518 lines
27 KiB
Org Mode
518 lines
27 KiB
Org Mode
#+TITLE: DJ Console — Design Document
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#+AUTHOR: Glenn Thompson
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#+DATE: 2026-03-05
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* Overview
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The DJ Console is a new feature for Asteroid Radio that allows DJs to mix
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tracks live from the station's music library, or connect external audio
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equipment (turntables, CDJs, mixers, etc.) to broadcast live sets.
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The console is a dedicated web page at =/asteroid/dj=, accessible to users
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with the =:dj= or =:admin= role. It provides a dual-deck interface with
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crossfader, per-deck volume, library search, and external audio input —
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all feeding into the existing Harmony mixer and streaming pipeline.
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** Why This Works
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The current CL-Streamer architecture makes this straightforward:
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- *Harmony's mixer already sums all active voices.* The streaming drain,
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encoders (LAME, FDK-AAC), and broadcast buffers don't need to change.
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A DJ session is just manual control over which voices are playing and
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at what volume.
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- *play-file already creates Harmony voices.* Each deck loads a track
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the same way the auto-playlist does — the difference is that the DJ
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controls when to start, stop, and crossfade rather than the =play-list= loop.
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- *External audio input* is another voice on the mixer. Whether it
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comes from a local sound card (ALSA/PulseAudio/JACK) or a network
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audio stream, once it's a Harmony source, it's mixed identically to
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library tracks.
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* Architecture
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** System Diagram
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#+BEGIN_EXAMPLE
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┌──────────────────────────────────────────────────────────────┐
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│ SBCL Process │
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│ │
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│ ┌─────────────────────────────────────────────────────┐ │
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│ │ DJ Session (dj-session.lisp) │ │
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│ │ │ │
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│ │ ┌──────────┐ ┌──────────┐ │ │
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│ │ │ DECK A │ │ DECK B │ │ │
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│ │ │ voice-a │ │ voice-b │ │ │
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│ │ │ vol: 0.8 │ │ vol: 0.6 │ │ │
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│ │ │ state: │ │ state: │ │ │
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│ │ │ playing │ │ cued │ │ │
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│ │ └────┬─────┘ └────┬─────┘ │ │
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│ │ │ │ │ │
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│ │ │ ┌──────────────┐ │ │ │
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│ │ │ │ EXTERNAL IN │ │ │ │
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│ │ │ │ (optional) │ │ │ │
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│ │ │ │ voice-ext │ │ │ │
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│ │ │ └──────┬───────┘ │ │ │
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│ │ │ │ │ │ │
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│ │ ┌────▼─────────▼─────────▼────┐ │ │
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│ │ │ CROSSFADER (0.0 — 1.0) │ │ │
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│ │ │ Adjusts A/B balance │ │ │
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│ │ └─────────────┬───────────────┘ │ │
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│ └────────────────│────────────────────────────────────┘ │
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│ │ │
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│ ┌────▼────┐ │
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│ │ Harmony │ │
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│ │ Mixer │ (sums all active voices) │
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│ └────┬────┘ │
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│ │ │
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│ ┌────────────────▼──────────────────────────────────┐ │
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│ │ streaming-drain (unchanged) │ │
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│ │ float→s16 → LAME (MP3) + FDK-AAC (AAC) │ │
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│ │ → broadcast buffers → HTTP clients │ │
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│ └────────────────────────────────────────────────────┘ │
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│ │
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│ ┌───────────────────────┐ ┌────────────────────────┐ │
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│ │ Auto-Playlist │ │ Radiance Web Server │ │
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│ │ (paused while DJ live) │ │ (port 8080) │ │
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│ └───────────────────────┘ └────────────────────────┘ │
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└──────────────────────────────────────────────────────────────┘
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#+END_EXAMPLE
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** Audio Flow
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When a DJ session is active:
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1. The auto-playlist (=play-list= loop) is paused — its current
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position is saved for seamless resume later.
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2. The DJ loads tracks onto Deck A and/or Deck B via the library search.
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3. Each deck creates a Harmony voice. =play-file= is called with =:on-end :disconnect= so the voice cleans up when the track ends.
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4. The crossfader adjusts the =(mixed:volume)= of each deck's voice:
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- Position 0.0: Deck A at full volume, Deck B silent
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- Position 0.5: Both at equal volume
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- Position 1.0: Deck B at full volume, Deck A silent
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5. Per-deck volume knobs provide independent gain before the crossfader.
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6. Harmony's mixer sums all active voices (both decks + external input
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if connected).
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7. The streaming drain captures the mixed output — identical to
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auto-playlist mode. Encoders and listeners are unaware of the
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source change.
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When the DJ ends the session:
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1. Active decks fade out over 3 seconds (=volume-ramp=).
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2. The auto-playlist resumes from the saved position.
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3. ICY metadata updates to show the resumed track.
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* External Audio Input
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** Use Cases
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- *Turntable/CDJ setup*: DJ connects external hardware to the server's
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sound card (line-in, USB audio interface)
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- *Remote DJ*: DJ streams audio over the network from their own
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equipment/software (e.g., Traktor, Serato, Ableton, BUTT)
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- *Hybrid set*: DJ mixes between library tracks on the decks and
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external audio input
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** Option 1: Local Sound Card Input (ALSA/PulseAudio/JACK)
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For DJs with physical access to the server (or a connected audio
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interface), cl-mixed can capture from ALSA, PulseAudio, or JACK:
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- =cl-mixed-pulse= — PulseAudio source capture
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- =cl-mixed-alsa= — ALSA device capture
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- =cl-mixed-jack= — JACK audio connection
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The captured audio becomes a Harmony source that feeds into the mixer
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like any other voice. This is the lowest-latency option.
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#+BEGIN_EXAMPLE
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┌──────────────┐ ┌───────────┐ ┌─────────────┐
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│ Turntable / │───▶│ USB Audio │───▶│ ALSA/Pulse │
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│ CDJ / Mixer │ │ Interface │ │ Capture │
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└──────────────┘ └───────────┘ └──────┬──────┘
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│
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┌───────▼───────┐
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│ Harmony Voice │
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│ (ext-input) │
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└───────┬───────┘
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│
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┌───────▼───────┐
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│ Harmony Mixer │
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│ → encoders → │
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│ listeners │
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└───────────────┘
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#+END_EXAMPLE
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** Option 2: Network Audio Input (Remote DJ)
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For remote DJs, the server accepts an incoming audio stream. The DJ
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sends audio from their software (BUTT, Traktor, etc.) over HTTP or
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Icecast protocol to a receive endpoint on the CL-Streamer server.
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The incoming compressed audio (MP3 or Ogg) is decoded and fed into
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Harmony's mixer as another voice.
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#+BEGIN_EXAMPLE
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┌──────────────┐ ┌──────────────────┐
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│ DJ Software │ ──HTTP──▶│ CL-Streamer │
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│ (BUTT, │ or SRT │ /dj-input mount │
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│ Traktor, │ │ │
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│ etc.) │ │ decode → Harmony │
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└──────────────┘ │ voice (ext-input)│
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└────────┬─────────┘
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│
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┌────────▼─────────┐
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│ Harmony Mixer │
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│ → encoders → │
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│ listeners │
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└──────────────────┘
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#+END_EXAMPLE
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Implementation options:
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- *Icecast source protocol*: DJ software connects as an Icecast source
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client (=SOURCE /dj-input HTTP/1.0=). CL-Streamer accepts the
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connection, decodes the incoming MP3/Ogg stream via cl-mixed, and
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routes it to the mixer. Most DJ software already supports this.
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- *SRT (Secure Reliable Transport)*: Lower latency for remote DJs.
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Would require SRT library integration (future).
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- *WebRTC*: Browser-based DJ could stream from their mic/mixer via
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WebRTC. Complex but enables browser-only DJ workflow (future).
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** Option 3: Hybrid
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Both options can be active simultaneously. The DJ console UI shows an
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"External Input" channel alongside Deck A and Deck B, with its own
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volume control and mute button. The crossfader operates on Deck A/B;
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the external input has independent volume.
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* Access Control
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** Route and Roles
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- *URL*: =/asteroid/dj=
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- *Required role*: =:dj= (which also grants access to =:admin= users,
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since admin inherits all lower roles)
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- *Single session*: Only one DJ session can be active at a time. The
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session is owned by the user who started it.
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- *Admin override*: Admin users can end any DJ session (e.g., if a DJ
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disconnects without ending cleanly)
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** Session Lifecycle
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1. DJ navigates to =/asteroid/dj= and clicks "Go Live"
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2. Server pauses the auto-playlist and creates a =dj-session= struct
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3. DJ loads tracks, mixes, broadcasts
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4. DJ clicks "End Session" — decks fade out, auto-playlist resumes
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5. If DJ disconnects without ending: a watchdog timer (configurable,
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default 60s of no API polls) auto-ends the session
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* Backend Design
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** New file: =dj-session.lisp=
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*** DJ Session State
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#+BEGIN_SRC lisp
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(defclass dj-session ()
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((owner :initarg :owner :accessor session-owner
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:documentation "Username of the DJ who owns this session")
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(started-at :initarg :started-at :accessor session-started-at
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:initform (get-universal-time))
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(deck-a :initform (make-instance 'dj-deck :name :a) :accessor session-deck-a)
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(deck-b :initform (make-instance 'dj-deck :name :b) :accessor session-deck-b)
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(crossfader :initform 0.5 :accessor session-crossfader
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:documentation "0.0 = all A, 1.0 = all B")
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(external-input :initform nil :accessor session-external-input
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:documentation "External audio voice, or NIL if not connected")
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(external-volume :initform 1.0 :accessor session-external-volume)
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(last-poll :initform (get-universal-time) :accessor session-last-poll
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:documentation "Timestamp of last UI poll, for watchdog")
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(saved-playlist-state :initform nil :accessor session-saved-playlist-state
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:documentation "Auto-playlist state saved on session start")))
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(defclass dj-deck ()
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((name :initarg :name :accessor deck-name :documentation ":a or :b")
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(file-path :initform nil :accessor deck-file-path)
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(voice :initform nil :accessor deck-voice
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:documentation "Harmony voice, or NIL if not loaded/playing")
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(volume :initform 1.0 :accessor deck-volume
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:documentation "Per-deck volume before crossfader")
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(state :initform :empty :accessor deck-state
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:documentation ":empty, :loaded, :playing, :paused")
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(track-info :initform nil :accessor deck-track-info
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:documentation "Plist: (:artist :title :album :file :display-title)")))
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(defvar *dj-session* nil
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"The currently active DJ session, or NIL if no DJ is live.")
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#+END_SRC
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*** Key Functions
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| Function | Description |
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|---------------------------------+-----------------------------------------------------|
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| =start-dj-session (user)= | Pause auto-playlist, create session |
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| =end-dj-session ()= | Fade out decks, resume auto-playlist |
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| =load-deck (deck file-path)= | Load a track onto deck (reads metadata, creates voice) |
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| =play-deck (deck)= | Start playback on a loaded/paused deck |
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| =pause-deck (deck)= | Pause a playing deck |
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| =stop-deck (deck)= | Stop and unload a deck |
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| =seek-deck (deck position)= | Seek to position (seconds) |
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| =set-crossfader (position)= | Set crossfader 0.0–1.0, updates deck volumes |
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| =set-deck-volume (deck vol)= | Set per-deck volume 0.0–1.0 |
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| =connect-external-input (src)= | Connect external audio source to mixer |
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| =disconnect-external-input ()= | Disconnect external audio |
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| =set-external-volume (vol)= | Set external input volume |
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| =dj-session-status ()= | Returns full state for UI polling |
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| =dj-watchdog-check ()= | Called by cl-cron; ends stale sessions |
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*** Crossfader Volume Calculation
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The crossfader applies a constant-power curve so the perceived volume
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stays consistent across the sweep:
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#+BEGIN_SRC lisp
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(defun crossfader-volumes (position)
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"Return (values vol-a vol-b) for crossfader position 0.0–1.0.
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Uses constant-power (equal-power) curve."
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(let ((angle (* position (/ pi 2.0))))
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(values (cos angle) ;; Deck A: 1.0 at 0.0, 0.0 at 1.0
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(sin angle)))) ;; Deck B: 0.0 at 0.0, 1.0 at 1.0
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#+END_SRC
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The effective volume for each deck is:
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=effective-volume = deck-volume * crossfader-component=
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This is applied by setting =(mixed:volume voice)= on each deck's
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Harmony voice.
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*** ICY Metadata During DJ Session
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When the DJ is live, ICY metadata updates to reflect the currently
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audible track. Options:
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- *Auto-detect*: Whichever deck is louder (based on crossfader
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position) determines the displayed track
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- *Manual override*: DJ can set custom metadata text (e.g., "DJ Fade
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— Live Set")
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- *Session default*: Show "DJ <username> — Live" when the session starts
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* API Endpoints
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All endpoints require =:dj= role.
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** Session Management
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| Endpoint | Method | Description |
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|-----------------------------------+--------+--------------------------------------|
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| =asteroid/dj/session/start= | POST | Start DJ session |
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| =asteroid/dj/session/end= | POST | End session, resume auto-playlist |
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| =asteroid/dj/session/status= | GET | Full state (polled by UI every 500ms) |
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| =asteroid/dj/session/metadata= | POST | Set custom ICY metadata text |
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** Deck Control
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| Endpoint | Method | Params | Description |
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|-----------------------------------+--------+--------------------------+----------------------|
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| =asteroid/dj/deck/load= | POST | deck (a/b), track-id | Load track onto deck |
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| =asteroid/dj/deck/play= | POST | deck | Play |
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| =asteroid/dj/deck/pause= | POST | deck | Pause |
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| =asteroid/dj/deck/stop= | POST | deck | Stop and unload |
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| =asteroid/dj/deck/seek= | POST | deck, position (seconds) | Seek |
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| =asteroid/dj/deck/volume= | POST | deck, volume (0.0–1.0) | Set deck volume |
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** Crossfader
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| Endpoint | Method | Params | Description |
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|-----------------------------------+--------+---------------------+----------------------|
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| =asteroid/dj/crossfader= | POST | position (0.0–1.0) | Set crossfader |
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** External Input
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| Endpoint | Method | Params | Description |
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|-----------------------------------+--------+---------------------+----------------------------|
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| =asteroid/dj/external/connect= | POST | source (alsa/pulse) | Connect local audio input |
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| =asteroid/dj/external/disconnect= | POST | | Disconnect external input |
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| =asteroid/dj/external/volume= | POST | volume (0.0–1.0) | Set external input volume |
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** Library Search
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| Endpoint | Method | Params | Description |
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|-----------------------------------+--------+---------------------+----------------------------|
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| =asteroid/dj/library/search= | GET | q (search query) | Search library for tracks |
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* Frontend Design
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** Template: =template/dj-console.ctml=
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*** Layout
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#+BEGIN_EXAMPLE
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┌─────────────────────────────────────────────────────────────┐
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│ 🎛️ DJ CONSOLE DJ: fade [End Session]│
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├────────────────────────┬────────────────────────────────────┤
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│ │ │
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│ ◉ DECK A │ ◎ DECK B │
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│ ───────────────── │ ───────────────── │
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│ Orbital │ (empty) │
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│ Halcyon + On + On │ │
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│ Brown Album │ │
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│ │ │
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│ ▶ ⏸ ■ │ ▶ ⏸ ■ │
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│ [========|------] │ [-------------] │
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│ 2:14 / 9:27 │ 0:00 / 0:00 │
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│ │ │
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│ VOL [=========-] │ VOL [=========-] │
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│ │ │
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├────────────────────────┴────────────────────────────────────┤
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│ │
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│ A [===================|===================] B │
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│ CROSSFADER │
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│ │
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├──────────────────────────────────────────────────────────────┤
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│ 🎤 EXTERNAL INPUT [Connect] Vol [=========-] │
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│ Status: Not connected │
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├──────────────────────────────────────────────────────────────┤
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│ 📚 LIBRARY │
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│ [____________________________] [Search] │
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│ │
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│ Artist Title Album Action │
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│ ─────────────────── ───────────────────── ───────── ─────── │
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│ Orbital Halcyon + On + On Brown.. [A] [B] │
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│ Underworld Born Slippy (Nuxx) STITI [A] [B] │
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│ Boards of Canada Kid for Today In a.. [A] [B] │
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│ Drexciya Bubble Chamber Journey [A] [B] │
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│ Model 500 Digital Solutions Digital [A] [B] │
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│ ... │
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│ │
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│ ◀ Page 1 of 12 ▶ │
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└──────────────────────────────────────────────────────────────┘
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#+END_EXAMPLE
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*** UI Behaviour
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- *Status polling*: ParenScript polls =asteroid/dj/session/status=
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every 500ms for deck positions, crossfader state, and track info.
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This keeps the progress bars and time displays in sync.
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- *Crossfader*: An HTML range input (slider). On change, sends the
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new position to =asteroid/dj/crossfader=.
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- *Deck volume*: Vertical or horizontal sliders per deck.
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- *Library search*: Text input with debounced search (300ms delay).
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Results show artist, title, album, and [Load A] / [Load B] buttons.
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- *Deck controls*: Play/Pause/Stop buttons. Seek by clicking on the
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progress bar.
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- *External input*: Connect button opens a dropdown to select audio
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source (ALSA device, PulseAudio). Volume slider.
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- *Session indicator*: Shows who is currently DJing and session
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duration. Visible to admin users from the admin dashboard as well.
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** ParenScript: =parenscript/dj-console.lisp=
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Key functions:
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| Function | Description |
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|-----------------------------+-------------------------------------------|
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| =poll-session-status= | GET status, update all UI elements |
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| =load-track-to-deck= | POST load, refresh deck display |
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| =toggle-deck-playback= | Play/pause deck |
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| =stop-deck= | Stop and unload |
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| =update-crossfader= | POST new crossfader position |
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| =update-deck-volume= | POST new volume |
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| =search-library= | GET search results, render table |
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| =start-session= | POST session start |
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| =end-session= | POST session end, redirect to front page |
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| =connect-external= | POST external input connection |
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* Navigation
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Add "DJ Console" link to =template/partial/navbar-admin.ctml=, visible
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only to users with =:dj= or =:admin= role:
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#+BEGIN_SRC html
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<c:unless test='(asteroid::member-string "dj" (** :navbar-exclude))'>
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<a href="/asteroid/dj"
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lquery='(attr :target (when framesetp "_self"))'>
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🎛️ DJ
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</a>
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</c:unless>
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#+END_SRC
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The DJ link appears between "Profile" and "Admin" in the navbar. For
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=:dj= users who don't have =:admin= access, they won't see the Admin
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or Users links but will see the DJ Console link.
|
||
|
||
* Files to Create / Modify
|
||
|
||
** New Files
|
||
|
||
| File | Description |
|
||
|-----------------------------------+--------------------------------------------------|
|
||
| =dj-session.lisp= | DJ session state, deck management, auto-fallback |
|
||
| =parenscript/dj-console.lisp= | DJ console UI logic (ParenScript) |
|
||
| =template/dj-console.ctml= | DJ console HTML template |
|
||
|
||
** Modified Files
|
||
|
||
| File | Change |
|
||
|--------------------------------------------+-----------------------------------------------|
|
||
| =asteroid.lisp= | Add =define-page dj-console=, DJ API endpoints, serve =dj-console.js= |
|
||
| =asteroid.asd= | Add =dj-session= to =:components= |
|
||
| =template/partial/navbar-admin.ctml= | Add DJ Console nav link |
|
||
| =stream-harmony.lisp= | Add pause/resume hooks for auto-playlist |
|
||
| =cl-streamer/harmony-backend.lisp= | Export deck-level play/pause/seek if needed |
|
||
| =cl-streamer/package.lisp= | Export new symbols |
|
||
|
||
* Implementation Plan
|
||
|
||
** Phase 1: Library Mixing (Core)
|
||
|
||
1. =dj-session.lisp= — session lifecycle, deck state, crossfader math
|
||
2. API endpoints in =asteroid.lisp= — session/deck/crossfader control
|
||
3. =stream-harmony.lisp= — pause/resume auto-playlist on session start/end
|
||
4. =template/dj-console.ctml= — dual-deck UI with library browser
|
||
5. =parenscript/dj-console.lisp= — polling, controls, search
|
||
6. Navigation and ASDF updates
|
||
|
||
** Phase 2: External Audio Input
|
||
|
||
7. Local audio capture via cl-mixed-pulse or cl-mixed-alsa
|
||
8. Network audio input — accept Icecast source protocol connections
|
||
9. External input UI in the DJ console
|
||
10. Hybrid mixing (decks + external simultaneously)
|
||
|
||
** Phase 3: Polish
|
||
|
||
11. Waveform display (decode audio ahead of time, render waveform in canvas)
|
||
12. Cue points / hot cues
|
||
13. BPM detection and sync
|
||
14. Effects (EQ, filter, reverb via cl-mixed effects chain)
|
||
15. Session recording (save the mixed output to a file)
|
||
16. Chat / talkback between DJ and listeners
|
||
|
||
* Open Questions
|
||
|
||
1. *Monitoring / cue preview*: Should the DJ be able to preview a
|
||
track in headphones before pushing it live? This would require a
|
||
second audio output (local sound card) separate from the streaming
|
||
drain. Possible with Harmony but adds complexity.
|
||
|
||
2. *Concurrent sessions*: Do we ever want multiple DJs? (e.g., back-
|
||
to-back sets with handover). For now, single session is simpler.
|
||
|
||
3. *Network input protocol*: Icecast source protocol is the most
|
||
compatible with existing DJ software. Should we also support SRT
|
||
for lower latency?
|
||
|
||
4. *Latency*: The current pipeline has ~50ms latency (Harmony's
|
||
buffer) plus encoding time. For remote DJ monitoring this is fine.
|
||
For local DJ monitoring with headphones, we may want a direct
|
||
monitor path that bypasses encoding.
|
||
|
||
5. *Recording*: Should DJ sets be recorded to disk automatically?
|
||
Could write the raw PCM or a high-quality FLAC alongside the
|
||
encoded streams.
|