Repo created

TMessagesProj/jni/voip/webrtc/rtc_base/buffer_queue.h

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+/*
+ *  Copyright 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 RTC_BASE_BUFFER_QUEUE_H_
+#define RTC_BASE_BUFFER_QUEUE_H_
+
+#include <stddef.h>
+
+#include <deque>
+#include <vector>
+
+#include "api/sequence_checker.h"
+#include "rtc_base/buffer.h"
+#include "rtc_base/system/no_unique_address.h"
+#include "rtc_base/thread_annotations.h"
+
+namespace rtc {
+
+class BufferQueue final {
+ public:
+  // Creates a buffer queue with a given capacity and default buffer size.
+  BufferQueue(size_t capacity, size_t default_size);
+  ~BufferQueue();
+
+  BufferQueue(const BufferQueue&) = delete;
+  BufferQueue& operator=(const BufferQueue&) = delete;
+
+  // Return number of queued buffers.
+  size_t size() const;
+
+  // Clear the BufferQueue by moving all Buffers from `queue_` to `free_list_`.
+  void Clear();
+
+  // ReadFront will only read one buffer at a time and will truncate buffers
+  // that don't fit in the passed memory.
+  // Returns true unless no data could be returned.
+  bool ReadFront(void* data, size_t bytes, size_t* bytes_read);
+
+  // WriteBack always writes either the complete memory or nothing.
+  // Returns true unless no data could be written.
+  bool WriteBack(const void* data, size_t bytes, size_t* bytes_written);
+
+  bool is_writable() const {
+    RTC_DCHECK_RUN_ON(&sequence_checker_);
+    return queue_.size() < capacity_;
+  }
+
+  bool is_readable() const {
+    RTC_DCHECK_RUN_ON(&sequence_checker_);
+    return !queue_.empty();
+  }
+
+ private:
+  RTC_NO_UNIQUE_ADDRESS webrtc::SequenceChecker sequence_checker_;
+  const size_t capacity_;
+  const size_t default_size_;
+  std::deque<Buffer*> queue_ RTC_GUARDED_BY(sequence_checker_);
+  std::vector<Buffer*> free_list_ RTC_GUARDED_BY(sequence_checker_);
+};
+
+}  // namespace rtc
+
+#endif  // RTC_BASE_BUFFER_QUEUE_H_