How to change sample rate

[soulfly]

Hi, could you explain how to change current sample rate?

Lines
inputFormat.mSampleRate = 44100.0;
outputFormat.mSampleRate = 44100.0;

dont affect to this

thanks

[soulfly]

already implemented
https://github.com/soulfly/novocaine/commit/b4ce807c110c4f1b68e355a26a0617c9882c100c
hope this help to other

[partho-maple]

I am working on an iOS audio processing app where i would like to use novocaine project. But i need to change the default input and output audio settings. The settings is(may be, but i am not sure.)...

inputFormat.mSampleRate = 44100.0;
outputFormat.mSampleRate = 44100.0;
mBitsPerChannel = 32;
mBytesPerSample = 4
mNumberOfChannels = 2

But i need to change the input and output audio settings to the following...

inputAudioStream.mSampleRate = 8000.0;
inputAudioStream.mFormatID = kAudioFormatLinearPCM;
inputAudioStream.mBitsPerChannel = 16;
inputAudioStream.mBytesPerFrame = 2;
inputAudioStream.mChannelsPerFrame = 1;
inputAudioStream.mFramesPerPacket = 1;
inputAudioStream.mReserved = 0;

outputAudioStream.mSampleRate = 8000.0;
outputAudioStream.mFormatID = kAudioFormatLinearPCM;
outputAudioStream.mBitsPerChannel = 16;
outputAudioStream.mBytesPerFrame = 2;
outputAudioStream.mChannelsPerFrame = 1;
outputAudioStream.mFramesPerPacket = 1;
outputAudioStream.mReserved = 0;
Can you please suggest me that from where and how i will be able to do this ? Any sample code would be very help full.

Thanks in advance for your help and time.

[partho-maple]

@soulfly Would you please answer this question ? I would be very grateful if you do that.
Thanks.

[soulfly]

Please check my fork
https://github.com/soulfly/novocaine/commit/b4ce807c110c4f1b68e355a26a0617c9882c100c

I use 8000 sample rate

[partho-maple]

@soulfly I have checked it and already implemented it successfully. But i couldn't change the settings. Can you please advise me that how can i change the other settings ?

[soulfly]

Which other settings do you need to change? Not sure exactly what you mean

[partho-maple]

@soulfly You have described how to change mSampleRate to 8000Hz of AudioStreamBasicDescription for both input and output.

But i also need to change mFormatID, mBitsPerChannel, mBytesPerFrame, mChannelsPerFrame, mFramesPerPacket, mReserved of AudioStreamBasicDescription for both input and output. Actually i want to change the current settings to the following for both input and output...

mFormatID = kAudioFormatLinearPCM;
mBitsPerChannel = 16;
mBytesPerFrame = 2;
mChannelsPerFrame = 1;
mFramesPerPacket = 1;
mReserved = 0;

I badly need this. Please help me with this. And feel free to ask me any question.

Thank you very much for your help.