applause2 - Luajit-based synthesizer based on a stream algebra

Age	Commit message (Collapse)	Author	Files	Lines
2015-11-04	added simple support for MIDI CC commands	Robin Haberkorn	3	-3/+144
	* MIDICCStream provides a stream of CC values as if polled from the controller (this is emulated in applause.c)
2015-11-03	enforce minimum buffer size for lua<->realtime communication based on ↵	Robin Haberkorn	1	-2/+17
	jack_get_buffer_size()
2015-11-03	fixed ZipStream for non-stream operands (like numbers)	Robin Haberkorn	1	-1/+2

2015-11-03	fixed semaphore for realtime<->lua thread synchronization	Robin Haberkorn	1	-8/+16

2015-11-03	allow Stream:play() to be interrupted by CTRL+C	Robin Haberkorn	1	-1/+35
	* more precisely, Stream:play() will now throw an error whenever the process receices SIGINT. * this allows us to interrupt long playbacks
2015-11-03	ring buffer size is configurable now via ./applause command-line parameter ↵	Robin Haberkorn	1	-9/+32
	in milliseconds * default buffer size: 100ms
2015-11-03	synchronize buffer access via System V semaphore	Robin Haberkorn	1	-10/+74
	* allows the Lua thread to block when the ringbuffer is full while keeping the realtime thread (jack_process()) realtime-safe. Hopefully :-) * since audio generation is usually faster than consumption (if you don't want to have buffer underruns), this fixes audio generation longer than BUFFER_SIZE (currently 1s)
2015-11-03	report buffer underruns	Robin Haberkorn	1	-6/+23

2015-05-03	changed semantics of the __call metamethod: create VectorStream	Robin Haberkorn	1	-18/+25
	* the call metamethod is most useful in compositions in order to evaluate a stream to save computing power at runtime. * this meant that in addition to adding () to a stream expression it was necessary to convert the table to a stream (e.g. using tostream()). * Now the totable() method converts to a pure table, while __call returns a VectorStream. This means it will be sufficient to add "()" in order to evaluate a stream eagerly
2015-04-30	added Stream.save() and SndfileStream based on FFI wrapper around libsndfile	Robin Haberkorn	2	-0/+253

2015-04-30	use LuaJIT's FFI instead of lposix library for clock_gettime()	Robin Haberkorn	1	-5/+33

2015-04-30	added RavelStream and minor changes to make streams of non-numbers possible	Robin Haberkorn	1	-5/+68

2015-04-28	optimizations, scalar operations and ZipStream as an abstraction of stream ↵	Robin Haberkorn	1	-138/+211
	operations
2015-04-20	resample() and toplot() methods	Robin Haberkorn	1	-0/+49

2015-04-20	added bit-crusher effect	Robin Haberkorn	1	-0/+6

2015-04-20	filters: handle input streams shorter than the frequency stream	Robin Haberkorn	1	-18/+24

2015-04-20	filtering: handle frequency streams short than the input stream	Robin Haberkorn	1	-4/+16

2015-04-20	added filter streams adapted from ChucK and revised wave form functions	Robin Haberkorn	1	-19/+373
	* LPF, HPF, BPF, BRF filters are 2nd order Butterworth filters. Derived verbatim from ChucK's implementation. This can probably be optimized by caching the tan/cos functions. Also, they do not yet handle frequency streams shorter than the stream to filter. * Basic wave forms are now Stream methods to allow concatenative style of FM synthesis (or LFOs). To generate e.g. a sine wave with constant frequency, you can still write Stream.SinOsc(440); or tostream(440):SinOsc()
2015-04-11	stop garbage collector temporarily during play()	Robin Haberkorn	1	-1/+16
	This improves the real-time properties of sample generation since it avoids CPU spkikes. On the other hand, this may not be ideal as playing a long streams could have non-constant space requirements now. A proper solution would probably involve calling the garbage collector incrementally during the play() loop.
2015-04-11	added custom interactive Lua interpreter for evaluating applause expressions	Robin Haberkorn	4	-1/+307
	* implements Stream:play() using Jack as the audio backend
2015-04-09	additional useful stream operations	Robin Haberkorn	1	-13/+54

2015-04-07	replaced co-routine based implementation with closures	Robin Haberkorn	1	-72/+153
	* this improves performance by 10 times (both lua5.1 and luajit) * also, when using luajit, there appears to be little peformance loss when using stream compositions instead of maps (which are sometimes even slower!?)
2015-04-07	initial commit based on coroutines	Robin Haberkorn	1	-0/+462