1 files changed, 61 insertions, 0 deletions
diff --git a/third_party/libwebrtc/test/fuzzers/audio_decoder_multistream_opus_fuzzer.cc b/third_party/libwebrtc/test/fuzzers/audio_decoder_multistream_opus_fuzzer.cc
new file mode 100644
index 0000000000..474a1cdc43
--- /dev/null
+++ b/third_party/libwebrtc/test/fuzzers/audio_decoder_multistream_opus_fuzzer.cc
@@ -0,0 +1,61 @@
+/*
+ *  Copyright (c) 2019 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "api/audio_codecs/opus/audio_decoder_multi_channel_opus.h"
+#include "api/audio_codecs/opus/audio_decoder_multi_channel_opus_config.h"
+#include "test/fuzzers/audio_decoder_fuzzer.h"
+
+namespace webrtc {
+
+AudioDecoderMultiChannelOpusConfig MakeDecoderConfig(
+    int num_channels,
+    int num_streams,
+    int coupled_streams,
+    std::vector<unsigned char> channel_mapping) {
+  AudioDecoderMultiChannelOpusConfig config;
+  config.num_channels = num_channels;
+  config.num_streams = num_streams;
+  config.coupled_streams = coupled_streams;
+  config.channel_mapping = channel_mapping;
+  return config;
+}
+
+void FuzzOneInput(const uint8_t* data, size_t size) {
+  const std::vector<AudioDecoderMultiChannelOpusConfig> surround_configs = {
+      MakeDecoderConfig(1, 1, 0, {0}),  // Mono
+
+      MakeDecoderConfig(2, 2, 0, {0, 0}),  // Copy the first (of
+                                           // 2) decoded streams
+                                           // into both output
+                                           // channel 0 and output
+                                           // channel 1. Ignore
+                                           // the 2nd decoded
+                                           // stream.
+
+      MakeDecoderConfig(4, 2, 2, {0, 1, 2, 3}),             // Quad.
+      MakeDecoderConfig(6, 4, 2, {0, 4, 1, 2, 3, 5}),       // 5.1
+      MakeDecoderConfig(8, 5, 3, {0, 6, 1, 2, 3, 4, 5, 7})  // 7.1
+  };
+
+  const auto config = surround_configs[data[0] % surround_configs.size()];
+  RTC_CHECK(config.IsOk());
+  std::unique_ptr<AudioDecoder> dec =
+      AudioDecoderMultiChannelOpus::MakeAudioDecoder(config);
+  RTC_CHECK(dec);
+  const int kSampleRateHz = 48000;
+  const size_t kAllocatedOuputSizeSamples =
+      4 * kSampleRateHz / 10;  // 4x100 ms, 4 times the size of the output array
+                               // for the stereo Opus codec. It should be enough
+                               // for 8 channels.
+  int16_t output[kAllocatedOuputSizeSamples];
+  FuzzAudioDecoder(DecoderFunctionType::kNormalDecode, data, size, dec.get(),
+                   kSampleRateHz, sizeof(output), output);
+}
+}  // namespace webrtc