NewTimePitch与混音器 [英] NewTimePitch with Mixer

问题描述

我使用的图形非常类似于Apple提供的示例应用程序。

I have a graph working that is very similar to the example app provided by Apple.

https://developer.apple.com/library/ios/samplecode/MixerHost/Listings/Classes_MixerHostAudio_m.html#//apple_ref/doc/uid/DTS40010210-Audios_MixerHost DontLinkElementID_6

我的mixerNode是由自定义数据（而不是吉他/节拍）提供的-但设置是相似的。两条总线在调音台上都是立体声的。

My mixerNode is being fed by custom data (rather than guitar/beats) - but the setup is similar. Both buses are stereo on the mixer.

我试图对内容进行时移，但到目前为止并没有成功。我尝试将kAudioUnitSubType_NewTimePitch添加到图形中，但是无论何时添加图形都无法创建。是否有任何源示例说明我如何使用混音器单元进行时移（移动所有总线）？

I am trying to time shift the content, but so far have been unsuccessful. I have tried adding a kAudioUnitSubType_NewTimePitch to the graph, but the graph fails to create whenever I add it. Is there any source example of how I might time shift with a mixer unit (shifting all buses)?

下面是一些工作代码：

// Describe audio component
AudioComponentDescription output_desc;
bzero(&output_desc, sizeof(output_desc));
output_desc.componentType = kAudioUnitType_Output;
output_desc.componentSubType = self.componentSubType;
output_desc.componentFlags = 0;
output_desc.componentFlagsMask = 0;
output_desc.componentManufacturer = kAudioUnitManufacturer_Apple;


// multichannel mixer unit
AudioComponentDescription mixer_desc;
bzero(&mixer_desc, sizeof(mixer_desc));
mixer_desc.componentType = kAudioUnitType_Mixer;
mixer_desc.componentSubType = kAudioUnitSubType_MultiChannelMixer;
mixer_desc.componentFlags = 0;
mixer_desc.componentFlagsMask = 0;
mixer_desc.componentManufacturer = kAudioUnitManufacturer_Apple;

// Describe NewTimePitch component
AudioComponentDescription speed_desc;
bzero(&speed_desc, sizeof(speed_desc));
speed_desc.componentType = kAudioUnitType_FormatConverter;
speed_desc.componentSubType = kAudioUnitSubType_NewTimePitch;
speed_desc.componentFlags = 0;
speed_desc.componentFlagsMask = 0;
speed_desc.componentManufacturer = kAudioUnitManufacturer_Apple;


result = AUGraphAddNode(mGraph, &output_desc, &outputNode);
if (result) { printf("AUGraphNewNode 1 result %ld %4.4s\n", (long)result, (char*)&result); return; }

result = AUGraphAddNode(mGraph, &speed_desc, &timeNode );
if (result) { printf("AUGraphNewNode 2 result %ld %4.4s\n", (long)result, (char*)&result); return; }

result = AUGraphAddNode(mGraph, &mixer_desc, &mixerNode );
if (result) { printf("AUGraphNewNode 3 result %ld %4.4s\n", (long)result, (char*)&result); return; }

result = AUGraphConnectNodeInput(mGraph, mixerNode, 0, outputNode, 0);
if (result) { printf("AUGraphConnectNodeInput mixer-> time result %ld %4.4s\n", (long)result, (char*)&result); return; }

// open the graph AudioUnits are open but not initialized (no resource allocation occurs here)

result = AUGraphOpen(mGraph);
if (result) { printf("AUGraphOpen result %ld %08lX %4.4s\n", (long)result, (long)result, (char*)&result); return; }

result = AUGraphNodeInfo(mGraph, mixerNode, NULL, &mMixer);
if (result) { printf("AUGraphNodeInfo mixer result %ld %08lX %4.4s\n", (long)result, (long)result, (char*)&result); return; }

result = AUGraphNodeInfo(mGraph, timeNode, NULL, &mTime);
if (result) { printf("AUGraphNodeInfo time result %ld %08lX %4.4s\n", (long)result, (long)result, (char*)&result); return; }

result = AUGraphNodeInfo(mGraph, outputNode, NULL, &mOutput);
if (result) { printf("AUGraphNodeInfo output result %ld %08lX %4.4s\n", (long)result, (long)result, (char*)&result); return; }


UInt32 numbuses = 1;

result = AudioUnitSetProperty(mMixer, kAudioUnitProperty_ElementCount, kAudioUnitScope_Input, 0, &numbuses, sizeof(numbuses));
if (result) { printf("AudioUnitSetProperty bus result %ld %08lX %4.4s\n", (long)result, (long)result, (char*)&result); return; }


for (int i = 0; i < numbuses; ++i) {
    // setup render callback struct
    AURenderCallbackStruct rcbs;
    rcbs.inputProc = &mixerInput;
    rcbs.inputProcRefCon = (__bridge void *)(outputStream);

    printf("set kAudioUnitProperty_SetRenderCallback for mixer input bus %d\n", i);

    // Set a callback for the specified node's specified input
    result = AUGraphSetNodeInputCallback(mGraph, mixerNode, i, &rcbs);
    // equivalent to AudioUnitSetProperty(mMixer, kAudioUnitProperty_SetRenderCallback, kAudioUnitScope_Input, i, &rcbs, sizeof(rcbs));
    if (result) { printf("AUGraphSetNodeInputCallback result %ld %08lX %4.4s\n", (long)result, (long)result, (char*)&result); return; }

    // set input stream format to what we want
    printf("set mixer input kAudioUnitProperty_StreamFormat for bus %d\n", i);

result = AudioUnitSetProperty(mMixer, kAudioUnitProperty_StreamFormat, kAudioUnitScope_Input, i, mAudioFormat.streamDescription, sizeof(AudioStreamBasicDescription));
    if (result) { printf("AudioUnitSetProperty result %ld %08lX %4.4s\n", (long)result, (long)result, (char*)&result); return; }
}

result = AudioUnitSetProperty(mMixer, kAudioUnitProperty_StreamFormat, kAudioUnitScope_Output, 0, &streamInAudioFormat, sizeof(streamInAudioFormat));
if (result) { printf("AudioUnitSetProperty mixer result %ld %08lX %4.4s\n", (long)result, (long)result, (char*)&result); return; }

result = AudioUnitSetProperty(mOutput, kAudioUnitProperty_StreamFormat, kAudioUnitScope_Output, 1, &streamInAudioFormat, sizeof(streamInAudioFormat));
if (result) { printf("AudioUnitSetProperty output result %ld %08lX %4.4s\n", (long)result, (long)result, (char*)&result); return; }

CAShow(mGraph);
// now that we've set everything up we can initialize the graph, this will also validate the connections
result = AUGraphInitialize(mGraph);
if (result) { printf("AUGraphInitialize result %ld %08lX %4.4s\n", (long)result, (long)result, (char*)&result); return; }

此代码有效-我有一个混合器，可以通过回调将数据泵入其中。您可以看到我创建了时间节点，但是无论我将其插入到图形中的哪个位置，它都会杀死它。我也不能设置流格式或其他格式。

This code works - I have a mixer that I can pump data into via the callback. You can see i have the time node created, but no matter where I insert it into the graph, it kills it. I can't set stream formats or anything else on it either.

理想情况下，我想做这样的事情：

Ideally i would want to do something like this:

result = AUGraphConnectNodeInput(mGraph, mixerNode, 0, timeNode, 0);
result = AUGraphConnectNodeInput(mGraph, timeNode, 0, outputNode, 0);

但这不起作用。

以下是该设置的输出：

AudioUnitGraph 0x385003:
  Member Nodes:
    node 1: 'auou' 'vpio' 'appl', instance 0x134f40b10 O  
    node 2: 'aufc' 'nutp' 'appl', instance 0x134e733b0 O  
    node 3: 'aumx' 'mcmx' 'appl', instance 0x134ea71d0 O  
  Connections:
    node   3 bus   0 => node   2 bus   0  [ 2 ch,  44100 Hz, 'lpcm' (0x00000029) 32-bit little-endian float, deinterleaved]
    node   2 bus   0 => node   1 bus   0  [ 1 ch,      0 Hz, 'lpcm' (0x00000029) 32-bit little-endian float, deinterleaved]
  Input Callbacks:
    {0x100038ea0, 0x134f7f900} => node   3 bus   0  [2 ch, 44100 Hz]
  CurrentState:
    mLastUpdateError=0, eventsToProcess=F, isInitialized=F, isRunning=F
2016-01-07 23:21:32.230 R5ProTestbed[901:503908] 23:21:32.229 ERROR:    [0x19ff25000] 2776: ConnectAudioUnit failed with error -10868
2016-01-07 23:21:32.230 R5ProTestbed[901:503908] 23:21:32.230 ERROR:    [0x19ff25000] 1682: Initialize failed with error -10868

推荐答案

hotpaw2在我自己弄清楚后立即回答。非常感谢。我在混音器和IO的输出上设置了StreamFormat，通过停止它，转换器可以运行。

hotpaw2 answered right after I figured it out myself. Thanks so much. I was setting the StreamFormat on the outputs of the mixer and IO, by stopping that, the converter was able to function.

//    result = AudioUnitSetProperty(mMixer, kAudioUnitProperty_StreamFormat, kAudioUnitScope_Output, 0, &streamInAudioFormat, sizeof(streamInAudioFormat));
//    if (result) { printf("AudioUnitSetProperty mixer result %ld %08lX %4.4s\n", (long)result, (long)result, (char*)&result); return; }

//    result = AudioUnitSetProperty(mOutput, kAudioUnitProperty_StreamFormat, kAudioUnitScope_Output, 1, &streamInAudioFormat, sizeof(streamInAudioFormat));
//    if (result) { printf("AudioUnitSetProperty output result %ld %08lX %4.4s\n", (long)result, (long)result, (char*)&result); return; }

这篇关于NewTimePitch与混音器的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！