1 files changed, 124 insertions, 0 deletions
diff --git a/fuzzer/opus_dec_fuzzer.cpp b/fuzzer/opus_dec_fuzzer.cpp
new file mode 100644
index 00000000..23bf69e4
--- /dev/null
+++ b/fuzzer/opus_dec_fuzzer.cpp
@@ -0,0 +1,124 @@
+/******************************************************************************
+ *
+ * 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;
+}