Anuj Joshi | caf21aa | 2020-03-31 10:53:52 +0530 | [diff] [blame] | 1 | /****************************************************************************** |
| 2 | * |
| 3 | * Copyright (C) 2020 The Android Open Source Project |
| 4 | * |
| 5 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 6 | * you may not use this file except in compliance with the License. |
| 7 | * You may obtain a copy of the License at: |
| 8 | * |
| 9 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 10 | * |
| 11 | * Unless required by applicable law or agreed to in writing, software |
| 12 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 13 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 14 | * See the License for the specific language governing permissions and |
| 15 | * limitations under the License. |
| 16 | * |
| 17 | ***************************************************************************** |
| 18 | * Originally developed and contributed by Ittiam Systems Pvt. Ltd, Bangalore |
| 19 | */ |
| 20 | |
| 21 | #include <stdint.h> |
| 22 | #include <stdlib.h> |
| 23 | #include <string.h> |
| 24 | |
| 25 | #include <opus.h> |
| 26 | |
| 27 | /* 4 bytes: packet length, 4 bytes: encoder final range */ |
| 28 | constexpr int kSetupByteOffset = 8; |
| 29 | constexpr int kMaxFrameSample = 5760; |
| 30 | const int kSamplingRates[] = {8000, 12000, 16000, 24000, 48000}; |
| 31 | constexpr int kNumberSamplingRates = sizeof(kSamplingRates) / sizeof(kSamplingRates[0]); |
| 32 | |
| 33 | #ifdef MULTISTREAM |
| 34 | #include "opus_multistream.h" |
| 35 | #define OPUS_DEC_DATA_TYPE OpusMSDecoder |
| 36 | #define OPUS_DEC_DECODE_API opus_multistream_decode |
| 37 | #define OPUS_DEC_CREATE_API ms_opus_decoder_create |
| 38 | #define OPUS_DEC_DESTROY_API opus_multistream_decoder_destroy |
| 39 | static OpusMSDecoder *ms_opus_decoder_create(opus_int32 Fs, int channels, int *error) { |
| 40 | int streams = 1; |
| 41 | int coupledStreams = channels == 2; |
| 42 | unsigned char mapping[256] = {0, 1}; |
| 43 | return opus_multistream_decoder_create(Fs, channels, streams, coupledStreams, mapping, error); |
| 44 | } |
| 45 | #else |
| 46 | #define OPUS_DEC_DATA_TYPE OpusDecoder |
| 47 | #define OPUS_DEC_DECODE_API opus_decode |
| 48 | #define OPUS_DEC_CREATE_API opus_decoder_create |
| 49 | #define OPUS_DEC_DESTROY_API opus_decoder_destroy |
| 50 | #endif |
| 51 | |
| 52 | class Codec { |
| 53 | public: |
| 54 | Codec() = default; |
| 55 | ~Codec() { deInitDecoder(); } |
| 56 | bool initDecoder(const uint8_t *data); |
| 57 | void decodeFrames(const uint8_t *data, size_t size); |
| 58 | void deInitDecoder(); |
| 59 | |
| 60 | private: |
| 61 | int mSamplingRate; |
| 62 | int mNoOfChannels; |
| 63 | OPUS_DEC_DATA_TYPE *mDec = nullptr; |
| 64 | opus_int16 *mPcm = nullptr; |
| 65 | }; |
| 66 | |
| 67 | bool Codec::initDecoder(const uint8_t *data) { |
| 68 | const uint8_t *tocPtr = &data[kSetupByteOffset]; |
| 69 | const int bandwidth = opus_packet_get_bandwidth(tocPtr); |
| 70 | int samplingRateIndex = bandwidth - OPUS_BANDWIDTH_NARROWBAND; |
| 71 | |
| 72 | /*bounds check on samplingRateIndex*/ |
| 73 | if ((samplingRateIndex >= 0) && (samplingRateIndex < kNumberSamplingRates)) { |
| 74 | mSamplingRate = kSamplingRates[samplingRateIndex]; |
| 75 | } else { |
| 76 | mSamplingRate = 8000; // set to a default value |
| 77 | } |
| 78 | |
| 79 | mNoOfChannels = opus_packet_get_nb_channels(tocPtr); |
| 80 | if ((mNoOfChannels != 1) && (mNoOfChannels != 2)) { |
| 81 | mNoOfChannels = 1; |
| 82 | } |
| 83 | |
| 84 | int err; |
| 85 | mDec = OPUS_DEC_CREATE_API(mSamplingRate, mNoOfChannels, &err); |
| 86 | if (!mDec || err != OPUS_OK) { |
| 87 | return false; |
| 88 | } |
| 89 | size_t sizePcm = sizeof(*mPcm) * kMaxFrameSample * mNoOfChannels; |
| 90 | mPcm = static_cast<opus_int16 *>(malloc(sizePcm)); |
| 91 | if (!mPcm) { |
| 92 | return false; |
| 93 | } |
| 94 | memset(mPcm, 0x0, sizePcm); |
| 95 | return true; |
| 96 | } |
| 97 | |
| 98 | void Codec::deInitDecoder() { |
| 99 | OPUS_DEC_DESTROY_API(mDec); |
| 100 | mDec = nullptr; |
| 101 | if (mPcm) { |
| 102 | free(mPcm); |
| 103 | } |
| 104 | mPcm = nullptr; |
| 105 | } |
| 106 | |
| 107 | void Codec::decodeFrames(const uint8_t *data, size_t size) { |
| 108 | (void)OPUS_DEC_DECODE_API(mDec, data, size, mPcm, kMaxFrameSample, 0 /*fec*/); |
| 109 | } |
| 110 | |
| 111 | extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) { |
| 112 | if (size < kSetupByteOffset + 1) { |
| 113 | return 0; |
| 114 | } |
| 115 | Codec *codec = new Codec(); |
| 116 | if (!codec) { |
| 117 | return 0; |
| 118 | } |
| 119 | if (codec->initDecoder(data)) { |
| 120 | codec->decodeFrames(data, size); |
| 121 | } |
| 122 | delete codec; |
| 123 | return 0; |
| 124 | } |