| /****************************************************************************** |
| * |
| * 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 <string.h> |
| #include <utils/Log.h> |
| #include <algorithm> |
| #include "gsmamr_enc.h" |
| |
| // Constants for AMR-NB |
| const int32_t kNumInputSamples = L_FRAME; // 160 samples |
| const int32_t kOutputBufferSize = 2 * kNumInputSamples * sizeof(Word16); |
| const Mode kModes[9] = {MR475, /* 4.75 kbps */ |
| MR515, /* 5.15 kbps */ |
| MR59, /* 5.90 kbps */ |
| MR67, /* 6.70 kbps */ |
| MR74, /* 7.40 kbps */ |
| MR795, /* 7.95 kbps */ |
| MR102, /* 10.2 kbps */ |
| MR122, /* 12.2 kbps */ |
| MRDTX, /* DTX */}; |
| const Word16 kOutputFormat[3] = {AMR_TX_WMF, AMR_TX_IF2, AMR_TX_ETS}; |
| |
| class Codec { |
| public: |
| Codec() = default; |
| ~Codec() { deInitEncoder(); } |
| Word16 initEncoder(const uint8_t *data); |
| void deInitEncoder(); |
| void encodeFrames(const uint8_t *data, size_t size); |
| |
| private: |
| void *mEncState = nullptr; |
| void *mSidState = nullptr; |
| }; |
| |
| Word16 Codec::initEncoder(const uint8_t *data) { |
| return AMREncodeInit(&mEncState, &mSidState, (*data >> 1) & 0x01 /* dtx_enable flag */); |
| } |
| |
| void Codec::deInitEncoder() { |
| if (mEncState) { |
| AMREncodeExit(&mEncState, &mSidState); |
| mEncState = nullptr; |
| mSidState = nullptr; |
| } |
| } |
| |
| void Codec::encodeFrames(const uint8_t *data, size_t size) { |
| AMREncodeReset(mEncState, mSidState); |
| uint8_t startByte = *data; |
| int modeIndex = ((startByte >> 3) % 9); |
| int outputFormatIndex = (startByte % 3); |
| Mode mode = kModes[modeIndex]; |
| Word16 outputFormat = kOutputFormat[outputFormatIndex]; |
| |
| // Consume startByte |
| data++; |
| size--; |
| |
| while (size > 0) { |
| Frame_Type_3GPP frameType = (Frame_Type_3GPP)mode; |
| |
| Word16 inputBuf[kNumInputSamples] = {}; |
| int32_t minSize = std::min(size, sizeof(inputBuf)); |
| |
| uint8_t outputBuf[kOutputBufferSize] = {}; |
| memcpy(inputBuf, data, minSize); |
| |
| AMREncode(mEncState, mSidState, mode, inputBuf, outputBuf, &frameType, outputFormat); |
| |
| data += minSize; |
| size -= minSize; |
| } |
| } |
| |
| extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) { |
| if (size < 1) { |
| return 0; |
| } |
| Codec *codec = new Codec(); |
| if (!codec) { |
| return 0; |
| } |
| if (codec->initEncoder(data) == 0) { |
| codec->encodeFrames(data, size); |
| } |
| delete codec; |
| return 0; |
| } |