如何解决我在记录时崩溃了：“所需条件为假：format.sampleRate == hwFormat.sampleRate” afterweb rtc 调用
我的记录工作正常，但问题是在调用 WebRTC 后，我崩溃了
所需条件为假：format.sampleRate == hwFormat.sampleRate
这是我如何开始崩溃和 installTap：
func startRecord() {
self.filePath = nil
print("last format: \(audioEngine.inputNode.inputFormat(forBus: 0).sampleRate)")
let session = AVAudioSession.sharedInstance()
do {
try session.setCategory(.playAndRecord,options: .mixWithOthers)
} catch {
print("======== Error setting setCategory \(error.localizedDescription)")
}
do {
try session.setPreferredSampleRate(44100.0)
} catch {
print("======== Error setting rate \(error.localizedDescription)")
}
do {
try session.setPreferredioBufferDuration(0.005)
} catch {
print("======== Error IOBufferDuration \(error.localizedDescription)")
}
do {
try session.setActive(true,options: .notifyOthersOnDeactivation)
} catch {
print("========== Error starting session \(error.localizedDescription)")
}
let format = AVAudioFormat(commonFormat: AVAudioCommonFormat.pcmFormatInt16,sampleRate: 44100.0,// sampleRate: audioEngine.inputNode.inputFormat(forBus: 0).sampleRate,channels: 1,interleaved: true)
audioEngine.connect(audioEngine.inputNode,to: mixer,format: format)
audioEngine.connect(mixer,to: audioEngine.mainmixerNode,format: format)
let dir = NSSearchPathForDirectoriesInDomains(.documentDirectory,.userDomainMask,true).first! as String
filePath = dir.appending("/\(UUID.init().uuidString).wav")
_ = ExtAudioFileCreateWithURL(URL(fileURLWithPath: filePath!) as CFURL,kAudioFileWAVEType,(format?.streamDescription)!,nil,AudioFileFlags.eraseFile.rawValue,&outref)
mixer.installTap(onBus: 0,bufferSize: AVAudioFrameCount((format?.sampleRate)!),format: format,block: { (buffer: AVAudioPCMBuffer!,time: AVAudioTime!) -> Void in
let audioBuffer : AVAudioBuffer = buffer
_ = ExtAudioFileWrite(self.outref!,buffer.frameLength,audioBuffer.audiobufferlist)
})
try! audioEngine.start()
startMP3Rec(path: filePath!,rate: 128)
}
func stopRecord() {
self.audioFilePlayer.stop()
self.audioEngine.stop()
self.mixer.removeTap(onBus: 0)
self.stopMP3Rec()
ExtAudioFiledispose(self.outref!)
try? AVAudioSession.sharedInstance().setActive(false)
}
func startMP3Rec(path: String,rate: Int32) {
self.isMP3Active = true
var total = 0
var read = 0
var write: Int32 = 0
let mp3path = path.replacingOccurrences(of: "wav",with: "mp3")
var pcm: UnsafeMutablePointer<FILE> = fopen(path,"rb")
fseek(pcm,4*1024,SEEK_CUR)
let mp3: UnsafeMutablePointer<FILE> = fopen(mp3path,"wb")
let PCM_SIZE: Int = 8192
let MP3_SIZE: Int32 = 8192
let pcmbuffer = UnsafeMutablePointer<Int16>.allocate(capacity: Int(PCM_SIZE*2))
let mp3buffer = UnsafeMutablePointer<UInt8>.allocate(capacity: Int(MP3_SIZE))
let lame = lame_init()
lame_set_num_channels(lame,1)
lame_set_mode(lame,MONO)
lame_set_in_samplerate(lame,44100)
lame_set_brate(lame,rate)
lame_set_VBR(lame,vbr_off)
lame_init_params(lame)
dispatchQueue.global(qos: .default).async {
while true {
pcm = fopen(path,"rb")
fseek(pcm,4*1024 + total,SEEK_CUR)
read = fread(pcmbuffer,MemoryLayout<Int16>.size,PCM_SIZE,pcm)
if read != 0 {
write = lame_encode_buffer(lame,pcmbuffer,Int32(read),mp3buffer,MP3_SIZE)
fwrite(mp3buffer,Int(write),1,mp3)
total += read * MemoryLayout<Int16>.size
fclose(pcm)
} else if !self.isMP3Active {
_ = lame_encode_flush(lame,MP3_SIZE)
_ = fwrite(mp3buffer,mp3)
break
} else {
fclose(pcm)
usleep(50)
}
}
lame_close(lame)
fclose(mp3)
fclose(pcm)
self.filePathMP3 = mp3path
}
}
func stopMP3Rec() {
self.isMP3Active = false
}
作为第一次运行应用程序，我使用
记录最后一种格式print("last format: \(audioEngine.inputNode.inputFormat(forBus: 0).sampleRate)")
--> 返回 0 -> 正常记录 下次返回 44100 -> 正常记录
但是在调用 webrtc 之后，我得到了 48000，然后它在这一行崩溃了
self.audioEngine.connect(self.audioEngine.inputNode,to: self.mixer,format: format)
我在 stackoverflow 上花了 4 个小时，但没有解决方案对我有用。
我不想要 48000 格式，因为我已经将样本设置为
sampleRate: audioEngine.inputNode.inputFormat(forBus: 0).sampleRate,-> 我的输出很难听到，我能认出我的声音 :(
所以我认为 44100 是最好的
有人能给我一些建议吗？谢谢
解决方法
这条线有问题。
let format = AVAudioFormat(commonFormat: AVAudioCommonFormat.pcmFormatInt16,...
AVAudioCommonFormat.pcmFormatInt16 在默认情况下不起作用。
您应该使用 .pcmFormatFloat32
xcode 提示很明显，
崩溃线
self.audioEngine.connect(self.audioEngine.inputNode,to: self.mixer,format: format)
打印 mixer.inputFormat(forBus: 0 )
然后你得到了实际设备的采样率 48000。你可以通过转换得到44100
只需使用 AVAudioConverter 来做下采样音频缓冲。
let input = engine.inputNode
let bus = 0
let inputFormat = input.outputFormat(forBus: bus )
guard let outputFormat = AVAudioFormat(commonFormat: .pcmFormatFloat32,sampleRate: 44100,channels: 1,interleaved: true),let converter = AVAudioConverter(from: inputFormat,to: outputFormat) else{
return
}
if let convertedBuffer = AVAudioPCMBuffer(pcmFormat: outputFormat,frameCapacity: AVAudioFrameCount(outputFormat.sampleRate) * buffer.frameLength / AVAudioFrameCount(buffer.format.sampleRate)){
var error: NSError?
let status = converter.convert(to: convertedBuffer,error: &error,withInputFrom: inputCallback)
assert(status != .error)
print(convertedBuffer.format)
}
下样部分，让您的案例更加生动。
let bus = 0
let inputNode = audioEngine.inputNode
let inputFormat = inputNode.outputFormat(forBus: bus)
let outputFormat = AVAudioFormat(commonFormat: .pcmFormatFloat32,interleaved: true)!
let converter = AVAudioConverter(from: inputFormat,to: outputFormat)!
inputNode.installTap(onBus: bus,bufferSize: 1024,format: inputFormat){ (buffer: AVAudioPCMBuffer,when: AVAudioTime) in
var newBufferAvailable = true
let inputCallback: AVAudioConverterInputBlock = { inNumPackets,outStatus in
if newBufferAvailable {
outStatus.pointee = .haveData
newBufferAvailable = false
return buffer
} else {
outStatus.pointee = .noDataNow
return nil
}
}
let convertedBuffer = AVAudioPCMBuffer(pcmFormat: outputFormat,frameCapacity: AVAudioFrameCount(outputFormat.sampleRate) * buffer.frameLength / AVAudioFrameCount(buffer.format.sampleRate))!
var error: NSError?
let status = converter.convert(to: convertedBuffer,withInputFrom: inputCallback)
// 44100 Hz buffer
print(convertedBuffer.format)
}
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