video-pc/libs/Recorder/record_audio_wasapi.cpp

#include "record_audio_wasapi.h"
#include "headers_ffmpeg.h"

#include <string>

#include "error_define.h"
#include "system_error.h"
#include "utils_string.h"

#include "log_helper.h"

#ifdef _WIN32

#define NS_PER_SEC 1000000000
#define REFTIMES_PER_SEC NS_PER_SEC / 100 //100ns per buffer unit

#endif // _WIN32

namespace am {
record_audio_wasapi::record_audio_wasapi()
{
    _co_inited = false;

    HRESULT hr = CoInitializeEx(NULL, COINIT_MULTITHREADED);
    DWORD err = GetLastError();
    if (hr != S_OK && err != S_OK)
        al_error("%s,error:%s", err2str(AE_CO_INITED_FAILED), system_error::error2str(err).c_str());

    _co_inited = (hr == S_OK || hr == S_FALSE); //if already initialize will return S_FALSE

    _is_default = false;

    _wfex = NULL;
    _enumerator = nullptr;
    _device = nullptr;
    _capture_client = nullptr;
    _capture = nullptr;
    _render = nullptr;
    _render_client = nullptr;

    _capture_sample_count = 0;
    _render_sample_count = 0;

    _ready_event = NULL;
    _stop_event = NULL;
    _render_event = NULL;

    _use_device_ts = false;

    _start_time = 0;
}

record_audio_wasapi::~record_audio_wasapi()
{
    stop();

    clean_wasapi();

    if (_co_inited == true)
        CoUninitialize();
}

void get_device_info(IMMDevice *device)
{
    HRESULT resSample;
    IPropertyStore *store = nullptr;
    PWAVEFORMATEX deviceFormatProperties;
    PROPVARIANT prop;
    resSample = device->OpenPropertyStore(STGM_READ, &store);
    if (!FAILED(resSample)) {
        resSample = store->GetValue(PKEY_AudioEngine_DeviceFormat, &prop);
        if (!FAILED(resSample)) {
            deviceFormatProperties = (PWAVEFORMATEX) prop.blob.pBlobData;
            std::string device_sample = std::to_string(deviceFormatProperties->nSamplesPerSec);
        }
    }
}

#define KSAUDIO_SPEAKER_2POINT1 (KSAUDIO_SPEAKER_STEREO | SPEAKER_LOW_FREQUENCY)

#define OBS_KSAUDIO_SPEAKER_4POINT1 (KSAUDIO_SPEAKER_SURROUND | SPEAKER_LOW_FREQUENCY)

int64_t record_audio_wasapi::convert_layout(DWORD layout, WORD channels)
{
    switch (layout) {
    case KSAUDIO_SPEAKER_2POINT1:
        return AV_CH_LAYOUT_SURROUND;
    case KSAUDIO_SPEAKER_SURROUND:
        return AV_CH_LAYOUT_4POINT0;
    case OBS_KSAUDIO_SPEAKER_4POINT1:
        return AV_CH_LAYOUT_4POINT1;
    case KSAUDIO_SPEAKER_5POINT1_SURROUND:
        return AV_CH_LAYOUT_5POINT1_BACK;
    case KSAUDIO_SPEAKER_7POINT1_SURROUND:
        return AV_CH_LAYOUT_7POINT1;
    }

    return ffmpeg_get_default_channel_layout(channels);
}

void record_audio_wasapi::init_format(WAVEFORMATEX *wfex)
{
    DWORD layout = 0;

    if (wfex->wFormatTag == WAVE_FORMAT_EXTENSIBLE) {
        WAVEFORMATEXTENSIBLE *ext = (WAVEFORMATEXTENSIBLE *) wfex;
        layout = ext->dwChannelMask;
    }

    _channel_layout = convert_layout(layout, wfex->nChannels);
    _sample_rate = wfex->nSamplesPerSec;
    _bit_rate = wfex->nAvgBytesPerSec;
    _bit_per_sample = wfex->wBitsPerSample;
    _channel_num = wfex->nChannels;

    //wasapi is always flt
    _fmt = AV_SAMPLE_FMT_FLT;
}

int record_audio_wasapi::init_render()
{
    int error = AE_NO;
    HRESULT res = S_OK;

    do {
        res = _device->Activate(__uuidof(IAudioClient),
                                CLSCTX_ALL,
                                nullptr,
                                (void **) &_render_client);

        if (FAILED(res)) {
            error = AE_CO_ACTIVE_DEVICE_FAILED;
            break;
        }

        WAVEFORMATEX *wfex;
        res = _render_client->GetMixFormat(&wfex);
        if (FAILED(res)) {
            error = AE_CO_GET_FORMAT_FAILED;
            break;
        }

        res = _render_client->Initialize(AUDCLNT_SHAREMODE_SHARED,
                                         AUDCLNT_STREAMFLAGS_EVENTCALLBACK,
                                         REFTIMES_PER_SEC,
                                         0,
                                         wfex,
                                         nullptr);

        CoTaskMemFree(wfex);
        if (FAILED(res)) {
            error = AE_CO_AUDIOCLIENT_INIT_FAILED;
            break;
        }

        /* Silent loopback fix. Prevents audio stream from stopping and */
        /* messing up timestamps and other weird glitches during silence */
        /* by playing a silent sample all over again. */

        res = _render_client->GetService(__uuidof(IAudioRenderClient), (void **) &_render);
        if (FAILED(res)) {
            error = AE_CO_GET_CAPTURE_FAILED;
            break;
        }

        _render_event = CreateEvent(NULL, FALSE, FALSE, NULL);
        if (!_render_event) {
            error = AE_CO_CREATE_EVENT_FAILED;
            break;
        }

        res = _render_client->SetEventHandle(_render_event);
        if (FAILED(res)) {
            error = AE_CO_SET_EVENT_FAILED;
            break;
        }

        //pre fill a single silent buffer
        res = _render_client->GetBufferSize(&_render_sample_count);
        if (FAILED(res)) {
            error = AE_CO_GET_VALUE_FAILED;
            break;
        }

        uint8_t *buffer = NULL;
        res = _render->GetBuffer(_render_sample_count, &buffer);
        if (FAILED(res)) {
            error = AE_CO_GET_VALUE_FAILED;
            break;
        }

        res = _render->ReleaseBuffer(_render_sample_count, AUDCLNT_BUFFERFLAGS_SILENT);
        if (FAILED(res)) {
            error = AE_CO_RELEASE_BUFFER_FAILED;
            break;
        }
    } while (0);

    if (error != AE_NO)
        al_error("init render failed(%ld), %s,lasterror:%lu", res, err2str(error), GetLastError());

    return error;
}

int record_audio_wasapi::init(const std::string &device_name,
                              const std::string &device_id,
                              bool is_input)
{
    int error = AE_NO;
    HRESULT hr = S_OK;

    al_info("wasapi start to initialize in %s mode with: %s",
            is_input ? "input" : "output",
            device_name.c_str());

    if (_co_inited == false) {
        return AE_CO_INITED_FAILED;
    }

    if (_inited == true) {
        return AE_NO;
    }

    _device_name = device_name;
    _device_id = device_id;
    _is_input = is_input;
    _is_default = (utils_string::ascii_utf8(DEFAULT_AUDIO_INOUTPUT_ID).compare(_device_id) == 0);

    do {
        hr = CoCreateInstance(__uuidof(MMDeviceEnumerator),
                              NULL,
                              CLSCTX_ALL,
                              __uuidof(IMMDeviceEnumerator),
                              (void **) &_enumerator);

        if (FAILED(hr)) {
            error = AE_CO_CREATE_FAILED;
            break;
        }

        if (_is_default) {
            hr = _enumerator->GetDefaultAudioEndpoint(is_input ? eCapture : eRender,
                                                      is_input ? eCommunications : eConsole,
                                                      &_device);
        } else {
            hr = _enumerator->GetDevice(utils_string::utf8_unicode(_device_id).c_str(), &_device);
        }

        if (hr != S_OK) {
            error = AE_CO_GETENDPOINT_FAILED;
            break;
        }

        get_device_info(_device);

        hr = _device->Activate(__uuidof(IAudioClient), CLSCTX_ALL, NULL, (void **) &_capture_client);
        if (hr != S_OK) {
            error = AE_CO_ACTIVE_DEVICE_FAILED;
            break;
        }

        hr = _capture_client->GetMixFormat(&_wfex);
        if (hr != S_OK) {
            error = AE_CO_GET_FORMAT_FAILED;
            break;
        }

        init_format(_wfex);

        DWORD flags = AUDCLNT_STREAMFLAGS_EVENTCALLBACK;
        if (_is_input == false)
            flags |= AUDCLNT_STREAMFLAGS_LOOPBACK;

        hr = _capture_client->Initialize(AUDCLNT_SHAREMODE_SHARED,
                                         flags,
                                         REFTIMES_PER_SEC,
                                         0,
                                         _wfex,
                                         NULL);

        // AUDCLNT_E_BUFFER_SIZE_NOT_ALIGNED
        // https://docs.microsoft.com/en-us/windows/win32/api/audioclient/nf-audioclient-iaudioclient-initialize
        if (hr != S_OK) {
            error = AE_CO_AUDIOCLIENT_INIT_FAILED;
            break;
        }

        //For ouotput mode,ready event will not signal when there is nothing rendering
        //We run a render thread and render silent pcm data all time
        if (!_is_input) {
            error = init_render();
            if (error != AE_NO)
                break;
        }

        hr = _capture_client->GetBufferSize(&_capture_sample_count);
        if (hr != S_OK) {
            error = AE_CO_GET_VALUE_FAILED;
            break;
        }

        hr = _capture_client->GetService(__uuidof(IAudioCaptureClient), (void **) &_capture);
        if (hr != S_OK) {
            error = AE_CO_GET_CAPTURE_FAILED;
            break;
        }

        _ready_event = CreateEvent(NULL, FALSE, FALSE, NULL);
        if (!_ready_event) {
            error = AE_CO_CREATE_EVENT_FAILED;
            break;
        }

        _stop_event = CreateEvent(NULL, TRUE, FALSE, NULL);
        if (!_stop_event) {
            error = AE_CO_CREATE_EVENT_FAILED;
            break;
        }

        hr = _capture_client->SetEventHandle(_ready_event);
        if (hr != S_OK) {
            error = AE_CO_SET_EVENT_FAILED;
            break;
        }

        _inited = true;

    } while (0);

    if (error != AE_NO) {
        al_error("wasapi initialize failed,%s,error:%lu,hr:%lld",
                 err2str(error),
                 GetLastError(),
                 hr);
        clean_wasapi();
    }

    return error;
}

int record_audio_wasapi::start()
{
    if (_running == true) {
        al_warn("audio record is already running");
        return AE_NO;
    }

    if (_inited == false)
        return AE_NEED_INIT;

    HRESULT hr = S_OK;

    if (!_is_input) {
        hr = _render_client->Start();
        if (FAILED(hr)) {
            al_error("%s,error:%lu", err2str(AE_CO_START_FAILED), GetLastError());
            return AE_CO_START_FAILED;
        }
    }

    hr = _capture_client->Start();
    if (hr != S_OK) {
        al_error("%s,error:%lu", err2str(AE_CO_START_FAILED), GetLastError());
        return AE_CO_START_FAILED;
    }

    _start_time = av_gettime_relative();

    _running = true;

    if (!_is_input) {
        _render_thread = std::thread(std::bind(&record_audio_wasapi::render_loop, this));
    }

    _thread = std::thread(std::bind(&record_audio_wasapi::record_loop, this));

    return AE_NO;
}

int record_audio_wasapi::pause()
{
    _paused = true;
    return AE_NO;
}

int record_audio_wasapi::resume()
{
    _paused = false;
    return AE_NO;
}

int record_audio_wasapi::stop()
{
    _running = false;
    SetEvent(_stop_event);

    if (_render_thread.joinable())
        _render_thread.join();

    if (_thread.joinable())
        _thread.join();

    if (_capture_client)
        _capture_client->Stop();

    if (_render_client)
        _render_client->Stop();

    return AE_NO;
}

const AVRational record_audio_wasapi::get_time_base()
{
    if (_use_device_ts)
        return {1, NS_PER_SEC};
    else
        return {1, AV_TIME_BASE};
}

int64_t record_audio_wasapi::get_start_time()
{
    return _start_time;
}

void record_audio_wasapi::process_data(AVFrame *frame,
                                       uint8_t *data,
                                       uint32_t sample_count,
                                       uint64_t device_ts)
{
    int sample_size = _bit_per_sample / 8 * _channel_num;

    //wasapi time unit is 100ns,so time base is NS_PER_SEC
    frame->pts = _use_device_ts ? device_ts * 100 : av_gettime_relative();

    if (_use_device_ts == false) {
        frame->pts -= (int64_t) sample_count * NS_PER_SEC / (int64_t) _sample_rate / 100;
    }

    frame->pkt_dts = frame->pts;
    frame->nb_samples = sample_count;
    frame->format = _fmt;
    frame->sample_rate = _sample_rate;
    ffmpeg_set_frame_channels(frame, _channel_num);
    frame->pkt_size = sample_count * sample_size;

    av_samples_fill_arrays(frame->data, frame->linesize, data, _channel_num, sample_count, _fmt, 1);

    if (_on_data)
        _on_data(frame, _cb_extra_index);
}

int record_audio_wasapi::do_record(AVFrame *frame)
{
    HRESULT res = S_OK;
    LPBYTE buffer = NULL;
    DWORD flags = 0;
    uint32_t sample_count = 0;
    UINT64 pos, ts;
    int error = AE_NO;

    while (_running) {
        res = _capture->GetNextPacketSize(&sample_count);

        if (FAILED(res)) {
            if (res != AUDCLNT_E_DEVICE_INVALIDATED)
                al_error("GetNextPacketSize failed: %lX", res);
            error = AE_CO_GET_PACKET_FAILED;
            break;
        }

        if (!sample_count)
            break;

        buffer = NULL;
        res = _capture->GetBuffer(&buffer, &sample_count, &flags, &pos, &ts);
        if (FAILED(res)) {
            if (res != AUDCLNT_E_DEVICE_INVALIDATED)
                al_error("GetBuffer failed: %lX", res);
            error = AE_CO_GET_BUFFER_FAILED;
            break;
        }

        //input mode do not have silent data flag do nothing here
        if (flags & AUDCLNT_BUFFERFLAGS_SILENT) {
            //al_warn("on slient data %d", sample_count);
        }

        if (buffer) {
            process_data(frame, buffer, sample_count, ts);
        } else {
            al_error("buffer invalid is");
        }

        _capture->ReleaseBuffer(sample_count);
    }

    return error;
}

void record_audio_wasapi::render_loop()
{
    HANDLE events[2] = {_stop_event, _render_event};

    HRESULT res = S_OK;
    uint8_t *pData = NULL;
    uint32_t padding_count = 0;

    while (_running && WaitForMultipleObjects(2, events, FALSE, INFINITE) != WAIT_OBJECT_0) {
        res = _render_client->GetCurrentPadding(&padding_count);
        if (FAILED(res)) {
            break;
        }

        if (padding_count == _render_sample_count) {
            if (_on_error)
                _on_error(AE_CO_PADDING_UNEXPECTED, _cb_extra_index);
            break;
        }

        res = _render->GetBuffer(_render_sample_count - padding_count, &pData);
        if (FAILED(res)) {
            if (_on_error)
                _on_error(AE_CO_GET_BUFFER_FAILED, _cb_extra_index);
            break;
        }

        res = _render->ReleaseBuffer(_render_sample_count - padding_count,
                                     AUDCLNT_BUFFERFLAGS_SILENT);
        if (FAILED(res)) {
            if (_on_error)
                _on_error(AE_CO_RELEASE_BUFFER_FAILED, _cb_extra_index);
            break;
        }
    }
}

void record_audio_wasapi::record_loop()
{
    AVFrame *frame = av_frame_alloc();

    HANDLE events[2] = {_stop_event, _ready_event};

    // while,sys will never not signal this ready_event in windows7,
    // and only signal when something is rendring,so we just wait 10ms for speaker
    DWORD dur = _is_input ? INFINITE : 10;

    int error = AE_NO;
    while (_running) {
        if (WaitForMultipleObjects(2, events, FALSE, dur) == WAIT_OBJECT_0)
            break;

        if ((error = do_record(frame)) != AE_NO) {
            if (_on_error)
                _on_error(error, _cb_extra_index);
            break;
        }
    } //while(_running)

    av_frame_free(&frame);
}

void record_audio_wasapi::clean_wasapi()
{
    if (_wfex)
        CoTaskMemFree(_wfex);
    _wfex = NULL;

    if (_enumerator)
        _enumerator->Release();
    _enumerator = nullptr;

    if (_device)
        _device->Release();
    _device = nullptr;

    if (_capture_client)
        _capture_client->Release();
    _capture_client = nullptr;

    if (_render_client)
        _render_client->Release();
    _render_client = nullptr;

    if (_capture)
        _capture->Release();
    _capture = nullptr;

    if (_render)
        _render->Release();
    _render = nullptr;

    if (_ready_event)
        CloseHandle(_ready_event);
    _ready_event = NULL;

    if (_stop_event)
        CloseHandle(_stop_event);
    _stop_event = NULL;

    if (_render_event)
        CloseHandle(_render_event);
    _render_event = NULL;

    if (_co_inited == true)
        CoUninitialize();

    _co_inited = false;
    _inited = false;
}
} // namespace am