Add Swift API for KittenTTS (#2476)

@@ -9,6 +9,10 @@ ls -lh
 
 ./run-test-version.sh
 
+./run-tts-kitten-en.sh
+ls -lh
+rm -rf kitten-*
+
 ./run-zipformer-ctc-asr.sh
 rm -rf sherpa-onnx-zipformer-*
 

@@ -20,3 +20,4 @@ decode-file-sense-voice-with-hr
 test-version
 zipformer-ctc-asr
 dolphin-ctc-asr
+tts-kitten-en

@@ -884,13 +884,30 @@ func sherpaOnnxOfflineTtsKokoroModelConfig(
   )
 }
 
+func sherpaOnnxOfflineTtsKittenModelConfig(
+  model: String = "",
+  voices: String = "",
+  tokens: String = "",
+  dataDir: String = "",
+  lengthScale: Float = 1.0
+) -> SherpaOnnxOfflineTtsKittenModelConfig {
+  return SherpaOnnxOfflineTtsKittenModelConfig(
+    model: toCPointer(model),
+    voices: toCPointer(voices),
+    tokens: toCPointer(tokens),
+    data_dir: toCPointer(dataDir),
+    length_scale: lengthScale
+  )
+}
+
 func sherpaOnnxOfflineTtsModelConfig(
   vits: SherpaOnnxOfflineTtsVitsModelConfig = sherpaOnnxOfflineTtsVitsModelConfig(),
   matcha: SherpaOnnxOfflineTtsMatchaModelConfig = sherpaOnnxOfflineTtsMatchaModelConfig(),
   kokoro: SherpaOnnxOfflineTtsKokoroModelConfig = sherpaOnnxOfflineTtsKokoroModelConfig(),
   numThreads: Int = 1,
   debug: Int = 0,
-  provider: String = "cpu"
+  provider: String = "cpu",
+  kitten: SherpaOnnxOfflineTtsKittenModelConfig = sherpaOnnxOfflineTtsKittenModelConfig()
 ) -> SherpaOnnxOfflineTtsModelConfig {
   return SherpaOnnxOfflineTtsModelConfig(
     vits: vits,
@@ -898,7 +915,8 @@ func sherpaOnnxOfflineTtsModelConfig(
     debug: Int32(debug),
     provider: toCPointer(provider),
     matcha: matcha,
-    kokoro: kokoro
+    kokoro: kokoro,
+    kitten: kitten
   )
 }
 

+#!/usr/bin/env bash
+
+set -ex
+
+if [ ! -d ../build-swift-macos ]; then
+  echo "Please run ../build-swift-macos.sh first!"
+  exit 1
+fi
+
+# please visit
+# https://k2-fsa.github.io/sherpa/onnx/tts/pretrained_models/kitten.html
+# to download more models
+if [ ! -f ./kitten-nano-en-v0_1-fp16/model.fp16.onnx ]; then
+  curl -SL -O https://github.com/k2-fsa/sherpa-onnx/releases/download/tts-models/kitten-nano-en-v0_1-fp16.tar.bz2
+  tar xf kitten-nano-en-v0_1-fp16.tar.bz2
+  rm kitten-nano-en-v0_1-fp16.tar.bz2
+fi
+
+if [ ! -e ./tts-kitten-en ]; then
+  # Note: We use -lc++ to link against libc++ instead of libstdc++
+  swiftc \
+    -lc++ \
+    -I ../build-swift-macos/install/include \
+    -import-objc-header ./SherpaOnnx-Bridging-Header.h \
+    ./tts-kitten-en.swift  ./SherpaOnnx.swift \
+    -L ../build-swift-macos/install/lib/ \
+    -l sherpa-onnx \
+    -l onnxruntime \
+    -o tts-kitten-en
+
+  strip tts-kitten-en
+else
+  echo "./tts-kitten-en exists - skip building"
+fi
+
+export DYLD_LIBRARY_PATH=$PWD/../build-swift-macos/install/lib:$DYLD_LIBRARY_PATH
+./tts-kitten-en

+class MyClass {
+  func playSamples(samples: [Float]) {
+    print("Play \(samples.count) samples")
+  }
+}
+
+func run() {
+  let model = "./kitten-nano-en-v0_1-fp16/model.fp16.onnx"
+  let voices = "./kitten-nano-en-v0_1-fp16/voices.bin"
+  let tokens = "./kitten-nano-en-v0_1-fp16/tokens.txt"
+  let dataDir = "./kitten-nano-en-v0_1-fp16/espeak-ng-data"
+  let kitten = sherpaOnnxOfflineTtsKittenModelConfig(
+    model: model,
+    voices: voices,
+    tokens: tokens,
+    dataDir: dataDir
+  )
+  let modelConfig = sherpaOnnxOfflineTtsModelConfig(debug: 0, kitten: kitten)
+  var ttsConfig = sherpaOnnxOfflineTtsConfig(model: modelConfig)
+
+  let myClass = MyClass()
+
+  // We use Unretained here so myClass must be kept alive as the callback is invoked
+  //
+  // See also
+  // https://medium.com/codex/swift-c-callback-interoperability-6d57da6c8ee6
+  let arg = Unmanaged<MyClass>.passUnretained(myClass).toOpaque()
+
+  let callback: TtsCallbackWithArg = { samples, n, arg in
+    let o = Unmanaged<MyClass>.fromOpaque(arg!).takeUnretainedValue()
+    var savedSamples: [Float] = []
+    for index in 0..<n {
+      savedSamples.append(samples![Int(index)])
+    }
+
+    o.playSamples(samples: savedSamples)
+
+    // return 1 so that it continues generating
+    return 1
+  }
+
+  let tts = SherpaOnnxOfflineTtsWrapper(config: &ttsConfig)
+
+  let text =
+    "Friends fell out often because life was changing so fast. The easiest thing in the world was to lose touch with someone."
+  let sid = 0
+  let speed: Float = 1.0
+
+  let audio = tts.generateWithCallbackWithArg(
+    text: text, callback: callback, arg: arg, sid: sid, speed: speed)
+  let filename = "test-kitten-en.wav"
+  let ok = audio.save(filename: filename)
+  if ok == 1 {
+    print("\nSaved to:\(filename)")
+  } else {
+    print("Failed to save to \(filename)")
+  }
+}
+
+@main
+struct App {
+  static func main() {
+    run()
+  }
+}