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submodules/TelegramUI/Sources/AudioRecordningToneData.swift

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+import Foundation
+import AVFoundation
+
+private func loadAudioRecordingToneData() -> Data? {
+    let outputSettings: [String: Any] = [
+        AVFormatIDKey: kAudioFormatLinearPCM as NSNumber,
+        AVSampleRateKey: 44100.0 as NSNumber,
+        AVLinearPCMBitDepthKey: 16 as NSNumber,
+        AVLinearPCMIsNonInterleaved: false as NSNumber,
+        AVLinearPCMIsFloatKey: false as NSNumber,
+        AVLinearPCMIsBigEndianKey: false as NSNumber
+    ]
+    
+    guard let url = Bundle.main.url(forResource: "begin_record", withExtension: "caf") else {
+        return nil
+    }
+    
+    let asset = AVURLAsset(url: url)
+    
+    guard let assetReader = try? AVAssetReader(asset: asset) else {
+        return nil
+    }
+    
+    let readerOutput = AVAssetReaderAudioMixOutput(audioTracks: asset.tracks, audioSettings: outputSettings)
+    
+    if !assetReader.canAdd(readerOutput) {
+        return nil
+    }
+    
+    assetReader.add(readerOutput)
+    
+    if !assetReader.startReading() {
+        return nil
+    }
+    
+    var data = Data()
+    
+    while assetReader.status == .reading {
+        if let nextBuffer = readerOutput.copyNextSampleBuffer() {
+            var abl = AudioBufferList()
+            var blockBuffer: CMBlockBuffer? = nil
+            CMSampleBufferGetAudioBufferListWithRetainedBlockBuffer(nextBuffer, bufferListSizeNeededOut: nil, bufferListOut: &abl, bufferListSize: MemoryLayout<AudioBufferList>.size, blockBufferAllocator: nil, blockBufferMemoryAllocator: nil, flags: kCMSampleBufferFlag_AudioBufferList_Assure16ByteAlignment, blockBufferOut: &blockBuffer)
+            let size = Int(CMSampleBufferGetTotalSampleSize(nextBuffer))
+            if size != 0, let mData = abl.mBuffers.mData {
+                data.append(Data(bytes: mData, count: size))
+            }
+        } else {
+            break
+        }
+    }
+    
+    return data
+}
+
+let audioRecordingToneData: Data? = loadAudioRecordingToneData()