Streaming video and audio for Apple II

kris 976e26f159 Vectorize the computation of diff weights, by precomputing a map ... of all possible weights. We encode the two 8-bit inputs into a single 16 bit value instead of dealing with an array of tuples. Fix an important bug in _compute_delta: old and is_odd were transposed so we weren't actually subtracting the old deltas! Surprisingly, when I accidentally fixed this bug in the vectorized version, the video encoding was much worse! This turned out to be because the edit distance metric allowed reducing diffs by turning on pixels, which meant it would tend to do this when "minimizing error" in a way that was visually unappealing. To remedy this, introduce a separate notion of substitution cost for errors, and weight pixel colour changes more highly to discourage them unless absolutely necessary. This gives very good quality results! Also vectorize the selection of page offsets and priorities having a negative error delta, instead of heapifying the entire page. Also it turns out to be a bit faster to compute (and memoize) the delta between a proposed content byte and the entire target screen at once, since we'll end up recomputing the same content diffs multiple times. (Committing messy version in case I want to revisit some of those interim versions)		2019-03-14 22:08:50 +00:00
audiotest/audiotest	Optimize some more to fit in memory!	2019-03-10 21:57:05 +00:00
ethernet/ethernet	Write symbol table to .dbg file when assembling player	2019-02-27 12:10:14 +00:00
simulator	- Allow HGR ROM entry point	2019-02-27 22:46:53 +00:00
audio.py	Remove vestige of standalone audio encoder.	2019-03-14 21:52:57 +00:00
frame_grabber.py	Integrated audio + video player!	2019-03-07 23:07:24 +00:00
main.py	fix	2019-03-14 21:45:40 +00:00
memory_map.py	Refactor the various representations of screen memory (bitmap, (x,y)	2019-03-03 22:21:28 +00:00
movie.py	Normalize audio by tasting the first 10M of the audio stream and	2019-03-14 21:40:09 +00:00
opcodes_test.py	Update cycle timing from working ethernet player.	2019-02-23 23:38:14 +00:00
opcodes.py	Construct opcodes and classes for all of the TICK_x_PAGE_y	2019-03-07 15:56:04 +00:00
scheduler.py	Introduction more general notion of update priority used to increase	2019-03-04 23:09:00 +00:00
screen.py	Refactor the various representations of screen memory (bitmap, (x,y)	2019-03-03 22:21:28 +00:00
server.py	Take filename to serve from argv.	2019-03-14 21:38:12 +00:00
symbol_table_test.py	Write symbol table to .dbg file when assembling player	2019-02-27 12:10:14 +00:00
symbol_table.py	Write symbol table to .dbg file when assembling player	2019-02-27 12:10:14 +00:00
video_test.py	Add some tests for edit_weight and byte_to_colour_string	2019-03-10 23:07:44 +00:00
video.py	Vectorize the computation of diff weights, by precomputing a map	2019-03-14 22:08:50 +00:00