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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 "rtc_base/buffer_queue.h"
#include <algorithm>
#include <cstdint>
#include <cstring>
#include "api/sequence_checker.h"
#include "rtc_base/buffer.h"
namespace webrtc {
BufferQueue::BufferQueue(size_t capacity, size_t default_size)
: capacity_(capacity), default_size_(default_size) {}
BufferQueue::~BufferQueue() {
RTC_DCHECK_RUN_ON(&sequence_checker_);
for (Buffer* buffer : queue_)
delete buffer;
for (Buffer* buffer : free_list_)
delete buffer;
}
size_t BufferQueue::size() const {
RTC_DCHECK_RUN_ON(&sequence_checker_);
return queue_.size();
}
void BufferQueue::Clear() {
RTC_DCHECK_RUN_ON(&sequence_checker_);
while (!queue_.empty()) {
free_list_.push_back(queue_.front());
queue_.pop_front();
}
}
bool BufferQueue::ReadFront(void* buffer, size_t bytes, size_t* bytes_read) {
RTC_DCHECK_RUN_ON(&sequence_checker_);
if (queue_.empty())
return false;
Buffer* packet = queue_.front();
queue_.pop_front();
bytes = std::min(bytes, packet->size());
memcpy(buffer, packet->data(), bytes);
if (bytes_read)
*bytes_read = bytes;
free_list_.push_back(packet);
return true;
}
bool BufferQueue::WriteBack(const void* buffer,
size_t bytes,
size_t* bytes_written) {
RTC_DCHECK_RUN_ON(&sequence_checker_);
if (queue_.size() == capacity_)
return false;
Buffer* packet;
if (!free_list_.empty()) {
packet = free_list_.back();
free_list_.pop_back();
} else {
packet = new Buffer(bytes, default_size_);
}
packet->SetData(static_cast<const uint8_t*>(buffer), bytes);
if (bytes_written)
*bytes_written = bytes;
queue_.push_back(packet);
return true;
}
} // namespace webrtc
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