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List:       flac-dev
Subject:    Re: [flac-dev] Wrong warning in encoder for 24bits WAV
From:       Olivier Tristan <o.tristan () uvi ! net>
Date:       2014-03-20 17:13:35
Message-ID: 532B21BF.1050802 () uvi ! net
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I never seen this before.

Thanks a lot.

Le 20/03/2014 16:45, lvqcl a écrit :
> Olivier Tristan wrote:
>
>> I've just faced a wrong warning trying to encode a 24 bits WAV file
>>
>> if(wFormatTag == 1) {
>>                   if(bps != 8 && bps != 16) {
>>                       if(bps == 24 || bps == 32) {
>>                           /* let these slide with a warning since they're
>> unambiguous */
>>                           flac__utils_printf(stderr, 1, "%s: WARNING:
>> legacy WAVE file has format type %u but bits-per-sample=%u\n",
>> e->inbasefilename, (unsigned)wFormatTag, bps);
>>
>> AFAIK only 32bits file require a format of 3 while it's fine for 8, 16
>> and 24bits
> FLAC expects wFormatTag == 0xFFFE when bitdepth is not 8 or 16.
>
> See http://msdn.microsoft.com/en-us/library/windows/desktop/dd757713.aspx
>
> "If wFormatTag is WAVE_FORMAT_PCM, then wBitsPerSample should be equal to 8 or 16.
> [...]
> If wFormatTag is WAVE_FORMAT_EXTENSIBLE, this value can be any integer multiple of 8."
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>


-- 
Olivier TRISTAN
uvi.net

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