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/*
* Copyright (c) 2017 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 <math.h>
#include <string.h>
#include <algorithm>
#include <bitset>
#include <vector>
#include "api/audio/echo_detector_creator.h"
#include "rtc_base/checks.h"
namespace webrtc {
void FuzzOneInput(const uint8_t* data, size_t size) {
// Number of times to update the echo detector.
constexpr size_t kNrOfUpdates = 7;
// Each round of updates requires a call to both AnalyzeRender and
// AnalyzeCapture, so the amount of needed input bytes doubles. Also, two
// bytes are used to set the call order.
constexpr size_t kNrOfNeededInputBytes = 2 * kNrOfUpdates * sizeof(float) + 2;
// The maximum audio energy that an audio frame can have is equal to the
// number of samples in the frame multiplied by 2^30. We use a single sample
// to represent an audio frame in this test, so it should have a maximum value
// equal to the square root of that value.
const float maxFuzzedValue = sqrtf(20 * 48) * 32768;
if (size < kNrOfNeededInputBytes) {
return;
}
size_t read_idx = 0;
// Use the first two bytes to choose the call order.
uint16_t call_order_int;
memcpy(&call_order_int, &data[read_idx], 2);
read_idx += 2;
std::bitset<16> call_order(call_order_int);
rtc::scoped_refptr<EchoDetector> echo_detector = CreateEchoDetector();
std::vector<float> input(1);
// Call AnalyzeCaptureAudio once to prevent the flushing of the buffer.
echo_detector->AnalyzeCaptureAudio(input);
for (size_t i = 0; i < 2 * kNrOfUpdates; ++i) {
// Convert 4 input bytes to a float.
RTC_DCHECK_LE(read_idx + sizeof(float), size);
memcpy(input.data(), &data[read_idx], sizeof(float));
read_idx += sizeof(float);
if (!isfinite(input[0]) || fabs(input[0]) > maxFuzzedValue) {
// Ignore infinity, nan values and values that are unrealistically large.
continue;
}
if (call_order[i]) {
echo_detector->AnalyzeRenderAudio(input);
} else {
echo_detector->AnalyzeCaptureAudio(input);
}
}
}
} // namespace webrtc
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