From 0de24122adb96607a8b6a767e02a3968f464f3a7 Mon Sep 17 00:00:00 2001
From: Damien Elmes <gpg@ankiweb.net>
Date: Mon, 6 Dec 2021 22:18:53 +1000
Subject: [PATCH] implement a basic native macOS audio recorder
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

This was motivated by the fact that recording was crashing on the native
M1 build. That ended up being mostly a PEBKAC problem - turns out the
Mac Mini has no built-in microphone 🤦.

I still thinks this has some value though - it doesn't crash in such
cases, and probably doesn't suffer from the problem shown in this thread
either:

https://forums.ankiweb.net/t/anki-crashes-when-trying-to-record-on-mac/14764

For now, this is only enabled when running on arm64. If it turns out to
be reliable, it could be offered as an option on amd64 as well.
---
 qt/aqt/_macos_helper.py                       |  55 ++++++++
 qt/aqt/sound.py                               |  40 ++++--
 qt/aqt/theme.py                               |  41 ++----
 qt/mac/BUILD.bazel                            |   1 +
 qt/mac/ankihelper.xcodeproj/project.pbxproj   |   4 +
 .../UserInterfaceState.xcuserstate            | Bin 19893 -> 27529 bytes
 .../xcschemes/ankihelper.xcscheme             |  23 ++++
 qt/mac/record.swift                           | 117 ++++++++++++++++++
 8 files changed, 241 insertions(+), 40 deletions(-)
 create mode 100644 qt/aqt/_macos_helper.py
 create mode 100644 qt/mac/ankihelper.xcodeproj/xcuserdata/dae.xcuserdatad/xcschemes/ankihelper.xcscheme
 create mode 100644 qt/mac/record.swift

diff --git a/qt/aqt/_macos_helper.py b/qt/aqt/_macos_helper.py
new file mode 100644
index 000000000..f0c14d999
--- /dev/null
+++ b/qt/aqt/_macos_helper.py
@@ -0,0 +1,55 @@
+# Copyright: Ankitects Pty Ltd and contributors
+# License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
+
+from __future__ import annotations
+
+import os
+import sys
+from ctypes import CDLL, CFUNCTYPE, c_char_p
+from typing import Callable
+
+import aqt
+
+
+class _MacOSHelper:
+    def __init__(self) -> None:
+        if getattr(sys, "frozen", False):
+            path = os.path.join(sys.prefix, "libankihelper.dylib")
+        else:
+            path = os.path.join(
+                aqt.utils.aqt_data_folder(), "lib", "libankihelper.dylib"
+            )
+
+        self._dll = CDLL(path)
+
+    def system_is_dark(self) -> bool:
+        return self._dll.system_is_dark()
+
+    def set_darkmode_enabled(self, enabled: bool) -> bool:
+        return self._dll.set_darkmode_enabled(enabled)
+
+    def start_wav_record(self, path: str, on_error: Callable[[str], None]) -> None:
+        global _on_audio_error
+        _on_audio_error = on_error
+        self._dll.start_wav_record(path.encode("utf8"), _audio_error_callback)
+
+    def end_wav_record(self) -> None:
+        "On completion, file should be saved if no error has arrived."
+        self._dll.end_wav_record()
+
+
+# this must not be overwritten or deallocated
+@CFUNCTYPE(None, c_char_p)  # type: ignore
+def _audio_error_callback(msg: str) -> None:
+    if handler := _on_audio_error:
+        handler(msg)
+
+
+_on_audio_error: Callable[[str], None] | None = None
+
+macos_helper: _MacOSHelper | None = None
+if sys.platform == "darwin":
+    try:
+        macos_helper = _MacOSHelper()
+    except Exception as e:
+        print("macos_helper:", e)
diff --git a/qt/aqt/sound.py b/qt/aqt/sound.py
index 00e6f19b6..1f3e5e594 100644
--- a/qt/aqt/sound.py
+++ b/qt/aqt/sound.py
@@ -25,6 +25,7 @@ from anki.cards import Card
 from anki.sound import AV_REF_RE, AVTag, SoundOrVideoTag
 from anki.utils import is_lin, is_mac, is_win, namedtmp
 from aqt import gui_hooks
+from aqt._macos_helper import macos_helper
 from aqt.mpv import MPV, MPVBase, MPVCommandError
 from aqt.qt import *
 from aqt.taskman import TaskManager
@@ -607,6 +608,30 @@ class QtAudioInputRecorder(Recorder):
         t.start(500)
 
 
+# Native macOS recording
+##########################################################################
+
+
+class NativeMacRecorder(Recorder):
+    def __init__(self, output_path: str) -> None:
+        super().__init__(output_path)
+        self._error: str | None = None
+
+    def _on_error(self, msg: str) -> None:
+        self._error = msg
+
+    def start(self, on_done: Callable[[], None]) -> None:
+        self._error = None
+        assert macos_helper
+        macos_helper.start_wav_record(self.output_path, self._on_error)
+        super().start(on_done)
+
+    def stop(self, on_done: Callable[[str], None]) -> None:
+        assert macos_helper
+        macos_helper.end_wav_record()
+        Recorder.stop(self, on_done)
+
+
 # Recording dialog
 ##########################################################################
 
@@ -662,9 +687,14 @@ class RecordDialog(QDialog):
 
     def _start_recording(self) -> None:
         if qtmajor > 5:
-            self._recorder = QtAudioInputRecorder(
-                namedtmp("rec.wav"), self.mw, self._parent
-            )
+            if macos_helper and platform.machine() == "arm64":
+                self._recorder = NativeMacRecorder(
+                    namedtmp("rec.wav"),
+                )
+            else:
+                self._recorder = QtAudioInputRecorder(
+                    namedtmp("rec.wav"), self.mw, self._parent
+                )
         else:
             from aqt.qt.qt5_audio import QtAudioInputRecorder as Qt5Recorder
 
@@ -706,10 +736,6 @@ class RecordDialog(QDialog):
 def record_audio(
     parent: QWidget, mw: aqt.AnkiQt, encode: bool, on_done: Callable[[str], None]
 ) -> None:
-    if sys.platform.startswith("darwin") and platform.machine() == "arm64":
-        showWarning("Recording currently only works in Anki's Intel build")
-        return
-
     def after_record(path: str) -> None:
         if not encode:
             on_done(path)
diff --git a/qt/aqt/theme.py b/qt/aqt/theme.py
index bf01be109..465c9ce05 100644
--- a/qt/aqt/theme.py
+++ b/qt/aqt/theme.py
@@ -4,11 +4,8 @@
 from __future__ import annotations
 
 import enum
-import os
 import platform
 import subprocess
-import sys
-from ctypes import CDLL
 from dataclasses import dataclass
 
 import aqt
@@ -335,27 +332,20 @@ def get_windows_dark_mode() -> bool:
 
 def set_macos_dark_mode(enabled: bool) -> bool:
     "True if setting successful."
-    if not is_mac:
+    from aqt._macos_helper import macos_helper
+
+    if not macos_helper:
         return False
-    try:
-        _ankihelper().set_darkmode_enabled(enabled)
-        return True
-    except Exception as e:
-        # swallow exceptions, as library will fail on macOS 10.13
-        print(e)
-    return False
+    return macos_helper.set_darkmode_enabled(enabled)
 
 
 def get_macos_dark_mode() -> bool:
     "True if macOS system is currently in dark mode."
-    if not is_mac:
-        return False
-    try:
-        return _ankihelper().system_is_dark()
-    except Exception as e:
-        # swallow exceptions, as library will fail on macOS 10.13
-        print(e)
+    from aqt._macos_helper import macos_helper
+
+    if not macos_helper:
         return False
+    return macos_helper.system_is_dark()
 
 
 def get_linux_dark_mode() -> bool:
@@ -378,19 +368,4 @@ def get_linux_dark_mode() -> bool:
     return "-dark" in process.stdout.lower()
 
 
-_ankihelper_dll: CDLL | None = None
-
-
-def _ankihelper() -> CDLL:
-    global _ankihelper_dll
-    if _ankihelper_dll:
-        return _ankihelper_dll
-    if getattr(sys, "frozen", False):
-        path = os.path.join(sys.prefix, "libankihelper.dylib")
-    else:
-        path = os.path.join(aqt.utils.aqt_data_folder(), "lib", "libankihelper.dylib")
-    _ankihelper_dll = CDLL(path)
-    return _ankihelper_dll
-
-
 theme_manager = ThemeManager()
diff --git a/qt/mac/BUILD.bazel b/qt/mac/BUILD.bazel
index 45948e07d..b28232188 100644
--- a/qt/mac/BUILD.bazel
+++ b/qt/mac/BUILD.bazel
@@ -9,6 +9,7 @@ genrule(
     srcs = glob(["*.swift"]),
     outs = ["libankihelper.dylib"],
     cmd = "$(location :helper_build) $@ $(COMPILATION_MODE) $(SRCS)",
+    message = "Compiling Swift dylib",
     tags = ["manual"],
     tools = [":helper_build"],
     visibility = ["//qt:__subpackages__"],
diff --git a/qt/mac/ankihelper.xcodeproj/project.pbxproj b/qt/mac/ankihelper.xcodeproj/project.pbxproj
index 637f03e40..8232fba8e 100644
--- a/qt/mac/ankihelper.xcodeproj/project.pbxproj
+++ b/qt/mac/ankihelper.xcodeproj/project.pbxproj
@@ -8,10 +8,12 @@
 
 /* Begin PBXBuildFile section */
 		137892AC275D90FC009D0B6E /* theme.swift in Sources */ = {isa = PBXBuildFile; fileRef = 137892AB275D90FC009D0B6E /* theme.swift */; };
+		137892B0275DAE22009D0B6E /* record.swift in Sources */ = {isa = PBXBuildFile; fileRef = 137892AF275DAE22009D0B6E /* record.swift */; };
 /* End PBXBuildFile section */
 
 /* Begin PBXFileReference section */
 		137892AB275D90FC009D0B6E /* theme.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = theme.swift; sourceTree = "<group>"; };
+		137892AF275DAE22009D0B6E /* record.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = record.swift; sourceTree = "<group>"; };
 		138B770F2746137F003A3E4F /* libankihelper.dylib */ = {isa = PBXFileReference; explicitFileType = "compiled.mach-o.dylib"; includeInIndex = 0; path = libankihelper.dylib; sourceTree = BUILT_PRODUCTS_DIR; };
 /* End PBXFileReference section */
 
@@ -30,6 +32,7 @@
 			isa = PBXGroup;
 			children = (
 				137892AB275D90FC009D0B6E /* theme.swift */,
+				137892AF275DAE22009D0B6E /* record.swift */,
 				138B77102746137F003A3E4F /* Products */,
 			);
 			sourceTree = "<group>";
@@ -110,6 +113,7 @@
 			isa = PBXSourcesBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
+				137892B0275DAE22009D0B6E /* record.swift in Sources */,
 				137892AC275D90FC009D0B6E /* theme.swift in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
diff --git a/qt/mac/ankihelper.xcodeproj/project.xcworkspace/xcuserdata/dae.xcuserdatad/UserInterfaceState.xcuserstate b/qt/mac/ankihelper.xcodeproj/project.xcworkspace/xcuserdata/dae.xcuserdatad/UserInterfaceState.xcuserstate
index ca596a1eb3edee7b74b87a9d4d8ec1948630333c..ea5377348099ec0d5fcb046ca69fc398d11c5f20 100644
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diff --git a/qt/mac/ankihelper.xcodeproj/xcuserdata/dae.xcuserdatad/xcschemes/ankihelper.xcscheme b/qt/mac/ankihelper.xcodeproj/xcuserdata/dae.xcuserdatad/xcschemes/ankihelper.xcscheme
new file mode 100644
index 000000000..998a3113d
--- /dev/null
+++ b/qt/mac/ankihelper.xcodeproj/xcuserdata/dae.xcuserdatad/xcschemes/ankihelper.xcscheme
@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Scheme
+   version = "1.3">
+   <BuildAction>
+      <BuildActionEntries>
+         <BuildActionEntry
+            buildForRunning = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "138B770E2746137F003A3E4F"
+               BuildableName = "libankihelper.dylib"
+               BlueprintName = "ankihelper"
+               ReferencedContainer = "container:ankihelper.xcodeproj">
+            </BuildableReference>
+         </BuildActionEntry>
+      </BuildActionEntries>
+   </BuildAction>
+   <LaunchAction
+      useCustomWorkingDirectory = "NO"
+      buildConfiguration = "Debug"
+      allowLocationSimulation = "YES">
+   </LaunchAction>
+</Scheme>
diff --git a/qt/mac/record.swift b/qt/mac/record.swift
new file mode 100644
index 000000000..1c22d71ed
--- /dev/null
+++ b/qt/mac/record.swift
@@ -0,0 +1,117 @@
+// Copyright: Ankitects Pty Ltd and contributors
+// License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
+
+import Foundation
+import AVKit
+
+enum RecordError: Error {
+    case noPermission
+    case audioFormat
+    case recordInvoke
+    case stoppedWithFailure
+    case encodingFailure
+}
+
+@_cdecl("start_wav_record")
+public func startWavRecord(
+    path: UnsafePointer<CChar>,
+    onError: @escaping @convention(c) (UnsafePointer<CChar>) -> Void
+) {
+    let url = URL(fileURLWithPath: String(cString: path))
+    AudioRecorder.shared.beginRecording(url: url, onError: { error in
+        error.localizedDescription.withCString { cString in
+            onError(cString)
+        }
+    })
+}
+
+@_cdecl("end_wav_record")
+public func endWavRecord() {
+    AudioRecorder.shared.endRecording()
+}
+
+
+private class AudioRecorder: NSObject, AVAudioRecorderDelegate {
+    static let shared = AudioRecorder()
+
+    private var audioRecorder: AVAudioRecorder?
+    private var onError: ((RecordError) -> Void)?
+
+    func beginRecording(url: URL, onError: @escaping (Error) -> Void) {
+        self.endRecording()
+
+        requestPermission { success in
+            if !success {
+                onError(RecordError.noPermission)
+                return
+            }
+
+            do {
+                try self.beginRecordingInner(url: url)
+            } catch {
+                onError(error)
+                return
+            }
+            self.onError = onError
+        }
+
+    }
+
+    func endRecording() {
+        if let recorder = audioRecorder {
+            recorder.stop()
+        }
+        audioRecorder = nil
+        onError = nil
+    }
+
+    /// Request permission, then call provided callback (true on success).
+    private func requestPermission(completionHandler: @escaping (Bool) -> Void) {
+        switch AVCaptureDevice.authorizationStatus(for: .audio) {
+            case .notDetermined:
+                AVCaptureDevice.requestAccess(
+                    for: .audio,
+                    completionHandler: completionHandler
+                )
+                return
+            case .authorized:
+                completionHandler(true)
+                return
+            case .restricted:
+                print("recording restricted")
+            case .denied:
+                print("recording denied")
+            @unknown default:
+                print("recording unknown permission")
+        }
+        completionHandler(false)
+    }
+
+    private func beginRecordingInner(url: URL) throws {
+        guard let audioFormat = AVAudioFormat.init(
+            commonFormat: .pcmFormatInt16,
+            sampleRate: 44100,
+            channels: 1,
+            interleaved: true
+        ) else {
+            throw RecordError.audioFormat
+        }
+        let recorder = try AVAudioRecorder(url: url, format: audioFormat)
+        if !recorder.record() {
+            throw RecordError.recordInvoke
+        }
+        audioRecorder = recorder
+    }
+
+
+    func audioRecorderDidFinishRecording(_ recorder: AVAudioRecorder, successfully flag: Bool) {
+        if !flag {
+            onError?(.stoppedWithFailure)
+        }
+    }
+
+
+    func audioRecorderEncodeErrorDidOccur(_ recorder: AVAudioRecorder, error: Error?) {
+        onError?(.encodingFailure)
+    }
+}