Create fuzzer tests for audio decoders

This change adds fuzzer tests for iLBC, iSAC fix and float, and
Opus. The fuzzer function takes a random input vector and splits it
into a number of payloads. The lengths of the payloads is also
determined by the random vector. The payloads are decoded with the
decoders.

BUG=webrtc:5306
R=kjellander@webrtc.org, pbos@webrtc.org

Review URL: https://codereview.webrtc.org/1499093002 .

Cr-Commit-Position: refs/heads/master@{#10932}

webrtc/BUILD.gn

@@ -284,6 +284,10 @@ if (use_libfuzzer) {
   group("webrtc_fuzzers") {
     testonly = true
     deps = [
+      "test/fuzzers:audio_decoder_ilbc_fuzzer",
+      "test/fuzzers:audio_decoder_isac_fuzzer",
+      "test/fuzzers:audio_decoder_isacfix_fuzzer",
+      "test/fuzzers:audio_decoder_opus_fuzzer",
       "test/fuzzers:vp8_qp_parser_fuzzer",
       "test/fuzzers:vp9_depacketizer_fuzzer",
     ]

webrtc/test/fuzzers/BUILD.gn

@@ -10,6 +10,7 @@ import("//build/config/features.gni")
 import("//testing/test.gni")
 
 static_library("webrtc_fuzzer_main") {
+  public_configs = [ "../..:common_inherited_config" ]
   sources = [
     "webrtc_fuzzer_main.cc",
   ]
@@ -50,3 +51,53 @@ test("vp8_qp_parser_fuzzer") {
     configs -= [ "//build/config/clang:find_bad_constructs" ]
   }
 }
+
+source_set("audio_decoder_fuzzer") {
+  sources = [
+    "audio_decoder_fuzzer.cc",
+    "audio_decoder_fuzzer.h",
+  ]
+  deps = [
+    ":webrtc_fuzzer_main",
+  ]
+}
+
+test("audio_decoder_ilbc_fuzzer") {
+  sources = [
+    "audio_decoder_ilbc_fuzzer.cc",
+  ]
+  deps = [
+    ":audio_decoder_fuzzer",
+    "../../modules/audio_coding:ilbc",
+  ]
+}
+
+test("audio_decoder_isac_fuzzer") {
+  sources = [
+    "audio_decoder_isac_fuzzer.cc",
+  ]
+  deps = [
+    ":audio_decoder_fuzzer",
+    "../../modules/audio_coding:isac",
+  ]
+}
+
+test("audio_decoder_isacfix_fuzzer") {
+  sources = [
+    "audio_decoder_isacfix_fuzzer.cc",
+  ]
+  deps = [
+    ":audio_decoder_fuzzer",
+    "../../modules/audio_coding:isac_fix",
+  ]
+}
+
+test("audio_decoder_opus_fuzzer") {
+  sources = [
+    "audio_decoder_opus_fuzzer.cc",
+  ]
+  deps = [
+    ":audio_decoder_fuzzer",
+    "../../modules/audio_coding:webrtc_opus",
+  ]
+}

webrtc/test/fuzzers/audio_decoder_fuzzer.cc

@@ -0,0 +1,49 @@
+/*
+ *  Copyright (c) 2015 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 "webrtc/test/fuzzers/audio_decoder_fuzzer.h"
+
+#include "webrtc/base/checks.h"
+#include "webrtc/modules/audio_coding/codecs/audio_decoder.h"
+
+namespace webrtc {
+namespace {
+size_t PacketSizeFromTwoBytes(const uint8_t* data, size_t size) {
+  if (size < 2)
+    return 0;
+  return static_cast<size_t>((data[0] << 8) + data[1]);
+}
+}  // namespace
+
+// This function reads two bytes from the beginning of |data|, interprets them
+// as the first packet length, and reads this many bytes if available. The
+// payload is inserted into the decoder, and the process continues until no more
+// data is available.
+void FuzzAudioDecoder(const uint8_t* data,
+                      size_t size,
+                      AudioDecoder* decoder,
+                      int sample_rate_hz,
+                      size_t max_decoded_bytes,
+                      int16_t* decoded) {
+  const uint8_t* data_ptr = data;
+  size_t remaining_size = size;
+  size_t packet_len = PacketSizeFromTwoBytes(data_ptr, remaining_size);
+  while (packet_len != 0 && packet_len <= remaining_size - 2) {
+    data_ptr += 2;
+    remaining_size -= 2;
+    AudioDecoder::SpeechType speech_type;
+    decoder->Decode(data_ptr, packet_len, sample_rate_hz, max_decoded_bytes,
+                    decoded, &speech_type);
+    data_ptr += packet_len;
+    remaining_size -= packet_len;
+    packet_len = PacketSizeFromTwoBytes(data_ptr, remaining_size);
+  }
+}
+}  // namespace webrtc

webrtc/test/fuzzers/audio_decoder_fuzzer.h

@@ -0,0 +1,31 @@
+/*
+ *  Copyright (c) 2015 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.
+ */
+
+#ifndef WEBRTC_TEST_FUZZERS_AUDIO_DECODER_FUZZER_H_
+#define WEBRTC_TEST_FUZZERS_AUDIO_DECODER_FUZZER_H_
+
+#include <stddef.h>
+
+#include "webrtc/typedefs.h"
+
+namespace webrtc {
+
+class AudioDecoder;
+
+void FuzzAudioDecoder(const uint8_t* data,
+                      size_t size,
+                      AudioDecoder* decoder,
+                      int sample_rate_hz,
+                      size_t max_decoded_bytes,
+                      int16_t* decoded);
+
+}  // namespace webrtc
+
+#endif  // WEBRTC_TEST_FUZZERS_AUDIO_DECODER_FUZZER_H_

webrtc/test/fuzzers/audio_decoder_ilbc_fuzzer.cc

@@ -0,0 +1,22 @@
+/*
+ *  Copyright (c) 2015 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 "webrtc/modules/audio_coding/codecs/ilbc/audio_decoder_ilbc.h"
+#include "webrtc/test/fuzzers/audio_decoder_fuzzer.h"
+
+namespace webrtc {
+void FuzzOneInput(const uint8_t* data, size_t size) {
+  AudioDecoderIlbc dec;
+  static const int kSampleRateHz = 8000;
+  static const size_t kAllocatedOuputSizeSamples = kSampleRateHz / 10;
+  int16_t output[kAllocatedOuputSizeSamples];
+  FuzzAudioDecoder(data, size, &dec, kSampleRateHz, sizeof(output), output);
+}
+}  // namespace webrtc

webrtc/test/fuzzers/audio_decoder_isac_fuzzer.cc

@@ -0,0 +1,22 @@
+/*
+ *  Copyright (c) 2015 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 "webrtc/modules/audio_coding/codecs/isac/main/include/audio_decoder_isac.h"
+#include "webrtc/test/fuzzers/audio_decoder_fuzzer.h"
+
+namespace webrtc {
+void FuzzOneInput(const uint8_t* data, size_t size) {
+  AudioDecoderIsac dec(nullptr);
+  const int sample_rate_hz = size % 2 == 0 ? 16000 : 32000;     // 16 or 32 kHz.
+  static const size_t kAllocatedOuputSizeSamples = 32000 / 10;  // 100 ms.
+  int16_t output[kAllocatedOuputSizeSamples];
+  FuzzAudioDecoder(data, size, &dec, sample_rate_hz, sizeof(output), output);
+}
+}  // namespace webrtc

webrtc/test/fuzzers/audio_decoder_isacfix_fuzzer.cc

@@ -0,0 +1,22 @@
+/*
+ *  Copyright (c) 2015 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 "webrtc/modules/audio_coding/codecs/isac/fix/include/audio_decoder_isacfix.h"
+#include "webrtc/test/fuzzers/audio_decoder_fuzzer.h"
+
+namespace webrtc {
+void FuzzOneInput(const uint8_t* data, size_t size) {
+  AudioDecoderIsacFix dec(nullptr);
+  static const int kSampleRateHz = 16000;
+  static const size_t kAllocatedOuputSizeSamples = 16000 / 10;  // 100 ms.
+  int16_t output[kAllocatedOuputSizeSamples];
+  FuzzAudioDecoder(data, size, &dec, kSampleRateHz, sizeof(output), output);
+}
+}  // namespace webrtc

webrtc/test/fuzzers/audio_decoder_opus_fuzzer.cc

@@ -0,0 +1,23 @@
+/*
+ *  Copyright (c) 2015 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 "webrtc/modules/audio_coding/codecs/opus/audio_decoder_opus.h"
+#include "webrtc/test/fuzzers/audio_decoder_fuzzer.h"
+
+namespace webrtc {
+void FuzzOneInput(const uint8_t* data, size_t size) {
+  const size_t channels = (size % 2) + 1;  // 1 or 2 channels.
+  AudioDecoderOpus dec(channels);
+  const int kSampleRateHz = 48000;
+  const size_t kAllocatedOuputSizeSamples = kSampleRateHz / 10;  // 100 ms.
+  int16_t output[kAllocatedOuputSizeSamples];
+  FuzzAudioDecoder(data, size, &dec, kSampleRateHz, sizeof(output), output);
+}
+}  // namespace webrtc