Move offset_byte_queue.* from media/mp4 to media/common.

media/formats/mp4/offset_byte_queue.cc

-// Copyright 2014 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "media/formats/mp4/offset_byte_queue.h"
-
-#include "base/basictypes.h"
-#include "base/logging.h"
-
-namespace media {
-
-OffsetByteQueue::OffsetByteQueue() : buf_(NULL), size_(0), head_(0) {}
-OffsetByteQueue::~OffsetByteQueue() {}
-
-void OffsetByteQueue::Reset() {
-  queue_.Reset();
-  buf_ = NULL;
-  size_ = 0;
-  head_ = 0;
-}
-
-void OffsetByteQueue::Push(const uint8* buf, int size) {
-  queue_.Push(buf, size);
-  Sync();
-  DVLOG(4) << "Buffer pushed. head=" << head() << " tail=" << tail();
-}
-
-void OffsetByteQueue::Peek(const uint8** buf, int* size) {
-  *buf = size_ > 0 ? buf_ : NULL;
-  *size = size_;
-}
-
-void OffsetByteQueue::Pop(int count) {
-  queue_.Pop(count);
-  head_ += count;
-  Sync();
-}
-
-void OffsetByteQueue::PeekAt(int64 offset, const uint8** buf, int* size) {
-  DCHECK(offset >= head());
-  if (offset < head() || offset >= tail()) {
-    *buf = NULL;
-    *size = 0;
-    return;
-  }
-  *buf = &buf_[offset - head()];
-  *size = tail() - offset;
-}
-
-bool OffsetByteQueue::Trim(int64 max_offset) {
-  if (max_offset < head_) return true;
-  if (max_offset > tail()) {
-    Pop(size_);
-    return false;
-  }
-  Pop(max_offset - head_);
-  return true;
-}
-
-void OffsetByteQueue::Sync() {
-  queue_.Peek(&buf_, &size_);
-}
-
-}  // namespace media