On Tue, 17 Oct 2017, Devin Heitmueller wrote:
> The decklink sdk only defines two BMDAudioSampleType values:
bmdAudioSampleType16bitInteger and bmdAudioSampleType32bitInteger. I don't think
there's an easy way to support a 24 bit input here. Generally in this case I've
used bmdAudioSampleType32bitInteger and then encode it at pcm_s24le.
Dave Rice
For what it’s worth, I’ve got deinterleaving code in the works to handle
capture of multiple pairs of audio (i.e. break 16 channels into 8 pairs
and announce them as separate S16LE streams). If we really thought
24-bit was desirable, that code could be adjusted accordingly (the
hardware would still capture 32-bit, but the deinterleaver would put out
S24LE).
Breaking 8/16 channels to stereo streams can be done by an audio filter
(by using "asplit" to multiply the source to 4 outputs and then "pan" or
"channelmap" on each output to select the proper source channels), so I
don't think direct support of splitting channels in the decklink device is
acceptable.
If you have performance or convenience problems with using the
filters above then propose a filter wich does this in a single step or
extend one of the existing ones to be able to do this.
Regards,
Marton
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