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#include "engine/framework/audio/mel_spectrogram_frontend.h"
#include <algorithm>
#include <cmath>
#include <cstring>
#include <iostream>
#include <stdexcept>
#include <string>
#include <vector>
namespace {
using engine::audio::MelLogPrecision;
using engine::audio::MelFilterbankNormalization;
using engine::audio::MelHannWindow;
using engine::audio::MelOutputLayout;
using engine::audio::MelValueTransform;
using engine::audio::MelSpectrumMode;
using engine::audio::MelFilterbankProjection;
using engine::audio::MelSpectrogramFeatures;
using engine::audio::MelSpectrogramFrontendConfig;
MelSpectrogramFeatures
legacy_projection(const std::vector<float> &planar, int64_t channels,
const MelSpectrogramFrontendConfig &config) {
const int64_t samples = static_cast<int64_t>(planar.size()) / channels;
const auto window_family = config.window == MelHannWindow::Periodic
? engine::audio::STFTFamily::Kokoro
: engine::audio::STFTFamily::Default;
const engine::audio::STFTConfig stft_config{
config.n_fft, config.hop_length, config.win_length,
config.stft_center, config.stft_pad_mode, window_family,
};
const auto &window = engine::audio::get_cached_stft_window(stft_config);
const auto magnitude = engine::audio::STFT().compute_magnitude(
planar, window, channels, samples, stft_config, 1);
const int64_t freq_bins = magnitude.shape[1];
const int64_t stft_frames = magnitude.shape[2];
const int64_t frames =
config.max_frames > 0
? std::min(stft_frames - config.drop_last_frames, config.max_frames)
: stft_frames - config.drop_last_frames;
const auto filterbank = engine::audio::MelFilterbank().build({
config.sample_rate,
config.n_fft,
config.n_mels,
config.mel_fmin,
config.mel_fmax,
config.filterbank_normalization == MelFilterbankNormalization::Slaney,
});
const auto sparse = engine::audio::MelFilterbank().prepare_sparse(filterbank);
MelSpectrogramFeatures out;
out.channels = channels;
out.frames = ((frames + config.frame_multiple - 1) / config.frame_multiple) *
config.frame_multiple;
out.mel_bins = config.n_mels;
out.values.assign(static_cast<size_t>(channels * out.frames * config.n_mels),
config.frame_pad_value);
for (int64_t channel = 0; channel < channels; ++channel) {
for (int64_t mel = 0; mel < config.n_mels; ++mel) {
for (int64_t frame = 0; frame < frames; ++frame) {
float sum = 0.0f;
double double_sum = 0.0;
long double wide_sum = 0.0;
const int64_t start = config.filterbank_projection == MelFilterbankProjection::SparseF32
? sparse.starts[static_cast<size_t>(mel)]
: 0;
const int64_t end = config.filterbank_projection == MelFilterbankProjection::SparseF32
? sparse.ends[static_cast<size_t>(mel)]
: freq_bins;
for (int64_t freq = start; freq < end; ++freq) {
float value = magnitude.values[static_cast<size_t>(
((channel * freq_bins + freq) * stft_frames) + frame)];
if (config.magnitude_epsilon > 0.0f) {
value = std::sqrt(value * value + config.magnitude_epsilon);
}
if (config.spectrum_mode == MelSpectrumMode::PowerBeforeProjection) {
value *= value;
}
const float weight =
filterbank.values[static_cast<size_t>(mel * freq_bins + freq)];
if (config.filterbank_projection == MelFilterbankProjection::DenseLongDouble) {
wide_sum += static_cast<long double>(weight) *
static_cast<long double>(value);
} else if (config.filterbank_projection == MelFilterbankProjection::DenseF64) {
double_sum +=
static_cast<double>(weight) * static_cast<double>(value);
} else if (config.spectrum_mode == MelSpectrumMode::PowerDuringProjection) {
sum += weight * value * value;
} else {
sum += weight * value;
}
}
if (config.filterbank_projection == MelFilterbankProjection::DenseLongDouble) {
sum = static_cast<float>(wide_sum);
}
const size_t output_index =
config.layout == MelOutputLayout::FeatureMajor
? static_cast<size_t>(
((channel * config.n_mels + mel) * out.frames) + frame)
: static_cast<size_t>(
((channel * out.frames + frame) * config.n_mels) + mel);
if (config.filterbank_projection == MelFilterbankProjection::DenseF64) {
out.values[output_index] =
config.value_transform == MelValueTransform::None
? static_cast<float>(double_sum)
: config.value_transform == MelValueTransform::Log10
? static_cast<float>(
std::log10(std::max(double_sum, config.log_floor)))
: static_cast<float>(
std::log(std::max(double_sum, config.log_floor)));
} else {
out.values[output_index] =
config.value_transform == MelValueTransform::None ? sum
: config.value_transform == MelValueTransform::Log10
? config.log_precision == MelLogPrecision::F64
? static_cast<float>(std::log10(std::max(
static_cast<double>(sum), config.log_floor)))
: std::log10(std::max(
sum, static_cast<float>(config.log_floor)))
: config.log_precision == MelLogPrecision::F64
? static_cast<float>(std::log(
std::max(static_cast<double>(sum), config.log_floor)))
: std::log(
std::max(sum, static_cast<float>(config.log_floor)));
}
}
}
}
if (config.log_dynamic_range > 0.0f) {
const float peak = *std::max_element(out.values.begin(), out.values.end());
const float floor = peak - config.log_dynamic_range;
for (float &value : out.values) {
value = (std::max(value, floor) + config.log_shift) / config.log_divisor;
}
}
return out;
}
std::vector<float> make_planar_waveform(int64_t channels, int64_t samples) {
constexpr double kPi = 3.14159265358979323846;
std::vector<float> waveform(static_cast<size_t>(channels * samples));
for (int64_t channel = 0; channel < channels; ++channel) {
for (int64_t sample = 0; sample < samples; ++sample) {
const double time = static_cast<double>(sample) / 16000.0;
waveform[static_cast<size_t>(channel * samples + sample)] =
static_cast<float>(
0.4 * std::sin(2.0 * kPi * (180.0 + 37.0 * channel) * time) +
0.13 * std::cos(2.0 * kPi * 713.0 * time));
}
}
return waveform;
}
void require_bitwise_equal(const MelSpectrogramFeatures &actual,
const MelSpectrogramFeatures &expected,
const std::string &label) {
if (actual.channels != expected.channels ||
actual.frames != expected.frames || actual.mel_bins != expected.mel_bins ||
actual.values.size() != expected.values.size()) {
throw std::runtime_error(label + " shape mismatch");
}
if (std::memcmp(actual.values.data(), expected.values.data(),
actual.values.size() * sizeof(float)) != 0) {
for (size_t index = 0; index < actual.values.size(); ++index) {
if (std::memcmp(&actual.values[index], &expected.values[index],
sizeof(float)) != 0) {
throw std::runtime_error(label + " value mismatch at index " +
std::to_string(index));
}
}
}
}
void test_optimized_projection_matches_legacy_loop() {
MelSpectrogramFrontendConfig base;
base.sample_rate = 16000;
base.n_fft = 64;
base.hop_length = 16;
base.win_length = 64;
base.n_mels = 12;
base.mel_fmin = 20.0f;
base.mel_fmax = 7600.0f;
base.stft_center = true;
base.waveform_padding = engine::audio::MelWaveformPadding::None;
base.frame_multiple = 4;
base.frame_pad_value = 17.0f;
const auto waveform = make_planar_waveform(2, 2053);
std::vector<MelSpectrogramFrontendConfig> cases;
cases.push_back(base);
auto config = base;
config.filterbank_projection = MelFilterbankProjection::SparseF32;
config.magnitude_epsilon = 1.0e-9f;
cases.push_back(config);
config = base;
config.spectrum_mode = MelSpectrumMode::PowerBeforeProjection;
config.value_transform = MelValueTransform::Log10;
config.layout = MelOutputLayout::TimeMajor;
cases.push_back(config);
config = base;
config.filterbank_projection = MelFilterbankProjection::SparseF32;
config.spectrum_mode = MelSpectrumMode::PowerDuringProjection;
config.value_transform = MelValueTransform::Log10;
config.log_dynamic_range = 8.0f;
config.log_shift = 4.0f;
config.log_divisor = 4.0f;
cases.push_back(config);
config = base;
config.filterbank_projection = MelFilterbankProjection::DenseF64;
config.magnitude_epsilon = 1.0e-9f;
config.value_transform = MelValueTransform::Log10;
config.layout = MelOutputLayout::TimeMajor;
cases.push_back(config);
config = base;
config.filterbank_projection = MelFilterbankProjection::DenseLongDouble;
config.log_precision = MelLogPrecision::F64;
config.layout = MelOutputLayout::TimeMajor;
cases.push_back(config);
config = base;
config.filterbank_projection = MelFilterbankProjection::DenseLongDouble;
config.spectrum_mode = MelSpectrumMode::PowerBeforeProjection;
config.value_transform = MelValueTransform::None;
cases.push_back(config);
for (size_t index = 0; index < cases.size(); ++index) {
const auto expected = legacy_projection(waveform, 2, cases[index]);
const auto actual = engine::audio::MelSpectrogramFrontend(cases[index])
.extract_planar(waveform, 2, 1);
require_bitwise_equal(actual, expected,
"mel projection case " + std::to_string(index));
}
}
} // namespace
int main() {
try {
test_optimized_projection_matches_legacy_loop();
std::cout << "mel spectrogram frontend tests passed\n";
return 0;
} catch (const std::exception &error) {
std::cerr << "mel spectrogram frontend test failed: " << error.what()
<< '\n';
return 1;
}
}