Home

Welcome to the hero-studio wiki!

UI development

• Electron ideas
• Native UIs
• UI Design ideas
• Interesting blog about UI libs

Real-time multi-threading processing

Interesting videos about real-time audio processing with lock-free data structures and no allocations:

• CppCon 2015: Timur Doumler “C++ in the Audio Industry”
• C++ in the Audio Industry, Episode II: Floating Atomics, Timur Doumler, JUCE Summit 2015
• Rust Bay Area Meetup - November 13, 2018

Concurrent programming:

• https://github.com/crossbeam-rs/crossbeam

Lock-free data structures:

• rignbuf crate (no-std)
• Lock-free Rust: Crossbeam in 2019
• crossbeam spsc queue PR
• crossbeam ringbuffer design
• crossbeam-circbuf PR

Immutable data structures:

• https://github.com/bodil/im-rs
• https://github.com/orium/rpds

Memory pools:

• https://github.com/BurntSushi/mempool
• https://github.com/carllerche/slab

Realtime threads

• audio_thread_priority
• JackMachThread
• JackMMCSS

Measuring time within the real-time thread:

• JUCE and Tracktion seem not to care about calling the OS in the real-time context:
  • juce_linux_SystemStats
  • juce_AudioProcessLoadMeasurer
  • tracktion_CpuMeasurement
• There are two alternatives I can think of:
  • Counting CPU cycles
    • rdtsc in x86 (see crates quanta and clocksource)
    • pmccntr in ARM (see this C code)
  • Measuring time in another real-time thread with a much lower latency from that of the audio callback one, where an atomic value get incremented periodically, so the audio callback can use it to measure time. For example, for CPU usage measurement, it could be 1/100th of the audio callback latency, so I would get 1% precision.

Workflow model

• State of the art

MIDI

Backends

• CoreMIDI
• ALSA
• PortMidi

Useful information

• Reason: Numeric Timing Data in the Sequencer
• Summary of MIDI Messages
• WebMIDI scheduling
• Interview to Paul Davis (author of Ardour DAW)

Interval trees

• http://www.davismol.net/2016/02/07/data-structures-augmented-interval-tree-to-search-for-interval-overlapping/
• https://github.com/main--/rust-intervaltree/blob/master/src/lib.rs
• https://github.com/theban/interval-tree