15d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles)// Copyright 2014 The Chromium Authors. All rights reserved. 25821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Use of this source code is governed by a BSD-style license that can be 35821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// found in the LICENSE file. 45821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 55d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles)#include "media/formats/common/offset_byte_queue.h" 65821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 75821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/basictypes.h" 85821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/logging.h" 95821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)namespace media { 115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)OffsetByteQueue::OffsetByteQueue() : buf_(NULL), size_(0), head_(0) {} 135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)OffsetByteQueue::~OffsetByteQueue() {} 145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void OffsetByteQueue::Reset() { 165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) queue_.Reset(); 175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) buf_ = NULL; 185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) size_ = 0; 195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) head_ = 0; 205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void OffsetByteQueue::Push(const uint8* buf, int size) { 235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) queue_.Push(buf, size); 245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) Sync(); 255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DVLOG(4) << "Buffer pushed. head=" << head() << " tail=" << tail(); 265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void OffsetByteQueue::Peek(const uint8** buf, int* size) { 295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) *buf = size_ > 0 ? buf_ : NULL; 305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) *size = size_; 315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void OffsetByteQueue::Pop(int count) { 345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) queue_.Pop(count); 355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) head_ += count; 365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) Sync(); 375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void OffsetByteQueue::PeekAt(int64 offset, const uint8** buf, int* size) { 405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK(offset >= head()); 415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (offset < head() || offset >= tail()) { 425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) *buf = NULL; 435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) *size = 0; 445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return; 455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) *buf = &buf_[offset - head()]; 475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) *size = tail() - offset; 485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)bool OffsetByteQueue::Trim(int64 max_offset) { 515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (max_offset < head_) return true; 525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (max_offset > tail()) { 535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) Pop(size_); 545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return false; 555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) Pop(max_offset - head_); 575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return true; 585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void OffsetByteQueue::Sync() { 615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) queue_.Peek(&buf_, &size_); 625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} // namespace media 65