CircuitPython - a Python implementation for teaching coding with microcontrollers https://git.suspectdevices.com/suspect-devices/circuitpython/atom?h=6.2.x 2021-03-15T13:57:36+00:00 2021-03-15T13:57:36+00:00 microDev 70126934+microDev1@users.noreply.github.com 2021-03-15T13:57:36+00:00 urn:sha1:a52eb88031620a81521b937f2a0651dbac2bb350 2020-07-15T14:26:47+00:00 Jeff Epler jepler@gmail.com 2020-05-11T13:51:41+00:00 urn:sha1:bdab6c12d4332523fdbd8967c1233b3708f4883e Before this, the mp3 file would be read into the in-memory buffer only when new samples were actually needed. This meant that the time to read mp3 content always counted against the ~22ms audio buffer length. Now, when there's at least 1 full disk block of free space in the input buffer, we can request that the buffer be filled _after_ returning from audiomp3_mp3file_get_buffer and actually filling the DMA pointers. In this way, the time taken for reading MP3 data from flash/SD is less likely to cause an underrun of audio DMA. The existing calls to fill the inbuf remain, but in most cases during streaming these become no-ops because the buffer will be over half full. 2020-01-06T19:35:43+00:00 Jeff Epler jepler@gmail.com 2020-01-06T19:35:43+00:00 urn:sha1:dd6010a17ef8e12e1cb3f36721b205cc1cb8eee9 2020-01-06T13:51:41+00:00 Jeff Epler jepler@gmail.com 2020-01-06T13:51:41+00:00 urn:sha1:dc729718eb2980e3b92a54e4cc60c7d6b0720e8a