Re: [SoX-users] 32 Bit Float Problem

[Måns R. <ma...@ma...>]

Thomas Foerster <tjf...@we...> writes:

> Hi,
>
> I am a little bit confused about the following procedure
> (Windows). What is wrong?
>
> 1. Take a usual 2ch/16 Bit/44,1 kHz WAV-File (CD)
> 2. To get a 32 Bit FLOAT 88200 Hz File:
> sox input_16_44100.wav" -b 32 -e float output_88200_32F.wav rate -s -a 
> -v -L 88200
> 3. sox output_88200_32F.wav output_88200_32F.raw
>
> The *.raw file has 58 bytes less-> the Wav-Float-Header has a size of
> 58 bytes. My own codecannot read this header in Audio format 3 (only
> wav-PCM and Extensible like 24 Bit Wav and 32 Bit Wav). I looked
> inside with Hex-Editor:
>
> -4 byte fact-chunk is beginning at byte 38
> -4 byte data-chunk is beginning at byte 50 ("usually" before fact-chunk)
>
> I could not read the size of the raw-data-chunk (raw data
> length). Theses bytes are at the end of the header. Here(hex): 00 00
> D8 0E -> 
> 55310 bytes, what is wrong!
> It should be (dec:) 249036800bytes! This would be 0E D8 00 00 -> most
> significant bit!
>
> Then I tried this:
> sox.exe -r 88200 -e float -b 24 -c 2output_88200_32F.raw out.wav
> Error!
> This would be working (but makes no sense...):
> sox.exe -r 88200 -e signed-integer -b 24 -c 2output_88200_32F.raw out.wav
>
> Any idea?

Can you post a hex dump of the full header?

-- 
Måns Rullgård