Full Code of AudioKit/Waveform for AI

Repository: AudioKit/Waveform
Branch: main
Commit: 357de1945a36
Files: 31
Total size: 55.0 KB

Directory structure:
gitextract_iqm9pz60/

├── .github/
│   └── workflows/
│       └── tests.yml
├── .gitignore
├── .spi.yml
├── .swiftpm/
│   └── xcode/
│       ├── package.xcworkspace/
│       │   └── contents.xcworkspacedata
│       └── xcshareddata/
│           └── xcschemes/
│               └── Waveform.xcscheme
├── Demo/
│   ├── WaveformDemo/
│   │   ├── Assets.xcassets/
│   │   │   ├── AccentColor.colorset/
│   │   │   │   └── Contents.json
│   │   │   ├── AppIcon.appiconset/
│   │   │   │   └── Contents.json
│   │   │   └── Contents.json
│   │   ├── ContentView.swift
│   │   ├── MinimapView.swift
│   │   ├── Preview Content/
│   │   │   └── Preview Assets.xcassets/
│   │   │       └── Contents.json
│   │   ├── WaveformDemo.entitlements
│   │   └── WaveformDemoApp.swift
│   └── WaveformDemo.xcodeproj/
│       ├── project.pbxproj
│       └── project.xcworkspace/
│           ├── contents.xcworkspacedata
│           └── xcshareddata/
│               └── IDEWorkspaceChecks.plist
├── LICENSE
├── Package.swift
├── README.md
├── Sources/
│   └── Waveform/
│       ├── AVAudio+FloatData.swift
│       ├── Helpers.swift
│       ├── Renderer.swift
│       ├── SampleBuffer.swift
│       ├── Waveform.docc/
│       │   └── Waveform.md
│       ├── Waveform.metal
│       └── Waveform.swift
├── Tests/
│   └── WaveformTests/
│       ├── MTLTexture+Image.swift
│       ├── WaveformTests.swift
│       └── beat.aiff
└── Waveform.playground/
    ├── Contents.swift
    └── contents.xcplayground

================================================
FILE CONTENTS
================================================

================================================
FILE: .github/workflows/tests.yml
================================================
name: Tests

on:
  workflow_dispatch:
  push:
    branches: [main]
  pull_request:
    branches: [main]

jobs:
  build:
    name: Build ${{ matrix.scheme }} (Xcode ${{ matrix.xcode_version }})
    # NOTE: macos-latest is NOT equivalent to macos-12 as of September 2022.
    # Source: https://docs.github.com/en/actions/using-github-hosted-runners/about-github-hosted-runners#supported-runners-and-hardware-resources
    runs-on: macos-12
    strategy:
      # Setting 'fail-fast' to 'true' implies the build will fail the first time it encounters an error.
      fail-fast: false
      matrix:
        xcode_version:
          - '13.2' # swift 5.5
          - '13.4' # swift 5.6
    steps:
      - uses: actions/checkout@v3
      - name: build 
        run: swift build

  # Send notification to Discord on failure.
  send_notification:
    name: Send Notification
    uses: AudioKit/ci/.github/workflows/send_notification.yml@main
    needs: [build]
    if: ${{ failure() && github.ref == 'refs/heads/main' }}
    secrets: inherit


================================================
FILE: .gitignore
================================================
# Xcode
#
# gitignore contributors: remember to update Global/Xcode.gitignore, Objective-C.gitignore & Swift.gitignore

## User settings
xcuserdata/

## compatibility with Xcode 8 and earlier (ignoring not required starting Xcode 9)
*.xcscmblueprint
*.xccheckout

## compatibility with Xcode 3 and earlier (ignoring not required starting Xcode 4)
build/
DerivedData/
*.moved-aside
*.pbxuser
!default.pbxuser
*.mode1v3
!default.mode1v3
*.mode2v3
!default.mode2v3
*.perspectivev3
!default.perspectivev3

## Obj-C/Swift specific
*.hmap

## App packaging
*.ipa
*.dSYM.zip
*.dSYM

## Playgrounds
timeline.xctimeline
playground.xcworkspace

# Swift Package Manager
#
# Add this line if you want to avoid checking in source code from Swift Package Manager dependencies.
# Packages/
# Package.pins
# Package.resolved
# *.xcodeproj
#
# Xcode automatically generates this directory with a .xcworkspacedata file and xcuserdata
# hence it is not needed unless you have added a package configuration file to your project
# .swiftpm

.build/

# CocoaPods
#
# We recommend against adding the Pods directory to your .gitignore. However
# you should judge for yourself, the pros and cons are mentioned at:
# https://guides.cocoapods.org/using/using-cocoapods.html#should-i-check-the-pods-directory-into-source-control
#
# Pods/
#
# Add this line if you want to avoid checking in source code from the Xcode workspace
# *.xcworkspace

# Carthage
#
# Add this line if you want to avoid checking in source code from Carthage dependencies.
# Carthage/Checkouts

Carthage/Build/

# Accio dependency management
Dependencies/
.accio/

# fastlane
#
# It is recommended to not store the screenshots in the git repo.
# Instead, use fastlane to re-generate the screenshots whenever they are needed.
# For more information about the recommended setup visit:
# https://docs.fastlane.tools/best-practices/source-control/#source-control

fastlane/report.xml
fastlane/Preview.html
fastlane/screenshots/**/*.png
fastlane/test_output

# Code Injection
#
# After new code Injection tools there's a generated folder /iOSInjectionProject
# https://github.com/johnno1962/injectionforxcode

iOSInjectionProject/
.DS_Store 

================================================
FILE: .spi.yml
================================================
version: 1
builder:
  configs:
    - documentation_targets: [Waveform]

================================================
FILE: .swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
================================================
<?xml version="1.0" encoding="UTF-8"?>
<Workspace
   version = "1.0">
   <FileRef
      location = "self:">
   </FileRef>
</Workspace>


================================================
FILE: .swiftpm/xcode/xcshareddata/xcschemes/Waveform.xcscheme
================================================
<?xml version="1.0" encoding="UTF-8"?>
<Scheme
   LastUpgradeVersion = "1400"
   version = "1.3">
   <BuildAction
      parallelizeBuildables = "YES"
      buildImplicitDependencies = "YES">
      <BuildActionEntries>
         <BuildActionEntry
            buildForTesting = "YES"
            buildForRunning = "YES"
            buildForProfiling = "YES"
            buildForArchiving = "YES"
            buildForAnalyzing = "YES">
            <BuildableReference
               BuildableIdentifier = "primary"
               BlueprintIdentifier = "Waveform_Waveform"
               BuildableName = "Waveform_Waveform"
               BlueprintName = "Waveform_Waveform"
               ReferencedContainer = "container:">
            </BuildableReference>
         </BuildActionEntry>
         <BuildActionEntry
            buildForTesting = "YES"
            buildForRunning = "YES"
            buildForProfiling = "YES"
            buildForArchiving = "YES"
            buildForAnalyzing = "YES">
            <BuildableReference
               BuildableIdentifier = "primary"
               BlueprintIdentifier = "Waveform_WaveformTests"
               BuildableName = "Waveform_WaveformTests"
               BlueprintName = "Waveform_WaveformTests"
               ReferencedContainer = "container:">
            </BuildableReference>
         </BuildActionEntry>
         <BuildActionEntry
            buildForTesting = "YES"
            buildForRunning = "YES"
            buildForProfiling = "YES"
            buildForArchiving = "YES"
            buildForAnalyzing = "YES">
            <BuildableReference
               BuildableIdentifier = "primary"
               BlueprintIdentifier = "Waveform"
               BuildableName = "Waveform"
               BlueprintName = "Waveform"
               ReferencedContainer = "container:">
            </BuildableReference>
         </BuildActionEntry>
         <BuildActionEntry
            buildForTesting = "YES"
            buildForRunning = "YES"
            buildForProfiling = "NO"
            buildForArchiving = "NO"
            buildForAnalyzing = "YES">
            <BuildableReference
               BuildableIdentifier = "primary"
               BlueprintIdentifier = "WaveformTests"
               BuildableName = "WaveformTests"
               BlueprintName = "WaveformTests"
               ReferencedContainer = "container:">
            </BuildableReference>
         </BuildActionEntry>
      </BuildActionEntries>
   </BuildAction>
   <TestAction
      buildConfiguration = "Debug"
      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
      shouldUseLaunchSchemeArgsEnv = "NO">
      <EnvironmentVariables>
         <EnvironmentVariable
            key = "METAL_DEVICE_WRAPPER_TYPE"
            value = "1"
            isEnabled = "YES">
         </EnvironmentVariable>
      </EnvironmentVariables>
      <Testables>
         <TestableReference
            skipped = "NO">
            <BuildableReference
               BuildableIdentifier = "primary"
               BlueprintIdentifier = "WaveformTests"
               BuildableName = "WaveformTests"
               BlueprintName = "WaveformTests"
               ReferencedContainer = "container:">
            </BuildableReference>
         </TestableReference>
      </Testables>
   </TestAction>
   <LaunchAction
      buildConfiguration = "Debug"
      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
      launchStyle = "0"
      useCustomWorkingDirectory = "NO"
      ignoresPersistentStateOnLaunch = "NO"
      debugDocumentVersioning = "YES"
      debugServiceExtension = "internal"
      allowLocationSimulation = "YES">
   </LaunchAction>
   <ProfileAction
      buildConfiguration = "Release"
      shouldUseLaunchSchemeArgsEnv = "YES"
      savedToolIdentifier = ""
      useCustomWorkingDirectory = "NO"
      debugDocumentVersioning = "YES">
      <MacroExpansion>
         <BuildableReference
            BuildableIdentifier = "primary"
            BlueprintIdentifier = "Waveform_Waveform"
            BuildableName = "Waveform_Waveform"
            BlueprintName = "Waveform_Waveform"
            ReferencedContainer = "container:">
         </BuildableReference>
      </MacroExpansion>
   </ProfileAction>
   <AnalyzeAction
      buildConfiguration = "Debug">
   </AnalyzeAction>
   <ArchiveAction
      buildConfiguration = "Release"
      revealArchiveInOrganizer = "YES">
   </ArchiveAction>
</Scheme>


================================================
FILE: Demo/WaveformDemo/Assets.xcassets/AccentColor.colorset/Contents.json
================================================
{
  "colors" : [
    {
      "idiom" : "universal"
    }
  ],
  "info" : {
    "author" : "xcode",
    "version" : 1
  }
}


================================================
FILE: Demo/WaveformDemo/Assets.xcassets/AppIcon.appiconset/Contents.json
================================================
{
  "images" : [
    {
      "idiom" : "universal",
      "platform" : "ios",
      "size" : "1024x1024"
    },
    {
      "idiom" : "mac",
      "scale" : "1x",
      "size" : "16x16"
    },
    {
      "idiom" : "mac",
      "scale" : "2x",
      "size" : "16x16"
    },
    {
      "idiom" : "mac",
      "scale" : "1x",
      "size" : "32x32"
    },
    {
      "idiom" : "mac",
      "scale" : "2x",
      "size" : "32x32"
    },
    {
      "idiom" : "mac",
      "scale" : "1x",
      "size" : "128x128"
    },
    {
      "idiom" : "mac",
      "scale" : "2x",
      "size" : "128x128"
    },
    {
      "idiom" : "mac",
      "scale" : "1x",
      "size" : "256x256"
    },
    {
      "idiom" : "mac",
      "scale" : "2x",
      "size" : "256x256"
    },
    {
      "idiom" : "mac",
      "scale" : "1x",
      "size" : "512x512"
    },
    {
      "idiom" : "mac",
      "scale" : "2x",
      "size" : "512x512"
    }
  ],
  "info" : {
    "author" : "xcode",
    "version" : 1
  }
}


================================================
FILE: Demo/WaveformDemo/Assets.xcassets/Contents.json
================================================
{
  "info" : {
    "author" : "xcode",
    "version" : 1
  }
}


================================================
FILE: Demo/WaveformDemo/ContentView.swift
================================================
// Copyright AudioKit. All Rights Reserved. Revision History at http://github.com/AudioKit/Waveform/

import AVFoundation
import SwiftUI
import Waveform

class WaveformDemoModel: ObservableObject {
    var samples: SampleBuffer

    init(file: AVAudioFile) {
        let stereo = file.floatChannelData()!
        samples = SampleBuffer(samples: stereo[0])
    }
}

func getFile() -> AVAudioFile {
    let url = Bundle.main.url(forResource: "Piano", withExtension: "mp3")!
    return try! AVAudioFile(forReading: url)
}

func clamp(_ x: Double, _ inf: Double, _ sup: Double) -> Double {
    max(min(x, sup), inf)
}

struct ContentView: View {
    @StateObject var model = WaveformDemoModel(file: getFile())

    @State var start = 0.0
    @State var length = 1.0

    let formatter = NumberFormatter()
    var body: some View {
        VStack {
            ZStack(alignment: .leading) {
                Waveform(samples: model.samples).foregroundColor(.cyan)
                    .padding(.vertical, 5)
                MinimapView(start: $start, length: $length)
            }
            .frame(height: 100)
            .padding()
            Waveform(samples: model.samples,
                     start: Int(start * Double(model.samples.count - 1)),
                     length: Int(length * Double(model.samples.count)))
            .foregroundColor(.blue)
        }
        .padding()
    }
}


================================================
FILE: Demo/WaveformDemo/MinimapView.swift
================================================
// Copyright AudioKit. All Rights Reserved. Revision History at http://github.com/AudioKit/Waveform/

import AVFoundation
import SwiftUI
import Waveform

struct MinimapView: View {
    @Binding var start: Double
    @Binding var length: Double

    @GestureState var initialStart: Double?
    @GestureState var initialLength: Double?

    let indicatorSize = 10.0

    var body: some View {
        GeometryReader { gp in
            RoundedRectangle(cornerRadius: indicatorSize)
                .frame(width: length * gp.size.width)
                .offset(x: start * gp.size.width)
                .opacity(0.3)
                .gesture(DragGesture()
                    .updating($initialStart) { _, state, _ in
                        if state == nil {
                            state = start
                        }
                    }
                    .onChanged { drag in
                        if let initialStart = initialStart {
                            start = clamp(initialStart + drag.translation.width / gp.size.width, 0, 1 - length)
                        }
                    }
                )

            RoundedRectangle(cornerRadius: indicatorSize)
                .foregroundColor(.white)
                .frame(width: indicatorSize).opacity(0.3)
                .offset(x: (start + length) * gp.size.width)
                .padding(indicatorSize)
                .gesture(DragGesture()
                    .updating($initialLength) { _, state, _ in
                        if state == nil {
                            state = length
                        }
                    }
                    .onChanged { drag in
                        if let initialLength = initialLength {
                            length = clamp(initialLength + drag.translation.width / gp.size.width, 0, 1 - start)
                        }
                    }
                )
        }
    }
}


================================================
FILE: Demo/WaveformDemo/Preview Content/Preview Assets.xcassets/Contents.json
================================================
{
  "info" : {
    "author" : "xcode",
    "version" : 1
  }
}


================================================
FILE: Demo/WaveformDemo/WaveformDemo.entitlements
================================================
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>com.apple.security.app-sandbox</key>
    <true/>
    <key>com.apple.security.files.user-selected.read-only</key>
    <true/>
</dict>
</plist>


================================================
FILE: Demo/WaveformDemo/WaveformDemoApp.swift
================================================
import SwiftUI

@main
struct WaveformDemoApp: App {
    var body: some Scene {
        WindowGroup {
            ContentView()
        }
    }
}


================================================
FILE: Demo/WaveformDemo.xcodeproj/project.pbxproj
================================================
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================================================
FILE: Demo/WaveformDemo.xcodeproj/project.xcworkspace/contents.xcworkspacedata
================================================
<?xml version="1.0" encoding="UTF-8"?>
<Workspace
   version = "1.0">
   <FileRef
      location = "self:">
   </FileRef>
</Workspace>


================================================
FILE: Demo/WaveformDemo.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist
================================================
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
	<key>IDEDidComputeMac32BitWarning</key>
	<true/>
</dict>
</plist>


================================================
FILE: LICENSE
================================================
MIT License

Copyright (c) 2022 AudioKit

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.


================================================
FILE: Package.swift
================================================
// swift-tools-version:5.3

import PackageDescription

let package = Package(
    name: "Waveform",
    platforms: [.macOS(.v11), .iOS(.v14)],
    products: [.library(name: "Waveform", targets: ["Waveform"])],
    targets: [
        .target(name: "Waveform", resources: [.process("Waveform.docc")]),
        .testTarget(name: "WaveformTests", dependencies: ["Waveform"], resources: [.copy("beat.aiff")]),
    ]
)


================================================
FILE: README.md
================================================
# Waveform

GPU accelerated SwiftUI waveform view

![waveform-demo](Sources/Waveform/Waveform.docc/Resources/demo.png)

## Documentation

The API Reference can be found on [the AudioKit Website](https://www.audiokit.io/Waveform). 
Package contains a demo project and a playground to help you get started quickly.


================================================
FILE: Sources/Waveform/AVAudio+FloatData.swift
================================================
// Copyright AudioKit. All Rights Reserved. Revision History at http://github.com/AudioKit/Waveform/

import Accelerate
import AVFoundation

extension AVAudioPCMBuffer {
    /// Returns audio data as an `Array` of `Float` Arrays.
    ///
    /// If stereo:
    /// - `floatChannelData?[0]` will contain an Array of left channel samples as `Float`
    /// - `floatChannelData?[1]` will contains an Array of right channel samples as `Float`
    func toFloatChannelData() -> [[Float]]? {
        // Do we have PCM channel data?
        guard let pcmFloatChannelData = floatChannelData else {
            return nil
        }

        let channelCount = Int(format.channelCount)
        let frameLength = Int(self.frameLength)
        let stride = self.stride

        // Preallocate our Array so we're not constantly thrashing while resizing as we append.
        let zeroes: [Float] = Array(repeating: 0, count: frameLength)
        var result = Array(repeating: zeroes, count: channelCount)

        // Loop across our channels...
        for channel in 0 ..< channelCount {
            // Make sure we go through all of the frames...
            for sampleIndex in 0 ..< frameLength {
                result[channel][sampleIndex] = pcmFloatChannelData[channel][sampleIndex * stride]
            }
        }

        return result
    }
}

extension AVAudioFile {
    /// converts to a 32 bit PCM buffer
    func toAVAudioPCMBuffer() -> AVAudioPCMBuffer? {
        guard let buffer = AVAudioPCMBuffer(pcmFormat: processingFormat,
                                            frameCapacity: AVAudioFrameCount(length)) else { return nil }

        do {
            framePosition = 0
            try read(into: buffer)
            print("Created buffer with format")

        } catch let error as NSError {
            print("Cannot read into buffer " + error.localizedDescription)
        }

        return buffer
    }

    /// converts to Swift friendly Float array
    public func floatChannelData() -> [[Float]]? {
        guard let pcmBuffer = toAVAudioPCMBuffer(),
              let data = pcmBuffer.toFloatChannelData() else { return nil }
        return data
    }
}


================================================
FILE: Sources/Waveform/Helpers.swift
================================================
// Copyright AudioKit. All Rights Reserved. Revision History at http://github.com/AudioKit/Waveform/

import Foundation
import Metal
import SwiftUI

#if canImport(UIKit)
import UIKit
#elseif canImport(AppKit)
import AppKit
#endif

/// Returns the minimums of chunks of binSize.
func binMin(samples: [Float], binSize: Int) -> [Float] {
    var out: [Float] = .init(repeating: 0.0, count: samples.count / binSize)

    // Note: we have to use a dumb while loop to avoid swift's Range and have
    //       decent perf in debug.
    var bin = 0
    while bin < out.count {

        // Note: we could do the following but it's too slow in debug
        // out[bin] = samples[(bin * binSize) ..< ((bin + 1) * binSize)].min()!

        var v = Float.greatestFiniteMagnitude
        let start: Int = bin * binSize
        let end: Int = (bin + 1) * binSize
        var i = start
        while i < end {
            v = min(samples[i], v)
            i += 1
        }
        out[bin] = v
        bin += 1
    }
    return out
}

/// Returns the maximums of chunks of binSize.
func binMax(samples: [Float], binSize: Int) -> [Float] {
    var out: [Float] = .init(repeating: 0.0, count: samples.count / binSize)

    // Note: we have to use a dumb while loop to avoid swift's Range and have
    //       decent perf in debug.
    var bin = 0
    while bin < out.count {

        // Note: we could do the following but it's too slow in debug
        // out[bin] = samples[(bin * binSize) ..< ((bin + 1) * binSize)].max()!

        var v = -Float.greatestFiniteMagnitude
        let start: Int = bin * binSize
        let end: Int = (bin + 1) * binSize
        var i = start
        while i < end {
            v = max(samples[i], v)
            i += 1
        }
        out[bin] = v
        bin += 1
    }
    return out
}

extension MTLDevice {
    func makeBuffer(_ values: [Float]) -> MTLBuffer? {
        makeBuffer(bytes: values, length: MemoryLayout<Float>.size * values.count)
    }
}

public extension MTLRenderCommandEncoder {
    func setFragmentBytes<T>(_ value: T, index: Int) {
        var copy = value
        setFragmentBytes(&copy, length: MemoryLayout<T>.size, index: index)
    }

    func setFragmentBytes<T>(_ value: T, index: Int32) {
        var copy = value
        setFragmentBytes(&copy, length: MemoryLayout<T>.size, index: Int(index))
    }
}

extension Color {
    var components: SIMD4<Float> {

        var r: CGFloat = 0
        var g: CGFloat = 0
        var b: CGFloat = 0
        var a: CGFloat = 0

        #if canImport(UIKit)
        UIColor(self).getRed(&r, green: &g, blue: &b, alpha: &a)
        #elseif canImport(AppKit)
        NSColor(self).usingColorSpace(.deviceRGB)!.getRed(&r, green: &g, blue: &b, alpha: &a)
        #endif

        return .init(Float(r), Float(g), Float(b), Float(a))
    }
}


================================================
FILE: Sources/Waveform/Renderer.swift
================================================
// Copyright AudioKit. All Rights Reserved. Revision History at http://github.com/AudioKit/Waveform/

import Foundation
import Metal
import MetalKit
import SwiftUI

let MaxBuffers = 3

/// Parameters defining the look and feel of the waveform
struct Constants {

    /// Foreground color
    var color = SIMD4<Float>(1,1,1,1)

    /// Initialize the Constants structure
    /// - Parameter color: Foreground color
    init(color: Color = .white) {
        self.color = color.components
    }
}

class Renderer: NSObject, MTKViewDelegate {
    var device: MTLDevice!
    var queue: MTLCommandQueue!
    var pipeline: MTLRenderPipelineState!
    var source = ""
    public var constants = Constants()

    private let inflightSemaphore = DispatchSemaphore(value: MaxBuffers)

    var minBuffers: [MTLBuffer] = []
    var maxBuffers: [MTLBuffer] = []

    var samples = SampleBuffer(samples: [0])
    var start = 0
    var length = 0

    init(device: MTLDevice) {
        self.device = device
        queue = device.makeCommandQueue()

        let library = try! device.makeDefaultLibrary(bundle: Bundle.module)

        let rpd = MTLRenderPipelineDescriptor()
        rpd.vertexFunction = library.makeFunction(name: "waveform_vert")
        rpd.fragmentFunction = library.makeFunction(name: "waveform_frag")

        let colorAttachment = rpd.colorAttachments[0]!
        colorAttachment.pixelFormat = .bgra8Unorm
        colorAttachment.isBlendingEnabled = true
        colorAttachment.sourceRGBBlendFactor = .sourceAlpha
        colorAttachment.sourceAlphaBlendFactor = .sourceAlpha
        colorAttachment.destinationRGBBlendFactor = .oneMinusSourceAlpha
        colorAttachment.destinationAlphaBlendFactor = .oneMinusSourceAlpha

        pipeline = try! device.makeRenderPipelineState(descriptor: rpd)

        minBuffers = [device.makeBuffer([0])!]
        maxBuffers = [device.makeBuffer([0])!]

        super.init()
    }

    func mtkView(_: MTKView, drawableSizeWillChange _: CGSize) {}

    func selectBuffers(width: CGFloat) -> (MTLBuffer?, MTLBuffer?) {
        var level = 0
        for (minBuffer, maxBuffer) in zip(minBuffers, maxBuffers) {
            if CGFloat(minBuffer.length / MemoryLayout<Float>.size) < width {
                return (minBuffer, maxBuffer)
            }
            level += 1
        }

        // Use optional binding to safely access last element of each array
        if let minBufferLast = minBuffers.last, let maxBufferLast = maxBuffers.last {
            return (minBufferLast, maxBufferLast)
        } else {
            // If either array is empty, return nil
            return (nil, nil)
        }
    }
    
    func encode(to commandBuffer: MTLCommandBuffer,
                pass: MTLRenderPassDescriptor,
                width: CGFloat)
    {
        pass.colorAttachments[0].clearColor = MTLClearColorMake(0, 0, 0, 0)

        let highestResolutionCount = Float(samples.samples.count)
        let startFactor = Float(start) / highestResolutionCount
        let lengthFactor = Float(length) / highestResolutionCount

        let (minBufferOpt, maxBufferOpt) = selectBuffers(width: width / CGFloat(lengthFactor))
        guard let minBuffer = minBufferOpt, let maxBuffer = maxBufferOpt else {
            //early return to gracefully fail.
            return
        }

        let enc = commandBuffer.makeRenderCommandEncoder(descriptor: pass)!
        enc.setRenderPipelineState(pipeline)

        let bufferLength = Float(minBuffer.length / MemoryLayout<Float>.size)
        let bufferStart = Int(bufferLength * startFactor)
        var bufferCount = Int(bufferLength * lengthFactor)

        enc.setFragmentBuffer(minBuffer, offset: bufferStart * MemoryLayout<Float>.size, index: 0)
        enc.setFragmentBuffer(maxBuffer, offset: bufferStart * MemoryLayout<Float>.size, index: 1)
        assert(minBuffer.length == maxBuffer.length)
        enc.setFragmentBytes(&bufferCount, length: MemoryLayout<Int32>.size, index: 2)
        let c = [constants]
        enc.setFragmentBytes(c, length: MemoryLayout<Constants>.size, index: 3)
        enc.drawPrimitives(type: .triangleStrip, vertexStart: 0, vertexCount: 4)
        enc.endEncoding()
    }

    func draw(in view: MTKView) {
        let size = view.frame.size
        let w = Float(size.width)
        let h = Float(size.height)
        // let scale = Float(view.contentScaleFactor)

        if w == 0 || h == 0 {
            return
        }

        // use semaphore to encode 3 frames ahead
        _ = inflightSemaphore.wait(timeout: DispatchTime.distantFuture)

        let commandBuffer = queue.makeCommandBuffer()!

        let semaphore = inflightSemaphore
        commandBuffer.addCompletedHandler { _ in
            semaphore.signal()
        }

        if let renderPassDescriptor = view.currentRenderPassDescriptor, let currentDrawable = view.currentDrawable {
            encode(to: commandBuffer, pass: renderPassDescriptor, width: size.width)

            commandBuffer.present(currentDrawable)
        }
        commandBuffer.commit()
    }

    func set(samples: SampleBuffer, start: Int, length: Int) {
        self.start = start
        self.length = length
        if samples === self.samples {
            return
        }
        self.samples = samples

        let buffers = makeBuffers(device: device, samples: samples)
        self.minBuffers = buffers.0
        self.maxBuffers = buffers.1
    }
}

func makeBuffers(device: MTLDevice, samples: SampleBuffer) -> ([MTLBuffer], [MTLBuffer]) {
    var minSamples = samples.samples
    var maxSamples = samples.samples

    var s = samples.samples.count
    var minBuffers: [MTLBuffer] = []
    var maxBuffers: [MTLBuffer] = []
    while s > 2 {
        minBuffers.append(device.makeBuffer(minSamples)!)
        maxBuffers.append(device.makeBuffer(maxSamples)!)

        minSamples = binMin(samples: minSamples, binSize: 2)
        maxSamples = binMax(samples: maxSamples, binSize: 2)
        s /= 2
    }
    return (minBuffers, maxBuffers)
}


================================================
FILE: Sources/Waveform/SampleBuffer.swift
================================================
// Copyright AudioKit. All Rights Reserved. Revision History at http://github.com/AudioKit/Waveform/

import Foundation

/// Immutable data for samples so we can quickly compare to see if we should recompute.
public final class SampleBuffer: Sendable {
    let samples: [Float]

    /// Initialize the buffer with samples
    public init(samples: [Float]) {
        self.samples = samples
    }

    /// Number of samples
    public var count: Int {
        samples.count
    }
}


================================================
FILE: Sources/Waveform/Waveform.docc/Waveform.md
================================================
# ``Waveform``

GPU accelerated SwiftUI waveform view

## Overview

Code is hosted on Github: [](https://github.com/AudioKit/Waveform/)

![Demo Screenshot](demo)

## Topics

### <!--@START_MENU_TOKEN@-->Group<!--@END_MENU_TOKEN@-->

- <!--@START_MENU_TOKEN@-->``Symbol``<!--@END_MENU_TOKEN@-->


================================================
FILE: Sources/Waveform/Waveform.metal
================================================
// Copyright AudioKit. All Rights Reserved. Revision History at http://github.com/AudioKit/Waveform/

#include <metal_stdlib>
using namespace metal;

kernel void waveform_bin(device const float* in,
                         device float* out_min,
                         device float* out_max,
                         constant uint& count,
                         uint tid [[ thread_position_in_grid]]) {
    
    if (tid >= count) {
        return;
    }
    
    auto a = in[tid*2];
    auto b = in[tid*2+1];
    out_min[tid] = min(a, b);
    out_max[tid] = max(a, b);
}

struct FragIn {
    float4 position [[ position ]];
    float2 uv; // (0, 1) x (-1, 1)
};


constant float2 pos[4] = { {-1,-1}, {1,-1}, {-1,1}, {1,1 } };
constant float2 uv[4] = { {0, -1}, {1, -1}, {0,1}, {1,1 } };

vertex FragIn waveform_vert(uint id [[ vertex_id ]]) {
    FragIn out;
    out.position = float4(pos[id], 0, 1);
    out.uv = uv[id];
    return out;
}

struct Constants {
    float4 color;
};

float sample_waveform(device const float* min_waveform,
                      device const float* max_waveform,
                      uint count,
                      float2 uv) {

    int x = clamp(int(count * uv.x), 0, int(count));

    auto min_value = min_waveform[x];
    auto max_value = max_waveform[x];
    
    auto falloff = 4 * length(fwidth(uv));
    
    // Feather the top and bottom.
    auto s0 = smoothstep(min_value - falloff, min_value, uv.y);
    auto s1 = 1.0 - smoothstep(max_value, max_value + falloff, uv.y);

    return s0 * s1;
}

fragment half4 waveform_frag(FragIn in   [[ stage_in ]],
                             device const float* min_waveform,
                             device const float* max_waveform,
                             constant uint& count,
                             constant Constants& constants) {
    
    half s = sample_waveform(min_waveform, max_waveform, count, in.uv);

    half4 color = half4(constants.color);
    color.a *= s;
    return color;

}


================================================
FILE: Sources/Waveform/Waveform.swift
================================================
// Copyright AudioKit. All Rights Reserved. Revision History at http://github.com/AudioKit/Waveform/

import AVFoundation
import MetalKit
import SwiftUI

#if os(macOS)
/// Waveform SwiftUI View
public struct Waveform: NSViewRepresentable {
    var samples: SampleBuffer
    var start: Int
    var length: Int
    var constants: Constants = Constants()


    /// Initialize the waveform
    /// - Parameters:
    ///   - samples: All samples able to be displayed
    ///   - start: Which sample on which to start displaying samples
    ///   - length: The width of the entire waveform in samples
    ///   - constants: Look and feel parameters for the waveform
    public init(samples: SampleBuffer, start: Int = 0, length: Int = 0) {
        self.samples = samples
        self.start = start
        if length > 0 {
            self.length = min(length, samples.samples.count - start)
        } else {
            self.length = samples.samples.count - start
        }
    }

    /// Class required by NSViewRepresentable
    public class Coordinator {
        var renderer: Renderer

        init(constants: Constants) {
            renderer = Renderer(device: MTLCreateSystemDefaultDevice()!)
            renderer.constants = constants
        }
    }

    /// Required by NSViewRepresentable
    public func makeCoordinator() -> Coordinator {
        return Coordinator(constants: constants)
    }

    /// Required by NSViewRepresentable
    public func makeNSView(context: Context) -> some NSView {
        let metalView = MTKView(frame: CGRect(x: 0, y: 0, width: 1024, height: 768),
                                device: MTLCreateSystemDefaultDevice()!)
        metalView.enableSetNeedsDisplay = true
        metalView.isPaused = true
        metalView.delegate = context.coordinator.renderer
        metalView.layer?.isOpaque = false
        return metalView
    }

    /// Required by NSViewRepresentable
    public func updateNSView(_ nsView: NSViewType, context: Context) {
        let renderer = context.coordinator.renderer
        renderer.constants = constants
        renderer.set(samples: samples, start: start, length: length)
        nsView.setNeedsDisplay(nsView.bounds)
    }
}
#else
/// Waveform SwiftUI View
public struct Waveform: UIViewRepresentable {
    var samples: SampleBuffer
    var start: Int
    var length: Int
    var constants: Constants = Constants()

    /// Initialize the waveform
    /// - Parameters:
    ///   - samples: All samples able to be displayed
    ///   - start: Which sample on which to start displaying samples
    ///   - length: The width of the entire waveform in samples
    ///   - constants: Look and feel parameters for the waveform
    public init(samples: SampleBuffer, start: Int = 0, length: Int = 0) {
        self.samples = samples
        self.start = start
        if length > 0 {
            self.length = length
        } else {
            self.length = samples.samples.count
        }
    }

    /// Required by UIViewRepresentable
    public class Coordinator {
        var renderer: Renderer

        init(constants: Constants) {
            renderer = Renderer(device: MTLCreateSystemDefaultDevice()!)
        }
    }

    /// Required by UIViewRepresentable
    public func makeCoordinator() -> Coordinator {
        return Coordinator(constants: constants)
    }

    /// Required by UIViewRepresentable
    public func makeUIView(context: Context) -> some UIView {
        let metalView = MTKView(frame: CGRect(x: 0, y: 0, width: 1024, height: 768),
                                device: MTLCreateSystemDefaultDevice()!)
        metalView.enableSetNeedsDisplay = true
        metalView.isPaused = true
        metalView.delegate = context.coordinator.renderer
        metalView.layer.isOpaque = false
        return metalView
    }

    /// Required by UIViewRepresentable
    public func updateUIView(_ uiView: UIViewType, context: Context) {
        let renderer = context.coordinator.renderer
        renderer.constants = constants
        renderer.set(samples: samples, start: start, length: length)
        uiView.setNeedsDisplay()
    }
}
#endif

extension Waveform {
    /// Modifer to change the foreground color of the wheel
    /// - Parameter foregroundColor: foreground color
    public func foregroundColor(_ foregroundColor: Color) -> Waveform {
        var copy = self
        copy.constants = Constants(color: foregroundColor)
        return copy
    }
}


================================================
FILE: Tests/WaveformTests/MTLTexture+Image.swift
================================================
// Copyright AudioKit. All Rights Reserved. Revision History at http://github.com/AudioKit/Waveform/

import CoreGraphics
import Foundation
import Metal

func createImage(data: UnsafeMutablePointer<UInt8>, w: Int, h: Int) -> CGImage {
    let dataSize = 4 * w * h

    let provider = CGDataProvider(dataInfo: nil, data: data, size: dataSize, releaseData: { _, _, _ in })!

    let colorSpace = CGColorSpaceCreateDeviceRGB()

    let image = CGImage(width: w,
                        height: h,
                        bitsPerComponent: 8,
                        bitsPerPixel: 32,
                        bytesPerRow: w * 4,
                        space: colorSpace,
                        bitmapInfo: .init(rawValue: CGImageAlphaInfo.noneSkipLast.rawValue),
                        provider: provider,
                        decode: nil,
                        shouldInterpolate: true,
                        intent: .defaultIntent)!

    return image
}

extension MTLTexture {
    var cgImage: CGImage {
        let dataSize = width * height * 4
        let ptr = UnsafeMutablePointer<UInt8>.allocate(capacity: dataSize)

        switch pixelFormat {
        case .bgra8Unorm:
            getBytes(ptr, bytesPerRow: width * 4, from: MTLRegionMake2D(0, 0, width, height), mipmapLevel: 0)
            for i in 0 ..< (width * height) {
                swap(&ptr[4 * i], &ptr[4 * i + 2])
            }
        default:
            fatalError()
        }

        return createImage(data: ptr, w: width, h: height)
    }

    var isBlack: Bool {
        let dataSize = width * height * 4
        let ptr = UnsafeMutablePointer<UInt8>.allocate(capacity: dataSize)
        defer {
            ptr.deallocate()
        }

        switch pixelFormat {
        case .bgra8Unorm:
            getBytes(ptr, bytesPerRow: width * 4, from: MTLRegionMake2D(0, 0, width, height), mipmapLevel: 0)
        default:
            fatalError()
        }

        for x in 0 ..< dataSize {
            if ptr[x] != 0 {
                return false
            }
        }

        return true
    }
}


================================================
FILE: Tests/WaveformTests/WaveformTests.swift
================================================
// Copyright AudioKit. All Rights Reserved. Revision History at http://github.com/AudioKit/Waveform/

import AVFoundation
import CoreFoundation
import CoreGraphics
import Metal
import MetalKit
@testable import Waveform
import XCTest

final class WaveformTests: XCTestCase {
    let device = MTLCreateSystemDefaultDevice()
    var queue: MTLCommandQueue!
    var texture: MTLTexture!
    var pass: MTLRenderPassDescriptor!

    override func setUp() {
        guard let device = device else { return }
        queue = device.makeCommandQueue()!

        let w = 512
        let h = 512

        let textureDesc = MTLTextureDescriptor()
        textureDesc.pixelFormat = .bgra8Unorm
        textureDesc.width = w
        textureDesc.height = h

        textureDesc.usage = [.renderTarget, .shaderRead, .shaderWrite]

        texture = device.makeTexture(descriptor: textureDesc)
        XCTAssertNotNil(texture)

        pass = MTLRenderPassDescriptor()
        pass.colorAttachments[0].texture = texture
        pass.colorAttachments[0].storeAction = .store
        pass.colorAttachments[0].loadAction = .clear
    }

    func writeCGImage(image: CGImage, url: CFURL) {
        #if os(macOS)
        let dest = CGImageDestinationCreateWithURL(url, kUTTypePNG, 1, nil)!
        CGImageDestinationAddImage(dest, image, nil)
        assert(CGImageDestinationFinalize(dest))
        #endif
    }

    func showTexture(texture: MTLTexture, name: String) {
        let tmpURL = FileManager.default.temporaryDirectory.appendingPathComponent(name)
        print("saving to \(tmpURL)")
        writeCGImage(image: texture.cgImage, url: tmpURL as CFURL)
    }

    func render(samples: [Float]) async {
        guard let device = device else { return }
        let renderer = Renderer(device: device)

        await renderer.set(samples: SampleBuffer(samples: samples), start: 0, length: samples.count)

        let commandBuffer = queue.makeCommandBuffer()!
        renderer.encode(to: commandBuffer, pass: pass, width: 512)

        #if os(macOS)
        let blit = commandBuffer.makeBlitCommandEncoder()!
        blit.synchronize(resource: texture)
        blit.endEncoding()
        #endif

        commandBuffer.commit()
        commandBuffer.waitUntilCompleted()

        XCTAssertFalse(texture.isBlack)

        showTexture(texture: texture, name: "Waveform.png")
    }

    func testRenderBeat() async throws {
        guard let url = Bundle.module.url(forResource: "beat", withExtension: "aiff") else {
            XCTFail()
            return
        }

        let file = try! AVAudioFile(forReading: url)

        let stereo = file.floatChannelData()!

        await render(samples: stereo[0])
    }
}


================================================
FILE: Waveform.playground/Contents.swift
================================================
import PlaygroundSupport
import SwiftUI
import Waveform

struct WaveformDemoView: View {
    var samples: [Float] {
        var s: [Float] = []
        let size = 1000
        for i in 0 ..< size {
            let sine = sin(Float(i * 2) * .pi / Float(size)) * 0.9
            s.append(sine + 0.1 * Float.random(in: -1 ... 1))
        }
        return s
    }

    @State var start = 0.0
    @State var length = 1.0

    let formatter = NumberFormatter()
    var body: some View {
        Waveform(samples: SampleBuffer(samples: samples),
                 start: 0,
                 length: 1000)
            .padding()
    }
}

PlaygroundPage.current.setLiveView(WaveformDemoView().frame(width: 1100, height: 500))
PlaygroundPage.current.needsIndefiniteExecution = true


================================================
FILE: Waveform.playground/contents.xcplayground
================================================
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<playground version='5.0' target-platform='macos' display-mode='rendered' buildActiveScheme='true' executeOnSourceChanges='true' importAppTypes='true'>
    <timeline fileName='timeline.xctimeline'/>
</playground>