Add Go API for speech enhancement GTCRN models (#1991)

@@ -70,6 +70,13 @@ jobs:
         run: |
           gcc --version
 
+      - name: Test speech enhancement (GTCRN)
+        if: matrix.os != 'windows-latest'
+        shell: bash
+        run: |
+          cd go-api-examples/speech-enhancement-gtcrn/
+          ./run.sh
+
       - name: Test Keyword spotting
         if: matrix.os != 'windows-latest'
         shell: bash

@@ -132,6 +132,15 @@ jobs:
           name: ${{ matrix.os }}-libs
           path: to-upload/
 
+      - name: Test speech enhancement (GTCRN)
+        shell: bash
+        run: |
+          cd scripts/go/_internal/speech-enhancement-gtcrn/
+
+          ./run.sh
+
+          ls -lh
+
       - name: Test audio tagging
         shell: bash
         run: |

+module speech-enhancement-gtcrn
+
+go 1.17
+

+package main
+
+import (
+	sherpa "github.com/k2-fsa/sherpa-onnx-go/sherpa_onnx"
+	"log"
+)
+
+func main() {
+	log.SetFlags(log.LstdFlags | log.Lmicroseconds)
+
+	config := sherpa.OfflineSpeechDenoiserConfig{}
+
+	// Please download the models from
+	// https://github.com/k2-fsa/sherpa-onnx/releases/tag/speech-enhancement-models
+
+	config.Model.Gtcrn.Model = "./gtcrn_simple.onnx"
+	config.Model.NumThreads = 1
+	config.Model.Debug = 1
+
+	sd := sherpa.NewOfflineSpeechDenoiser(&config)
+	defer sherpa.DeleteOfflineSpeechDenoiser(sd)
+
+	wave_filename := "./inp_16k.wav"
+
+	wave := sherpa.ReadWave(wave_filename)
+	if wave == nil {
+		log.Printf("Failed to read %v\n", wave_filename)
+		return
+	}
+
+	log.Println("Started")
+	audio := sd.Run(wave.Samples, wave.SampleRate)
+	log.Println("Done!")
+
+	filename := "./enhanced-16k.wav"
+	ok := audio.Save(filename)
+	if !ok {
+		log.Fatalf("Failed to write", filename)
+	} else {
+		log.Println("Saved to ", filename)
+	}
+
+}

+#!/usr/bin/env bash
+set -ex
+
+if [ ! -f ./gtcrn_simple.onnx ]; then
+  curl -SL -O https://github.com/k2-fsa/sherpa-onnx/releases/download/speech-enhancement-models/gtcrn_simple.onnx
+fi
+
+if [ ! -f ./inp_16k.wav ]; then
+  curl -SL -O https://github.com/k2-fsa/sherpa-onnx/releases/download/speech-enhancement-models/inp_16k.wav
+fi
+
+go mod tidy
+go build
+
+./speech-enhancement-gtcrn

 /// Copyright (c)  2025  Xiaomi Corporation (authors: Fangjun Kuang)
 
+using System;
 using System.Runtime.InteropServices;
 
 namespace SherpaOnnx

+speech-enhancement-gtcrn

+module speech-enhancement-gtcrn
+
+go 1.17
+
+replace github.com/k2-fsa/sherpa-onnx-go/sherpa_onnx => ../

+../../../../go-api-examples/speech-enhancement-gtcrn/main.go
\ No newline at end of file

+../../../../go-api-examples/speech-enhancement-gtcrn/run.sh
\ No newline at end of file

@@ -959,7 +959,6 @@ func (tts *OfflineTts) Generate(text string, sid int, speed float32) *GeneratedA
 	// see https://stackoverflow.com/questions/48756732/what-does-1-30c-yourtype-do-exactly-in-cgo
 	// :n:n means 0:n:n, means low:high:capacity
 	samples := unsafe.Slice(audio.samples, n)
-	// copy(ans.Samples, samples)
 	for i := 0; i < n; i++ {
 		ans.Samples[i] = float32(samples[i])
 	}
@@ -1840,3 +1839,88 @@ func (tagging *AudioTagging) Compute(s *OfflineStream, topK int32) []AudioEvent
 	}
 	return result
 }
+
+type OfflineSpeechDenoiserGtcrnModelConfig struct {
+	Model string
+}
+
+type OfflineSpeechDenoiserModelConfig struct {
+	Gtcrn      OfflineSpeechDenoiserGtcrnModelConfig
+	NumThreads int32
+	Debug      int32
+	Provider   string
+}
+
+type OfflineSpeechDenoiserConfig struct {
+	Model OfflineSpeechDenoiserModelConfig
+}
+
+type OfflineSpeechDenoiser struct {
+	impl *C.struct_SherpaOnnxOfflineSpeechDenoiser
+}
+
+type DenoisedAudio struct {
+	// Normalized samples in the range [-1, 1]
+	Samples []float32
+
+	SampleRate int
+}
+
+// Free the internal pointer inside the OfflineSpeechDenoiser to avoid memory leak.
+func DeleteOfflineSpeechDenoiser(sd *OfflineSpeechDenoiser) {
+	C.SherpaOnnxDestroyOfflineSpeechDenoiser(sd.impl)
+	sd.impl = nil
+}
+
+// The user is responsible to invoke [DeleteOfflineSpeechDenoiser]() to free
+// the returned tts to avoid memory leak
+func NewOfflineSpeechDenoiser(config *OfflineSpeechDenoiserConfig) *OfflineSpeechDenoiser {
+	c := C.struct_SherpaOnnxOfflineSpeechDenoiserConfig{}
+	c.model.gtcrn.model = C.CString(config.Model.Gtcrn.Model)
+	defer C.free(unsafe.Pointer(c.model.gtcrn.model))
+
+	c.model.num_threads = C.int(config.Model.NumThreads)
+	c.model.debug = C.int(config.Model.Debug)
+
+	c.model.provider = C.CString(config.Model.Provider)
+	defer C.free(unsafe.Pointer(c.model.provider))
+
+	impl := C.SherpaOnnxCreateOfflineSpeechDenoiser(&c)
+	if impl == nil {
+		return nil
+	}
+
+	sd := &OfflineSpeechDenoiser{}
+	sd.impl = impl
+	return sd
+}
+
+func (sd *OfflineSpeechDenoiser) Run(samples []float32, sampleRate int) *DenoisedAudio {
+	audio := C.SherpaOnnxOfflineSpeechDenoiserRun(sd.impl, (*C.float)(&samples[0]), C.int(len(samples)), C.int(sampleRate))
+	defer C.SherpaOnnxDestroyDenoisedAudio(audio)
+
+	ans := &DenoisedAudio{}
+	ans.SampleRate = int(audio.sample_rate)
+	n := int(audio.n)
+	ans.Samples = make([]float32, n)
+
+	denoisedSamples := unsafe.Slice(audio.samples, n)
+	for i := 0; i < n; i++ {
+		ans.Samples[i] = float32(denoisedSamples[i])
+	}
+
+	return ans
+}
+
+func (audio *DenoisedAudio) Save(filename string) bool {
+	s := C.CString(filename)
+	defer C.free(unsafe.Pointer(s))
+
+	ok := int(C.SherpaOnnxWriteWave((*C.float)(&audio.Samples[0]), C.int(len(audio.Samples)), C.int(audio.SampleRate), s))
+
+	return ok == 1
+}
+
+func (sd *OfflineSpeechDenoiser) SampleRate() int {
+	return int(C.SherpaOnnxOfflineSpeechDenoiserGetSampleRate(sd.impl))
+}