From 3e9f9b12fc7104cde2ba141c95ae9eaa99614330 Mon Sep 17 00:00:00 2001
From: Eddy Pedroni <epedroni@pm.me>
Date: Thu, 22 Oct 2026 22:34:17 +0200
Subject: Multitrack support in the library

---
 solo-tool-project/src/solo_tool/player_mpv.py | 48 +++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)

(limited to 'solo-tool-project/src/solo_tool/player_mpv.py')

diff --git a/solo-tool-project/src/solo_tool/player_mpv.py b/solo-tool-project/src/solo_tool/player_mpv.py
index 58902e0..77e0651 100644
--- a/solo-tool-project/src/solo_tool/player_mpv.py
+++ b/solo-tool-project/src/solo_tool/player_mpv.py
@@ -1,13 +1,45 @@
 import mpv
 
+def _complexGraph(tracks):
+    graph = ""
+    for i, enabled in tracks.items():
+        graph += f"[aid{i}]volume={"1.0" if enabled else "0.0"}[a{i}];"
+    graph += "[a1][a2][a3][a4][a5][a6]amix=inputs=6:"
+    graph += "duration=longest:normalize=0[ao]"
+    return graph
+
+def _simpleGraph():
+    return (
+        "[aid1]volume=1.0[a1];"
+        "[a1]amix=inputs=1:"
+        "duration=longest:normalize=1[ao]"
+    )
+
 class Player:
+    VOCAL_TRACK = 1
+    GUITAR_TRACK = 2
+    BASS_TRACK = 3
+    PIANO_TRACK =4
+    DRUM_TRACK = 5
+    OTHER_TRACK = 6
+
     def __init__(self):
         self._player = mpv.MPV(ao="jack")
         self._player.loop = "inf"
+        self._player.lavfi_complex = _simpleGraph()
         self._playingStateCallback = self._dummyCallback
         self._volumeCallback = self._dummyCallback
         self._player.observe_property("pause", lambda name, value: self._playingStateCallback())
         self._player.observe_property("volume", lambda name, value: self._volumeCallback())
+        self._player.observe_property("track-list/count", lambda name, value: self._updateGraph())
+        self._tracks = {
+            self.VOCAL_TRACK: True,
+            self.GUITAR_TRACK: True,
+            self.BASS_TRACK: True,
+            self.PIANO_TRACK: True,
+            self.DRUM_TRACK: True,
+            self.OTHER_TRACK: True 
+        }
 
     def __del__(self):
         self._player.close()
@@ -15,6 +47,12 @@ class Player:
     def _dummyCallback(self):
         pass
 
+    def _updateGraph(self):
+        if self.tracksSupported():
+            self._player.lavfi_complex = _complexGraph(self._tracks)
+        else:
+            self._player.lavfi_complex = _simpleGraph()
+
     def play(self):
         self._player.pause = False
 
@@ -51,3 +89,13 @@ class Player:
 
     def setPlaybackVolumeChangedCallback(self, callback):
         self._volumeCallback = callback
+
+    def tracksSupported(self):
+        return len(self._player.track_list) == 6
+
+    def trackEnabled(self, trackId):
+        return self._tracks[trackId]
+
+    def setTrackEnabled(self, trackId, enable):
+        self._tracks[trackId] = enable
+        self._updateGraph()
-- 
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