Wav File Sink

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 3.9.0.0 and later):

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

Parameters

(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)·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

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

Source Files

C++ files

TODO

Header files

TODO

Public header files

TODO

Block definition

TODO