suspect-devices/circuitpython/shared-module/audiomixer, branch 5.1.0 CircuitPython - a Python implementation for teaching coding with microcontrollers https://git.suspectdevices.com/suspect-devices/circuitpython/atom?h=5.1.0 2020-01-20T20:08:56+00:00 Mixer: rename function based on review comment 2020-01-20T20:08:56+00:00 Jeff Epler jepler@gmail.com 2020-01-20T20:06:39+00:00 urn:sha1:b4ddee2bb6ae40a73efe15e30de8d33ab9ce8011 Mixer: use MP_LIKELY macro instead of locally brewed one 2020-01-20T20:08:32+00:00 Jeff Epler jepler@gmail.com 2020-01-20T20:08:32+00:00 urn:sha1:982c63a71712fc9092b35fca3ef34e4b404c03cb Mixer: Rework for performance, particularly of the S16 case 2020-01-16T16:48:38+00:00 Jeff Epler jepler@gmail.com 2020-01-12T17:02:47+00:00 urn:sha1:449dbea4567dbc27a01ae695b9cebf776a6927f0 This removes downscaling (halving-add) when multiple voices are being mixed. To avoid clipping, and get similar behavior to before, set the "level" of each voice to (1/voice_count). Slow paths that were applicable to only M0 chips were removed. As a side effect, the internal volume representation is now 0 .. 0x8000 (inclusive), which additionally makes a level of exactly 0.5 representable. Testing performed, on PyGamer: For all 4 data cases, for stereo and mono, for 1 and 2 voices, play pure sign waves represented as RawSamples and view the result on a scope and through headphones. Also, scope the amount of time spent in background tasks. Code size: growth of +272 bytes Performance (time in background task when mixing 2 stereo 16-bit voices): 76us per down from 135us (once per ~2.9ms long term average) (Decrease from 4.7% to 2.4% of all CPU time) mixer: factor out mix_one_voice 2020-01-16T16:31:26+00:00 Jeff Epler jepler@gmail.com 2020-01-12T16:12:42+00:00 urn:sha1:e6869c8983ba732f77076242c86041aa77a047e0 audiosample: convert to use a protocol 2019-12-04T15:31:52+00:00 Jeff Epler jepler@gmail.com 2019-12-04T15:31:52+00:00 urn:sha1:feb8eb935bd69ce855533bf9a4316e3025602c1a This eases addition of new sample sources, since the manual virtual function dispatch functions are just calls via a protocol audiomixer: Supply constants in a way "-Og" optimization expects 2019-09-09T02:18:15+00:00 jepler jepler@gmail.com 2019-09-09T02:17:36+00:00 urn:sha1:8768896d6b0ddb35568ad996781a33fd3a0df94f These arguments are constrained to be compile-time constants, a fact that gcc complains about under "-Og" optimization, but not in normal builds. Declare them as enumerated types remove leftover debug print 2019-09-04T03:25:27+00:00 sommersoft sommersoft@gmail.com 2019-09-04T03:25:27+00:00 urn:sha1:edfcee29ff88faa35a75a979cb74ad64553289a6 use more accurate ARMv7 prepocessor flags; TODOs for asm instructions 2019-09-01T22:36:29+00:00 sommersoft sommersoft@gmail.com 2019-09-01T22:36:29+00:00 urn:sha1:362c1664ae5979f288e8cb12d528f8cd44100410 include CMSIS instrinsic addition functions for M4; cleanup C math funcs 2019-08-31T22:36:54+00:00 sommersoft sommersoft@gmail.com 2019-08-31T22:36:54+00:00 urn:sha1:3c7c3c98d7f497df33f0503162fb7b1721ef7ecd fix 'audiomixer_mixer_reset_buffer' 2019-08-25T14:33:23+00:00 sommersoft sommersoft@gmail.com 2019-08-25T14:33:23+00:00 urn:sha1:7f64af38cbd74b417b28e28e706dceb00e42b01b