[haiku-bugs] Re: [Haiku] #9340: SACD/DSD decoding support
- From: "pulkomandy" <trac@xxxxxxxxxxxx>
- Date: Thu, 20 Nov 2014 12:32:11 -0000
#9340: SACD/DSD decoding support
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Reporter: forart.eu | Owner: nobody
Type: enhancement | Status: new
Priority: normal | Milestone: Unscheduled
Component: Audio & Video/Codecs | Version: R1/Development
Resolution: | Keywords: SACD
Blocked By: | Blocking:
Has a Patch: 0 | Platform: All
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Comment (by pulkomandy):
It's really 1-bit, however it's not an usual PCM encoding but pulse
density modulation. This can be decoded easily with an analogic
electronics circuit, removing the need for a classical DAC and the noise
and nonlinearities it introduces.
We could transcode to 8-bit audio, but this would result in a stream at
about 2.5megabytes per second (the sampling rate is very high to
compensate for the 1-bit resolution), and using only 8-bit would result in
low quality. Decoding to 16 or 32 bits audio would result to 5 or 10MB/s
bitrate, for a single channel (there can be 6 channels in a 5.1 disc).
And if we make the decoder itself downsample everything, then the high
quality of the format is lost and I don't see much point in the whole
effort.
--
Ticket URL: <https://dev.haiku-os.org/ticket/9340#comment:4>
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