Subject: Re: [ecasound] Internal Format and 24-bits?
From: Robert Jonsson (robert.jonsson_AT_dataductus.se)
Date: Wed Jan 23 2002 - 09:56:34 EET
Hi,
As a sidenote, would be interesting to know what soundcard you are going to
use/is using?
...curious by nature :-)
Regards
Robert
Kai Vehmanen wrote:
> On Tue, 22 Jan 2002, Len Moskowitz wrote:
>
>
>>I don't expect to do anything more complicated than storing the 24-bit data
>>to a WAV-format file and perhaps playing it; no processing, no editing.
>>
>
> 24bit won't be a problem. Ecasound uses 32bit floats as its internal
> format. As for inputs and outputs, both 24bit and 32bit (float and
> integer) formats are supported (at least with ALSA, OSS soundcard drivers,
> and wav and raw audio file formats).
>
> If 32bit float doesn't seem enough, edit the
> ecasound/libecasound/sample-specs.h file, and change sample_t type from
> float to double and then recompile. After this change, ecasound will use
> 64bit doubles for all internal operations. Only drawback to this (aside
> from performance) is that you will lose some features, like LADSPA plugin
> support, which require 32bit float data.
>
>
>>In the ecasound documentation it says that everything is converted to its
>>internal format. Will there be any problem setting the internal format to
>>24-nbit/96 kHz so that the data stream is not ever resampled?
>>
>
> 96kHz won't be a problem either, but be sure to add -sr:96000 to the
> command-line to avoid resampling (otherwise ecasound would resample
> to/from its default 44.1kHz internal srate).
>
>
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