//go:build darwin
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package engine
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import (
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"fmt"
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"voicesnap/internal/logger"
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"voicesnap/internal/model"
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_ "github.com/k2-fsa/sherpa-onnx-go-macos"
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sherpa "github.com/k2-fsa/sherpa-onnx-go/sherpa_onnx"
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)
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type sherpaEngine struct {
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recognizer *sherpa.OfflineRecognizer
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hwInfo string
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}
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func newPlatformEngine(resolved model.ResolvedModel) (Engine, error) {
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if !isSupportedBackend(resolved.BackendKind) {
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return nil, fmt.Errorf("unsupported backend kind: %s", resolved.BackendKind)
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}
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providers := darwinProviders(resolved.ProviderOrder)
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for _, p := range providers {
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config, err := offlineConfigForResolvedModel(resolved, p.provider)
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if err != nil {
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return nil, err
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}
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recognizer := sherpa.NewOfflineRecognizer(&config)
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if recognizer != nil {
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info := fmt.Sprintf("%s ยท %s", resolved.Profile.DisplayName, p.name)
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logger.Info("Engine initialized: %s", info)
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return &sherpaEngine{
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recognizer: recognizer,
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hwInfo: info,
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}, nil
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}
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logger.Info("Failed to init with %s, trying next provider", p.name)
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}
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return nil, fmt.Errorf("failed to initialize sherpa-onnx with any provider")
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}
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func offlineConfigForResolvedModel(resolved model.ResolvedModel, provider string) (sherpa.OfflineRecognizerConfig, error) {
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config := sherpa.OfflineRecognizerConfig{}
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config.FeatConfig.SampleRate = 16000
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config.FeatConfig.FeatureDim = 80
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config.ModelConfig.Tokens = resolved.Files["tokens"]
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config.ModelConfig.NumThreads = resolved.Profile.NumThreads
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config.ModelConfig.Provider = provider
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config.DecodingMethod = "greedy_search"
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switch resolved.BackendKind {
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case model.BackendSenseVoice:
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config.ModelConfig.SenseVoice.Model = resolved.Files["model"]
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config.ModelConfig.SenseVoice.UseInverseTextNormalization = 1
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case model.BackendMoonshine:
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config.ModelConfig.Moonshine.Preprocessor = resolved.Files["preprocessor"]
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config.ModelConfig.Moonshine.Encoder = resolved.Files["encoder"]
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config.ModelConfig.Moonshine.UncachedDecoder = resolved.Files["uncached_decoder"]
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config.ModelConfig.Moonshine.CachedDecoder = resolved.Files["cached_decoder"]
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case model.BackendNemoTransducer:
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config.ModelConfig.Transducer.Encoder = resolved.Files["encoder"]
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config.ModelConfig.Transducer.Decoder = resolved.Files["decoder"]
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config.ModelConfig.Transducer.Joiner = resolved.Files["joiner"]
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config.ModelConfig.ModelType = model.BackendNemoTransducer
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case model.BackendQwen3ASR:
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config.ModelConfig.Qwen3ASR.ConvFrontend = resolved.Files["conv_frontend"]
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config.ModelConfig.Qwen3ASR.Encoder = resolved.Files["encoder"]
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config.ModelConfig.Qwen3ASR.Decoder = resolved.Files["decoder"]
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config.ModelConfig.Qwen3ASR.Tokenizer = resolved.Files["tokenizer"]
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config.ModelConfig.Qwen3ASR.MaxTotalLen = 1024
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config.ModelConfig.Qwen3ASR.MaxNewTokens = 256
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config.ModelConfig.Qwen3ASR.Temperature = 0.0
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config.ModelConfig.Qwen3ASR.TopP = 0.9
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config.ModelConfig.Qwen3ASR.Seed = 0
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default:
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return sherpa.OfflineRecognizerConfig{}, fmt.Errorf("unsupported backend kind: %s", resolved.BackendKind)
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}
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return config, nil
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}
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func darwinProviders(providerOrder []string) []struct {
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name string
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provider string
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} {
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names := map[string]string{
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"coreml": "CoreML (Apple Neural Engine)",
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"cpu": "CPU",
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}
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providers := make([]struct {
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name string
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provider string
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}, 0, len(providerOrder))
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for _, provider := range providerOrder {
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name, ok := names[provider]
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if !ok {
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continue
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}
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providers = append(providers, struct {
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name string
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provider string
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}{name: name, provider: provider})
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}
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if len(providers) == 0 {
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providers = append(providers, struct {
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name string
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provider string
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}{name: "CPU", provider: "cpu"})
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}
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return providers
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}
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func (e *sherpaEngine) Recognize(samples []float32) (string, error) {
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stream := sherpa.NewOfflineStream(e.recognizer)
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defer sherpa.DeleteOfflineStream(stream)
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stream.AcceptWaveform(16000, samples)
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e.recognizer.Decode(stream)
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result := stream.GetResult()
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return result.Text, nil
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}
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func (e *sherpaEngine) HardwareInfo() string {
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return e.hwInfo
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}
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func (e *sherpaEngine) Close() {
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if e.recognizer != nil {
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sherpa.DeleteOfflineRecognizer(e.recognizer)
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e.recognizer = nil
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}
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}
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