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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.
#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 {
// Creates a buffer queue with a given capacity and default buffer size.
BufferQueue(size_t capacity, size_t default_size);
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 {
return queue_.size() < capacity_;
bool is_readable() const {
return !queue_.empty();
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