1 /*
2 * Copyright (C) 2011 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include <decode_buffer.h>
18
19 namespace {
20
21 static const size_t kNumberOfBytesPerSample = 2;
22
23 } // namespace
24
DecodeBuffer(size_t sizeOfOneBuffer,size_t maxSize)25 DecodeBuffer::DecodeBuffer(size_t sizeOfOneBuffer, size_t maxSize)
26 : sizeOfOneBuffer_(sizeOfOneBuffer), maxSize_(maxSize),
27 start_(0), end_(0), advancedCount_(0), data_() {
28 Clear();
29 }
30
~DecodeBuffer()31 DecodeBuffer::~DecodeBuffer() {
32 Clear();
33 }
34
GetSizeInBytes() const35 size_t DecodeBuffer::GetSizeInBytes() const {
36 return kNumberOfBytesPerSample * (end_ - start_);
37 }
38
IsTooLarge() const39 bool DecodeBuffer::IsTooLarge() const {
40 return GetSizeInBytes() > maxSize_;
41 }
42
AddData(int8_t * pointer,size_t lengthInBytes)43 void DecodeBuffer::AddData(int8_t* pointer, size_t lengthInBytes) {
44 for (size_t i = 0; i < lengthInBytes / kNumberOfBytesPerSample; ++i) {
45 PushValue(reinterpret_cast<int16*>(pointer)[i]);
46 }
47 }
48
Clear()49 void DecodeBuffer::Clear() {
50 while (data_.size() > 0) {
51 delete[] data_.front();
52 data_.erase(data_.begin());
53 }
54 start_ = 0;
55 end_ = 0;
56 advancedCount_ = 0;
57 }
58
GetTotalAdvancedCount() const59 size_t DecodeBuffer::GetTotalAdvancedCount() const {
60 return advancedCount_;
61 }
62
AdvanceHeadPointerShorts(size_t numberOfShorts)63 void DecodeBuffer::AdvanceHeadPointerShorts(size_t numberOfShorts) {
64 start_ += numberOfShorts;
65 while (start_ > sizeOfOneBuffer_) {
66 data_.push_back(data_.front());
67 data_.erase(data_.begin());
68 start_ -= sizeOfOneBuffer_;
69 end_ -= sizeOfOneBuffer_;
70 }
71 advancedCount_ += numberOfShorts;
72 }
73
PushValue(int16 value)74 void DecodeBuffer::PushValue(int16 value) {
75 size_t bufferIndex = end_ / sizeOfOneBuffer_;
76 if (bufferIndex >= data_.size()) {
77 data_.push_back(new int16[sizeOfOneBuffer_]);
78 }
79 data_.at(bufferIndex)[end_ % sizeOfOneBuffer_] = value;
80 ++end_;
81 }
82
GetAtIndex(size_t index)83 int16 DecodeBuffer::GetAtIndex(size_t index) {
84 return data_.at((start_ + index) / sizeOfOneBuffer_)
85 [(start_ + index) % sizeOfOneBuffer_];
86 }
87