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/******************************************************************************
*
* 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;
}
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