Wav File Sink

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Write stream to a Microsoft PCM (pulse code modulated) (.wav) file (all versions of GNU Radio) and some other file formats that libsndfile supports (GNU Radio and later):

Values must be floats within [-1;1].


(R): Run-time adjustable

File (R)
Path to the file to write to
N Channels
Number of audio channels
Sample Rate
Sample rate of the recording
Output Format (GNU Radio 3.9 and later)
choice of possible container/audio formats:
  • WAV (old-school windows RIFF sound files)
  • FLAC (lossless audio codec – probably a good choice for storage of actual audio data)
  • Ogg file (Container for lossy compression – allows for choice of vorbis, or OPUS, as audio codec. Prefer OPUS. Very good quality.)
  • 64-bit WAV (RF64, used in broadcasting standards, to support massive multichannel files, and files > 4 GB)
Bits per Samples (only WAV, FLAC, 64-bit WAV)
Bit-depth of the recording.
Rule of thumb: you don't need more than 2 + (audio SNR in dB)·2 bits of integer bitdepth to keep quantization noise below signal noise.
"Float" always suffices, but is wasteful on size, if you're using "Double" without having written down a calculation why, you're doing it wrong

Example Flowgraph

Mic to OPUS.png

Non-GUI flow graph. Records a microphone to an OPUS-compressed .ogg file. Very handy.

Source Files

C++ files
Header files
Public header files
Block definition