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