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/*
* Copyright (c) 2022 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 <algorithm>
#include <array>
#include <cmath>
#include <limits>
#include "modules/audio_processing/include/audio_processing.h"
#include "modules/audio_processing/test/audio_processing_builder_for_testing.h"
#include "rtc_base/checks.h"
#include "test/fuzzers/fuzz_data_helper.h"
namespace webrtc {
namespace {
constexpr int kMaxNumChannels = 2;
// APM supported max rate is 384000 Hz, using a limit slightly above lets the
// fuzzer exercise the handling of too high rates.
constexpr int kMaxSampleRateHz = 400000;
constexpr int kMaxSamplesPerChannel = kMaxSampleRateHz / 100;
void GenerateFloatFrame(test::FuzzDataHelper& fuzz_data,
int input_rate,
int num_channels,
float* const* float_frames) {
const int samples_per_input_channel =
AudioProcessing::GetFrameSize(input_rate);
RTC_DCHECK_LE(samples_per_input_channel, kMaxSamplesPerChannel);
for (int i = 0; i < num_channels; ++i) {
float channel_value;
fuzz_data.CopyTo<float>(&channel_value);
std::fill(float_frames[i], float_frames[i] + samples_per_input_channel,
channel_value);
}
}
void GenerateFixedFrame(test::FuzzDataHelper& fuzz_data,
int input_rate,
int num_channels,
int16_t* fixed_frames) {
const int samples_per_input_channel =
AudioProcessing::GetFrameSize(input_rate);
RTC_DCHECK_LE(samples_per_input_channel, kMaxSamplesPerChannel);
// Write interleaved samples.
for (int ch = 0; ch < num_channels; ++ch) {
const int16_t channel_value = fuzz_data.ReadOrDefaultValue<int16_t>(0);
for (int i = ch; i < samples_per_input_channel * num_channels;
i += num_channels) {
fixed_frames[i] = channel_value;
}
}
}
// No-op processor used to influence APM input/output pipeline decisions based
// on what submodules are present.
class NoopCustomProcessing : public CustomProcessing {
public:
NoopCustomProcessing() {}
~NoopCustomProcessing() override {}
void Initialize(int sample_rate_hz, int num_channels) override {}
void Process(AudioBuffer* audio) override {}
std::string ToString() const override { return ""; }
void SetRuntimeSetting(AudioProcessing::RuntimeSetting setting) override {}
};
} // namespace
// This fuzzer is directed at fuzzing unexpected input and output sample rates
// of APM. For example, the sample rate 22050 Hz is processed by APM in frames
// of floor(22050/100) = 220 samples. This is not exactly 10 ms of audio
// content, and may break assumptions commonly made on the APM frame size.
void FuzzOneInput(const uint8_t* data, size_t size) {
if (size > 100) {
return;
}
test::FuzzDataHelper fuzz_data(rtc::ArrayView<const uint8_t>(data, size));
std::unique_ptr<CustomProcessing> capture_processor =
fuzz_data.ReadOrDefaultValue(true)
? std::make_unique<NoopCustomProcessing>()
: nullptr;
std::unique_ptr<CustomProcessing> render_processor =
fuzz_data.ReadOrDefaultValue(true)
? std::make_unique<NoopCustomProcessing>()
: nullptr;
rtc::scoped_refptr<AudioProcessing> apm =
AudioProcessingBuilderForTesting()
.SetConfig({.pipeline = {.multi_channel_render = true,
.multi_channel_capture = true}})
.SetCapturePostProcessing(std::move(capture_processor))
.SetRenderPreProcessing(std::move(render_processor))
.Create();
RTC_DCHECK(apm);
std::array<int16_t, kMaxSamplesPerChannel * kMaxNumChannels> fixed_frame;
std::array<std::array<float, kMaxSamplesPerChannel>, kMaxNumChannels>
float_frames;
std::array<float*, kMaxNumChannels> float_frame_ptrs;
for (int i = 0; i < kMaxNumChannels; ++i) {
float_frame_ptrs[i] = float_frames[i].data();
}
float* const* ptr_to_float_frames = &float_frame_ptrs[0];
// Choose whether to fuzz the float or int16_t interfaces of APM.
const bool is_float = fuzz_data.ReadOrDefaultValue(true);
// We may run out of fuzz data in the middle of a loop iteration. In
// that case, default values will be used for the rest of that
// iteration.
while (fuzz_data.CanReadBytes(1)) {
// Decide input/output rate for this iteration.
const int input_rate = static_cast<int>(
fuzz_data.ReadOrDefaultValue<size_t>(8000) % kMaxSampleRateHz);
const int output_rate = static_cast<int>(
fuzz_data.ReadOrDefaultValue<size_t>(8000) % kMaxSampleRateHz);
const int num_channels = fuzz_data.ReadOrDefaultValue(true) ? 2 : 1;
// Since render and capture calls have slightly different reinitialization
// procedures, we let the fuzzer choose the order.
const bool is_capture = fuzz_data.ReadOrDefaultValue(true);
int apm_return_code = AudioProcessing::Error::kNoError;
if (is_float) {
GenerateFloatFrame(fuzz_data, input_rate, num_channels,
ptr_to_float_frames);
if (is_capture) {
apm_return_code = apm->ProcessStream(
ptr_to_float_frames, StreamConfig(input_rate, num_channels),
StreamConfig(output_rate, num_channels), ptr_to_float_frames);
} else {
apm_return_code = apm->ProcessReverseStream(
ptr_to_float_frames, StreamConfig(input_rate, num_channels),
StreamConfig(output_rate, num_channels), ptr_to_float_frames);
}
} else {
GenerateFixedFrame(fuzz_data, input_rate, num_channels,
fixed_frame.data());
if (is_capture) {
apm_return_code = apm->ProcessStream(
fixed_frame.data(), StreamConfig(input_rate, num_channels),
StreamConfig(output_rate, num_channels), fixed_frame.data());
} else {
apm_return_code = apm->ProcessReverseStream(
fixed_frame.data(), StreamConfig(input_rate, num_channels),
StreamConfig(output_rate, num_channels), fixed_frame.data());
}
}
// APM may flag an error on unsupported audio formats, but should not crash.
RTC_DCHECK(apm_return_code == AudioProcessing::kNoError ||
apm_return_code == AudioProcessing::kBadSampleRateError);
}
}
} // namespace webrtc
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