Increase the maximum number of audio channels #35

Not sure why it's doing this, but Renoise seems to report 112 speakers
per audio channel, so the 256 audio channel limit would be exceeded when
using more than 2 output channels.

CHANGELOG.md

@@ -16,6 +16,11 @@ Versioning](https://semver.org/spec/v2.0.0.html).
 
   TODO: Remove the notice about this from the README
 
+### Fixed
+
+- Increased the limit for the maximum number of audio channels. This would cause
+  issues in Renoise when using many output channels.
+
 ## [1.5.0] - 2020-08-21
 
 ### Added

src/common/serialization.h

@@ -34,9 +34,10 @@
 /**
  * The maximum number of audio channels supported. Some plugins report a huge
  * amount of input channels, even though they don't even process any incoming
- * audio.
+ * audio. Renoise seems to report 112 speakers per audio channel, so this limit
+ * is now quite a bit higher than it should have to be.
  */
-constexpr size_t max_audio_channels = 256;
+constexpr size_t max_audio_channels = 16384;
 /**
  * The maximum number of samples in a buffer.
  */