audio_io.cpp - mozsearch

Enable keyboard shortcuts

#include "audio_io.hpp"

#include "common.hpp"

#include <cmath>

namespace pk {

std::vector<float> resample_linear(const std::vector<float>& in, int in_sr, int out_sr) {

    if (in_sr == out_sr || in.empty()) return in;

    const double ratio = (double)out_sr / (double)in_sr;

    const size_t n_out = (size_t)std::floor(in.size() * ratio);

    std::vector<float> out(n_out);

    for (size_t i = 0; i < n_out; ++i) {

        const double src = i / ratio;

        const size_t i0 = (size_t)src;

        const double frac = src - i0;

        const float a = in[i0];

        const float b = (i0 + 1 < in.size()) ? in[i0 + 1] : a;

        out[i] = (float)(a + (b - a) * frac);

    return out;

bool load_audio_16k_mono(const std::string& path, Audio& out) {

    // Firefox-local: dr_wav.h is not vendored, so WAV-file loading is

    // unsupported here. Firefox only feeds PCM directly (transcribe_pcm*).

    PK_LOG("load_audio_16k_mono: WAV file loading not supported in this build: %s", path.c_str());

    return false;

} // namespace pk