From: "Måns Rullgård" <mans@mansr.com>
To: Sylvain Leroux <sylvain@chicoree.fr>
Cc: sox-users@lists.sourceforge.net
Subject: Re: Soxi warn about missing extended part of the fmt chunk--but it seems to be there
Date: Fri, 22 Nov 2019 18:16:31 +0000 [thread overview]
Message-ID: <yw1xsgmfzshs.fsf@mansr.com> (raw)
In-Reply-To: <82417765-a2d3-3a9c-a445-6093141f12ee@chicoree.fr> (Sylvain Leroux's message of "Fri, 22 Nov 2019 16:10:21 +0100")
Sylvain Leroux <sylvain@chicoree.fr> writes:
> Hi everyone.
>
> First thank you for the great work and support. I'm in the process of
> writing a sound library for an internal project, and I realize more each
> day the amount of work the developers may have put in writing SoX.
>
> I am working now on a Wave file exporter, and while using `soxi` to
> verify the my wave files are well formed, I noticed the warning "wave
> header missing extended part of fmt chunk":
>
>> sh$ soxi -V4 test/tmp/float_32_1.wav
>> soxi INFO formats: detected file format type `wav'
>> soxi DBUG wav: WAV Chunk fmt
>> soxi INFO wav: EXTENSIBLE
>> soxi WARN wav: wave header missing extended part of fmt chunk
>> soxi DBUG wav: WAV Chunk fact
>> soxi DBUG wav: WAV Chunk data
>> soxi DBUG wav: Reading Wave file: IEEE Float format, 1 channel, 48000
>> samp/sec
>> soxi DBUG wav: 192000 byte/sec, 4 block align, 32 bits/samp,
>> 643200 data bytes
>> soxi DBUG wav: 160800 Samps/chans
>>
>> Input File : 'test/tmp/float_32_1.wav'
>> Channels : 1
>> Sample Rate : 48000
>> Precision : 24-bit
>> Duration : 00:00:03.35 = 160800 samples ~ 251.25 CDDA sectors
>> File Size : 643k
>> Bit Rate : 1.54M
>> Sample Encoding: 32-bit Floating Point PCM
>
> However, it seems to me I write the extended 40 bytes fmt chunk in the file:
>
>> 00000000 52 49 46 46 cc d0 09 00 57 41 56 45 66 6d 74 20 |RIFF....WAVEfmt |
>> 00000010 28 00 00 00 fe ff 01 00 80 bb 00 00 00 ee 02 00 |(...............|
>> 00000020 04 00 20 00[16 00]20 00 00 00 00 00 03 00 00 00 |.. ... .........|
>> 00000030 00 00 10 00 80 00 00 aa 00 38 9b 71 66 61 63 74 |.........8.qfact|
>> 00000040 04 00 00 00 80 d0 09 00 64 61 74 61 80 d0 09 00 |........data....|
>> 00000050 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
>> *
>> 0009d0d0
>
> At byte 0x24 we can see 0x0016 which is the size (22 bytes) of the
> extended fmt header, followed by the extended header content. And after
> that, the `fact` chunk starts.
>
> Why is `soxi` considering the extended header is missing?
There is a small bug that triggers that warning in error for some
combinations of parameters. Your file header looks correct to me.
--
Måns Rullgård
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next prev parent reply other threads:[~2019-11-22 18:33 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-22 15:10 Soxi warn about missing extended part of the fmt chunk--but it seems to be there Sylvain Leroux
2019-11-22 18:16 ` Måns Rullgård [this message]
2019-11-22 20:49 ` Sylvain Leroux
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