Anuj Joshi | 3ff86be | 2020-11-11 10:46:00 +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 <math.h> |
| 22 | #include <stdlib.h> |
| 23 | #include <algorithm> |
| 24 | |
| 25 | #include "FLAC/stream_encoder.h" |
| 26 | #include "audio_utils/primitives.h" |
| 27 | #include "share/compat.h" |
| 28 | |
| 29 | constexpr int kMinSampleRate = 1; |
| 30 | constexpr int kFramesPerBlock = 1152; |
| 31 | constexpr int kMaxSampleRate = 655350; |
| 32 | constexpr uint8_t kMinNumChannels = 1; |
| 33 | constexpr uint8_t kMaxNumChannels = 2; |
| 34 | constexpr uint8_t kMinCompressionLevel = 0; |
| 35 | constexpr uint8_t kMaxCompressionLevel = 8; |
| 36 | |
| 37 | enum Encoding { PCM_16, PCM_FLOAT }; |
| 38 | |
| 39 | enum { |
| 40 | IDX_SAMPLE_RATE_INDEX_1 = 0, |
| 41 | IDX_SAMPLE_RATE_INDEX_2, |
| 42 | IDX_SAMPLE_RATE_INDEX_3, |
| 43 | IDX_CHANNEL, |
| 44 | IDX_COMPRESSION_LEVEL, |
| 45 | IDX_PCM, |
| 46 | IDX_SET_VERIFY, |
| 47 | IDX_SET_STREAMABLE_SUBSET, |
| 48 | IDX_SET_DO_MID_SIDE_STEREO, |
| 49 | IDX_SET_LOOSE_MID_SIDE_STEREO, |
| 50 | IDX_SET_MAX_LPC_ORDER, |
| 51 | IDX_SET_COEFF_PRECISION, |
| 52 | IDX_SET_COEFF_PREC_SEARCH, |
| 53 | IDX_SET_DO_ESCAPE_CODING, |
| 54 | IDX_SET_DO_EXHAUSTIVE_MODEL_SEARCH, |
| 55 | IDX_SET_MIN_RESIDUAL_PARTITION_ORDER, |
| 56 | IDX_SET_MAX_RESIDUAL_PARTITION_ORDER, |
| 57 | IDX_SET_RICE_PARAMETER_SEARCH_DIST, |
| 58 | IDX_SET_TOTAL_SAMPLES_ESTIMATE, |
| 59 | IDX_LAST |
| 60 | }; |
| 61 | |
| 62 | class Codec { |
| 63 | public: |
| 64 | ~Codec() { deInitEncoder(); } |
| 65 | bool initEncoder(uint8_t **dataPtr, size_t *sizePtr); |
| 66 | void encodeFrames(const uint8_t *data, size_t size); |
| 67 | void deInitEncoder(); |
| 68 | static FLAC__StreamEncoderWriteStatus flacEncoderWriteCallback( |
| 69 | const FLAC__StreamEncoder *encoder, const FLAC__byte buffer[], size_t bytes, |
| 70 | unsigned samples, unsigned current_frame, void *client_data); |
| 71 | |
| 72 | private: |
| 73 | bool verifyStateAndReturn(); |
| 74 | FLAC__StreamEncoder *mFlacStreamEncoder = nullptr; |
| 75 | uint32_t mChannels = 0; |
| 76 | uint32_t mPcmEncodingInfo = 0; |
| 77 | FLAC__int32 mInputBufferPcm32[kFramesPerBlock * kMaxNumChannels] = {}; |
| 78 | }; |
| 79 | |
| 80 | FLAC__StreamEncoderWriteStatus Codec::flacEncoderWriteCallback(const FLAC__StreamEncoder *encoder, |
| 81 | const FLAC__byte buffer[], |
| 82 | size_t bytes, unsigned samples, |
| 83 | unsigned current_frame, |
| 84 | void *client_data) { |
| 85 | (void)encoder; |
| 86 | (void)buffer; |
| 87 | (void)bytes; |
| 88 | (void)samples; |
| 89 | (void)current_frame; |
| 90 | (void)client_data; |
| 91 | return FLAC__STREAM_ENCODER_WRITE_STATUS_OK; |
| 92 | } |
| 93 | |
| 94 | bool Codec::verifyStateAndReturn() { |
| 95 | FLAC__StreamEncoderState state = FLAC__stream_encoder_get_state(mFlacStreamEncoder); |
| 96 | if (state == FLAC__STREAM_ENCODER_VERIFY_DECODER_ERROR) { |
| 97 | FLAC__stream_encoder_get_verify_decoder_state(mFlacStreamEncoder); |
| 98 | } |
| 99 | return false; |
| 100 | } |
| 101 | |
| 102 | template <typename type1, typename type2, typename type3> |
| 103 | auto generateNumberInRangeFromData(type1 data, type2 min, type3 max) -> decltype(max) { |
| 104 | return (data % (1 + max - min)) + min; |
| 105 | } |
| 106 | |
| 107 | bool Codec::initEncoder(uint8_t **dataPtr, size_t *sizePtr) { |
| 108 | uint8_t *data = *dataPtr; |
| 109 | mFlacStreamEncoder = FLAC__stream_encoder_new(); |
| 110 | if (!mFlacStreamEncoder) { |
| 111 | return false; |
| 112 | } |
| 113 | |
| 114 | // Clubbing 3 bytes of data to ensure sample rate in the range [1, 655350] |
| 115 | uint32_t tempValue = (data[IDX_SAMPLE_RATE_INDEX_1] << 16) | |
| 116 | (data[IDX_SAMPLE_RATE_INDEX_2] << 8) | data[IDX_SAMPLE_RATE_INDEX_3]; |
| 117 | uint32_t sampleRate = generateNumberInRangeFromData(tempValue, kMinSampleRate, kMaxSampleRate); |
| 118 | FLAC__stream_encoder_set_sample_rate(mFlacStreamEncoder, sampleRate); |
| 119 | |
| 120 | mChannels = generateNumberInRangeFromData(data[IDX_CHANNEL], kMinNumChannels, kMaxNumChannels); |
| 121 | FLAC__stream_encoder_set_channels(mFlacStreamEncoder, mChannels); |
| 122 | |
| 123 | int compression = generateNumberInRangeFromData(data[IDX_COMPRESSION_LEVEL], |
| 124 | kMinCompressionLevel, kMaxCompressionLevel); |
| 125 | FLAC__stream_encoder_set_compression_level(mFlacStreamEncoder, compression); |
| 126 | |
| 127 | uint32_t pcmEncodingInfo = |
| 128 | generateNumberInRangeFromData(data[IDX_PCM], (int)PCM_16, (int)PCM_FLOAT); |
| 129 | mPcmEncodingInfo = pcmEncodingInfo; |
| 130 | uint32_t bitsPerSample = (mPcmEncodingInfo == PCM_FLOAT) ? 24 : 16; |
| 131 | FLAC__stream_encoder_set_bits_per_sample(mFlacStreamEncoder, bitsPerSample); |
| 132 | |
| 133 | int ver = data[IDX_SET_VERIFY] % 2; |
| 134 | FLAC__stream_encoder_set_verify(mFlacStreamEncoder, ver); |
| 135 | |
| 136 | int streamableSubset = data[IDX_SET_STREAMABLE_SUBSET] % 2; |
| 137 | FLAC__stream_encoder_set_streamable_subset(mFlacStreamEncoder, streamableSubset); |
| 138 | |
| 139 | int doMidSideStereo = data[IDX_SET_DO_MID_SIDE_STEREO] % 2; |
| 140 | FLAC__stream_encoder_set_do_mid_side_stereo(mFlacStreamEncoder, doMidSideStereo); |
| 141 | |
| 142 | int looseMidSideStereo = data[IDX_SET_LOOSE_MID_SIDE_STEREO] % 2; |
| 143 | FLAC__stream_encoder_set_loose_mid_side_stereo(mFlacStreamEncoder, looseMidSideStereo); |
| 144 | |
| 145 | int maxLpcOrder = data[IDX_SET_MAX_LPC_ORDER] % 2; |
| 146 | FLAC__stream_encoder_set_max_lpc_order(mFlacStreamEncoder, maxLpcOrder); |
| 147 | |
| 148 | int coeffPrec = data[IDX_SET_COEFF_PRECISION] % 2; |
| 149 | FLAC__stream_encoder_set_qlp_coeff_precision(mFlacStreamEncoder, coeffPrec); |
| 150 | |
| 151 | int coeffPrecSearch = data[IDX_SET_COEFF_PREC_SEARCH] % 2; |
| 152 | FLAC__stream_encoder_set_do_qlp_coeff_prec_search(mFlacStreamEncoder, coeffPrecSearch); |
| 153 | |
| 154 | int escCoding = data[IDX_SET_DO_ESCAPE_CODING] % 2; |
| 155 | FLAC__stream_encoder_set_do_escape_coding(mFlacStreamEncoder, escCoding); |
| 156 | |
| 157 | int exhaustiveModelSearch = data[IDX_SET_DO_EXHAUSTIVE_MODEL_SEARCH] % 2; |
| 158 | FLAC__stream_encoder_set_do_exhaustive_model_search(mFlacStreamEncoder, exhaustiveModelSearch); |
| 159 | |
| 160 | int minResidualPartitionOrder = data[IDX_SET_MIN_RESIDUAL_PARTITION_ORDER] % 2; |
| 161 | FLAC__stream_encoder_set_min_residual_partition_order(mFlacStreamEncoder, |
| 162 | minResidualPartitionOrder); |
| 163 | |
| 164 | int maxResidualPartitionOrder = data[IDX_SET_MAX_RESIDUAL_PARTITION_ORDER] % 2; |
| 165 | FLAC__stream_encoder_set_max_residual_partition_order(mFlacStreamEncoder, |
| 166 | maxResidualPartitionOrder); |
| 167 | |
| 168 | int riceParam = data[IDX_SET_RICE_PARAMETER_SEARCH_DIST] % 2; |
| 169 | FLAC__stream_encoder_set_rice_parameter_search_dist(mFlacStreamEncoder, riceParam); |
| 170 | |
| 171 | int totalSamplesEstimate = data[IDX_SET_TOTAL_SAMPLES_ESTIMATE] % 2; |
| 172 | FLAC__stream_encoder_set_total_samples_estimate(mFlacStreamEncoder, totalSamplesEstimate); |
| 173 | |
| 174 | FLAC__StreamEncoderInitStatus status = FLAC__stream_encoder_init_stream( |
| 175 | mFlacStreamEncoder, flacEncoderWriteCallback /*write_callback*/, nullptr /*seek_callback*/, |
| 176 | nullptr /*tell_callback*/, nullptr /*metadata_callback*/, (void *)this /*client_data*/); |
| 177 | |
| 178 | if (status != FLAC__STREAM_ENCODER_INIT_STATUS_OK) { |
| 179 | return verifyStateAndReturn(); |
| 180 | } |
| 181 | |
| 182 | // Not re-using the data which was used for configuration for encoding |
| 183 | *dataPtr += IDX_LAST; |
| 184 | *sizePtr -= IDX_LAST; |
| 185 | return true; |
| 186 | } |
| 187 | |
| 188 | void Codec::encodeFrames(const uint8_t *data, size_t size) { |
| 189 | size_t sampleSize = (mPcmEncodingInfo == PCM_FLOAT) ? sizeof(float) : sizeof(int16_t); |
| 190 | size_t frameSize = mChannels * sampleSize; |
| 191 | do { |
| 192 | const size_t bytesConsumed = std::min(kFramesPerBlock * frameSize, size); |
| 193 | const unsigned inputFrames = bytesConsumed / frameSize; |
| 194 | const unsigned inputSamples = inputFrames * mChannels; |
| 195 | if (mPcmEncodingInfo == PCM_FLOAT) { |
| 196 | const float *const pcmFloat = reinterpret_cast<const float *>(data); |
| 197 | memcpy_to_q8_23_from_float_with_clamp(mInputBufferPcm32, pcmFloat, inputSamples); |
| 198 | } else { |
| 199 | const int16_t *const pcm16 = reinterpret_cast<const int16_t *>(data); |
| 200 | for (unsigned i = 0; i < inputSamples; ++i) { |
| 201 | mInputBufferPcm32[i] = (FLAC__int32)pcm16[i]; |
| 202 | } |
| 203 | } |
| 204 | FLAC__stream_encoder_process_interleaved(mFlacStreamEncoder, mInputBufferPcm32, |
| 205 | inputFrames); |
| 206 | data += bytesConsumed; |
| 207 | size -= bytesConsumed; |
| 208 | } while (size > 0); |
| 209 | } |
| 210 | |
| 211 | void Codec::deInitEncoder() { |
| 212 | if (mFlacStreamEncoder) { |
| 213 | FLAC__stream_encoder_finish(mFlacStreamEncoder); |
| 214 | FLAC__stream_encoder_delete(mFlacStreamEncoder); |
| 215 | mFlacStreamEncoder = nullptr; |
| 216 | } |
| 217 | } |
| 218 | |
| 219 | extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) { |
| 220 | if (size < IDX_LAST) { |
| 221 | return 0; |
| 222 | } |
| 223 | Codec encoder; |
| 224 | if (encoder.initEncoder(const_cast<uint8_t **>(&data), &size)) { |
| 225 | encoder.encodeFrames(data, size); |
| 226 | } |
| 227 | return 0; |
| 228 | } |