WAV 64 bit (RF64) is extended format of WAV file (PCM format). This file type have either *.wav or *.rf64 extension.
What is WAV RF64 > WAV 64 vs WAV RF64 > WAV structure > How RF64 works > Converters > Players > Download samples >
RF64 is intendent to support:
Native WAV format support 32-bit (4 Gbyte) file size only due size variable limitations (32 bit integer). First symbolic sequence into WAV 32 bit file (WAV identificator) is "RIFF".
First symbolic sequence into WAV64 file is "RF64".
How audio converter AuI ConverteR 48x44 works with RF64
WAV 64 (WAV 64 bit) and WAV RF64 are different formats.
WAV may have bit depth 64 bit. We can call it as WAV 64 bit.
Standard WAV-header fields, that are responsible for size, have 32-bit length. These fields may be replaced to 64 bit ones. That file type may be called as WAV 64 or WAV 64 bit.
WAV RF64 is satndart WAV format extension, that contains special header and special rules to fill standard WAV headers.
Chunks are information blocks, that contains chunk identifier, the block size and information.
See graphical WAV RF64 format structure >
According WAV RF64 specification WAV files are processed next way:
1) Create WAV 32 bit file which contains:
RIFF-header;
JUNK-chunk (empty or dummy chunk);
fmt-chunk;
possible other chunks;
2) Append to end of file data-chunk. Append audio stream data.
3) End recording.
4) If recorded WAV-file less 4 Gbyte:
- set up size data into RIFF, data chunks;
- close file.
5) If recorded WAV-file more 4 Gbyte:
- replace RIFF-header to RF64-header;
- replace JUNK-chunk to dsd64-chunk with filling information about size recorded file;
- set up 0xFFFFFFFF data-chunk size;
- close file.
MBWF is RF64 file with bext-chunk. The terms "RF64" and "MBWF" can used as synonymous.
AuI ConverteR is capable to read RF64 or RIFF (32-bit) and convert with automatical selecting format of audio file by its size.
foobar2000
WinAmp
When convert sample rate of wav-file changing of output file size (relative to input file).
For upsampling: input file (wav 32 bit or RIFF) have sampling rate 44 kHz and size 2 Gbyte. Make conversion to 176 kHz. Output file have size 2 * (176/44) =8 Gbyte. Output file must have format wave 64 bit or RF64.
1. EBU Tech 3306 - MBWF / RF64: An Extended File Format for Audio
2. EBU Recommendation R111-2007 - Multichannel use of the BWF audio file format (MBWF)
June 19, 2020 updated | since August 19, 2012
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