How can I get internet mp3/audio and record to wav file?

[hash6iron]

Hi @pschatzmann.

I´m trying to write data from URL which I´m listening it, to a WAV file, but only noise is recorded. I understand that the data is MP3 coded then this is the reason because the audio is recorded as noise.

It is possible to do it easly?

See below a fragment of my sketch. Thanks in advace.

          // Here internet radio is read.
          size_t bytesRead = urlStream.readBytes(tempBuffer, sizeof(tempBuffer));
          
          if (bytesRead > 0) 
          {
              // write to output (mp3 decoder -> eq -> kitstream)
              decodedStream.write(tempBuffer, bytesRead);                          
              
              // If REC is active then write to WAv file too
              if (REC)
              {
                // Write to file too.
                encoderOutWAV.write(tempBuffer, bytesRead);
              }
             ...
          }
         ...

[pschatzmann]

I think you just forgot to run the mp3 data thru an mp3 decoder to get PCM data...
So start you output chain with an EncodedAudioStream with a mp3 decoder ...

[hash6iron]

Hi @pschatzmann ,

Yes, decodedStream is my EncodedAudioStream for mp3 with MP3DecoderHelix. I understand that when I do write to decodedStrem the URL mp3 stream is being decoded to kitStream? I need an additional EncodedAudioStream?

I listen the radio streaming audio without problems but not to wav recording.

[pschatzmann]

What is your current processing chain ?
I would suggest something like URLStream -copy> EncodedAudioOutput(MP3Decoder) -> EncodedAudioOutput(WAVEncoder) -> File

[hash6iron]

Currently.

URLStream -> EncodedAudioStream (MP3DecodeHelix) -> EQ -> kitStream

Directly with write and read function to/from buffer.