| /****************************************************************************** |
| * |
| * Copyright (C) 2020 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at: |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| * |
| ***************************************************************************** |
| * Originally developed and contributed by Ittiam Systems Pvt. Ltd, Bangalore |
| */ |
| |
| #include <stdint.h> |
| #include <string.h> |
| #include <algorithm> |
| #include "aacdecoder_lib.h" |
| |
| constexpr uint8_t kNumberOfLayers = 1; |
| constexpr uint8_t kMaxChannelCount = 8; |
| constexpr uint32_t kMaxConfigurationSize = 1024; |
| constexpr uint32_t kMaxOutBufferSize = 2048 * kMaxChannelCount; |
| |
| // Value indicating the start of AAC Header Segment |
| constexpr const char *kAacSegStartSeq = "AAC_STRT"; |
| constexpr uint8_t kAacSegStartSeqLen = sizeof(kAacSegStartSeq); |
| // Value indicating the end of AAC Header Segment |
| constexpr const char *kAacSegEndSeq = "AAC_ENDS"; |
| constexpr uint8_t kAacSegEndSeqLen = sizeof(kAacSegEndSeq); |
| |
| // Number of bytes used to signal the length of the header |
| constexpr uint8_t kHeaderLengthBytes = 2; |
| // Minimum size of an AAC header is 2 |
| // Minimum data required is |
| // strlen(AAC_STRT) + strlen(AAC_ENDS) + kHeaderLengthBytes + 2; |
| constexpr UINT kMinDataSize = kAacSegStartSeqLen + kAacSegEndSeqLen + kHeaderLengthBytes + 2; |
| |
| UINT getHeaderSize(UCHAR *data, UINT size) { |
| if (size < kMinDataSize) { |
| return 0; |
| } |
| |
| int32_t result = memcmp(data, kAacSegStartSeq, kAacSegStartSeqLen); |
| if (result) { |
| return 0; |
| } |
| data += kAacSegStartSeqLen; |
| size -= kAacSegStartSeqLen; |
| |
| uint32_t headerLengthInBytes = (data[0] << 8 | data[1]) & 0xFFFF; |
| data += kHeaderLengthBytes; |
| size -= kHeaderLengthBytes; |
| |
| if (headerLengthInBytes + kAacSegEndSeqLen > size) { |
| return 0; |
| } |
| |
| data += headerLengthInBytes; |
| size -= headerLengthInBytes; |
| result = memcmp(data, kAacSegEndSeq, kAacSegEndSeqLen); |
| if (result) { |
| return 0; |
| } |
| |
| return std::min(headerLengthInBytes, kMaxConfigurationSize); |
| } |
| |
| class Codec { |
| public: |
| Codec() = default; |
| ~Codec() { deInitDecoder(); } |
| bool initDecoder(); |
| void decodeFrames(UCHAR *data, UINT size); |
| void deInitDecoder(); |
| |
| private: |
| HANDLE_AACDECODER mAacDecoderHandle = nullptr; |
| AAC_DECODER_ERROR mErrorCode = AAC_DEC_OK; |
| }; |
| |
| bool Codec::initDecoder() { |
| mAacDecoderHandle = aacDecoder_Open(TT_MP4_ADIF, kNumberOfLayers); |
| if (!mAacDecoderHandle) { |
| return false; |
| } |
| return true; |
| } |
| |
| void Codec::deInitDecoder() { |
| aacDecoder_Close(mAacDecoderHandle); |
| mAacDecoderHandle = nullptr; |
| } |
| |
| void Codec::decodeFrames(UCHAR *data, UINT size) { |
| UINT headerSize = getHeaderSize(data, size); |
| if (headerSize != 0) { |
| data += kAacSegStartSeqLen + kHeaderLengthBytes; |
| size -= kAacSegStartSeqLen + kHeaderLengthBytes; |
| aacDecoder_ConfigRaw(mAacDecoderHandle, &data, &headerSize); |
| data += headerSize + kAacSegEndSeqLen; |
| size -= headerSize + kAacSegEndSeqLen; |
| } |
| while (size > 0) { |
| UINT inputSize = size; |
| UINT valid = size; |
| mErrorCode = aacDecoder_Fill(mAacDecoderHandle, &data, &inputSize, &valid); |
| if (mErrorCode != AAC_DEC_OK) { |
| ++data; |
| --size; |
| } else { |
| INT_PCM outputBuf[kMaxOutBufferSize]; |
| do { |
| mErrorCode = |
| aacDecoder_DecodeFrame(mAacDecoderHandle, outputBuf, sizeof(outputBuf), 0); |
| } while (mErrorCode == AAC_DEC_OK); |
| UINT offset = inputSize - valid; |
| data += offset; |
| size = valid; |
| } |
| } |
| } |
| |
| extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) { |
| Codec *codec = new Codec(); |
| if (!codec) { |
| return 0; |
| } |
| if (codec->initDecoder()) { |
| codec->decodeFrames((UCHAR *)(data), static_cast<UINT>(size)); |
| } |
| delete codec; |
| return 0; |
| } |