1/*
2 *  Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
3 *
4 *  Use of this source code is governed by a BSD-style license
5 *  that can be found in the LICENSE file in the root of the source
6 *  tree. An additional intellectual property rights grant can be found
7 *  in the file PATENTS.  All contributing project authors may
8 *  be found in the AUTHORS file in the root of the source tree.
9 */
10
11#include "webrtc/test/fuzzers/audio_decoder_fuzzer.h"
12
13#include "webrtc/base/checks.h"
14#include "webrtc/modules/audio_coding/codecs/audio_decoder.h"
15
16namespace webrtc {
17namespace {
18size_t PacketSizeFromTwoBytes(const uint8_t* data, size_t size) {
19  if (size < 2)
20    return 0;
21  return static_cast<size_t>((data[0] << 8) + data[1]);
22}
23}  // namespace
24
25// This function reads two bytes from the beginning of |data|, interprets them
26// as the first packet length, and reads this many bytes if available. The
27// payload is inserted into the decoder, and the process continues until no more
28// data is available.
29void FuzzAudioDecoder(const uint8_t* data,
30                      size_t size,
31                      AudioDecoder* decoder,
32                      int sample_rate_hz,
33                      size_t max_decoded_bytes,
34                      int16_t* decoded) {
35  const uint8_t* data_ptr = data;
36  size_t remaining_size = size;
37  size_t packet_len = PacketSizeFromTwoBytes(data_ptr, remaining_size);
38  while (packet_len != 0 && packet_len <= remaining_size - 2) {
39    data_ptr += 2;
40    remaining_size -= 2;
41    AudioDecoder::SpeechType speech_type;
42    decoder->Decode(data_ptr, packet_len, sample_rate_hz, max_decoded_bytes,
43                    decoded, &speech_type);
44    data_ptr += packet_len;
45    remaining_size -= packet_len;
46    packet_len = PacketSizeFromTwoBytes(data_ptr, remaining_size);
47  }
48}
49}  // namespace webrtc
50