Record a meeting from both sides, and write its minutes

Who said what is the hard part of a meeting transcript, and the usual answer
is to hand one mixed recording to a model and ask it to tell the voices apart.
That guess is wrong often enough to be worse than useless in minutes, where a
decision attributed to the wrong person is a decision nobody made.

So the question never reaches a model. ffmpeg records the microphone and the
default sink's monitor as one stereo stream, you on the left and everyone else
on the right, and one process reading both is what keeps them aligned over an
hour. Each channel is transcribed on its own and the two are interleaved on a
single timeline, so attribution is settled by the wire a voice arrived on.
What a microphone picks up from the speakers lands on both channels; our copy
is dropped when it overlaps theirs in time and says nearly the same thing.

The stream is written to disk as it arrives rather than held in memory, so
length costs nothing and a crash costs the tail instead of the whole meeting.
Every stage the run reaches is recorded in meetings.jsonl, so a failure while
summarising does not throw away the transcription of an hour of audio: the
retry reads the transcript back out of the document and picks up from there.
A run that dies keeps its recording whether or not audio is being kept.

The minutes model is configured on its own, under Settings, with its own
prompt, and it is told who was expected in the room so the names come out
spelled right. It is told outright that the transcript is a record of other
people talking, not instructions addressed to it.

The built-in listener now holds several bindings rather than one, and the KDE
side is parameterised by desktop id, so the meeting toggle gets a shortcut of
its own on the same footing as the dictation one.

dikte.py

@@ -5,6 +5,8 @@ Usage:
   dikte.py               run in the background (tray icon)
   dikte.py toggle        start / stop recording
   dikte.py cancel        discard the current recording
+  dikte.py meeting       start / end a meeting recording
+  dikte.py meeting-cancel  discard the meeting being recorded
   dikte.py settings      open the settings window
   dikte.py restart       reload the running instance
   dikte.py quit          shut the application down
@@ -26,30 +28,46 @@ from PyQt6.QtWidgets import QApplication, QMenu, QSystemTrayIcon  # noqa: E402
 import audio  # noqa: E402
 import config as cfg  # noqa: E402
 import hotkey  # noqa: E402
+import meeting  # noqa: E402
 from i18n import t  # noqa: E402
+from meeting import MeetingPipeline  # noqa: E402
 from overlay import Overlay  # noqa: E402
 from settings_ui import SettingsWindow  # noqa: E402
 from worker import Pipeline  # noqa: E402
 
 SERVER_NAME = "dikte-" + str(os.getuid())
 IDLE, RECORDING, BUSY = "idle", "recording", "busy"
+# A meeting runs alongside dictation rather than through it: writing up an hour
+# of audio takes minutes, and dictation should not be held hostage to it.
+M_IDLE, M_RECORDING, M_WORKING = "idle", "recording", "working"
 
 # The KDE shortcut answers a key press by launching a whole Python process, so
 # its toggle lands well after the built-in listener has handled the same press.
 # Anything arriving inside this window is that echo, not a second press.
 ECHO_MS = 2000
 
+# How long the indicator stays up at the start of a meeting. Long enough to see
+# both halves of the waveform move, which is the one check that matters, and
+# short enough not to sit in the corner for the rest of the hour.
+PEEK_MS = 12000
+
 
 class Dikte:
     def __init__(self, app):
         self.app = app
         self.conf = cfg.Config()
         self.state = IDLE
+        self.meeting_state = M_IDLE
+        self.meeting_base = ""
+        self.meeting_message = ""
         self.settings_window = None
+        self._quitting = False
 
         self.overlay = Overlay(self.conf["overlay_corner"])
         self.recorder = audio.Recorder()
         self.pipeline = Pipeline(self.conf)
+        self.meeting_recorder = audio.MeetingRecorder()
+        self.meetings = MeetingPipeline(self.conf)
         self.evdev = hotkey.EvdevHotkey()
 
         self.recorder.level.connect(self.overlay.push_level)
@@ -58,15 +76,26 @@ class Dikte:
         self.pipeline.stage.connect(self.overlay.show_busy)
         self.pipeline.finished.connect(self._on_finished)
         self.pipeline.failed.connect(self._on_error)
+        self.meeting_recorder.levels.connect(self._on_meeting_levels)
+        self.meeting_recorder.stopped.connect(self._on_meeting_recorded)
+        self.meeting_recorder.died.connect(self._on_meeting_died)
+        self.meeting_recorder.failed.connect(self._on_meeting_error)
+        self.meetings.progress.connect(self._on_meeting_progress)
+        self.meetings.finished.connect(self._on_meeting_finished)
+        self.meetings.failed.connect(self._on_meeting_failed)
         self.evdev.triggered.connect(self._on_evdev)
         self.evdev.failed.connect(self._on_error)
 
         self.elapsed = QElapsedTimer()
+        self.meeting_elapsed = QElapsedTimer()
         self.last_toggle = QElapsedTimer()
-        self.last_evdev = QElapsedTimer()
+        self.last_evdev = {}
         self.ticker = QTimer()
         self.ticker.setInterval(100)
         self.ticker.timeout.connect(self._tick)
+        self.meeting_ticker = QTimer()
+        self.meeting_ticker.setInterval(500)
+        self.meeting_ticker.timeout.connect(self._meeting_tick)
 
         self.tray = QSystemTrayIcon()
         self._apply_settings()
@@ -88,6 +117,16 @@ class Dikte:
         self.menu.addAction(self.cancel_action)
         self.menu.addSeparator()
 
+        self.meeting_action = QAction(t("Record a meeting"), self.menu)
+        self.meeting_action.triggered.connect(self._toggle_meeting)
+        self.menu.addAction(self.meeting_action)
+
+        self.meeting_cancel_action = QAction(t("Discard the meeting"), self.menu)
+        self.meeting_cancel_action.triggered.connect(self.cancel_meeting)
+        self.meeting_cancel_action.setEnabled(False)
+        self.menu.addAction(self.meeting_cancel_action)
+        self.menu.addSeparator()
+
         self.settings_action = QAction(t("Settings…"), self.menu)
         self.settings_action.triggered.connect(self.open_settings)
         self.menu.addAction(self.settings_action)
@@ -120,15 +159,45 @@ class Dikte:
 
     def _set_state(self, state):
         self.state = state
+        self._refresh_tray()
+
+    def _set_meeting_state(self, state):
+        self.meeting_state = state
+        if state != M_WORKING:
+            self.meeting_message = ""
+        self._refresh_tray()
+
+    def _refresh_tray(self):
         labels = {
             IDLE: ("Start recording", "audio-input-microphone", "Dikte: ready"),
             RECORDING: ("Stop and transcribe", "media-record", "Dikte: recording"),
             BUSY: ("Working…", "view-refresh", "Dikte: working"),
         }
-        label, icon, tip = labels[state]
+        label, icon, tip = labels[self.state]
         self.toggle_action.setText(t(label))
-        self.toggle_action.setEnabled(state != BUSY)
-        self.cancel_action.setEnabled(state == RECORDING)
+        self.toggle_action.setEnabled(self.state != BUSY)
+        self.cancel_action.setEnabled(self.state == RECORDING)
+
+        meeting_labels = {
+            M_IDLE: "Record a meeting",
+            M_RECORDING: "End the meeting and write it up",
+            M_WORKING: "Writing the meeting up…",
+        }
+        self.meeting_action.setText(t(meeting_labels[self.meeting_state]))
+        self.meeting_action.setEnabled(self.meeting_state != M_WORKING)
+        self.meeting_cancel_action.setEnabled(self.meeting_state == M_RECORDING)
+
+        # Dictation owns the icon while it is doing something, because it is the
+        # one you are waiting on; otherwise the meeting gets to speak.
+        if self.state == IDLE and self.meeting_state != M_IDLE:
+            if self.meeting_state == M_RECORDING:
+                icon, tip = "media-record", t("Dikte: in a meeting")
+            else:
+                icon = "view-refresh"
+                tip = self.meeting_message or t("Dikte: writing the meeting up")
+            self._set_icon(icon)
+            self.tray.setToolTip(tip)
+            return
         self._set_icon(icon)
         self.tray.setToolTip(t(tip))
 
@@ -136,20 +205,29 @@ class Dikte:
 
     def toggle(self):
         """A toggle from outside this process: the KDE shortcut, or the CLI."""
+        self._external("toggle", self._toggle)
+
+    def toggle_meeting(self):
+        self._external("meeting", self._toggle_meeting)
+
+    def _external(self, name, handler):
         # The built-in listener sees the key press the instant it happens, so a
         # toggle arriving right behind one is the KDE shortcut catching up on
         # that same press. Its lateness is also the proof we were waiting for
         # that the shortcut is live, which leaves the listener with nothing to
         # do but double every press.
-        if (self.evdev.running and self.last_evdev.isValid()
-                and self.last_evdev.elapsed() < ECHO_MS):
+        timer = self.last_evdev.get(name)
+        if self.evdev.running and timer is not None and timer.elapsed() < ECHO_MS:
             self._retire_listener()
             return
-        self._toggle()
+        handler()
 
-    def _on_evdev(self):
-        self.last_evdev.restart()
-        self._toggle()
+    def _on_evdev(self, name):
+        timer = self.last_evdev.get(name)
+        if timer is None:
+            timer = self.last_evdev[name] = QElapsedTimer()
+        timer.restart()
+        (self._toggle_meeting if name == "meeting" else self._toggle)()
 
     def _retire_listener(self):
         self.evdev.stop()
@@ -206,6 +284,135 @@ class Dikte:
         if seconds >= self.conf["max_seconds"]:
             self.stop()
 
+    # ---- meetings ---------------------------------------------------------
+
+    def _toggle_meeting(self):
+        if self.meeting_state == M_IDLE:
+            self.start_meeting()
+        elif self.meeting_state == M_RECORDING:
+            self.stop_meeting()
+
+    def start_meeting(self):
+        if self.meeting_state != M_IDLE:
+            return
+        base = meeting.new_base()
+        _, wav_path = cfg.meeting_paths(base)
+        self.meeting_recorder.start(
+            str(wav_path),
+            self.conf["meeting_mic_target"] or self.conf["mic_target"],
+            self.conf["meeting_system_target"],
+            self.conf["meeting_max_seconds"],
+        )
+        if not self.meeting_recorder.active:
+            return  # start() has already said what went wrong
+        self.meeting_base = base
+        self.meeting_elapsed.restart()
+        self.meeting_ticker.start()
+        self.overlay.show_meeting()
+        QTimer.singleShot(PEEK_MS, self._conceal_meeting_overlay)
+        self._set_meeting_state(M_RECORDING)
+
+    def stop_meeting(self):
+        if self.meeting_state != M_RECORDING:
+            return
+        self.meeting_ticker.stop()
+        self._set_meeting_state(M_WORKING)
+        self.overlay.show_busy(t("Ending the meeting…"))
+        self.meeting_recorder.stop()
+
+    def cancel_meeting(self):
+        if self.meeting_state != M_RECORDING:
+            return
+        self.meeting_ticker.stop()
+        self.meeting_recorder.cancel()
+        if self.overlay.state == "meeting":
+            self.overlay.dismiss()
+        self._set_meeting_state(M_IDLE)
+
+    def _conceal_meeting_overlay(self):
+        if self.overlay.state == "meeting":
+            self.overlay.dismiss()
+
+    def _on_meeting_levels(self, mine, theirs):
+        self.overlay.push_levels(mine, theirs)
+
+    def _meeting_tick(self):
+        seconds = self.meeting_elapsed.elapsed() / 1000.0
+        if self.overlay.state == "meeting":
+            self.overlay.set_seconds(seconds)
+        if self.state == IDLE:
+            self.tray.setToolTip(
+                t("Dikte: in a meeting ({time})", time=_clock(seconds))
+            )
+        if seconds >= self.conf["meeting_max_seconds"]:
+            self.stop_meeting()
+
+    def _on_meeting_recorded(self, path, duration):
+        entry = meeting.new_entry(self.meeting_base, duration)
+        try:
+            cfg.save_meeting(entry)
+        except OSError as exc:
+            self._on_meeting_failed(entry["base"], str(exc))
+            return
+        # On the way out there is no time to write anything up; the recording is
+        # on disk and listed, and the Minutes tab can pick it up next time.
+        if self._quitting:
+            return
+        if not self.meetings.run(entry):
+            self._set_meeting_state(M_IDLE)
+            self.tray.showMessage(
+                "Dikte",
+                t("Recording saved. The previous meeting is still being written "
+                  "up, so start this one from Settings → Minutes when it is done."),
+                QSystemTrayIcon.MessageIcon.Information, 10000,
+            )
+            return
+        self.overlay.show_done(t("Meeting recorded, writing it up…"), 4000)
+
+    def _on_meeting_progress(self, _base, message):
+        self.meeting_message = message
+        if self.state == IDLE and self.meeting_state == M_WORKING:
+            self.tray.setToolTip(message)
+
+    def _on_meeting_finished(self, base, title):
+        self._set_meeting_state(M_IDLE)
+        doc_path, _ = cfg.meeting_paths(base)
+        self.overlay.show_done(t("Meeting written up: {title}", title=title), 5000)
+        self.tray.showMessage(
+            t("Dikte: the meeting is written up"), f"{title}\n{doc_path}",
+            QSystemTrayIcon.MessageIcon.Information, 10000,
+        )
+
+    def _on_meeting_failed(self, _base, error):
+        self._set_meeting_state(M_IDLE)
+        first_line = error.strip().splitlines()[0]
+        self.overlay.show_error(t("Meeting failed: {error}", error=first_line))
+        self.tray.showMessage(
+            t("Dikte: the meeting could not be written up"),
+            t("{error}\n\nThe recording has been kept. Settings → Minutes can "
+              "try again.", error=error),
+            QSystemTrayIcon.MessageIcon.Warning, 12000,
+        )
+
+    def _on_meeting_error(self, message):
+        """The recorder itself could not run."""
+        self.meeting_ticker.stop()
+        if self.overlay.state == "meeting":
+            self.overlay.dismiss()
+        self._set_meeting_state(M_IDLE)
+        self._on_error(message)
+
+    def _on_meeting_died(self):
+        if self.meeting_state != M_RECORDING:
+            return
+        self.tray.showMessage(
+            "Dikte",
+            t("The recording stopped on its own; the sound device may have gone "
+              "away. Keeping what was captured."),
+            QSystemTrayIcon.MessageIcon.Warning, 10000,
+        )
+        self.stop_meeting()
+
     def _on_recorded(self, wav_path, duration, rms_values):
         self.pipeline.run(wav_path, duration, rms_values)
 
@@ -240,7 +447,9 @@ class Dikte:
 
     def open_settings(self):
         if self.settings_window is None:
-            self.settings_window = SettingsWindow(self.conf, launch_command())
+            self.settings_window = SettingsWindow(
+                self.conf, launch_command(), meeting_command(), self.meetings
+            )
             self.settings_window.applied.connect(self._apply_settings)
             self.settings_window.finished.connect(self._settings_closed)
         self.settings_window.show()
@@ -254,9 +463,10 @@ class Dikte:
     def _apply_settings(self):
         self.overlay.corner = self.conf["overlay_corner"]
         self._build_tray()
-        self._set_state(self.state)
+        self._refresh_tray()
         if self.conf["evdev_hotkey"]:
-            self.evdev.start(self.conf["shortcut"])
+            self.evdev.start({"toggle": self.conf["shortcut"],
+                              "meeting": self.conf["meeting_shortcut"]})
         else:
             self.evdev.stop()
 
@@ -270,18 +480,35 @@ class Dikte:
         os.execv(sys.executable, [sys.executable, script])
 
     def shutdown(self):
+        self._quitting = True
         self.evdev.stop()
         if self.state == RECORDING:
             self.recorder.cancel()
+        # A meeting in progress is closed properly rather than thrown away: the
+        # WAV ends up valid and listed, ready to be written up after the restart.
+        if self.meeting_state == M_RECORDING:
+            self.meeting_ticker.stop()
+            self.meeting_recorder.stop()
         self.overlay.dismiss()
         self.tray.hide()
 
 
+def _clock(seconds):
+    minutes, secs = divmod(int(seconds), 60)
+    hours, minutes = divmod(minutes, 60)
+    return (f"{hours}:{minutes:02d}:{secs:02d}" if hours
+            else f"{minutes}:{secs:02d}")
+
+
 def launch_command():
     """The command the KDE shortcut will run."""
     return f"{sys.executable} {os.path.realpath(__file__)} toggle"
 
 
+def meeting_command():
+    return f"{sys.executable} {os.path.realpath(__file__)} meeting"
+
+
 def send_command(command, timeout=800):
     """Hand a command to the running instance; False when there is none."""
     socket = QLocalSocket()
@@ -300,7 +527,8 @@ def main():
     command = args[0] if args else ""
 
     if command and command not in ("toggle", "cancel", "settings", "restart",
-                                   "quit", "start", "stop"):
+                                   "quit", "start", "stop", "meeting",
+                                   "meeting-cancel"):
         print(__doc__)
         return 2
 
@@ -313,7 +541,7 @@ def main():
     if send_command(command or "settings"):
         return 0
 
-    if command in ("cancel", "quit", "stop", "restart"):
+    if command in ("cancel", "quit", "stop", "restart", "meeting-cancel"):
         return 0
 
     if not QSystemTrayIcon.isSystemTrayAvailable():
@@ -341,6 +569,8 @@ def main():
                 "start": dikte.start,
                 "stop": dikte.stop,
                 "cancel": dikte.cancel,
+                "meeting": dikte.toggle_meeting,
+                "meeting-cancel": dikte.cancel_meeting,
                 "settings": dikte.open_settings,
                 "restart": dikte.restart,
                 "quit": app.quit,
@@ -360,6 +590,8 @@ def main():
         dikte.open_settings()
     elif command == "toggle":
         QTimer.singleShot(0, dikte.toggle)
+    elif command == "meeting":
+        QTimer.singleShot(0, dikte.toggle_meeting)
 
     return app.exec()