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document buffer requirement, add sidechain constraint.

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Robin Gareus
2016-04-14 22:43:14 +02:00
parent 03db4805fd
commit ba67217dbc
1 changed files with 14 additions and 1 deletions
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15
libs/ardour/plugin_insert.cc
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@@ -1464,8 +1464,21 @@ PluginInsert::configure_io (ChanCount in, ChanCount out)
/* only the "noinplace_buffers" thread buffers need to be this large,
* this can be optimized. other buffers are fine with
* ChanCount::max (natural_input_streams (), natural_output_streams())
* and route.cc's max (configured_in, configured_out)
*
* no-inplace copies "thru" outputs (to emulate in-place) for
* all outputs (to prevent overwrite) into a temporary space
* which also holds input buffers (in case the plugin does process
* in-place and overwrites those).
*
* this buffers need to be at least as
* natural_input_streams () + possible outputs.
*
* sidechain inputs add a constraint on the input:
* configured input + sidechain (=_configured_internal)
*/
_required_buffers = natural_input_streams () + natural_output_streams() * get_count();
_required_buffers =ChanCount::max (_configured_internal,
natural_input_streams () + ChanCount::max (_configured_out, natural_output_streams () * get_count ()));
if (old_in != in || old_out != out || old_internal != _configured_internal
|| (old_match.method != _match.method && (old_match.method == Split || _match.method == Split))