video-pc/AvRecorder/recorder/audio_recorder.cpp

#include "audio_recorder.h"

#include "capturer/audio/audio_qt_capturer.h"
#include "qdebug.h"

AudioRecorder::AudioRecorder() {}

AudioRecorder::~AudioRecorder()
{
    Close();
}

bool AudioRecorder::Open(const std::vector<AudioCapturer::Type>& deviceTypes,
                         Encoder<MediaType::AUDIO>::Param& param,
                         const uint32_t sampleRate,
                         const uint32_t channels,
                         const uint32_t bitsPerSample,
                         const AVSampleFormat format)
{
    qDebug() << "AudioRecorder::Open called, deviceTypes size:" << deviceTypes.size();
    Close();
    Info mixInfo;
    mixInfo.mixer = &_mixer;
    mixInfo.isRecord = &_isRecord;
    mixInfo.streamIndex = &_streamIndex;

    // 清空并重新创建音频捕获器
    m_audioCapturers.clear();
    for (int index = 0; index < deviceTypes.size(); ++index) {
        mixInfo.mixIndex = index;
        _infos.push_back(mixInfo);
        m_audioCapturers.push_back(new QtAudioCapturer());
    }

    // 初始化每个音频捕获器
    for (int index = 0; index < deviceTypes.size(); ++index) {
        auto capturer = m_audioCapturers[index];
        if (!capturer->Init(deviceTypes[index])) {
            continue;
        }
        auto&& format = capturer->GetFormat();
        __CheckBool(_mixer.AddAudioInput(index,
                                         format.sampleRate,
                                         format.channels,
                                         format.bitsPerSample,
                                         _GetAVSampleFormat(format.bitsPerSample)));
    }

    __CheckBool(_mixer.AddAudioOutput(sampleRate, channels, bitsPerSample, format));
    _param = param;
    __CheckBool(_mixer.SetOutFrameSize(1024));

    // 启动所有成功初始化的音频捕获器
    for (auto capturer : m_audioCapturers) {
        capturer->Start();
    }
    return true;
}

void AudioRecorder::Close()
{
    StopRecord();

    // 停止并释放所有音频捕获器
    for (auto capturer : m_audioCapturers) {
        if (capturer) {
            capturer->Stop();
            delete capturer;
        }
    }
    m_audioCapturers.clear();

    _mixer.Close();
    _infos.clear();
}

void AudioRecorder::SetVolumeScale(float scale, int mixIndex)
{
    auto info = _mixer.GetInputInfo(mixIndex);
    if (info != nullptr) {
        info->scale = scale;
    }
}

bool AudioRecorder::LoadMuxer(AvMuxer& muxer)
{
    for (auto&& info : _infos) {
        info.muxer = &muxer;
    }
    __CheckBool((_streamIndex = muxer.AddAudioStream(_param)) != -1);
    return true;
}

bool AudioRecorder::StartRecord()
{
    _isRecord = true;
    m_audioTimer.Start(AUDIO_PULL_INTERVAL_MS, [this] {
        this->PullAndProcessAudio();
    });
    return true;
}

void AudioRecorder::StopRecord()
{
    _isRecord = false;
    m_audioTimer.Stop();
}

// 新增：主动拉取音频数据的接口
void AudioRecorder::PullAndProcessAudio()
{
    for (int index = 0; index < m_audioCapturers.size(); ++index) {
        // 每次多次拉取小块数据，提升音频帧写入频率
        while (true) {
            char buf[1024];
            int bytes = m_audioCapturers[index]->readAudioData(buf, sizeof(buf));
            if (bytes <= 0) break;
            auto frame = _mixer.Convert(index, (uint8_t*)buf, bytes);
            if (frame && _isRecord && _streamIndex != -1) {
                int frameSize = _mixer.GetOutFrameSize();
                if (_mixer.GetOutFrameSize() != frameSize) {
                    _mixer.SetOutFrameSize(frameSize);
                    continue;
                }
                _infos[index].muxer->Write(frame, _streamIndex);
            }
        }
    }
}