[flac-dev] Max Sample Rate FLAC

[Martijn van Beurden]

Hi,

I don't know whether there is any software that supports this, 
but I suppose this is a specialty application that is not 
related to audio. The samplerate is in the end only metadata 
necessary to play back the audio, seeing that this is probably 
not audio anyway, why not set it to a random value and set the 
real samplerate as a vorbiscomment? Or maybe divide the 
samplerate by 1000 (so a 2.4MHz stream would have a set 
samplerate of 2.4kHz)

As long as you have a specific set of tools or a closed library 
(with a comment or notice somewhere for the user) that warns the 
user about this, it should work perfectly.

Hope this helps

Op 15-01-15 om 13:00 schreef Graham Weatherup:
>
> Hi,
>
> I would like to clear something up about Sample Rate, If the 
> Frame header can look to the metadata block streaminfo for 
> sample rate what (if anything limits it to 655350Hz)? Can all 
> frame headers not just point to streaminfo and it be specified 
> in streaminfo as all 1s ie 2^20-1 = 1,048,575Hz? It would be 
> really good to be able to use 1MHz and beyond for some of 
> my/our work. Does anything currently support this?
>
> Regards
>
> Graham
>
> Extracts from https://xiph.org/flac/format.html
>
> METADATA_BLOCK_STREAMINFO
>
> <20>      Sample rate in Hz. Though 20 bits are available, the 
> maximum sample rate is limited by the structure of frame 
> headers to 655350Hz. Also, a value of 0 is invalid.
>
> FRAME_HEADER
>
> 0000 : get from STREAMINFO metadata block
>
> :
>
> :
>
> 1100 : get 8 bit sample rate (in kHz) from end of header
>
> 1101 : get 16 bit sample rate (in Hz) from end of header
>
> 1110 : get 16 bit sample rate (in tens of Hz) from end of header
>
> 1111 : invalid, to prevent sync-fooling string of 1s
>
>
>
> _______________________________________________
> flac-dev mailing list
> flac-dev at xiph.org
> http://lists.xiph.org/mailman/listinfo/flac-dev

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.xiph.org/pipermail/flac-dev/attachments/20150115/fb5d0fa6/attachment.htm