When AudioKitStream channels (MONO / STEREO) is change, the sound appears SLOW DOWN.

[hash6iron]

I try to change the following characteristics of a WAV stream playing, on run time (using player object)

• Bits per sample
• Channels (1 or 2 for MONO or STEREO)
• Sampling rate

All appears work fine, but if I change channels from 2 to 1, the sound appears to slow down. I was waiting for a stereo lost but not a slow down sound. Is it normal functionality?

This is my part of code where I change these parameters on playing time.

cfg.bits_per_sample = WAV_BITS_PER_SAMPLE;
cfg.channels = WAV_CHAN;
cfg.sample_rate = WAV_SAMPLING_RATE;

kit.begin(cfg);

Thanks in advance.

[pschatzmann]

AudioKitStream is obsolete, please use the new documented functionality!

If you want to change the data format on the fly, please read the corresonding Wiki

[hash6iron]

How Can I applied the example to player object? Now my WAV player is very complex, uses

    I2SCodecStream kit;
    WAVDecoder decoder;
    AudioInfo from(44100, 2, 16);                                           
    AudioInfo to(WAV_SAMPLING_RATE, WAV_CHAN, WAV_BITS_PER_SAMPLE); 
    AudioPlayer player(source,kit,decoder);
    FormatConverterStream conv(kit);

    conv.begin(from,to);   

But, how Can I out the converted signal to player output?

[hash6iron]

Hi again.

Appears works fine, but I think know what happen, I think that audiokit is slowing down due to high processing. Is there any way to improve the audio processing when format converter is working dynamically, on the fly?

[hash6iron]

@pschatzmann , here I put a WAV file that you can see the conversion from STEREO to MONO. Doesn't work fine.

test_mono.zip

[pschatzmann]

I don't think this is an issue with the FormatConverter but rather something else slowing down the audio output. Did you set the log level to Warning ?
In your example, you don't really show what you are doing since I dont know what your constant values are.
If you just want to change the number of channels, it is a bit more efficient just to use the ChannelFormatConverterStream instead.

I suggest that you make a small test sketch with just this function.

[hash6iron]

Hello @pschatzmann ,

Tonight achieve applie FormatConverter to the output (at I2S board) but mono/stereo doesn't applie correctly, is the same effect to change bits_per_sample, channels and sampling rate directly over player configuration, then probably I don't know how applie FormatConverter to the WAV player from SD card. I try to read for hours the examples and wiki but the library is very extended and I haven't achieved the correct code.

Could you help me?

Thanks for all.

[pschatzmann]

Did you try to make a small reproducible test sketch ?

The WAV informs the AudioPlayer about the current format, this informs the FormatConverter.
The FormatConverter then applies the necessary changes which have been defined as target, and reconfigures I2S if necessary.

You can set the log level to see in detail what's going on,,,