-
Notifications
You must be signed in to change notification settings - Fork 57
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
* Allow playing custom streams This lets users implement custom streams that can be played. For example, I have a websocket interface that I fetch data from. I can wrap that stream into a CoreAudioStreamSource and add that to the player. * Add example of using a custom stream * Add ability to queue custom streams
- Loading branch information
Showing
8 changed files
with
226 additions
and
35 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
139 changes: 139 additions & 0 deletions
139
AudioPlayer/AudioPlayer/Content/AudioPlayer/CustomStreamSource.swift
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,139 @@ | ||
| // | ||
| // CustomStreamSource.swift | ||
| // AudioPlayer | ||
| // | ||
| // Created by Jackson Harper on 12/9/24. | ||
| // | ||
|
|
||
| import AVFoundation | ||
| import Foundation | ||
|
|
||
| import AudioStreaming | ||
|
|
||
| // This is a basic example of playing a custom audio stream. We generate | ||
| // a small audio data on load and then pass it off to AudioStreaming. | ||
| final class CustomStreamAudioSource: NSObject, CoreAudioStreamSource { | ||
| weak var delegate: AudioStreamSourceDelegate? | ||
|
|
||
| var underlyingQueue: DispatchQueue | ||
|
|
||
| var position = 0 | ||
| var length = 0 | ||
|
|
||
| var audioFileHint: AudioFileTypeID { | ||
| kAudioFileWAVEType | ||
| } | ||
|
|
||
| init(underlyingQueue: DispatchQueue) { | ||
| self.underlyingQueue = underlyingQueue | ||
| } | ||
|
|
||
| // no-op | ||
| func close() {} | ||
|
|
||
| // no-op | ||
| func suspend() {} | ||
|
|
||
| func resume() {} | ||
|
|
||
| func seek(at _: Int) { | ||
| // The streaming process is started by a seek(0) call from AudioStreaming | ||
| generateData() | ||
| } | ||
|
|
||
| private func generateData() { | ||
| let frequency = 440.0 | ||
| let sampleRate = 44100 | ||
| let duration = 20.0 | ||
|
|
||
| let lpcmData = generateSineWave(frequency: frequency, sampleRate: sampleRate, duration: duration) | ||
| let waveFile = createWavFile(using: lpcmData) | ||
|
|
||
| // We enqueue this because during startup the seek call will be made, but the player | ||
| // is not completely setup and ready to handle data yet, as its expected to be | ||
| // generated asyncronously. | ||
| underlyingQueue.asyncAfter(deadline: .now().advanced(by: .milliseconds(100))) { | ||
| self.delegate?.dataAvailable(source: self, data: waveFile) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| // Functions for generating some sample data | ||
|
|
||
| // Function to generate a sine wave as Data | ||
| func generateSineWave(frequency: Double, sampleRate: Int, duration: Double, amplitude: Double = 0.5) -> Data { | ||
| let numberOfSamples = Int(Double(sampleRate) * duration) | ||
| let twoPi = 2.0 * Double.pi | ||
| var lpcmData = Data() | ||
|
|
||
| for sampleIndex in 0 ..< numberOfSamples { | ||
| let time = Double(sampleIndex) / Double(sampleRate) | ||
| let sampleValue = amplitude * sin(twoPi * frequency * time) | ||
|
|
||
| let pcmValue = Int16(sampleValue * Double(Int16.max)) | ||
| withUnsafeBytes(of: pcmValue.littleEndian) { lpcmData.append(contentsOf: $0) } | ||
| } | ||
|
|
||
| return lpcmData | ||
| } | ||
|
|
||
| func createWavFile(using rawData: Data) -> Data { | ||
| let waveHeaderFormate = createWaveHeader(data: rawData) as Data | ||
| let waveFileData = waveHeaderFormate + rawData | ||
| return waveFileData | ||
| } | ||
|
|
||
| // from: https://stackoverflow.com/questions/49399823/in-ios-how-to-create-audio-file-wav-mp3-file-from-data | ||
| private func createWaveHeader(data: Data) -> NSData { | ||
| let sampleRate: Int32 = 44100 | ||
| let chunkSize: Int32 = 36 + Int32(data.count) | ||
| let subChunkSize: Int32 = 16 | ||
| let format: Int16 = 1 | ||
| let channels: Int16 = 2 | ||
| let bitsPerSample: Int16 = 16 | ||
| let byteRate: Int32 = sampleRate * Int32(channels * bitsPerSample / 8) | ||
| let blockAlign: Int16 = channels * bitsPerSample / 8 | ||
| let dataSize = Int32(data.count) | ||
|
|
||
| let header = NSMutableData() | ||
|
|
||
| header.append([UInt8]("RIFF".utf8), length: 4) | ||
| header.append(intToByteArray(chunkSize), length: 4) | ||
|
|
||
| // WAVE | ||
| header.append([UInt8]("WAVE".utf8), length: 4) | ||
|
|
||
| // FMT | ||
| header.append([UInt8]("fmt ".utf8), length: 4) | ||
|
|
||
| header.append(intToByteArray(subChunkSize), length: 4) | ||
| header.append(shortToByteArray(format), length: 2) | ||
| header.append(shortToByteArray(channels), length: 2) | ||
| header.append(intToByteArray(sampleRate), length: 4) | ||
| header.append(intToByteArray(byteRate), length: 4) | ||
| header.append(shortToByteArray(blockAlign), length: 2) | ||
| header.append(shortToByteArray(bitsPerSample), length: 2) | ||
|
|
||
| header.append([UInt8]("data".utf8), length: 4) | ||
| header.append(intToByteArray(dataSize), length: 4) | ||
|
|
||
| return header | ||
| } | ||
|
|
||
| private func intToByteArray(_ i: Int32) -> [UInt8] { | ||
| return [ | ||
| // little endian | ||
| UInt8(truncatingIfNeeded: i & 0xFF), | ||
| UInt8(truncatingIfNeeded: (i >> 8) & 0xFF), | ||
| UInt8(truncatingIfNeeded: (i >> 16) & 0xFF), | ||
| UInt8(truncatingIfNeeded: (i >> 24) & 0xFF), | ||
| ] | ||
| } | ||
|
|
||
| private func shortToByteArray(_ i: Int16) -> [UInt8] { | ||
| return [ | ||
| // little endian | ||
| UInt8(truncatingIfNeeded: i & 0xFF), | ||
| UInt8(truncatingIfNeeded: (i >> 8) & 0xFF), | ||
| ] | ||
| } |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Oops, something went wrong.