Avfoundation 如何获得采样率&;CMAudioFormatDescription上每个通道的位
我可以从AVCaptureDeviceFormat获取音频描述Avfoundation 如何获得采样率&;CMAudioFormatDescription上每个通道的位,avfoundation,core-audio,avcapturedevice,Avfoundation,Core Audio,Avcapturedevice,我可以从AVCaptureDeviceFormat获取音频描述 let formats = device.formats for format in formats { print(format.formatDescription) } 但希望直接访问mSampleRate和mBitsPerChannel属性 CMAudioFormatDescription 0x60000010b880 [0x7fffadb29d80] { mediaType:'soun' mediaSu
let formats = device.formats
for format in formats {
print(format.formatDescription)
}
但希望直接访问mSampleRate和mBitsPerChannel属性
CMAudioFormatDescription 0x60000010b880 [0x7fffadb29d80] {
mediaType:'soun'
mediaSubType:'lpcm'
mediaSpecific: {
ASBD: {
mSampleRate: 44100.000000
mFormatID: 'lpcm'
mFormatFlags: 0x9
mBytesPerPacket: 8
mFramesPerPacket: 1
mBytesPerFrame: 8
mChannelsPerFrame: 2
mBitsPerChannel: 32 }
cookie: {(null)}
ACL: {Stereo (L R)}
FormatList Array: {(null)}
}
extensions: {(null)}
}
我该怎么办?
我一直在研究AudioToolBox框架中的AudioFormatGetProperty(),但是我迷路了。
非常感谢您的帮助。您可以从格式说明中获取
AudioStreamBasicDescription
,并从中获取所需的数据:
let asbd = CMAudioFormatDescriptionGetStreamBasicDescription(format.formatDescription)
if let asbd = asbd?.pointee {
print("Sample rate: \(asbd.mSampleRate), bits per channel: \(asbd.mBitsPerChannel)")
}