VoiceCapture.hpp

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#pragma once
 
#include "VoiceCodec.hpp"
 
#include <SDL3/SDL_audio.h>
 
#include <cstdint>
#include <string>
#include <string_view>
#include <vector>
 
class VoiceCapture
{
public:
    struct EncodedFrame
    {
        std::uint16_t sequence = 0;
        std::uint8_t frameMs = net::voice::k_frameMs;
        std::vector<std::uint8_t> opus;
    };
 
    bool init(std::string_view recordingDeviceName = {});
    void quit();
    void setRecordingDeviceName(std::string_view name);
    void setPushToTalk(bool active);
    [[nodiscard]] bool ready() const noexcept { return captureStream_ != nullptr && encoder_.ready(); }
    [[nodiscard]] bool transmitting() const noexcept { return transmitting_; }
    [[nodiscard]] std::vector<EncodedFrame> poll();
 
private:
    static constexpr int kFrameSamples = net::voice::k_sampleRate * net::voice::k_frameMs / 1000;
    static constexpr std::size_t kMaxAccumulatedSamples = static_cast<std::size_t>(kFrameSamples * 8);
 
    [[nodiscard]] bool framePassesNoiseGate(std::span<const float> frame) const noexcept;
 
    SDL_AudioStream* captureStream_ = nullptr;
    VoiceEncoder encoder_;
    std::string recordingDeviceName_;
    std::vector<float> capturePcm_;
    std::size_t captureReadOffset_ = 0;
    std::uint16_t nextSequence_ = 0;
    bool transmitting_ = false;
};