| /****************************************************************************** |
| * |
| * 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 <stdlib.h> |
| #include <string.h> |
| |
| #include <opus.h> |
| |
| /* 4 bytes: packet length, 4 bytes: encoder final range */ |
| constexpr int kSetupByteOffset = 8; |
| constexpr int kMaxFrameSample = 5760; |
| const int kSamplingRates[] = {8000, 12000, 16000, 24000, 48000}; |
| constexpr int kNumberSamplingRates = sizeof(kSamplingRates) / sizeof(kSamplingRates[0]); |
| |
| #ifdef MULTISTREAM |
| #include "opus_multistream.h" |
| #define OPUS_DEC_DATA_TYPE OpusMSDecoder |
| #define OPUS_DEC_DECODE_API opus_multistream_decode |
| #define OPUS_DEC_CREATE_API ms_opus_decoder_create |
| #define OPUS_DEC_DESTROY_API opus_multistream_decoder_destroy |
| static OpusMSDecoder *ms_opus_decoder_create(opus_int32 Fs, int channels, int *error) { |
| int streams = 1; |
| int coupledStreams = channels == 2; |
| unsigned char mapping[256] = {0, 1}; |
| return opus_multistream_decoder_create(Fs, channels, streams, coupledStreams, mapping, error); |
| } |
| #else |
| #define OPUS_DEC_DATA_TYPE OpusDecoder |
| #define OPUS_DEC_DECODE_API opus_decode |
| #define OPUS_DEC_CREATE_API opus_decoder_create |
| #define OPUS_DEC_DESTROY_API opus_decoder_destroy |
| #endif |
| |
| class Codec { |
| public: |
| Codec() = default; |
| ~Codec() { deInitDecoder(); } |
| bool initDecoder(const uint8_t *data); |
| void decodeFrames(const uint8_t *data, size_t size); |
| void deInitDecoder(); |
| |
| private: |
| int mSamplingRate; |
| int mNoOfChannels; |
| OPUS_DEC_DATA_TYPE *mDec = nullptr; |
| opus_int16 *mPcm = nullptr; |
| }; |
| |
| bool Codec::initDecoder(const uint8_t *data) { |
| const uint8_t *tocPtr = &data[kSetupByteOffset]; |
| const int bandwidth = opus_packet_get_bandwidth(tocPtr); |
| int samplingRateIndex = bandwidth - OPUS_BANDWIDTH_NARROWBAND; |
| |
| /*bounds check on samplingRateIndex*/ |
| if ((samplingRateIndex >= 0) && (samplingRateIndex < kNumberSamplingRates)) { |
| mSamplingRate = kSamplingRates[samplingRateIndex]; |
| } else { |
| mSamplingRate = 8000; // set to a default value |
| } |
| |
| mNoOfChannels = opus_packet_get_nb_channels(tocPtr); |
| if ((mNoOfChannels != 1) && (mNoOfChannels != 2)) { |
| mNoOfChannels = 1; |
| } |
| |
| int err; |
| mDec = OPUS_DEC_CREATE_API(mSamplingRate, mNoOfChannels, &err); |
| if (!mDec || err != OPUS_OK) { |
| return false; |
| } |
| size_t sizePcm = sizeof(*mPcm) * kMaxFrameSample * mNoOfChannels; |
| mPcm = static_cast<opus_int16 *>(malloc(sizePcm)); |
| if (!mPcm) { |
| return false; |
| } |
| memset(mPcm, 0x0, sizePcm); |
| return true; |
| } |
| |
| void Codec::deInitDecoder() { |
| OPUS_DEC_DESTROY_API(mDec); |
| mDec = nullptr; |
| if (mPcm) { |
| free(mPcm); |
| } |
| mPcm = nullptr; |
| } |
| |
| void Codec::decodeFrames(const uint8_t *data, size_t size) { |
| (void)OPUS_DEC_DECODE_API(mDec, data, size, mPcm, kMaxFrameSample, 0 /*fec*/); |
| } |
| |
| extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) { |
| if (size < kSetupByteOffset + 1) { |
| return 0; |
| } |
| Codec *codec = new Codec(); |
| if (!codec) { |
| return 0; |
| } |
| if (codec->initDecoder(data)) { |
| codec->decodeFrames(data, size); |
| } |
| delete codec; |
| return 0; |
| } |