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// Copyright (c) 2014 The WebM 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 <CoreVideo/CoreVideo.h>
#include "./vpx_example_common.h"
namespace VpxExample {
// Creates and manages a buffer pool containing kNumVideoBuffers VideoBuffers.
class VideoBufferPool {
struct VideoBuffer {
VideoBuffer() : buffer(NULL), in_use(false), slot(0) {}
CVPixelBufferRef buffer;
bool in_use;
size_t slot;
VideoBufferPool() : lock_(NULL) {}
// Allocates buffers stored in |buffer_pool_|. Returns true when successful.
bool Init(size_t width, size_t height);
// Finds an unused buffer in |buffer_pool_| and returns it. Returns NULL when
// all buffers are in use.
// This call blocks until |lock_| is obtained.
const VideoBuffer *GetBuffer();
// Releases |buffer| and returns it to the pool.
// This call blocks until |lock_| is obtained.
void ReleaseBuffer(const VideoBuffer *buffer);
NSLock *lock_;
VideoBuffer buffer_pool_[kNumVideoBuffers];
} // namespace VpxExample