297 lines
13 KiB
Common Lisp
297 lines
13 KiB
Common Lisp
;;;; stream-harmony.lisp - CL-Streamer / Harmony integration for Asteroid Radio
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;;;; In-process audio streaming via Harmony + cl-streamer.
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;;;; Provides the same data interface to frontend-partials and admin APIs.
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(in-package :asteroid)
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;;; ---- Configuration ----
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(defvar *harmony-pipeline* nil
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"The active cl-streamer/harmony audio pipeline.")
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(defvar *harmony-stream-port* 8000
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"Port for the cl-streamer HTTP stream server.")
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;; Encoder instances are now owned by the pipeline (Phase 2).
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;; Kept as aliases for backward compatibility with any external references.
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(defun harmony-mp3-encoder ()
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"Get the MP3 encoder from the pipeline (if running)."
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(when *harmony-pipeline*
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(car (find "/asteroid.mp3" (cl-streamer/harmony:pipeline-encoders *harmony-pipeline*)
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:key #'cdr :test #'string=))))
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(defun harmony-aac-encoder ()
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"Get the AAC encoder from the pipeline (if running)."
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(when *harmony-pipeline*
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(car (find "/asteroid.aac" (cl-streamer/harmony:pipeline-encoders *harmony-pipeline*)
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:key #'cdr :test #'string=))))
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(defvar *harmony-state-file*
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(merge-pathnames ".playback-state.lisp" (asdf:system-source-directory :asteroid))
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"File to persist current playback position across restarts.")
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;;; ---- Playback State Persistence ----
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(defvar *current-playlist-path* nil
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"Path of the currently active playlist file.")
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(defvar *resumed-from-saved-state* nil
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"Set to T when startup successfully resumed from saved playback state.
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Prevents the scheduler from overwriting the resumed position.")
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(defun save-playback-state (track-file-path)
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"Save the current track file path and playlist to the state file.
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Called on each track change so we can resume after restart."
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(handler-case
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(with-open-file (s *harmony-state-file*
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:direction :output
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:if-exists :supersede
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:if-does-not-exist :create)
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(prin1 (list :track-file track-file-path
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:playlist (when *current-playlist-path*
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(namestring *current-playlist-path*))
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:timestamp (get-universal-time))
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s))
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(error (e)
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(log:warn "Could not save playback state: ~A" e))))
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(defun load-playback-state ()
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"Load the saved playback state. Returns plist or NIL."
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(handler-case
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(when (probe-file *harmony-state-file*)
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(with-open-file (s *harmony-state-file* :direction :input)
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(read s nil nil)))
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(error (e)
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(log:warn "Could not load playback state: ~A" e)
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nil)))
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(defun resume-from-saved-state ()
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"Load saved playback state, resolve the correct playlist, and return
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(values file-list playlist-path) starting after the saved track.
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If the currently scheduled playlist differs from the saved one,
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uses the scheduled playlist from the beginning instead.
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Returns NIL if no state or playlist found."
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(let ((state (load-playback-state)))
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(when state
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(let* ((saved-file (getf state :track-file))
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(saved-playlist (getf state :playlist))
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(saved-playlist-name (when saved-playlist
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(file-namestring (pathname saved-playlist))))
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;; Check what should be playing right now
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(scheduled-name (get-current-scheduled-playlist))
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(scheduled-path (when scheduled-name
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(let ((p (merge-pathnames scheduled-name (get-playlists-directory))))
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(probe-file p))))
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;; If scheduled playlist differs from saved, use scheduled (start fresh)
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(playlist-changed-p (and scheduled-name saved-playlist-name
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(not (string= scheduled-name saved-playlist-name))))
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(playlist-path (if playlist-changed-p
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scheduled-path
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(or (and saved-playlist
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(probe-file (pathname saved-playlist)))
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scheduled-path)))
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(file-list (when playlist-path
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(m3u-to-file-list playlist-path))))
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(when file-list
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(setf *current-playlist-path* playlist-path)
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(setf *resumed-from-saved-state* t)
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(if playlist-changed-p
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;; Different playlist should be active — start from beginning
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(progn
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(log:info "Scheduled playlist changed: ~A -> ~A, starting from beginning"
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saved-playlist-name scheduled-name)
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(values file-list playlist-path))
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;; Same playlist — resume from saved position
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(let ((pos (when saved-file
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(position saved-file file-list :test #'string=))))
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(if pos
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(let ((remaining (nthcdr (1+ pos) file-list)))
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(if remaining
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(progn
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(log:info "Resuming after track ~A (~A of ~A) from ~A"
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(file-namestring saved-file) (1+ pos) (length file-list)
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(file-namestring playlist-path))
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(values remaining playlist-path))
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(progn
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(log:info "Last saved track was final, restarting ~A"
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(file-namestring playlist-path))
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(values file-list playlist-path))))
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(progn
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(log:info "Saved track not found, starting ~A from beginning"
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(file-namestring playlist-path))
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(values file-list playlist-path))))))))))
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;;; ---- M3U Playlist Loading ----
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(defun m3u-to-file-list (m3u-path)
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"Parse an M3U playlist file and return a list of host file paths.
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Converts Docker paths (/app/music/...) back to host paths.
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Skips comment lines and blank lines."
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(when (probe-file m3u-path)
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(with-open-file (stream m3u-path :direction :input)
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(loop for line = (read-line stream nil)
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while line
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for trimmed = (string-trim '(#\Space #\Tab #\Return #\Newline) line)
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unless (or (string= trimmed "")
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(and (> (length trimmed) 0) (char= (char trimmed 0) #\#)))
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collect (convert-from-docker-path trimmed)))))
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;;; ---- Track & Playlist Change Callbacks ----
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(defun on-harmony-playlist-change (pipeline playlist-path)
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"Called by cl-streamer when a scheduler playlist actually starts playing.
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Updates *current-playlist-path* only now, not at queue time."
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(declare (ignore pipeline))
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(setf *current-playlist-path* playlist-path)
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(log:info "Playlist now active: ~A" (file-namestring playlist-path)))
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(defun on-harmony-track-change (pipeline track-info)
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"Called by cl-streamer when a track changes.
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Updates recently-played lists and finds the track in the database."
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(declare (ignore pipeline))
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(let* ((display-title (getf track-info :display-title))
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(artist (getf track-info :artist))
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(title (getf track-info :title))
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(file-path (getf track-info :file))
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(track-id (or (find-track-by-title display-title)
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(find-track-by-file-path file-path))))
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(when (and display-title
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(not (string= display-title "Unknown")))
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;; Update recently played (curated stream)
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(add-recently-played (list :title display-title
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:artist artist
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:song title
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:timestamp (get-universal-time)
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:track-id track-id)
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:curated)
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(setf *last-known-track-curated* display-title))
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;; Persist current track for resume-on-restart
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(when file-path
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(save-playback-state file-path))
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(log:info "Track change: ~A (track-id: ~A)" display-title track-id)))
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(defun find-track-by-file-path (file-path)
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"Find a track in the database by file path. Returns track ID or nil."
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(when file-path
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(handler-case
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(with-db
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(postmodern:query
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(:limit
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(:select '_id :from 'tracks
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:where (:= 'file-path file-path))
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1)
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:single))
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(error () nil))))
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;;; ---- Now-Playing Data Source ----
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;;; These functions provide now-playing data from cl-streamer's pipeline state.
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(defun harmony-now-playing (&optional (mount "asteroid.mp3"))
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"Get now-playing information from cl-streamer pipeline.
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Returns an alist with now-playing data, or NIL if the pipeline is not running."
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(when (and *harmony-pipeline*
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(cl-streamer/harmony:pipeline-current-track *harmony-pipeline*))
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(let* ((track-info (cl-streamer/harmony:pipeline-current-track *harmony-pipeline*))
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(display-title (or (getf track-info :display-title) "Unknown"))
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(listeners (cl-streamer:pipeline-listener-count *harmony-pipeline*))
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(track-id (or (find-track-by-title display-title)
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(find-track-by-file-path (getf track-info :file)))))
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`((:listenurl . ,(format nil "~A/~A" *stream-base-url* mount))
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(:title . ,display-title)
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(:listeners . ,(or listeners 0))
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(:track-id . ,track-id)
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(:favorite-count . ,(or (get-track-favorite-count display-title) 0))))))
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;;; ---- Pipeline Lifecycle ----
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(defun start-harmony-streaming (&key (port *harmony-stream-port*)
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(mp3-bitrate 128)
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(aac-bitrate 128))
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"Start the cl-streamer pipeline with MP3 and AAC outputs.
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Should be called once during application startup.
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MP3-BITRATE and AAC-BITRATE are in kbps (e.g. 128)."
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(when *harmony-pipeline*
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(log:warn "Harmony streaming already running")
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(return-from start-harmony-streaming *harmony-pipeline*))
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;; Create pipeline from declarative spec — server, mounts, encoders all handled
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(setf *harmony-pipeline*
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(cl-streamer/harmony:make-pipeline
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:port port
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:outputs (list (list :format :mp3
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:mount "/asteroid.mp3"
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:bitrate mp3-bitrate
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:name "Asteroid Radio MP3")
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(list :format :aac
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:mount "/asteroid.aac"
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:bitrate aac-bitrate
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:name "Asteroid Radio AAC"))))
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;; Register hooks
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(cl-streamer/harmony:pipeline-add-hook *harmony-pipeline*
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:track-change #'on-harmony-track-change)
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(cl-streamer/harmony:pipeline-add-hook *harmony-pipeline*
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:playlist-change #'on-harmony-playlist-change)
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;; Start the audio pipeline
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(cl-streamer/harmony:pipeline-start *harmony-pipeline*)
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(log:info "Harmony streaming started on port ~A (MP3 + AAC)" port)
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*harmony-pipeline*)
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(defun stop-harmony-streaming ()
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"Stop the cl-streamer pipeline and stream server.
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Pipeline owns encoders and server — cleanup is automatic."
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(when *harmony-pipeline*
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(cl-streamer/harmony:pipeline-stop *harmony-pipeline*)
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(setf *harmony-pipeline* nil))
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(log:info "Harmony streaming stopped"))
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;;; ---- Playlist Control ----
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(defun harmony-load-playlist (m3u-path &key (skip nil))
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"Load and start playing an M3U playlist through the Harmony pipeline.
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Converts Docker paths to host paths and feeds them to play-list.
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When SKIP is T, immediately crossfade to the new playlist.
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When SKIP is NIL (default), queue tracks to play after the current track."
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(when *harmony-pipeline*
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(let ((file-list (m3u-to-file-list m3u-path)))
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(when file-list
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;; Store pending playlist path on pipeline — it will be applied
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;; when drain-queue-into-remaining fires and the new tracks
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;; actually start playing, not now at queue time.
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(setf (cl-streamer/harmony:pipeline-pending-playlist-path *harmony-pipeline*)
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(pathname m3u-path))
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;; Clear any existing queue and load new files
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(cl-streamer/harmony:pipeline-clear-queue *harmony-pipeline*)
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(cl-streamer/harmony:pipeline-queue-files *harmony-pipeline*
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(mapcar (lambda (path)
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(list :file path))
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file-list))
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;; Only skip if explicitly requested
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(when skip
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(cl-streamer/harmony:pipeline-skip *harmony-pipeline*))
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(log:info "Loaded playlist ~A (~A tracks)" (file-namestring m3u-path) (length file-list))
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(length file-list)))))
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(defun harmony-skip-track ()
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"Skip the current track (crossfades to next)."
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(when *harmony-pipeline*
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(cl-streamer/harmony:pipeline-skip *harmony-pipeline*)
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t))
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(defun harmony-get-status ()
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"Get current pipeline status."
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(if *harmony-pipeline*
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(let ((track (cl-streamer/harmony:pipeline-current-track *harmony-pipeline*))
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(listeners (cl-streamer:pipeline-listener-count *harmony-pipeline*)))
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(list :running t
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:current-track (getf track :display-title)
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:artist (getf track :artist)
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:title (getf track :title)
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:album (getf track :album)
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:listeners listeners
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:queue-length (length (cl-streamer/harmony:pipeline-get-queue
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*harmony-pipeline*))))
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(list :running nil)))
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