39 Commits

Author	SHA1	Message	Date
Thomas Harte	279f4760d7	Eliminated buffer_size_ as something explicitly stored, and reduced size of delegate call out.	2017-07-16 15:01:39 -04:00
Thomas Harte	f931cd582d	Switched to use of std::vector in those few remaining places where I was still using a unique_ptr to a native type and newing for myself. So, some of my earliest bits of code.	2017-07-16 13:54:07 -04:00
Thomas Harte	e01f3f06c8	Completed curly bracket movement.	2017-03-26 14:34:47 -04:00
Thomas Harte	026b418b4a	Ensured filtered 1:1 audio resampling is applied.	2017-02-28 21:27:38 -05:00
Thomas Harte	c5016a3eaa	Completed flight of 'Outputs' to postfix underscores.	2016-12-03 11:02:34 -05:00
Thomas Harte	9c550c594a	Moved audio work back into its own thread, but this time it queues up an all happens only upon a flush. Hopefully to resolve synchronisation cost concerns.	2016-11-09 21:17:50 -05:00
Thomas Harte	eccfdabeab	Temporarily disabled thread hop, until I can find a way to batch these things.	2016-11-03 22:52:02 -04:00
Thomas Harte	4258401384	Implemented flush, added a call to it from the filter speaker's destructor, to ensure no race conditions on accessing the various bits of instance state there and below.	2016-10-19 21:15:04 -04:00
Thomas Harte	00e3ad9b04	Added a bit more ceiling for lowpass filtering on constrained machines.	2016-10-10 07:51:01 -04:00
Thomas Harte	e53455a936	Not having read the C++ synchronisation primitives before, this async task queue is probably incorrect. But nevertheless, let's have a quick go at employing it — in a hideously thread unsafe fashion — for audio generation. What can possibly go wrong?	2016-10-07 16:56:34 -04:00
Thomas Harte	dab3580111	Experimental: can I afford a lower sampling rate if there's a low-pass filter in effect?	2016-08-22 22:18:05 -04:00
Thomas Harte	1541273785	Moved responsibility for throwing in a low-pass filter up to the Vic, appropriately.	2016-08-21 18:13:31 -04:00
Thomas Harte	c783090980	It turns out that the Vic has a 1.6Khz low-pass filter. So added that.	2016-08-21 12:13:41 -04:00
Thomas Harte	fef316932f	Moved opening bracket appropriately.	2016-07-04 21:14:28 -04:00
Thomas Harte	8db44eed3e	Added a default implementation of Speaker::skip_samples.	2016-07-04 20:48:27 -04:00
Thomas Harte	ed8f4d0476	Added some minor additional bits of documentation.	2016-06-30 08:46:29 -04:00
Thomas Harte	2bd71e7e9b	.reset is the more normal way to reassign a unique_ptr.	2016-06-23 20:52:44 -04:00
Thomas Harte	fcf4b14344	Extended to allow floating-point sampling rates. Which makes sense.	2016-06-13 19:30:41 -04:00
Thomas Harte	1e0fcbbee8	Made a very basic stab at a couple of the tone generators, added straight-through path for the speaker when input rate exactly equals output rate.	2016-06-01 19:53:16 -04:00
Thomas Harte	5c4f35e13f	Finally started on generalising the C++ stuff so as to be able to be able to get a working audio binding on the OS-specific side without further repetition by factoring an appropriate protocol out from the Electron and sketching out the correct speaker class for the Atari. Added a method to ask it what a good output frequency would be.	2016-05-31 21:23:44 -04:00
Thomas Harte	5980f5e991	Number of taps can be specified explicitly if you desire.	2016-04-17 20:45:57 -04:00
Thomas Harte	499f7ace07	Re-enabled working video output for the Electron for the day and consolidated the rough metric I'm using to pick a number of taps for the audio filter.	2016-04-17 20:43:20 -04:00
Thomas Harte	6a17c2992d	Introduced a compile-time configurable audio divider, set it arbitrarily to '8' for now. Discovered why my graphics aren't centred and added a TODO.	2016-04-13 22:31:59 -04:00
Thomas Harte	ca35a7e222	Ensured that a much greater input rate than output is handled correctly.	2016-03-16 20:38:17 -04:00
Thomas Harte	4cd0aa3416	Completed FIR filter based audio output.	2016-03-15 23:37:35 -04:00
Thomas Harte	726c98446a	Fixed a couple of memory leaks, at least got as far as instantiating a filter.	2016-03-15 21:34:00 -04:00
Thomas Harte	0efe4b312c	Disabled my various bits of rate interchange debugging; improved test for when to call update_display due to a RAM write.	2016-01-21 22:16:52 -05:00
Thomas Harte	e65cd4cf06	Some data is marginally reaching the CPU from the tape.	2016-01-19 22:05:34 -05:00
Thomas Harte	ddcc34740b	Added lots of debugging output while I attempt to locate the source of audio scratchiness, also simplified manner of dealing with wraparound within the AudioQueue wrapper.	2016-01-18 13:50:19 -06:00
Thomas Harte	b58e59e2bb	Fixed: now outputting the requested output rate, rather than massively overproducing at the input rate.	2016-01-14 23:12:40 -05:00
Thomas Harte	383b2be4c6	Fixed one off-by-one error.	2016-01-14 21:33:27 -05:00
Thomas Harte	8bd04a6be4	Switched model for filter subclasses. Implemented test square[-ish] wave to check for obvious stream errors. None is clear.	2016-01-14 21:27:02 -05:00
Thomas Harte	38ffcaa262	Here, at last, is _some_ audio output, at least.	2016-01-14 20:33:22 -05:00
Thomas Harte	afde8dac49	Closed the loop such that audio manages to bubble up into Objective-C.	2016-01-13 22:38:59 -05:00
Thomas Harte	439d452e23	Resolved some errors.	2016-01-13 22:11:33 -05:00
Thomas Harte	49e89a4bcb	I'm not yet completely convinced by my approach to time basing, but it'll probably do? If so then this more or less gets me ready for a point-sampled filtering.	2016-01-13 22:02:39 -05:00
Thomas Harte	d9a7ef9e46	Edging towards audio output; the speaker is given appropriate input and output rates, and then updated with current divider and enabled/disabled status.	2016-01-13 21:03:43 -05:00
Thomas Harte	84ba4e2900	Tidied a little, started working towards supporting speaker output.	2016-01-12 22:19:56 -05:00
Thomas Harte	3437781abd	Started sketching out an interface for sound generation. Which made me realise that the CRT in CRTDelegate was redundant, since C++ has namespaces.	2016-01-12 16:54:09 -05:00