false if the amount of already
+  // allocated buffers is bigger than new value.
+  bool Resize(size_t max_number_of_buffers);
+
+  // Clears buffers_ and detaches the thread checker so that it can be reused
+  // later from another thread.
+  void Release();
+
+ private:
+  rtc::scoped_refptr<VideoFrameBuffer>
+  GetExistingBuffer(int width, int height, VideoFrameBuffer::Type type);
+
+  rtc::RaceChecker race_checker_;
+  std::list<rtc::scoped_refptr<VideoFrameBuffer>> 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".
+  const bool zero_initialize_;
+  // Max number of buffers this pool can have pending.
+  size_t max_number_of_buffers_;
+};
+
+}  // namespace webrtc
+
+#endif  // COMMON_VIDEO_INCLUDE_VIDEO_FRAME_BUFFER_POOL_H_