add root readme

cht/config.py

@@ -35,3 +35,16 @@ TRANSCRIBE_LINES_PER_GROUP = 3 # whisper segments grouped per transcript ID (1-5
 # Agent settings
 AGENT_PERMISSION_MODE = "bypassPermissions"  # default|acceptEdits|plan|bypassPermissions|dontAsk
 AGENT_MAX_TURNS = 5
+
+# Offline summarization (post-session diarization + export)
+# whisperx lives in its own venv to avoid dep clashes with cht's faster_whisper.
+# Defaults mirror transcribe_oneoff.sh: large-v3 + int8 fits in ~3-4 GB VRAM and
+# is less hallucination-prone than medium on long meetings.
+WHISPERX_BIN = os.environ.get("CHT_WHISPERX_BIN", "/home/mariano/wdir/venv/def/bin/whisperx")
+WHISPERX_MODEL = os.environ.get("CHT_WHISPERX_MODEL", "large-v3")
+WHISPERX_DEVICE = os.environ.get("CHT_WHISPERX_DEVICE", "cuda")
+WHISPERX_COMPUTE_TYPE = os.environ.get("CHT_WHISPERX_COMPUTE_TYPE", "int8")
+WHISPERX_BATCH_SIZE = int(os.environ.get("CHT_WHISPERX_BATCH_SIZE", "4"))
+HF_TOKEN = os.environ.get("HF_TOKEN")  # required for pyannote diarization
+DEFAULT_PARTICIPANTS = 2
+WHISPERX_LD_LIBRARY_PATH = os.environ.get("CHT_WHISPERX_LD_LIBRARY_PATH")  # cuDNN override

cht/summary/__init__.py

@@ -0,0 +1,5 @@
+"""Post-session summarization pipeline.
+
+Offline diarization (whisperx) + transcript/frame merger producing a clean
+LLM-ready `<session>_enhanced.txt`.
+"""

cht/summary/audio.py

@@ -0,0 +1,98 @@
+"""Assemble a single WAV file covering the entire session audio.
+
+Prefers the recording source (fMP4 or raw AAC) over the live-extracted
+WAV chunks: a single decode pass gives whisperx contiguous audio with no
+chunk-boundary artifacts. Chunks are a fallback when the recording source
+is missing.
+"""
+
+import logging
+import tempfile
+from pathlib import Path
+
+import ffmpeg
+
+from cht.stream import ffmpeg as ff
+
+log = logging.getLogger(__name__)
+
+
+def assemble_session_wav(session_dir: Path, *, force: bool = False) -> Path:
+    """Build `summary/full.wav` covering the whole session audio.
+
+    Returns the cached path if already present and `force` is False.
+    Raises FileNotFoundError if no usable audio source exists.
+    """
+    summary_dir = session_dir / "summary"
+    summary_dir.mkdir(parents=True, exist_ok=True)
+    out = summary_dir / "full.wav"
+    if out.exists() and not force:
+        log.info("assemble_session_wav: cached %s", out)
+        return out
+
+    stream_dir = session_dir / "stream"
+
+    # 1. Rust transport: standalone audio.aac.
+    aac = stream_dir / "audio.aac"
+    if aac.exists() and aac.stat().st_size > 100:
+        ff.extract_audio_chunk(aac, out)
+        log.info("assemble_session_wav: from audio.aac → %s", out)
+        return out
+
+    # 2. fMP4 segments (Python transport). Single segment is the common case.
+    segments = sorted(stream_dir.glob("recording_*.mp4")) if stream_dir.exists() else []
+    if len(segments) == 1:
+        ff.extract_audio_chunk(segments[0], out)
+        log.info("assemble_session_wav: from %s → %s", segments[0].name, out)
+        return out
+    if len(segments) > 1:
+        _concat_segments_audio(segments, out)
+        log.info("assemble_session_wav: concatenated %d segments → %s", len(segments), out)
+        return out
+
+    # 3. Fallback: concat the live audio chunks. Last resort — chunk seams may
+    # introduce minor artifacts; whisperx still works but precision can suffer.
+    audio_dir = session_dir / "audio"
+    chunks = sorted(audio_dir.glob("chunk_*.wav")) if audio_dir.exists() else []
+    if chunks:
+        log.warning("assemble_session_wav: no recording source, falling back to %d chunks", len(chunks))
+        _concat_chunks(chunks, out)
+        return out
+
+    raise FileNotFoundError(f"No audio source found in {session_dir}")
+
+
+def _concat_segments_audio(segments: list[Path], out: Path) -> None:
+    """Decode + concatenate audio tracks from multiple fMP4 segments into 16kHz mono WAV."""
+    inputs = [ffmpeg.input(str(p)) for p in segments]
+    audio_streams = [s.audio for s in inputs]
+    node = (
+        ffmpeg.concat(*audio_streams, v=0, a=1)
+        .output(str(out), acodec="pcm_s16le", ac=1, ar=16000)
+        .overwrite_output()
+        .global_args("-hide_banner", "-loglevel", "warning")
+    )
+    log.info("concat_segments_audio: %s", " ".join(node.compile()))
+    node.run(capture_stdout=True, capture_stderr=True)
+
+
+def _concat_chunks(chunks: list[Path], out: Path) -> None:
+    """Concat already-PCM 16kHz mono WAV files via the concat demuxer (no re-decode)."""
+    with tempfile.NamedTemporaryFile("w", suffix=".txt", delete=False) as f:
+        listfile = Path(f.name)
+        for c in chunks:
+            f.write(f"file '{c.resolve()}'\n")
+    try:
+        node = (
+            ffmpeg.input(str(listfile), format="concat", safe=0)
+            .output(str(out), c="copy")
+            .overwrite_output()
+            .global_args("-hide_banner", "-loglevel", "warning")
+        )
+        log.info("concat_chunks: %s", " ".join(node.compile()))
+        node.run(capture_stdout=True, capture_stderr=True)
+    finally:
+        try:
+            listfile.unlink()
+        except OSError:
+            pass

cht/summary/diarize.py

@@ -0,0 +1,102 @@
+"""WhisperX subprocess wrapper for offline diarized transcription.
+
+Runs whisperx CLI on a full-session WAV file, with min/max speakers pinned
+to the user-provided count. Streams stderr to a progress callback. Loads the
+resulting JSON and returns it.
+"""
+
+import json
+import logging
+import os
+import subprocess
+import threading
+from pathlib import Path
+
+from cht import config
+
+log = logging.getLogger(__name__)
+
+
+def _cudnn_lib_for(whisperx_bin: str) -> str | None:
+    """Find nvidia/cudnn/lib inside the venv that owns *whisperx_bin*.
+
+    whisperx ships with `nvidia-cudnn-cu12`; the runtime needs the .so files
+    on LD_LIBRARY_PATH or it dies with a missing-symbol error.
+    """
+    bin_path = Path(whisperx_bin).resolve()
+    venv_root = bin_path.parent.parent  # .../venv/def
+    if not venv_root.exists():
+        return None
+    matches = list(venv_root.glob("lib/python*/site-packages/nvidia/cudnn/lib"))
+    return str(matches[0]) if matches else None
+
+
+def run_whisperx(
+    wav_path: Path,
+    output_dir: Path,
+    *,
+    num_speakers: int,
+    on_progress=None,
+) -> dict:
+    """Run whisperx diarization on `wav_path`. Returns parsed JSON.
+
+    Writes whisperx outputs into `output_dir`. Caller is responsible for
+    persisting the relevant artifact elsewhere if desired.
+    """
+    if not config.HF_TOKEN:
+        raise RuntimeError(
+            "HF_TOKEN environment variable is required for whisperx diarization."
+        )
+    output_dir.mkdir(parents=True, exist_ok=True)
+
+    cmd = [
+        config.WHISPERX_BIN,
+        str(wav_path),
+        "--model", config.WHISPERX_MODEL,
+        "--device", config.WHISPERX_DEVICE,
+        "--compute_type", config.WHISPERX_COMPUTE_TYPE,
+        "--diarize",
+        "--min_speakers", str(num_speakers),
+        "--max_speakers", str(num_speakers),
+        "--hf_token", config.HF_TOKEN,
+        "--output_format", "json",
+        "--output_dir", str(output_dir),
+    ]
+
+    env = os.environ.copy()
+    cudnn_path = config.WHISPERX_LD_LIBRARY_PATH or _cudnn_lib_for(config.WHISPERX_BIN)
+    if cudnn_path:
+        env["LD_LIBRARY_PATH"] = cudnn_path + os.pathsep + env.get("LD_LIBRARY_PATH", "")
+
+    log.info("whisperx: %s", " ".join(c for c in cmd if c != config.HF_TOKEN))
+    if on_progress:
+        on_progress("whisperx: starting", None)
+
+    proc = subprocess.Popen(
+        cmd, env=env,
+        stdout=subprocess.PIPE, stderr=subprocess.STDOUT,
+        text=True, bufsize=1,
+    )
+
+    # Drain stderr/stdout combined; report progress lines.
+    def _drain():
+        for line in proc.stdout:
+            line = line.rstrip()
+            if not line:
+                continue
+            log.debug("[whisperx] %s", line)
+            if on_progress:
+                on_progress(line, None)
+
+    t = threading.Thread(target=_drain, daemon=True, name="whisperx_drain")
+    t.start()
+    proc.wait()
+    t.join(timeout=2)
+
+    if proc.returncode != 0:
+        raise RuntimeError(f"whisperx exited with status {proc.returncode}")
+
+    out_json = output_dir / f"{wav_path.stem}.json"
+    if not out_json.exists():
+        raise RuntimeError(f"whisperx finished but {out_json.name} not found")
+    return json.loads(out_json.read_text())

cht/summary/merger.py

@@ -0,0 +1,88 @@
+"""Interleave diarized audio segments with selected screen frames by timestamp.
+
+Direct port of mts/meetus/transcript_merger.py:merge_transcripts (line 162).
+"""
+
+import logging
+
+log = logging.getLogger(__name__)
+
+
+def merge(audio_segments: list[dict], frame_segments: list[dict],
+          name_map: dict[str, str] | None = None) -> list[dict]:
+    """Combine and group by speaker; screen frames break speaker groups.
+
+    `audio_segments`: each {timestamp, text, speaker?}.
+    `frame_segments`: each {timestamp, frame_path}.
+    `name_map`: optional SPEAKER_xx → real name remap, applied to outputs.
+    Returns merged list sorted by timestamp.
+    """
+    name_map = name_map or {}
+
+    audio = [{**s, "type": "audio"} for s in audio_segments]
+    screen = [{**s, "type": "screen"} for s in frame_segments]
+    all_segs = sorted(audio + screen, key=lambda x: x["timestamp"])
+
+    grouped: list[dict] = []
+    current = None
+
+    def _label(speaker):
+        if not speaker:
+            return None
+        return name_map.get(speaker, speaker)
+
+    for seg in all_segs:
+        if seg["type"] == "screen":
+            if current is not None:
+                grouped.append(current)
+                current = None
+            grouped.append(seg)
+            continue
+
+        speaker = _label(seg.get("speaker"))
+        if current is None:
+            current = {
+                "timestamp": seg["timestamp"],
+                "text": seg["text"],
+                "speaker": speaker,
+                "type": "audio",
+            }
+        elif speaker == current.get("speaker"):
+            current["text"] += " " + seg["text"]
+        else:
+            grouped.append(current)
+            current = {
+                "timestamp": seg["timestamp"],
+                "text": seg["text"],
+                "speaker": speaker,
+                "type": "audio",
+            }
+
+    if current is not None:
+        grouped.append(current)
+    return grouped
+
+
+def whisperx_to_audio_segments(diarized: dict) -> list[dict]:
+    """Convert whisperx JSON segments to the merger's audio format."""
+    out = []
+    for seg in diarized.get("segments", []):
+        text = (seg.get("text") or "").strip()
+        if not text:
+            continue
+        out.append({
+            "timestamp": float(seg.get("start", 0.0)),
+            "text": text,
+            "speaker": seg.get("speaker"),
+        })
+    return out
+
+
+def collect_speakers(diarized: dict) -> list[str]:
+    """Distinct SPEAKER_xx labels found in the diarization, sorted."""
+    seen = set()
+    for seg in diarized.get("segments", []):
+        sp = seg.get("speaker")
+        if sp:
+            seen.add(sp)
+    return sorted(seen)

cht/summary/output.py

@@ -0,0 +1,75 @@
+"""Format merged segments as a sequential LLM-ready transcript.
+
+Direct port of mts/meetus/transcript_merger.py:_format_detailed (line 249).
+"""
+
+import json
+import logging
+from pathlib import Path
+
+log = logging.getLogger(__name__)
+
+
+def format_detailed(merged_segments: list[dict], *, frames_relative_to: Path | None = None) -> str:
+    """Render the interleaved transcript.
+
+    If `frames_relative_to` is given, frame paths are rewritten relative to it.
+    """
+    lines = []
+    lines.append("=" * 80)
+    lines.append("ENHANCED MEETING TRANSCRIPT")
+    lines.append("Audio transcript + Screen frames")
+    lines.append("=" * 80)
+    lines.append("")
+
+    for seg in merged_segments:
+        ts = _format_timestamp(seg["timestamp"])
+        if seg["type"] == "audio":
+            speaker = seg.get("speaker") or "SPEAKER"
+            lines.append(f"[{ts}] {speaker}:")
+            lines.append(f"  {seg['text']}")
+            lines.append("")
+        else:
+            lines.append(f"[{ts}] SCREEN CONTENT:")
+            fp = seg.get("frame_path")
+            if fp:
+                if frames_relative_to is not None:
+                    try:
+                        fp = str(Path(fp).resolve().relative_to(frames_relative_to.resolve()))
+                    except ValueError:
+                        fp = str(fp)
+                else:
+                    fp = str(fp)
+                lines.append(f"  Frame: {fp}")
+            lines.append("")
+
+    return "\n".join(lines)
+
+
+def _format_timestamp(seconds: float) -> str:
+    seconds = int(seconds)
+    h, rem = divmod(seconds, 3600)
+    m, s = divmod(rem, 60)
+    if h:
+        return f"{h:02d}:{m:02d}:{s:02d}"
+    return f"{m:02d}:{s:02d}"
+
+
+def write_outputs(session_dir: Path, merged: list[dict], *, name: str | None = None) -> Path:
+    """Write `<name>_enhanced.txt` and `merged.json` under `session_dir/summary`.
+
+    Returns the path of the enhanced transcript.
+    """
+    summary_dir = session_dir / "summary"
+    summary_dir.mkdir(parents=True, exist_ok=True)
+    name = name or session_dir.name
+
+    text = format_detailed(merged, frames_relative_to=session_dir)
+    text_path = summary_dir / f"{name}_enhanced.txt"
+    text_path.write_text(text)
+
+    merged_path = summary_dir / "merged.json"
+    merged_path.write_text(json.dumps(merged, indent=2, default=str))
+
+    log.info("Wrote %s (%d entries)", text_path, len(merged))
+    return text_path

cht/summary/pipeline.py

@@ -0,0 +1,72 @@
+"""End-to-end orchestrator for the summarization export.
+
+Two operations:
+  diarize(...)   — heavy: assembles audio, runs whisperx, caches diarized.json.
+  export(...)    — cheap: merges cached diarization with selected frames and
+                   writes <session>_enhanced.txt. Re-run any time the user
+                   tweaks frame selection or speaker names.
+"""
+
+import json
+import logging
+from pathlib import Path
+
+from cht.session import load_frame_index
+from cht.summary import audio, diarize, merger, output
+
+log = logging.getLogger(__name__)
+
+
+def diarized_path(session_dir: Path) -> Path:
+    return session_dir / "summary" / "diarized.json"
+
+
+def has_diarization(session_dir: Path) -> bool:
+    return diarized_path(session_dir).exists()
+
+
+def load_diarization(session_dir: Path) -> dict:
+    return json.loads(diarized_path(session_dir).read_text())
+
+
+def run_diarization(session_dir: Path, *, num_speakers: int, on_progress=None) -> dict:
+    """Assemble audio, run whisperx, cache and return the JSON."""
+    if on_progress:
+        on_progress("assembling audio", 0.05)
+    wav = audio.assemble_session_wav(session_dir)
+
+    if on_progress:
+        on_progress("running whisperx", 0.15)
+    summary_dir = session_dir / "summary"
+    diarized = diarize.run_whisperx(
+        wav, summary_dir,
+        num_speakers=num_speakers,
+        on_progress=lambda line, _frac: on_progress(line, None) if on_progress else None,
+    )
+
+    diarized_path(session_dir).write_text(json.dumps(diarized, indent=2))
+    if on_progress:
+        on_progress("diarization done", 1.0)
+    return diarized
+
+
+def export(session_dir: Path,
+           *,
+           selected_frame_ids: set[str] | None = None,
+           name_map: dict[str, str] | None = None) -> Path:
+    """Merge cached diarization + selected frames and write enhanced.txt."""
+    if not has_diarization(session_dir):
+        raise RuntimeError("No diarization available — run diarization first.")
+    diarized = load_diarization(session_dir)
+    audio_segs = merger.whisperx_to_audio_segments(diarized)
+
+    frames = load_frame_index(session_dir / "frames")
+    if selected_frame_ids is not None:
+        frames = [f for f in frames if f["id"] in selected_frame_ids]
+    frame_segs = [
+        {"timestamp": f["timestamp"], "frame_path": str(f["path"])}
+        for f in frames
+    ]
+
+    merged = merger.merge(audio_segs, frame_segs, name_map=name_map)
+    return output.write_outputs(session_dir, merged)

cht/ui/summary_panel.py

@@ -0,0 +1,420 @@
+"""SummaryPanel: post-session export UI.
+
+Sits in a ViewStack page next to the live panels and is bound to a session
+directory after disconnect / readonly load. Lets the user:
+
+  1. Set participant count + run whisperx diarization (heavy, threaded).
+  2. Rename SPEAKER_xx to real names.
+  3. Curate which captured frames go into the enhanced transcript.
+  4. Export `<session>_enhanced.txt` (cheap; re-runnable on rename / reselection).
+"""
+
+import logging
+from pathlib import Path
+from threading import Thread
+
+import gi
+gi.require_version("Gtk", "4.0")
+gi.require_version("Adw", "1")
+gi.require_version("GdkPixbuf", "2.0")
+from gi.repository import Gtk, Gdk, GLib, Gio, Adw, Pango, GdkPixbuf, GObject
+
+from cht.config import DEFAULT_PARTICIPANTS
+from cht.session import load_frame_index
+from cht.summary import merger as summary_merger, pipeline as summary_pipeline
+
+log = logging.getLogger(__name__)
+
+
+class SummaryPanel(Gtk.Box):
+    """Post-session export controls."""
+
+    __gsignals__ = {
+        "status-changed": (GObject.SignalFlags.RUN_FIRST, None, (str,)),
+    }
+
+    def __init__(self, **kwargs):
+        super().__init__(orientation=Gtk.Orientation.VERTICAL, spacing=8, **kwargs)
+        self.set_margin_top(8)
+        self.set_margin_bottom(8)
+        self.set_margin_start(8)
+        self.set_margin_end(8)
+
+        self._session_dir: Path | None = None
+        self._diarized: dict | None = None
+        self._speaker_entries: dict[str, Gtk.Entry] = {}
+        self._frame_checks: dict[str, Gtk.CheckButton] = {}
+        self._busy = False
+
+        self._build_ui()
+        self._set_enabled(False)
+
+    # -- UI construction --
+
+    def _build_ui(self):
+        # Header
+        title = Gtk.Label(label="Session export")
+        title.add_css_class("title-3")
+        title.set_halign(Gtk.Align.START)
+        self.append(title)
+
+        self._session_label = Gtk.Label(label="No session bound")
+        self._session_label.add_css_class("dim-label")
+        self._session_label.set_halign(Gtk.Align.START)
+        self.append(self._session_label)
+
+        # --- Diarization box ---
+        diar_box = Gtk.Box(orientation=Gtk.Orientation.VERTICAL, spacing=4)
+        diar_box.add_css_class("card")
+        diar_box.set_margin_top(4)
+
+        diar_header = Gtk.Box(orientation=Gtk.Orientation.HORIZONTAL, spacing=8)
+        diar_header.set_margin_top(8)
+        diar_header.set_margin_bottom(4)
+        diar_header.set_margin_start(8)
+        diar_header.set_margin_end(8)
+
+        diar_header.append(Gtk.Label(label="Participants:"))
+        self._participants_spin = Gtk.SpinButton.new_with_range(1, 10, 1)
+        self._participants_spin.set_value(DEFAULT_PARTICIPANTS)
+        diar_header.append(self._participants_spin)
+
+        self._run_btn = Gtk.Button(label="Run diarization")
+        self._run_btn.add_css_class("suggested-action")
+        self._run_btn.connect("clicked", self._on_run_diarize)
+        diar_header.append(self._run_btn)
+
+        diar_box.append(diar_header)
+
+        self._progress = Gtk.ProgressBar()
+        self._progress.set_show_text(True)
+        self._progress.set_text("")
+        self._progress.set_margin_start(8)
+        self._progress.set_margin_end(8)
+        diar_box.append(self._progress)
+
+        self._status_label = Gtk.Label(label="")
+        self._status_label.set_halign(Gtk.Align.START)
+        self._status_label.set_wrap(True)
+        self._status_label.set_ellipsize(Pango.EllipsizeMode.END)
+        self._status_label.add_css_class("caption")
+        self._status_label.set_margin_start(8)
+        self._status_label.set_margin_end(8)
+        self._status_label.set_margin_bottom(8)
+        diar_box.append(self._status_label)
+
+        self.append(diar_box)
+
+        # --- Speakers + frames in a paned area for vertical scrolling ---
+        self._speakers_box = Gtk.Box(orientation=Gtk.Orientation.VERTICAL, spacing=4)
+        self._speakers_box.add_css_class("card")
+        self._speakers_box.set_margin_top(4)
+        speakers_header = Gtk.Label(label="Speaker names")
+        speakers_header.add_css_class("heading")
+        speakers_header.set_halign(Gtk.Align.START)
+        speakers_header.set_margin_top(8)
+        speakers_header.set_margin_start(8)
+        self._speakers_box.append(speakers_header)
+        self._speakers_list = Gtk.Box(orientation=Gtk.Orientation.VERTICAL, spacing=4)
+        self._speakers_list.set_margin_start(8)
+        self._speakers_list.set_margin_end(8)
+        self._speakers_list.set_margin_bottom(8)
+        self._speakers_box.append(self._speakers_list)
+        self.append(self._speakers_box)
+        self._speakers_box.set_visible(False)
+
+        # --- Frame picker ---
+        frames_card = Gtk.Box(orientation=Gtk.Orientation.VERTICAL, spacing=4)
+        frames_card.add_css_class("card")
+        frames_card.set_margin_top(4)
+        frames_card.set_vexpand(True)
+
+        frames_header = Gtk.Box(orientation=Gtk.Orientation.HORIZONTAL, spacing=8)
+        frames_header.set_margin_top(8)
+        frames_header.set_margin_start(8)
+        frames_header.set_margin_end(8)
+        frames_title = Gtk.Label(label="Frames")
+        frames_title.add_css_class("heading")
+        frames_header.append(frames_title)
+
+        self._frames_summary = Gtk.Label(label="")
+        self._frames_summary.add_css_class("dim-label")
+        frames_header.append(self._frames_summary)
+
+        spacer = Gtk.Box()
+        spacer.set_hexpand(True)
+        frames_header.append(spacer)
+
+        select_all_btn = Gtk.Button(label="Select all")
+        select_all_btn.add_css_class("flat")
+        select_all_btn.connect("clicked", lambda b: self._toggle_all_frames(True))
+        frames_header.append(select_all_btn)
+
+        deselect_all_btn = Gtk.Button(label="Deselect all")
+        deselect_all_btn.add_css_class("flat")
+        deselect_all_btn.connect("clicked", lambda b: self._toggle_all_frames(False))
+        frames_header.append(deselect_all_btn)
+
+        frames_card.append(frames_header)
+
+        scroll = Gtk.ScrolledWindow()
+        scroll.set_policy(Gtk.PolicyType.NEVER, Gtk.PolicyType.AUTOMATIC)
+        scroll.set_vexpand(True)
+        scroll.set_margin_start(8)
+        scroll.set_margin_end(8)
+        scroll.set_margin_bottom(8)
+        self._frames_flow = Gtk.FlowBox()
+        self._frames_flow.set_selection_mode(Gtk.SelectionMode.NONE)
+        self._frames_flow.set_max_children_per_line(8)
+        self._frames_flow.set_min_children_per_line(2)
+        self._frames_flow.set_homogeneous(True)
+        self._frames_flow.set_row_spacing(4)
+        self._frames_flow.set_column_spacing(4)
+        scroll.set_child(self._frames_flow)
+        frames_card.append(scroll)
+
+        self.append(frames_card)
+
+        # --- Export controls ---
+        export_box = Gtk.Box(orientation=Gtk.Orientation.HORIZONTAL, spacing=8)
+        export_box.set_margin_top(4)
+
+        self._export_btn = Gtk.Button(label="Export enhanced transcript")
+        self._export_btn.add_css_class("suggested-action")
+        self._export_btn.connect("clicked", self._on_export)
+        export_box.append(self._export_btn)
+
+        self._open_btn = Gtk.Button(label="Open output")
+        self._open_btn.connect("clicked", self._on_open_output)
+        self._open_btn.set_sensitive(False)
+        export_box.append(self._open_btn)
+
+        self._export_status = Gtk.Label(label="")
+        self._export_status.set_halign(Gtk.Align.START)
+        self._export_status.add_css_class("caption")
+        self._export_status.set_ellipsize(Pango.EllipsizeMode.END)
+        self._export_status.set_hexpand(True)
+        export_box.append(self._export_status)
+
+        self.append(export_box)
+
+    # -- Public API --
+
+    def bind_session(self, session_dir: Path | None):
+        """Attach the panel to a session directory (or None to clear)."""
+        self._session_dir = session_dir
+        self._diarized = None
+        self._speaker_entries.clear()
+        self._frame_checks.clear()
+        self._clear_widget(self._speakers_list)
+        self._clear_widget(self._frames_flow)
+        self._speakers_box.set_visible(False)
+        self._progress.set_fraction(0.0)
+        self._progress.set_text("")
+        self._status_label.set_text("")
+        self._export_status.set_text("")
+        self._open_btn.set_sensitive(False)
+        self._last_output: Path | None = None
+
+        if session_dir is None:
+            self._session_label.set_text("No session bound")
+            self._frames_summary.set_text("")
+            self._set_enabled(False)
+            return
+
+        self._session_label.set_text(f"Session: {session_dir.name}")
+        self._set_enabled(True)
+        self._load_frames()
+        # Reuse cached diarization if present.
+        if summary_pipeline.has_diarization(session_dir):
+            try:
+                self._diarized = summary_pipeline.load_diarization(session_dir)
+                self._populate_speakers()
+                self._status_label.set_text("Loaded cached diarization.")
+                self._progress.set_fraction(1.0)
+                self._progress.set_text("cached")
+            except Exception as e:
+                log.warning("Failed to load cached diarization: %s", e)
+
+    def set_streaming(self, streaming: bool):
+        """Disable the panel while a live session is running."""
+        self._set_enabled(not streaming and self._session_dir is not None)
+
+    # -- Diarization --
+
+    def _on_run_diarize(self, _btn):
+        if self._busy or not self._session_dir:
+            return
+        num_speakers = int(self._participants_spin.get_value())
+        self._busy = True
+        self._run_btn.set_sensitive(False)
+        self._export_btn.set_sensitive(False)
+        self._progress.set_fraction(0.05)
+        self._progress.set_text("starting…")
+        self._status_label.set_text("")
+
+        session_dir = self._session_dir
+
+        def _worker():
+            try:
+                def on_progress(line, frac):
+                    GLib.idle_add(self._update_progress, line, frac)
+                diarized = summary_pipeline.run_diarization(
+                    session_dir, num_speakers=num_speakers, on_progress=on_progress,
+                )
+                GLib.idle_add(self._on_diarize_done, diarized, None)
+            except Exception as e:
+                log.exception("Diarization failed")
+                GLib.idle_add(self._on_diarize_done, None, str(e))
+
+        Thread(target=_worker, daemon=True, name="diarize").start()
+
+    def _update_progress(self, line: str | None, frac: float | None):
+        if frac is not None:
+            self._progress.set_fraction(min(1.0, max(0.0, frac)))
+        else:
+            # Pulse mode if no fraction hint.
+            self._progress.pulse()
+        if line:
+            self._progress.set_text(_short(line, 40))
+            self._status_label.set_text(line)
+        return False
+
+    def _on_diarize_done(self, diarized: dict | None, err: str | None):
+        self._busy = False
+        self._run_btn.set_sensitive(True)
+        self._export_btn.set_sensitive(True)
+        if err:
+            self._progress.set_fraction(0.0)
+            self._progress.set_text("failed")
+            self._status_label.set_text(f"Error: {err}")
+            return False
+        self._progress.set_fraction(1.0)
+        self._progress.set_text("done")
+        self._diarized = diarized
+        speakers = summary_merger.collect_speakers(diarized) if diarized else []
+        self._status_label.set_text(
+            f"Diarization complete. Detected speakers: {', '.join(speakers) or '(none)'}"
+        )
+        self._populate_speakers()
+        return False
+
+    def _populate_speakers(self):
+        self._clear_widget(self._speakers_list)
+        self._speaker_entries.clear()
+        if not self._diarized:
+            self._speakers_box.set_visible(False)
+            return
+        speakers = summary_merger.collect_speakers(self._diarized)
+        if not speakers:
+            self._speakers_box.set_visible(False)
+            return
+        for sp in speakers:
+            row = Gtk.Box(orientation=Gtk.Orientation.HORIZONTAL, spacing=8)
+            label = Gtk.Label(label=sp)
+            label.set_width_chars(14)
+            label.set_xalign(0)
+            row.append(label)
+            entry = Gtk.Entry()
+            entry.set_placeholder_text(sp)
+            entry.set_hexpand(True)
+            row.append(entry)
+            self._speakers_list.append(row)
+            self._speaker_entries[sp] = entry
+        self._speakers_box.set_visible(True)
+
+    # -- Frame picker --
+
+    def _load_frames(self):
+        self._clear_widget(self._frames_flow)
+        self._frame_checks.clear()
+        if not self._session_dir:
+            return
+        frames = load_frame_index(self._session_dir / "frames")
+        for f in frames:
+            self._add_frame_thumb(f["id"], f["path"], f["timestamp"])
+        self._update_frames_summary()
+
+    def _add_frame_thumb(self, frame_id: str, path: Path, timestamp: float):
+        box = Gtk.Box(orientation=Gtk.Orientation.VERTICAL, spacing=2)
+        try:
+            pixbuf = GdkPixbuf.Pixbuf.new_from_file_at_scale(
+                str(path), 192, 108, True,
+            )
+            texture = Gdk.Texture.new_for_pixbuf(pixbuf)
+            pic = Gtk.Picture.new_for_paintable(texture)
+            pic.set_content_fit(Gtk.ContentFit.CONTAIN)
+            pic.set_size_request(192, 108)
+            box.append(pic)
+        except Exception as e:
+            log.debug("thumbnail load failed for %s: %s", path, e)
+            placeholder = Gtk.Label(label=frame_id)
+            placeholder.set_size_request(192, 108)
+            box.append(placeholder)
+
+        m, s = divmod(int(timestamp), 60)
+        check = Gtk.CheckButton(label=f"{frame_id} [{m:02d}:{s:02d}]")
+        check.set_active(True)
+        check.connect("toggled", lambda _b: self._update_frames_summary())
+        box.append(check)
+
+        self._frames_flow.append(box)
+        self._frame_checks[frame_id] = check
+
+    def _toggle_all_frames(self, value: bool):
+        for check in self._frame_checks.values():
+            check.set_active(value)
+
+    def _update_frames_summary(self):
+        total = len(self._frame_checks)
+        selected = sum(1 for c in self._frame_checks.values() if c.get_active())
+        self._frames_summary.set_text(f"{selected}/{total} selected")
+
+    # -- Export --
+
+    def _on_export(self, _btn):
+        if not self._session_dir:
+            return
+        if not summary_pipeline.has_diarization(self._session_dir):
+            self._export_status.set_text("Run diarization first.")
+            return
+        selected_ids = {fid for fid, c in self._frame_checks.items() if c.get_active()}
+        name_map = {
+            sp: entry.get_text().strip()
+            for sp, entry in self._speaker_entries.items()
+            if entry.get_text().strip()
+        }
+        try:
+            out = summary_pipeline.export(
+                self._session_dir,
+                selected_frame_ids=selected_ids,
+                name_map=name_map,
+            )
+        except Exception as e:
+            log.exception("Export failed")
+            self._export_status.set_text(f"Error: {e}")
+            return
+        self._last_output = out
+        self._open_btn.set_sensitive(True)
+        self._export_status.set_text(f"Wrote {out}")
+
+    def _on_open_output(self, _btn):
+        if not getattr(self, "_last_output", None):
+            return
+        uri = Gio.File.new_for_path(str(self._last_output)).get_uri()
+        Gio.AppInfo.launch_default_for_uri(uri, None)
+
+    # -- helpers --
+
+    def _set_enabled(self, enabled: bool):
+        for w in (self._participants_spin, self._run_btn, self._export_btn):
+            w.set_sensitive(enabled and not self._busy)
+
+    def _clear_widget(self, container: Gtk.Box | Gtk.FlowBox):
+        while child := container.get_first_child():
+            container.remove(child)
+
+
+def _short(s: str, n: int) -> str:
+    s = s.strip()
+    return s if len(s) <= n else s[: n - 1] + "…"

cht/window.py

@@ -18,6 +18,7 @@ from cht.ui.monitor import MonitorWidget
 from cht.ui.waveform import WaveformWidget
 from cht.ui.frames_panel import FramesPanel
 from cht.ui.transcript_panel import TranscriptPanel
+from cht.ui.summary_panel import SummaryPanel
 from cht.ui.keyboard import KeyboardManager, KEY_LEFT, KEY_RIGHT, KEY_UP, KEY_DOWN, KEY_RETURN, KEY_KP_ENTER, KEY_ESCAPE, KEY_DELETE
 from cht.ui.agent_output import AgentOutputPanel
 from cht.ui.agent_input import AgentInputPanel
@@ -261,6 +262,9 @@ class ChtWindow(Adw.ApplicationWindow):
         self._update_scrub_bar_manifest()
         self._populate_model_dropdown()
 
+        self._summary_panel.bind_session(mgr.session_dir)
+        self._summary_panel.set_streaming(False)
+
         # Show "Continue" since there's an active session to resume
         self._connect_btn.set_label("Continue")
 
@@ -328,6 +332,11 @@ class ChtWindow(Adw.ApplicationWindow):
                 self._agent_output.load_thread(self._agent.thread)
 
         self.set_title(f"{APP_NAME} — {mgr.session_id}")
+
+        self._summary_panel.bind_session(None)
+        self._summary_panel.set_streaming(True)
+        self._right_stack.set_visible_child_name("live")
+
         log.info("Waiting for sender...")
 
     def _on_live_toggle(self):
@@ -513,6 +522,7 @@ class ChtWindow(Adw.ApplicationWindow):
             # Stop live player before transitioning to review mode
             self._monitor.reset()
             self._load_session(last_session_id)
+            self._right_stack.set_visible_child_name("summary")
             return
 
         # Full reset — only when not reloading
@@ -527,6 +537,8 @@ class ChtWindow(Adw.ApplicationWindow):
         self._known_frames = set()
         self._frames_panel.clear()
         self._transcript_panel.clear()
+        self._summary_panel.bind_session(None)
+        self._right_stack.set_visible_child_name("live")
         self.set_title(APP_NAME)
 
     def _on_close(self, *args):
@@ -568,17 +580,21 @@ class ChtWindow(Adw.ApplicationWindow):
         self._timeline_controls.scrub_bar.connect("scrub-position", self._on_scrub_position)
         right_box.append(self._timeline_controls)
 
-        # Frames
+        # ViewStack: Live (frames/transcript/agent) ↔ Summary (post-session export)
+        self._right_stack = Adw.ViewStack()
+        self._right_stack.set_vexpand(True)
+
+        live_box = Gtk.Box(orientation=Gtk.Orientation.VERTICAL, spacing=2)
+        live_box.set_vexpand(True)
+
         frames_frame = Gtk.Frame()
         frames_frame.set_child(self._frames_panel)
-        right_box.append(frames_frame)
+        live_box.append(frames_frame)
 
-        # Transcript
         transcript_frame = Gtk.Frame()
         transcript_frame.set_child(self._transcript_panel)
-        right_box.append(transcript_frame)
+        live_box.append(transcript_frame)
 
-        # Agent input
         self._agent_input = AgentInputPanel()
         self._agent_input.connect("send-requested", lambda p, text: self._send_message(text or None))
         self._agent_input.connect("action-requested", lambda p, verb: self._send_action(verb))
@@ -586,7 +602,20 @@ class ChtWindow(Adw.ApplicationWindow):
         self._agent_input.connect("lang-changed", self._on_lang_changed)
         self._agent_input.connect("history-toggled", lambda p, v: setattr(self._agent, "include_history", v))
         self._agent_input.connect("permission-changed", self._on_permission_changed)
-        right_box.append(self._agent_input)
+        live_box.append(self._agent_input)
+
+        live_page = self._right_stack.add_titled(live_box, "live", "Live")
+        live_page.set_icon_name("video-display-symbolic")
+
+        self._summary_panel = SummaryPanel()
+        summary_page = self._right_stack.add_titled(self._summary_panel, "summary", "Summary")
+        summary_page.set_icon_name("text-x-generic-symbolic")
+
+        switcher = Adw.ViewSwitcher()
+        switcher.set_stack(self._right_stack)
+        switcher.set_policy(Adw.ViewSwitcherPolicy.WIDE)
+        right_box.append(switcher)
+        right_box.append(self._right_stack)
 
         return right_box