common.h

#pragma once

// needs to match WHISPER_SAMPLE_RATE
#define COMMON_SAMPLE_RATE 16000

#include <vector>
#include <string>

std::string trim(const std::string & s);

std::string replace(
        const std::string & s,
        const std::string & from,
        const std::string & to);

// Read WAV audio file and store the PCM data into pcmf32
// The sample rate of the audio must be equal to COMMON_SAMPLE_RATE
// If stereo flag is set and the audio has 2 channels, the pcmf32s will contain 2 channel PCM
bool read_wav(
        const std::string & fname,
        std::vector<float> & pcmf32,
        std::vector<std::vector<float>> & pcmf32s,
        bool stereo);

// Apply a high-pass frequency filter to PCM audio
// Suppresses frequencies below cutoff Hz
void high_pass_filter(
        std::vector<float> & data,
        float cutoff,
        float sample_rate);

// Basic voice activity detection (VAD) using audio energy adaptive threshold
bool vad_simple(
        std::vector<float> & pcmf32,
        int   sample_rate,
        int   last_ms,
        float vad_thold,
        float freq_thold,
        bool  verbose);