feat(capture): M11 batch capture - one bank sample per selected item / razor area

Pure batch_capture module (plan + mixed-result aggregation, unit-tested);
CAPTURE_BATCH_ITEMS/RAZOR actions with transient per-unit selection restored
on all paths, per-unit invariants + provenance, single persist.
Conform-on-insert already shipped.

CMakeLists.txt

@@ -178,6 +178,18 @@ add_library(render_settings STATIC src/render_settings.cpp)
 target_include_directories(render_settings PUBLIC src)
 target_link_libraries(render_settings PUBLIC bank_model)
 
+# ---------------------------------------------------------------------------
+# 2f'') Pure batch_capture library — NO REAPER, NO SWELL. The M11 batch-capture
+#       logic: an ordered list of source ranges (one per selected item / per razor
+#       area) -> validated, ordinal-assigned capture units (empty/inverted dropped),
+#       plus order-preserving per-unit result aggregation into a mixed-result summary
+#       line. Split out so the plan/aggregate/summary is unit-tested outside the DAW;
+#       the selection read, transient re-selection, and render loop stay in main.cpp.
+#       No dependency on bank_model — it takes plain ranges/values at its boundary.
+# ---------------------------------------------------------------------------
+add_library(batch_capture STATIC src/batch_capture.cpp)
+target_include_directories(batch_capture PUBLIC src)
+
 # ---------------------------------------------------------------------------
 # 2f') Pure tail_control library — NO REAPER, NO SWELL. The docked bank_panel's
 #      tail-mode toggle logic (T1 exposure): TailSetting state, cycle order
@@ -341,6 +353,10 @@ add_executable(render_settings_tests tests/test_render_settings.cpp)
 target_link_libraries(render_settings_tests PRIVATE render_settings)
 add_test(NAME render_settings_tests COMMAND render_settings_tests)
 
+add_executable(batch_capture_tests tests/test_batch_capture.cpp)
+target_link_libraries(batch_capture_tests PRIVATE batch_capture)
+add_test(NAME batch_capture_tests COMMAND batch_capture_tests)
+
 add_executable(tail_control_tests tests/test_tail_control.cpp)
 target_link_libraries(tail_control_tests PRIVATE tail_control)
 add_test(NAME tail_control_tests COMMAND tail_control_tests)
@@ -417,7 +433,7 @@ add_library(reaper_reasampler MODULE
     src/bank_book.cpp
     src/owned_manifest.cpp
 )
-target_link_libraries(reaper_reasampler PRIVATE bank_model capture_paths peaks bank_grid mode_switch tab_strip view_mode_model insert_plan render_settings tail_control realtime_record bank_book wav_trim owned_manifest prune_reconcile prune_button app_version provenance)
+target_link_libraries(reaper_reasampler PRIVATE bank_model capture_paths peaks bank_grid mode_switch tab_strip view_mode_model insert_plan render_settings batch_capture tail_control realtime_record bank_book wav_trim owned_manifest prune_reconcile prune_button app_version provenance)
 target_include_directories(reaper_reasampler PRIVATE ${SDK_INC} ${WDL_INC})
 # OUTPUT_NAME is channel-derived (Phase V, V4): "reaper_reasampler" (stable, default) or
 # "reaper_reasampler_beta" (beta). REAPER dlopen's any reaper_* module, so both channels'

src/batch_capture.cpp

@@ -0,0 +1,76 @@
+// batch_capture.cpp — pure logic for M11 batch capture. See header.
+// NO REAPER types; unit-tested by tests/test_batch_capture.cpp.
+
+#include "batch_capture.h"
+
+#include <algorithm>
+
+namespace reasampler {
+
+std::vector<CaptureUnit> planCaptureUnits(const std::vector<BatchRange>& ranges) {
+    std::vector<CaptureUnit> units;
+    units.reserve(ranges.size());
+    int ordinal = 0;
+    for (const BatchRange& r : ranges) {
+        // Drop empty/inverted ranges — the offline backend refuses end<=start too, so
+        // planning one would only manufacture a guaranteed per-unit failure. Ordinals
+        // count kept units so the reported numbering is contiguous.
+        if (!(r.endSeconds > r.startSeconds)) continue;
+        ++ordinal;
+        units.push_back({ordinal, r.startSeconds, r.endSeconds});
+    }
+    return units;
+}
+
+void BatchOutcome::record(int ordinal, bool ok, std::string detail) {
+    results_.push_back({ordinal, ok, std::move(detail)});
+}
+
+std::size_t BatchOutcome::succeeded() const {
+    return static_cast<std::size_t>(
+        std::count_if(results_.begin(), results_.end(),
+                      [](const BatchUnitResult& r) { return r.ok; }));
+}
+
+std::size_t BatchOutcome::failed() const {
+    return results_.size() - succeeded();
+}
+
+std::vector<BatchUnitResult> BatchOutcome::failures() const {
+    std::vector<BatchUnitResult> out;
+    for (const BatchUnitResult& r : results_)
+        if (!r.ok) out.push_back(r);
+    return out;
+}
+
+std::string BatchOutcome::summaryLine(const std::string& noun) const {
+    const std::size_t n  = total();
+    const std::size_t ok = succeeded();
+
+    if (n == 0)
+        return "ReaSampler batch capture: nothing to capture.";
+
+    const std::string plural = (n == 1) ? noun : noun + "s";
+
+    if (ok == n)
+        return "ReaSampler batch capture: " + std::to_string(ok) + " " +
+               plural + " captured.";
+
+    // Mixed / all-failed: report the ratio and enumerate the failed ordinals so the
+    // user knows exactly which units to retry. No partial corruption is implied —
+    // each captured unit is a complete, independent bank sample.
+    std::string line = "ReaSampler batch capture: " + std::to_string(ok) + " of " +
+                       std::to_string(n) + " " + plural + " captured (" +
+                       std::to_string(n - ok) + " failed: ";
+    bool first = true;
+    for (const BatchUnitResult& f : results_) {
+        if (f.ok) continue;
+        if (!first) line += ", ";
+        line += "#" + std::to_string(f.ordinal);
+        first = false;
+    }
+    line += ").";
+    return line;
+}
+
+} // namespace reasampler

src/batch_capture.h

@@ -0,0 +1,100 @@
+#pragma once
+// batch_capture — the REAPER-free logic behind M11 batch capture (one action fires
+// N captures: one bank sample per selected item / per razor area).
+//
+// PURE MODULE (CLAUDE.md §load-bearing split): NO REAPER types, NO SWELL, NO
+// vendor/ includes. Standard library only. The batch shell (main.cpp) reads the DAW
+// state (selected items -> their exact bounds; every track's P_RAZOREDITS -> areas)
+// and hands the raw ranges here so the genuinely-pure, easy-to-get-wrong pieces are
+// unit-tested outside the DAW:
+//
+//   1. planCaptureUnits: an ordered list of (start,end) source ranges -> an ordered
+//      list of CaptureUnit, each carrying its 1-based ordinal and validated bounds.
+//      Empty/inverted ranges are DROPPED (mirrors the offline backend's own
+//      end>start guard) so a zero-length item/area never produces a stray render.
+//      Order is preserved: unit ordinals count only the KEPT units, so a batch of
+//      three valid items yields ordinals 1,2,3 regardless of dropped neighbors.
+//   2. BatchOutcome: order-preserving aggregation of per-unit results into a summary
+//      (succeeded / failed counts + the ordered list of failures) so the shell can
+//      report a mixed result with one console line and no partial-corruption
+//      ambiguity. The AGGREGATION is pure; the render loop that feeds it is shell.
+//
+// Range is the ONLY thing that varies per unit here. FX scope (item vs track) is a
+// per-ACTION constant the shell already owns (fxBypassPlanFor); it is not a
+// per-unit field. Item-batch uses item scope; razor-batch uses track scope — the
+// shell passes the scope straight through to each render, unchanged from the
+// single-capture path.
+
+#include <cstddef>
+#include <string>
+#include <vector>
+
+namespace reasampler {
+
+// One capture in a batch: an exact source range plus its 1-based ordinal within the
+// KEPT set. The ordinal disambiguates per-unit file stems (the offline backend's
+// unique tag is 1-second-granular, so a fast batch could otherwise collide N files
+// onto one name) and labels a failure in the summary.
+struct CaptureUnit {
+    int    ordinal      = 0;    // 1-based, counts kept units only
+    double startSeconds = 0.0;  // exact — no rounding
+    double endSeconds   = 0.0;
+};
+
+// A source range handed in by the shell (a selected item's [pos, pos+len] or one
+// razor area's [start, end]). Kept as a distinct type from CaptureUnit so the input
+// (raw, possibly-invalid) and the output (validated, ordinal-assigned) do not share
+// a shape by accident. Named BatchRange (not SourceRange) to avoid collision with
+// bank_model's SourceRange, which carries PPQ fields this planner does not need.
+struct BatchRange {
+    double startSeconds = 0.0;
+    double endSeconds   = 0.0;
+};
+
+// Validates + orders a batch's source ranges into capture units. Preserves input
+// order; DROPS every range with end <= start (empty/inverted) so no stray render is
+// planned; assigns 1-based ordinals over the KEPT units. An empty input (no selected
+// item / no razor area) yields an empty plan — the shell reports "nothing to batch"
+// and writes nothing (the same no-op posture the single-capture path takes).
+std::vector<CaptureUnit> planCaptureUnits(const std::vector<BatchRange>& ranges);
+
+// The per-unit verdict the shell records after each render attempt, in unit order.
+struct BatchUnitResult {
+    int         ordinal = 0;     // the CaptureUnit's ordinal this result is for
+    bool        ok      = false; // true iff the render + bank-add succeeded
+    std::string detail;          // failure reason (empty on success) — for the summary
+};
+
+// Order-preserving aggregation of a batch's per-unit results. Built incrementally by
+// the shell (record() after each unit) so a mid-batch failure is captured without
+// aborting the remaining units (no partial corruption: each unit is independent, and
+// the selection is restored on every exit path by the shell's RAII guard).
+class BatchOutcome {
+public:
+    // Records one unit's verdict. Order of calls IS the reported order.
+    void record(int ordinal, bool ok, std::string detail = {});
+
+    std::size_t total()     const { return results_.size(); }
+    std::size_t succeeded() const;
+    std::size_t failed()    const;
+
+    const std::vector<BatchUnitResult>& results() const { return results_; }
+
+    // The ordered subset of results that failed (ok == false). For the summary line.
+    std::vector<BatchUnitResult> failures() const;
+
+    // A single human summary line for the console (explicit-action response — allowed
+    // by the console policy; a batch-completion summary with failure counts qualifies,
+    // per-unit success spam does not). `noun` is the unit word ("item" / "razor area").
+    // Examples:
+    //   all-success, 3 items : "ReaSampler batch capture: 3 items captured."
+    //   partial, 3 of 5      : "ReaSampler batch capture: 3 of 5 items captured "
+    //                          "(2 failed: #2, #4)."
+    //   empty plan           : "ReaSampler batch capture: nothing to capture."
+    std::string summaryLine(const std::string& noun) const;
+
+private:
+    std::vector<BatchUnitResult> results_;
+};
+
+} // namespace reasampler

src/main.cpp

@@ -18,9 +18,11 @@
 #include "reaper_plugin.h"
 #include "reaper_plugin_functions.h"
 
+#include <cstddef>
 #include <deque>
 #include <memory>
 #include <string>
+#include <utility>
 
 #include <vector>
 
@@ -28,6 +30,7 @@
 #include "app_version.h"
 #include "bank_model.h"
 #include "bank_panel.h"
+#include "batch_capture.h"
 #include "capture.h"
 #include "insert.h"
 #include "persist.h"
@@ -124,6 +127,14 @@ static int g_cmdToggleBankPanel = 0;
 static int g_cmdInsertSelected = 0;
 static int g_cmdInsertSelectedConform = 0;
 
+// Command ids for the M11 batch-capture actions. NEW FOREVER-STABLE strings. One action
+// fires N captures: CAPTURE_BATCH_ITEMS -> one bank sample per selected item (item scope);
+// CAPTURE_BATCH_RAZOR -> one bank sample per razor area (track scope, each area's range).
+// Each unit honors every precision invariant; the original selection is restored on every
+// exit path. Bank-only, never places on the timeline (load-bearing principle).
+static int g_cmdCaptureBatchItems = 0;
+static int g_cmdCaptureBatchRazor = 0;
+
 // Command id for the "capture selected track (realtime)" action. NEW FOREVER-STABLE
 // string. Records the selected track's OWN output in realtime (transport-driven) into
 // a hidden temp track via RealtimeRecordBackend, then moves the recorded file into the
@@ -714,13 +725,75 @@ static reasampler::CaptureResult renderOffline(
     return backend.capture(req);
 }
 
-// Runs one capture-action-table row: resolve its scope source + range, snapshot &
-// clear the out-of-scope FX AND neutralize their fader gain + pan chain (RAII),
-// render via the offline backend, add the Sample to the bank, persist + mark dirty.
-// The load-bearing principle holds structurally — this path writes a file + a bank
-// index entry ONLY; it never calls InsertMedia or touches the arrange/timeline.
-// Non-destructive: FX-enable + fader gain + pan/width/law/mode are fully restored
-// on every path by FxBypassGuard, and the backend restores every RENDER_* setting.
+// Renders ONE capture request under the scope's FX-bypass guard, stamps provenance,
+// and adds the resulting Sample to the ACTIVE bank + records the created file in the
+// owned-file manifest — WITHOUT persisting. The caller persists once (single-capture:
+// right after; batch: once at the end) so a batch does not write ext state N times.
+//
+// Provenance is read from the LIVE selection here, so a batch that transiently
+// selects exactly one item per unit gets per-unit-correct provenance. `src` supplies
+// the source tracks (FX bypass + Sample GUIDs); `scope` drives the bypass plan and
+// provenance scope. Returns the backend's CaptureResult (status + message) so the
+// caller can report success/failure. Load-bearing principle holds: writes a file +
+// a bank index entry ONLY; never touches the arrange/timeline. Non-destructive: the
+// out-of-scope FX/fader/pan chain is fully restored on every path (FxBypassGuard),
+// and the backend restores every RENDER_* setting.
+static reasampler::CaptureResult captureAndIndexOne(
+    reasampler::CaptureScope scope,
+    const ResolvedSource& src,
+    const std::string& baseName,
+    double startSeconds,
+    double endSeconds)
+{
+    // The tail mode is a PANEL SETTING (docked bank panel's toggle), not a per-action
+    // variant: the capture actions apply whatever the panel is set to. Default is None
+    // (exact bounds / byte-identical to today) until the user opts in via the toggle.
+    const reasampler::TailSetting tail = reasampler::bankPanelTailSetting();
+
+    reasampler::CaptureRequest req;
+    req.sourceMode   = reasampler::sourceModeForScope(scope);
+    req.startSeconds = startSeconds;        // exact bounds — no rounding
+    req.endSeconds   = endSeconds;
+    req.wetDry       = 1.0;                 // wet post the FX left enabled by the scope
+    req.tailMode     = tail.mode;           // None / Auto / Manual, from the panel toggle
+    req.tailMs       = tail.manualMs;       // Manual-only (clamped); ignored for None/Auto
+    req.sampleRate   = 0;                   // follow project rate
+    req.channelCount = 2;
+    req.bitDepth     = reasampler::WavBitDepth::Float32;  // deterministic, no dither
+    req.baseName     = baseName;
+    req.trackGuids   = src.trackGuids;      // recorded on the Sample (provenance)
+
+    // M10: compute provenance BEFORE the FxBypassGuard neutralizes the in-scope chain —
+    // the source FX-chain identity must be read from the LIVE (un-bypassed) chain, and
+    // the source selection is still live here. Returns nullopt unless this capture
+    // genuinely resamples from a bank sample (detectParent). Read-only.
+    const std::optional<reasampler::Provenance> prov =
+        buildCaptureProvenance(req, scope, src);
+
+    // Render under the scope's FX-bypass guard (out-of-scope FX / fader / pan chain
+    // neutralized for the render, fully restored on every path). Writes a file only.
+    reasampler::CaptureResult res = renderOffline(scope, src.sourceTracks, req);
+    if (res.status != reasampler::CaptureStatus::Ok)
+        return res;
+
+    // Stamp provenance onto the captured Sample (only set when this was a genuine
+    // resample-from-sample; otherwise the optional stays empty, per M1's contract).
+    res.sample.provenance = prov;
+
+    // Add to the ACTIVE bank: g_session.bank() resolves to book.activeIndex() (B2).
+    g_session.bank().add(res.sample);
+    // B-cap: record the created file in the owned-file manifest, at the same point the
+    // Sample is added. Recorded regardless of the index AddResult — even a hash-collapse
+    // still WROTE a file the tool owns, and the manifest dedups a repeat path itself
+    // (Phase R prune reconciles manifest vs index later).
+    g_session.owned().add(res.sample.relativePath);
+    return res;
+}
+
+// Runs one capture-action-table row: resolve its scope source + range, render + add +
+// record via captureAndIndexOne, then persist + mark dirty. The load-bearing principle
+// holds structurally — this path writes a file + a bank index entry ONLY; it never
+// calls InsertMedia or touches the arrange/timeline.
 static void RunCapture(const reasampler::CaptureActionDef& def)
 {
     ResolvedSource src;
@@ -731,54 +804,14 @@ static void RunCapture(const reasampler::CaptureActionDef& def)
         return;
     }
 
-    // The tail mode is a PANEL SETTING (docked bank panel's toggle), not a per-action
-    // variant: the plain capture actions apply whatever the panel is set to. Default
-    // is None (exact bounds / byte-identical to today) until the user opts in via the
-    // toggle. tailMs is meaningful only for Manual and is pre-clamped by the panel.
-    const reasampler::TailSetting tail = reasampler::bankPanelTailSetting();
-
-    reasampler::CaptureRequest req;
-    req.sourceMode   = reasampler::sourceModeForScope(def.scope);
-    req.startSeconds = src.startSeconds;    // exact bounds — no rounding
-    req.endSeconds   = src.endSeconds;
-    req.wetDry       = 1.0;                 // wet post the FX left enabled by the scope
-    req.tailMode     = tail.mode;           // None / Auto / Manual, from the panel toggle
-    req.tailMs       = tail.manualMs;       // Manual-only (clamped); ignored for None/Auto
-    req.sampleRate   = 0;                   // follow project rate
-    req.channelCount = 2;
-    req.bitDepth     = reasampler::WavBitDepth::Float32;  // deterministic, no dither
-    req.baseName     = def.baseName;
-    req.trackGuids   = src.trackGuids;      // recorded on the Sample (provenance)
-
-    // M10: compute provenance BEFORE the FxBypassGuard neutralizes the in-scope chain —
-    // the source FX-chain identity must be read from the LIVE (un-bypassed) chain, and
-    // the source selection is still live here. Returns nullopt unless this capture
-    // genuinely resamples from a bank sample (detectParent). Read-only.
-    const std::optional<reasampler::Provenance> prov =
-        buildCaptureProvenance(req, def.scope, src);
-
-    // Render under the scope's FX-bypass guard (out-of-scope FX / fader / pan chain
-    // neutralized for the render, fully restored on every path — see renderOffline
-    // and the FxBypassGuard header comment). Non-destructive; writes a file only.
-    reasampler::CaptureResult res = renderOffline(def.scope, src.sourceTracks, req);
-
+    reasampler::CaptureResult res =
+        captureAndIndexOne(def.scope, src, def.baseName, src.startSeconds, src.endSeconds);
     if (res.status != reasampler::CaptureStatus::Ok)
     {
         ShowConsoleMsg(("ReaSampler capture failed: " + res.message + "\n").c_str());
         return;
     }
 
-    // Stamp provenance onto the captured Sample (only set when this was a genuine
-    // resample-from-sample; otherwise the optional stays empty, per M1's contract).
-    res.sample.provenance = prov;
-
-    // Add to the ACTIVE bank: g_session.bank() resolves to book.activeIndex() (B2).
-    g_session.bank().add(res.sample);
-    // B-cap: record the created file in the owned-file manifest, at the same point the
-    // Sample is added and before the same persist. Recorded regardless of the index
-    // AddResult — even a hash-collapse still WROTE a file the tool owns, and the manifest
-    // dedups a repeat path itself (Phase R prune reconciles manifest vs index later).
-    g_session.owned().add(res.sample.relativePath);
     // Persist the updated book AND manifest into the active project's ext state (the
     // `banks` + `owned_files` keys) so the capture survives Save / close+reopen (M4) and
     // travels with the .rpp. saveToActiveProject also clears the retired legacy key and
@@ -786,6 +819,271 @@ static void RunCapture(const reasampler::CaptureActionDef& def)
     g_session.saveToActiveProject();
 }
 
+// --- M11: batch capture (per selected item / per razor area) ----------------
+//
+// One action fires N captures — one bank sample per selected item (item scope) or per
+// razor area (track scope, each area's own range). Each individual capture honors every
+// precision invariant via captureAndIndexOne (exact bounds, non-destructive FX/fader/pan
+// neutralize, relative paths, channel preservation) and M10 provenance stamping applies
+// per capture where its detection rule matches. The load-bearing principle holds: each
+// unit writes a file + a bank index entry ONLY; nothing lands in the arrange.
+//
+// Per-unit FILE NAMING: the offline backend's unique tag is 1-second-granular. The
+// per-item render already takes real wall-clock time (REAPER's offline-render dialog per
+// unit), so consecutive units naturally land in distinct seconds; belt-and-braces, each
+// unit's baseName also carries its ordinal ("item-1", "item-2", ...) so two units are
+// never asked to write the same stem within one batch. (Residual, DAW-verify: two BATCHES
+// fired within the same wall-clock second with identical ordinals could still collide —
+// unreachable in practice given the per-unit render latency, noted for completeness.)
+
+// RAII snapshot/restore of the project's media-item selection. Batch item capture must
+// transiently select exactly one item per render (RENDER_SETTINGS &32 renders whatever is
+// selected); the user's ORIGINAL selection must be restored on EVERY exit path — including
+// a mid-batch failure or early return — because selection restoration is part of the
+// non-destructive invariant. Snapshot on construct (the currently-selected item set),
+// restore on destruct (deselect everything, then re-select exactly the snapshot).
+class ItemSelectionGuard
+{
+public:
+    ItemSelectionGuard()
+    {
+        const int n = CountSelectedMediaItems(nullptr);
+        for (int i = 0; i < n; ++i)
+            if (MediaItem* it = GetSelectedMediaItem(nullptr, i))
+                selected_.push_back(it);
+    }
+
+    ~ItemSelectionGuard()
+    {
+        // Deselect every item in the project, then re-select the snapshot — restoring the
+        // exact original set regardless of what the batch selected in between. Iterate ALL
+        // items (not just the currently-selected) so any transient selection is cleared.
+        const int total = CountMediaItems(nullptr);
+        for (int i = 0; i < total; ++i)
+            if (MediaItem* it = GetMediaItem(nullptr, i))
+                SetMediaItemSelected(it, false);
+        for (MediaItem* it : selected_)
+            SetMediaItemSelected(it, true);
+        UpdateArrange();  // reflect the restored selection in the arrange view
+    }
+
+    ItemSelectionGuard(const ItemSelectionGuard&)            = delete;
+    ItemSelectionGuard& operator=(const ItemSelectionGuard&) = delete;
+
+private:
+    std::vector<MediaItem*> selected_;
+};
+
+// Selects exactly `item` (deselect-all then select-one) so the offline render's
+// selected-items bit (&32) captures a single item. Used inside the batch loop under the
+// ItemSelectionGuard, which restores the user's original selection afterward.
+static void selectOnlyItem(MediaItem* item)
+{
+    const int total = CountMediaItems(nullptr);
+    for (int i = 0; i < total; ++i)
+        if (MediaItem* it = GetMediaItem(nullptr, i))
+            SetMediaItemSelected(it, it == item);
+}
+
+// Batch item capture: one bank sample per SELECTED item, item scope. Snapshots the
+// selection (RAII restore on every path), then for each selected item transiently selects
+// only it, renders its exact [pos, pos+len] range under item-scope FX neutralize, adds the
+// Sample, and records a per-unit verdict. Persists ONCE at the end (one ext-state write for
+// the whole batch). Reports a mixed-result summary (explicit-action response — allowed).
+static void RunBatchCaptureItems()
+{
+    // Read the selected items up front (pointers stay valid — batch mutates only selection
+    // flags, never adds/removes items). Also capture each item's exact bounds and owning
+    // track NOW, while the full selection is live, before any transient re-selection.
+    struct ItemUnit { MediaItem* item; MediaTrack* track; double start; double end; };
+    std::vector<ItemUnit> itemUnits;
+    {
+        const int n = CountSelectedMediaItems(nullptr);
+        for (int i = 0; i < n; ++i)
+        {
+            MediaItem* it = GetSelectedMediaItem(nullptr, i);
+            if (!it) continue;
+            MediaTrack* tr = GetMediaItem_Track(it);
+            if (!tr) continue;
+            const double pos = GetMediaItemInfo_Value(it, "D_POSITION");
+            const double len = GetMediaItemInfo_Value(it, "D_LENGTH");
+            itemUnits.push_back({it, tr, pos, pos + len});
+        }
+    }
+    if (itemUnits.empty())
+    {
+        ShowConsoleMsg("ReaSampler batch capture: select at least one media item.\n");
+        return;
+    }
+
+    // Plan the exact source ranges -> validated, ordinal-assigned units (pure). Empty/
+    // inverted item ranges (a zero-length item) are dropped here so no stray render runs.
+    std::vector<reasampler::BatchRange> ranges;
+    ranges.reserve(itemUnits.size());
+    for (const ItemUnit& u : itemUnits)
+        ranges.push_back({u.start, u.end});
+    const std::vector<reasampler::CaptureUnit> plan = reasampler::planCaptureUnits(ranges);
+
+    reasampler::BatchOutcome outcome;
+    bool anyAdded = false;
+    {
+        // Restore the user's ORIGINAL item selection on every exit path (incl. early
+        // return / mid-batch failure) — non-destructive invariant.
+        ItemSelectionGuard selGuard;
+
+        // The plan and itemUnits are parallel over the KEPT units. Walk itemUnits, but only
+        // for those whose range survived planning (same drop rule), matching by ordinal.
+        std::size_t planIdx = 0;
+        for (const ItemUnit& u : itemUnits)
+        {
+            if (!(u.end > u.start)) continue;  // dropped by planCaptureUnits — skip in lockstep
+            const reasampler::CaptureUnit& unit = plan[planIdx++];
+
+            // Transiently select ONLY this item so the item-scope render captures exactly it.
+            selectOnlyItem(u.item);
+
+            ResolvedSource src;
+            src.startSeconds = unit.startSeconds;
+            src.endSeconds   = unit.endSeconds;
+            src.sourceTracks.push_back(u.track);
+            if (std::string g = reasampler::guidString(u.track); !g.empty())
+                src.trackGuids.push_back(std::move(g));
+
+            const std::string baseName = "item-" + std::to_string(unit.ordinal);
+            reasampler::CaptureResult res = captureAndIndexOne(
+                reasampler::CaptureScope::Item, src, baseName,
+                unit.startSeconds, unit.endSeconds);
+
+            const bool ok = (res.status == reasampler::CaptureStatus::Ok);
+            outcome.record(unit.ordinal, ok, ok ? std::string{} : res.message);
+            if (ok) anyAdded = true;
+        }
+    }  // selGuard restores the original selection here, on every path
+
+    // Persist ONCE for the whole batch (one ext-state write) — only if something landed.
+    if (anyAdded)
+        g_session.saveToActiveProject();
+
+    ShowConsoleMsg((outcome.summaryLine("item") + "\n").c_str());
+}
+
+// Collects every track's razor AUDIO areas as (owning track, range) pairs, preserving
+// track order then area order — the batch analog of resolveRazorRange, which unions them.
+// Read-only (never clears the razor selection). Reuses the pure parseRazorEdits parser.
+static std::vector<std::pair<MediaTrack*, reasampler::RazorRange>> collectRazorAreas()
+{
+    std::vector<std::pair<MediaTrack*, reasampler::RazorRange>> areas;
+    const int n = CountTracks(nullptr);
+    for (int i = 0; i < n; ++i)
+    {
+        MediaTrack* tr = GetTrack(nullptr, i);
+        if (!tr) continue;
+        std::vector<char> buf(8192, '\0');
+        if (!GetSetMediaTrackInfo_String(tr, "P_RAZOREDITS", buf.data(), false))
+            continue;
+        for (const reasampler::RazorRange& r :
+             reasampler::parseRazorEdits(std::string(buf.data())))
+            areas.push_back({tr, r});
+    }
+    return areas;
+}
+
+// RAII snapshot/restore of the project's TRACK selection. Batch razor capture must
+// transiently select exactly the area's owning track per render (track scope's &128 bit
+// renders whatever TRACKS are selected); the user's original track selection is restored
+// on EVERY exit path (part of the non-destructive invariant). Mirror of ItemSelectionGuard.
+class TrackSelectionGuard
+{
+public:
+    TrackSelectionGuard()
+    {
+        const int n = CountSelectedTracks(nullptr);
+        for (int i = 0; i < n; ++i)
+            if (MediaTrack* tr = GetSelectedTrack(nullptr, i))
+                selected_.push_back(tr);
+    }
+
+    ~TrackSelectionGuard()
+    {
+        // Deselect every track, then re-select the snapshot — the exact original set.
+        const int total = CountTracks(nullptr);
+        for (int i = 0; i < total; ++i)
+            if (MediaTrack* tr = GetTrack(nullptr, i))
+                SetTrackSelected(tr, false);
+        for (MediaTrack* tr : selected_)
+            SetTrackSelected(tr, true);
+    }
+
+    TrackSelectionGuard(const TrackSelectionGuard&)            = delete;
+    TrackSelectionGuard& operator=(const TrackSelectionGuard&) = delete;
+
+private:
+    std::vector<MediaTrack*> selected_;
+};
+
+// Batch razor capture: one bank sample per razor AREA, track scope over that area's own
+// range (the area's owning track is the source track). Track scope renders the selected
+// TRACKS via master (&128), so each unit transiently selects ONLY its owning track
+// (SetOnlyTrackSelected) under the TrackSelectionGuard, which restores the user's original
+// track selection on every path. The razor selection itself is read-only and left intact.
+// Persists ONCE at the end. Reports a mixed-result summary.
+static void RunBatchCaptureRazor()
+{
+    const std::vector<std::pair<MediaTrack*, reasampler::RazorRange>> areas =
+        collectRazorAreas();
+    if (areas.empty())
+    {
+        ShowConsoleMsg("ReaSampler batch capture: make at least one razor area first.\n");
+        return;
+    }
+
+    std::vector<reasampler::BatchRange> ranges;
+    ranges.reserve(areas.size());
+    for (const auto& a : areas)
+        ranges.push_back({a.second.startSeconds, a.second.endSeconds});
+    const std::vector<reasampler::CaptureUnit> plan = reasampler::planCaptureUnits(ranges);
+
+    reasampler::BatchOutcome outcome;
+    bool anyAdded = false;
+    {
+        // Restore the user's ORIGINAL track selection on every exit path.
+        TrackSelectionGuard selGuard;
+
+        std::size_t planIdx = 0;
+        for (const auto& a : areas)
+        {
+            if (!(a.second.endSeconds > a.second.startSeconds)) continue;  // dropped — lockstep
+            const reasampler::CaptureUnit& unit = plan[planIdx++];
+            MediaTrack* tr = a.first;
+
+            // Transiently select ONLY this track so the track-scope render (&128) captures
+            // exactly it via master (over the custom time bounds we set per unit).
+            SetOnlyTrackSelected(tr);
+
+            ResolvedSource src;
+            src.startSeconds = unit.startSeconds;
+            src.endSeconds   = unit.endSeconds;
+            src.sourceTracks.push_back(tr);
+            if (std::string g = reasampler::guidString(tr); !g.empty())
+                src.trackGuids.push_back(std::move(g));
+
+            const std::string baseName = "razor-" + std::to_string(unit.ordinal);
+            reasampler::CaptureResult res = captureAndIndexOne(
+                reasampler::CaptureScope::Track, src, baseName,
+                unit.startSeconds, unit.endSeconds);
+
+            const bool ok = (res.status == reasampler::CaptureStatus::Ok);
+            outcome.record(unit.ordinal, ok, ok ? std::string{} : res.message);
+            if (ok) anyAdded = true;
+        }
+    }  // selGuard restores the original track selection here, on every path
+
+    if (anyAdded)
+        g_session.saveToActiveProject();
+
+    ShowConsoleMsg((outcome.summaryLine("razor area") + "\n").c_str());
+}
+
 // --- M10: re-capture from source --------------------------------------------
 //
 // Regenerates a PROVENANCED bank sample's file from its recorded source's CURRENT
@@ -1124,6 +1422,8 @@ static bool OnHookCommand(int command, int /*flag*/)
     if (command == g_cmdToggleBankPanel)         { reasampler::bankPanelToggle(); return true; }
     if (command == g_cmdInsertSelected)          { RunInsertSelected(false); return true; }
     if (command == g_cmdInsertSelectedConform)   { RunInsertSelected(true);  return true; }
+    if (command == g_cmdCaptureBatchItems)       { RunBatchCaptureItems(); return true; }
+    if (command == g_cmdCaptureBatchRazor)       { RunBatchCaptureRazor(); return true; }
     if (command == g_cmdCaptureTrackRealtime)    { RunCaptureRealtimeTrack(); return true; }
     if (command == g_cmdCancelRealtime)          { RunCancelRealtime(); return true; }
     if (command == g_cmdRecaptureFromSource)     { RunRecaptureFromSource(); return true; }
@@ -1155,6 +1455,8 @@ static int OnToggleAction(int command)
 static gaccel_register_t g_accelToggleBankPanel{};
 static gaccel_register_t g_accelInsertSelected{};
 static gaccel_register_t g_accelInsertSelectedConform{};
+static gaccel_register_t g_accelCaptureBatchItems{};
+static gaccel_register_t g_accelCaptureBatchRazor{};
 static gaccel_register_t g_accelCaptureTrackRealtime{};
 static gaccel_register_t g_accelCancelRealtime{};
 static gaccel_register_t g_accelRecaptureFromSource{};
@@ -1166,6 +1468,8 @@ static gaccel_register_t g_accelShowVersion{};
 static std::string g_descToggleBankPanel;
 static std::string g_descInsertSelected;
 static std::string g_descInsertSelectedConform;
+static std::string g_descCaptureBatchItems;
+static std::string g_descCaptureBatchRazor;
 static std::string g_descCaptureTrackRealtime;
 static std::string g_descCancelRealtime;
 static std::string g_descRecaptureFromSource;
@@ -1176,6 +1480,8 @@ static std::string g_descShowVersion;
 static const char* g_idToggleBankPanel = nullptr;
 static const char* g_idInsertSelected = nullptr;
 static const char* g_idInsertSelectedConform = nullptr;
+static const char* g_idCaptureBatchItems = nullptr;
+static const char* g_idCaptureBatchRazor = nullptr;
 static const char* g_idCaptureTrackRealtime = nullptr;
 static const char* g_idCancelRealtime = nullptr;
 static const char* g_idRecaptureFromSource = nullptr;
@@ -1221,6 +1527,10 @@ extern "C" REAPER_PLUGIN_DLL_EXPORT int REAPER_PLUGIN_ENTRYPOINT(
             g_rec->Register("-command_id", (void*)g_idCancelRealtime);
             g_rec->Register("-gaccel", (void*)&g_accelCaptureTrackRealtime);
             g_rec->Register("-command_id", (void*)g_idCaptureTrackRealtime);
+            g_rec->Register("-gaccel", (void*)&g_accelCaptureBatchRazor);
+            g_rec->Register("-command_id", (void*)g_idCaptureBatchRazor);
+            g_rec->Register("-gaccel", (void*)&g_accelCaptureBatchItems);
+            g_rec->Register("-command_id", (void*)g_idCaptureBatchItems);
             g_rec->Register("-gaccel", (void*)&g_accelInsertSelectedConform);
             g_rec->Register("-command_id", (void*)g_idInsertSelectedConform);
             g_rec->Register("-gaccel", (void*)&g_accelInsertSelected);
@@ -1340,6 +1650,32 @@ extern "C" REAPER_PLUGIN_DLL_EXPORT int REAPER_PLUGIN_ENTRYPOINT(
         rec->Register("gaccel", (void*)&g_accelInsertSelectedConform);
     }
 
+    // Register the M11 batch-capture actions (command_id -> gaccel -> hookcommand). Each
+    // fires N captures (one bank sample per selected item / per razor area), honoring every
+    // precision invariant per unit and restoring the original selection on every path.
+    // Channel-qualified FOREVER-STABLE ids.
+    g_idCaptureBatchItems = internCmdId("CAPTURE_BATCH_ITEMS");
+    g_cmdCaptureBatchItems = rec->Register("command_id", (void*)g_idCaptureBatchItems);
+    if (g_cmdCaptureBatchItems)
+    {
+        g_descCaptureBatchItems =
+            reasampler::channelActionName("batch capture selected items (one per item)");
+        g_accelCaptureBatchItems.accel.cmd = g_cmdCaptureBatchItems;
+        g_accelCaptureBatchItems.desc      = g_descCaptureBatchItems.c_str();
+        rec->Register("gaccel", (void*)&g_accelCaptureBatchItems);
+    }
+
+    g_idCaptureBatchRazor = internCmdId("CAPTURE_BATCH_RAZOR");
+    g_cmdCaptureBatchRazor = rec->Register("command_id", (void*)g_idCaptureBatchRazor);
+    if (g_cmdCaptureBatchRazor)
+    {
+        g_descCaptureBatchRazor =
+            reasampler::channelActionName("batch capture razor areas (one per area)");
+        g_accelCaptureBatchRazor.accel.cmd = g_cmdCaptureBatchRazor;
+        g_accelCaptureBatchRazor.desc      = g_descCaptureBatchRazor.c_str();
+        rec->Register("gaccel", (void*)&g_accelCaptureBatchRazor);
+    }
+
     // Register the "capture selected track (realtime)" action (command_id -> gaccel ->
     // hookcommand). Realtime sibling of the offline CAPTURE_TRACK scope: records the
     // selected track's own output in realtime into a hidden temp track, moves it into

tests/test_batch_capture.cpp

@@ -0,0 +1,162 @@
+// Standalone tests for reasampler::batch_capture — no REAPER, no test framework.
+// Same fast loop as the sibling pure tests (render_settings et al.): assert the batch
+// planning (selected-set -> ordered capture units) and result aggregation directly.
+//
+// Covers (M11 brief §test cases):
+//   * selected-set -> capture-request-list planning: items; razor areas; empty set;
+//     multiple razor areas across tracks (order preserved, ordinals contiguous);
+//     invalid (empty/inverted) ranges dropped.
+//   * batch result aggregation: all-success; partial-failure ORDERING (failed
+//     ordinals reported in unit order); all-failed; single-unit noun singular.
+
+#include "../src/batch_capture.h"
+
+#include <cstdio>
+#include <string>
+#include <vector>
+
+using namespace reasampler;
+
+static int g_fail = 0;
+#define CHECK(cond) do { if(!(cond)) { \
+    std::printf("FAIL line %d: %s\n", __LINE__, #cond); ++g_fail; } } while(0)
+
+// --- planCaptureUnits: items -------------------------------------------------
+
+// Three selected items -> three units, order preserved, ordinals 1,2,3, bounds exact.
+static void testPlanItemsPreservesOrderAndBounds() {
+    std::vector<BatchRange> in = {{0.0, 1.5}, {2.0, 2.25}, {10.0, 12.0}};
+    auto units = planCaptureUnits(in);
+    CHECK(units.size() == 3);
+    CHECK(units[0].ordinal == 1 && units[0].startSeconds == 0.0 && units[0].endSeconds == 1.5);
+    CHECK(units[1].ordinal == 2 && units[1].startSeconds == 2.0 && units[1].endSeconds == 2.25);
+    CHECK(units[2].ordinal == 3 && units[2].startSeconds == 10.0 && units[2].endSeconds == 12.0);
+}
+
+// --- planCaptureUnits: empty set ---------------------------------------------
+
+// No selected item / no razor area -> empty plan (shell reports nothing-to-batch).
+static void testPlanEmptySet() {
+    CHECK(planCaptureUnits({}).empty());
+}
+
+// --- planCaptureUnits: invalid ranges dropped, ordinals stay contiguous ------
+
+// An empty (end==start) and an inverted (end<start) range are DROPPED; the kept
+// units are renumbered 1..k with no gap, so a dropped neighbor never leaves a hole
+// in the reported ordinals.
+static void testPlanDropsInvalidAndRenumbers() {
+    std::vector<BatchRange> in = {
+        {0.0, 1.0},   // kept -> #1
+        {5.0, 5.0},   // empty  -> dropped
+        {3.0, 2.0},   // inverted -> dropped
+        {8.0, 9.0},   // kept -> #2
+    };
+    auto units = planCaptureUnits(in);
+    CHECK(units.size() == 2);
+    CHECK(units[0].ordinal == 1 && units[0].startSeconds == 0.0 && units[0].endSeconds == 1.0);
+    CHECK(units[1].ordinal == 2 && units[1].startSeconds == 8.0 && units[1].endSeconds == 9.0);
+}
+
+// --- planCaptureUnits: multiple razor areas across tracks --------------------
+
+// The shell concatenates every track's parsed razor areas in track order; planning
+// preserves that concatenation order and assigns contiguous ordinals. Two areas on
+// track A followed by one on track B -> ordinals 1,2,3 in that exact order.
+static void testPlanRazorAreasAcrossTracksOrdered() {
+    std::vector<BatchRange> in = {
+        {0.0, 0.5},   // track A, area 1
+        {1.0, 1.5},   // track A, area 2
+        {4.0, 6.0},   // track B, area 1
+    };
+    auto units = planCaptureUnits(in);
+    CHECK(units.size() == 3);
+    CHECK(units[0].startSeconds == 0.0 && units[0].endSeconds == 0.5);
+    CHECK(units[1].startSeconds == 1.0 && units[1].endSeconds == 1.5);
+    CHECK(units[2].startSeconds == 4.0 && units[2].endSeconds == 6.0);
+    CHECK(units[0].ordinal == 1 && units[1].ordinal == 2 && units[2].ordinal == 3);
+}
+
+// --- BatchOutcome: all-success -----------------------------------------------
+
+static void testOutcomeAllSuccess() {
+    BatchOutcome o;
+    o.record(1, true);
+    o.record(2, true);
+    o.record(3, true);
+    CHECK(o.total() == 3);
+    CHECK(o.succeeded() == 3);
+    CHECK(o.failed() == 0);
+    CHECK(o.failures().empty());
+    CHECK(o.summaryLine("item") == "ReaSampler batch capture: 3 items captured.");
+}
+
+// --- BatchOutcome: partial-failure ordering ----------------------------------
+
+// Failures are reported in UNIT ORDER (#2, #4), not record-count order or sorted —
+// the summary must let the user retry exactly the right units. This assertion fails
+// if the aggregation reordered, deduped, or dropped a failure.
+static void testOutcomePartialFailureOrdering() {
+    BatchOutcome o;
+    o.record(1, true);
+    o.record(2, false, "render produced no output file");
+    o.record(3, true);
+    o.record(4, false, "capture range is empty");
+    o.record(5, true);
+    CHECK(o.total() == 5);
+    CHECK(o.succeeded() == 3);
+    CHECK(o.failed() == 2);
+
+    auto fails = o.failures();
+    CHECK(fails.size() == 2);
+    CHECK(fails[0].ordinal == 2 && !fails[0].ok);
+    CHECK(fails[0].detail == "render produced no output file");
+    CHECK(fails[1].ordinal == 4);
+
+    CHECK(o.summaryLine("item") ==
+          "ReaSampler batch capture: 3 of 5 items captured (2 failed: #2, #4).");
+}
+
+// --- BatchOutcome: all-failed ------------------------------------------------
+
+static void testOutcomeAllFailed() {
+    BatchOutcome o;
+    o.record(1, false, "x");
+    o.record(2, false, "y");
+    CHECK(o.succeeded() == 0);
+    CHECK(o.failed() == 2);
+    CHECK(o.summaryLine("razor area") ==
+          "ReaSampler batch capture: 0 of 2 razor areas captured (2 failed: #1, #2).");
+}
+
+// --- BatchOutcome: single unit uses singular noun ----------------------------
+
+static void testOutcomeSingularNoun() {
+    BatchOutcome o;
+    o.record(1, true);
+    CHECK(o.summaryLine("item") == "ReaSampler batch capture: 1 item captured.");
+}
+
+// --- BatchOutcome: empty (no units planned) ----------------------------------
+
+static void testOutcomeEmpty() {
+    BatchOutcome o;
+    CHECK(o.total() == 0);
+    CHECK(o.summaryLine("item") == "ReaSampler batch capture: nothing to capture.");
+}
+
+int main() {
+    testPlanItemsPreservesOrderAndBounds();
+    testPlanEmptySet();
+    testPlanDropsInvalidAndRenumbers();
+    testPlanRazorAreasAcrossTracksOrdered();
+
+    testOutcomeAllSuccess();
+    testOutcomePartialFailureOrdering();
+    testOutcomeAllFailed();
+    testOutcomeSingularNoun();
+    testOutcomeEmpty();
+
+    if (g_fail == 0) std::printf("All tests passed.\n");
+    return g_fail ? 1 : 0;
+}