将RtAudio与核心音频一起使用时，probeDeviceOpen功能失败

Question

我正在尝试写一个C++程序，播放实时处理的音频。我已经决定使用RtAudio，但是不能让测试程序播放音频。

我使用的是Mac，所以我使用./configure --with-core和make进行编译。编译完测试目录中的文件后，我运行./audioprobe返回此列表。

Compiled APIs:
  OS-X Core Audio

Current API: OS-X Core Audio

Found 3 device(s) ...

Device Name = Apple Inc.: Built-in Microphone
Probe Status = Successful
Output Channels = 0
Input Channels = 2
Duplex Channels = 0
This is NOT the default output device.
This is NOT the default input device.
Natively supported data formats:
  32-bit float
Supported sample rates = 44100 48000 88200 96000 

Device Name = Apple Inc.: Built-in Input
Probe Status = Successful
Output Channels = 0
Input Channels = 2
Duplex Channels = 0
This is NOT the default output device.
This is the default input device.
Natively supported data formats:
  32-bit float
Supported sample rates = 44100 48000 88200 96000 

Device Name = Apple Inc.: Built-in Output
Probe Status = Successful
Output Channels = 2
Input Channels = 0
Duplex Channels = 0
This is the default output device.
This is NOT the default input device.
Natively supported data formats:
  32-bit float
Supported sample rates = 44100 48000 88200 96000 

由于内置输出设备是索引2，因此我随后运行了./playsaw 2 44100 2，但出现了一个错误：

RtApiCore::probeDeviceOpen: system error (kAudioHardwareUnknownPropertyError)
    getting stream format for device (2).

如何解决这个问题？

Answer 1

你用的是Lion (10.7)吗？我看到了同样的问题，在较老的系统(10.6.x)上，RtAudio对我来说工作得很好。

也许你可以降级到RtAudio 4.0.6，这对我在Lion上是有效的，但仍然潜伏着一个关于设备名称的bug，在4.0.8中得到了修复。