通过 DirectShow 播放 FLAC

如何解决通过 DirectShow 播放 FLAC

我想写一个简单的（只有一个 exe）音乐播放器。 如果我想播放 mp3，播放器可以工作，但如果我想使用 MadFLAC 过滤器，则播放器不起作用。 我无法连接 MadFLAC 引脚。始终删除 0x80040207 错误。 （我认为，MadFLAC 过滤器已正确加载，我可以毫无错误地添加到 GraphBuilder 并在 EnumFilters 中查看。）

我不坚持使用 MadFLAC。我对所有其他选项感兴趣，我可以通过 DirectShow 播放 FLAC 文件，而无需将编解码器包安装到客户端 PC。

这是我的简化代码：

#include <windows.h>
#include <strmif.h>
#include <control.h>
#include <uuids.h>
#pragma comment(lib,"strmiids.lib")

IPin* GetPin(IBaseFilter *bFilter,PIN_DIRECTION pindir)
{
    IEnumPins *EnumPin;
    bFilter->EnumPins(&EnumPin);
    unsigned long int num;
    IPin *TempPin = NULL;
    do {
        EnumPin->Next(1,&TempPin,&num);
        if (num != 0)
        {
            PIN_INFO PinInfo;
            TempPin->QueryPinInfo(&PinInfo);
            if (PinInfo.dir == pindir) break;
        }
    } while (num != 0);
    return TempPin;
}

typedef HRESULT __stdcall DLLGETCLASSOBJECT(REFCLSID rclsid,REFIID riid,void **ppv);
HRESULT CreateFilterFromFile(HINSTANCE hLibInst,GUID TGUID,void **Filter) {
    IClassFactory * ClassFactory;
    HRESULT Result = S_FALSE;
    FARPROC func;
    func = GetProcAddress(hLibInst,"DllGetClassObject");
    if (func != NULL)
    {
        IClassFactory *classFactory;
        DLLGETCLASSOBJECT *dllGetClassObject = (DLLGETCLASSOBJECT*)func;
        Result = dllGetClassObject(TGUID,IID_IClassFactory,(void**)&classFactory);
        if (SUCCEEDED(Result))
        {
            Result = classFactory->CreateInstance(NULL,IID_IBaseFilter,Filter);
            classFactory->Release();
        }
    }
    return Result;
}

LRESULT CALLBACK WndProc(HWND hwnd,UINT msg,WPARAM wParam,LPARAM lParam)
{
    switch (msg)
    {
    case WM_CLOSE:
        DestroyWindow(hwnd);
        break;
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
    default:
        return DefWindowProc(hwnd,msg,wParam,lParam);
    }
    return 0;
}

void Player(bool isFlac) {
    IGraphBuilder * player;
    IMediaControl * mcontrol;
    CoCreateInstance(CLSID_FilterGraph,NULL,CLSCTX_INPROC_SERVER,IID_IGraphBuilder,(void **)&player);
    player->QueryInterface(IID_IMediaControl,(void **)&mcontrol);
    IBaseFilter *ARS = NULL;
    HRESULT hr = CoCreateInstance(CLSID_AsyncReader,(void **)&ARS);
    IBaseFilter * AudioDecoderFilter = NULL;
    if (isFlac) {
        hr = player->AddSourceFilter(L"D:\\test.flac",L"Async Reader Source",&ARS);
        GUID CLSID_MadFlacAudioDecoder;
        CLSIDFromString(L"{6B257121-CBB6-46B3-ABFA-B14DFA98C4A6}",&CLSID_MadFlacAudioDecoder);
        HINSTANCE FHMPCAudioFilterInst = CoLoadLibrary(L"d:\\_MadFlac\\madFlac.ax",true);
        if (FHMPCAudioFilterInst != 0) {
            hr = CreateFilterFromFile(FHMPCAudioFilterInst,CLSID_MadFlacAudioDecoder,(void **)&AudioDecoderFilter);
            if (AudioDecoderFilter != NULL) {
                player->AddFilter(AudioDecoderFilter,L"MadFLAC Audio decoder (internal)");
            }
        }
    }
    else {
        hr = player->AddSourceFilter(L"D:\\test.mp3",&ARS);
        hr = CoCreateInstance(CLSID_MPEG1Splitter,(void **)&AudioDecoderFilter);
        hr = player->AddFilter(AudioDecoderFilter,L"MPEG1Splitter");
    }

    IBaseFilter *PCM = NULL;
    hr = CoCreateInstance(CLSID_ACMWrapper,(void **)&PCM);
    hr = player->AddFilter(PCM,L"PCM");

    IBaseFilter *DSE = NULL;
    hr = CoCreateInstance(CLSID_DSoundRender,(void **)&DSE);
    hr = player->AddFilter(DSE,L"Direct Renderer");

    //ARS -> AdioDecoder
    hr = GetPin(ARS,PINDIR_OUTPUT)->Connect(GetPin(AudioDecoderFilter,PINDIR_INPUT),NULL);
    //If I use MadFLAC filter this hresult is 0x80040207 
    if (FAILED(hr)) MessageBoxA(NULL,"There is no common media type between these pins.","Error",NULL);
    //AudioDecoderFilter -> PCM
    hr = GetPin(AudioDecoderFilter,PINDIR_OUTPUT)->Connect(GetPin(PCM,NULL);
    //PCM -> DSE
    hr = GetPin(PCM,PINDIR_OUTPUT)->Connect(GetPin(DSE,NULL);
    //ListGraph(player);
    mcontrol->Run();
}


int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,LPSTR lpCmdLine,int nCmdShow)
{
    WNDCLASSEX wc;
    HWND hwnd;
    MSG Msg;
    wc.cbSize = sizeof(WNDCLASSEX);
    wc.style = 0;
    wc.lpfnWndProc = WndProc;
    wc.cbClsExtra = 0;
    wc.cbWndExtra = 0;
    wc.hInstance = hInstance;
    wc.hIcon = LoadIcon(NULL,IDI_APPLICATION);
    wc.hCursor = LoadCursor(NULL,IDC_ARROW);
    wc.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);
    wc.lpszMenuName = NULL;
    wc.lpszClassName = "Teszt";
    wc.hIconSm = LoadIcon(NULL,IDI_APPLICATION);

    if (!RegisterClassEx(&wc)) { MessageBox(NULL,"Window Registration Failed!","Error!",MB_ICONEXCLAMATION | MB_OK); return 0; }
    hwnd = CreateWindowEx(WS_EX_CLIENTEDGE,"Teszt","AppName",WS_OVERLAPPED | WS_CAPTION | WS_SYSMENU,CW_USEDEFAULT,460,240,hInstance,NULL);
    if (hwnd == NULL) { MessageBox(NULL,"Window Creation Failed!",MB_ICONEXCLAMATION | MB_OK); return 0; }
    ShowWindow(hwnd,nCmdShow);
    UpdateWindow(hwnd);

    Player(false);

    while (GetMessage(&Msg,0) > 0)
    {
        TranslateMessage(&Msg);
        DispatchMessage(&Msg);
    }
    return Msg.wParam;
}

我使用 VS2015，原生 C++。

我也会尝试使用 LibFLAC，但我已经被困在那里无法构建，因为它抛出了数百个错误，我最终减少到不到 20 个，但几个小时后我已经放弃了痛苦。

https://github.com/xiph/flac

https://ftp.osuosl.org/pub/xiph/releases/oggdsf/

解决方法

Windows 未附带用于 DirectShow 的 FLAC 解码器。因此，通过 DirectShow 播放 FLAC 音频需要第三方解码器。如果您不想回复编解码器包，则需要将某些 FLAC 解码器与 DirectShow 接口捆绑在一起，或者在代码中实现解码器。 https://xiph.org/dshow 对我来说似乎是最好的第三方解码器选项，在 FLAC 库上实现 DirectShow 过滤器需要一些开发工作，这对于相关任务来说可能是一种矫枉过正。