1 /* 2 * Copyright 2015 The WebRTC Project Authors. All rights reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 #ifndef WEBRTC_BASE_BUFFERQUEUE_H_ 12 #define WEBRTC_BASE_BUFFERQUEUE_H_ 13 14 #include <deque> 15 #include <vector> 16 17 #include "webrtc/base/buffer.h" 18 #include "webrtc/base/criticalsection.h" 19 20 namespace rtc { 21 22 class BufferQueue { 23 public: 24 // Creates a buffer queue with a given capacity and default buffer size. 25 BufferQueue(size_t capacity, size_t default_size); 26 virtual ~BufferQueue(); 27 28 // Return number of queued buffers. 29 size_t size() const; 30 31 // ReadFront will only read one buffer at a time and will truncate buffers 32 // that don't fit in the passed memory. 33 // Returns true unless no data could be returned. 34 bool ReadFront(void* data, size_t bytes, size_t* bytes_read); 35 36 // WriteBack always writes either the complete memory or nothing. 37 // Returns true unless no data could be written. 38 bool WriteBack(const void* data, size_t bytes, size_t* bytes_written); 39 40 protected: 41 // These methods are called when the state of the queue changes. 42 virtual void NotifyReadableForTest() {} 43 virtual void NotifyWritableForTest() {} 44 45 private: 46 size_t capacity_; 47 size_t default_size_; 48 mutable CriticalSection crit_; 49 std::deque<Buffer*> queue_ GUARDED_BY(crit_); 50 std::vector<Buffer*> free_list_ GUARDED_BY(crit_); 51 52 RTC_DISALLOW_COPY_AND_ASSIGN(BufferQueue); 53 }; 54 55 } // namespace rtc 56 57 #endif // WEBRTC_BASE_BUFFERQUEUE_H_ 58
