Question

有人可以提供示例代码，说明如何在一个Performance中，一个MusicPort，加载和播放两个midis（midi 1中的频道0-15并使用另一个频道组播放midi 2＆0 39的？）我尝试过在音乐端口上分配PChannelBlock并在分段上设置SetPChannel，但它只播放第一个midi片刻，之后才播放第二个。我找不到任何例子，而且不幸的是我不能为我工作。

基本上在我的测试中我做了（某些步骤被跳过，但是默认）

端口是Microsoft Synthesizer

HRESULT hr = S_OK;
DMUS_PORTPARAMS portParams;

ZeroMemory(&portParams, sizeof(DMUS_PORTPARAMS));
portParams.dwSize = sizeof(DMUS_PORTPARAMS);
portParams.dwChannelGroups = 2;
portParams.dwValidParams = DMUS_PORTPARAMS_CHANNELGROUPS;   

if (midiPort.dwFlags & DMUS_PC_AUDIOPATH)
    portParams.dwFeatures = DMUS_PORT_FEATURE_AUDIOPATH;

portParams.dwEffectFlags = DMUS_EFFECT_REVERB;

if (FAILED(hr = mMusic8->CreatePort(midiPort.guidPort, &portParams, &mMusicPort, NULL)))
    return hr;

...

if (FAILED(hr = mPerformance->AddPort(mMusicPort)))
    return hr;

if (FAILED(hr = mPerformance->AssignPChannelBlock(0, mMusicPort, 1)))
    return hr;

if (FAILED(hr = mPerformance->AssignPChannelBlock(1, mMusicPort, 2)))
    return hr;

...

// chan1 is DWORD array 0 to 0xF
mSegment1->SetPChannelsUsed(0x10, chan1);

// chan2 is DWORD array 10 to 0x1F
mSegment2->SetPChannelsUsed(0x10, chan2);

if (FAILED(hr = mSegment1->SetParam(GUID_StandardMIDIFile, 0xFFFFFFFF, 0, 0, NULL)))
    return hr;

if (FAILED(hr = mSegment1->Download(mPerformance)))
    return hr;


if (FAILED(hr = mSegment2->SetParam(GUID_StandardMIDIFile, 0xFFFFFFFF, 0, 0, NULL)))
    return hr;

if (FAILED(hr = mSegment2->Download(mPerformance)))
    return hr;

...

if (FAILED(hr = mPerformance->PlaySegment(mSegment1, 0, 0, &segmentState1)))
    return hr;

if (FAILED(hr = mPerformance->PlaySegment(mSegment2, 0, 0, &segmentState2)))
    return hr;

...

DirectMusic在2个通道组上同时播放两个MIdis

0 个答案: