Wav File Sink: Difference between revisions

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[[Category:Block Docs]]
[[Category:Block Docs]]
Write stream to a Microsoft PCM (.wav) file.
Write stream to a Microsoft PCM (pulse code modulated) (.wav) file (all versions of GNU Radio) and some other file formats that [http://libsndfile.github.io/libsndfile/formats.html ''libsndfile''] supports (GNU Radio 3.9.0.0 and later):


Values must be floats within [-1;1]. Check gr_make_wavfile_sink() for extra info.
Values must be floats within [-1;1].


== Parameters ==
== Parameters ==
Line 16: Line 16:
: Sample rate of the recording
: Sample rate of the recording


; Bits per Samples
; Output Format (GNU Radio 3.9 and later)
: Precision of the recording
: 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 ([https://en.wikipedia.org/wiki/RF64 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 ==
== Example Flowgraph ==


Insert description of flowgraph here, then show a screenshot of the flowgraph and the output if there is an interesting GUI. Currently we have no standard method of uploading the actual flowgraph to the wiki or git repo, unfortunately. The plan is to have an example flowgraph showing how the block might be used, for every block, and the flowgraphs will live in the git repo.
[[File:Mic_to_OPUS.png]]
 
Non-GUI flow graph. Records a microphone to an OPUS-compressed .ogg file. Very handy.


== Source Files ==
== Source Files ==


; C++ files
; C++ files
: [https://github.com/gnuradio/gnuradio TODO]
: [https://github.com/gnuradio/gnuradio/blob/main/gr-blocks/lib/wavfile_sink_impl.cc wavfile_sink_impl.cc]
: [https://github.com/gnuradio/gnuradio/blob/main/gr-blocks/lib/wavfile_sink_impl.h wavfile_sink_impl.h]


; Header files
; Header files
Line 32: Line 45:


; Public header files
; Public header files
: [https://github.com/gnuradio/gnuradio TODO]
: [https://github.com/gnuradio/gnuradio/blob/main/gr-blocks/include/gnuradio/blocks/wavfile_sink.h wavfile_sink.h]


; Block definition
; Block definition
: [https://github.com/gnuradio/gnuradio TODO]
: [https://github.com/gnuradio/gnuradio/blob/main/gr-blocks/grc/blocks_wavfile_sink.block.yml blocks_wavfile_sink.block.yml]

Latest revision as of 11:53, 26 June 2022

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 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
wavfile_sink_impl.cc
wavfile_sink_impl.h
Header files
TODO
Public header files
wavfile_sink.h
Block definition
blocks_wavfile_sink.block.yml
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