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// Copyright (c) 2012 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/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
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