Add VAD examples using ALSA for recording (#739)

@@ -58,7 +58,6 @@ rm sherpa-onnx-streaming-zipformer-ctc-multi-zh-hans-2023-12-13.tar.bz2
 node ./test-online-zipformer2-ctc.js
 rm -rf sherpa-onnx-streaming-zipformer-ctc-multi-zh-hans-2023-12-13
 
-
 curl -LS -O https://github.com/k2-fsa/sherpa-onnx/releases/download/asr-models/sherpa-onnx-streaming-zipformer-ctc-small-2024-03-18.tar.bz2
 tar xvf sherpa-onnx-streaming-zipformer-ctc-small-2024-03-18.tar.bz2
 rm sherpa-onnx-streaming-zipformer-ctc-small-2024-03-18.tar.bz2
@@ -70,9 +69,9 @@ rm -rf sherpa-onnx-streaming-zipformer-ctc-small-2024-03-18
 curl -LS -O https://github.com/k2-fsa/sherpa-onnx/releases/download/tts-models/vits-piper-en_US-amy-low.tar.bz2
 tar xf vits-piper-en_US-amy-low.tar.bz2
 node ./test-offline-tts-en.js
-rm vits-piper-en_US-amy-low*
+rm -rf vits-piper-en_US-amy-low*
 
 curl -LS -O https://github.com/k2-fsa/sherpa-onnx/releases/download/tts-models/vits-icefall-zh-aishell3.tar.bz2
 tar xvf vits-icefall-zh-aishell3.tar.bz2
 node ./test-offline-tts-zh.js
-rm vits-icefall-zh-aishell3*
+rm -rf vits-icefall-zh-aishell3*

@@ -59,8 +59,27 @@ jobs:
         run: |
           ls -lh ./wheelhouse/
 
+      - name: Install patchelf
+        if: matrix.os == 'ubuntu-latest'
+        shell: bash
+        run: |
+          sudo apt-get update -q
+          sudo apt-get install -q -y patchelf
+          patchelf --help
+
+      - name: Patch wheels
+        shell: bash
+        if: matrix.os == 'ubuntu-latest'
+        run: |
+          mkdir ./wheels
+          sudo ./scripts/wheel/patch_wheel.py --in-dir ./wheelhouse --out-dir ./wheels
+
+          ls -lh ./wheels/
+          rm -rf ./wheelhouse
+          mv ./wheels ./wheelhouse
+
       - name: Publish to huggingface
-        if: matrix.python-version == 'cp38' && matrix.manylinux == 'manylinux2014'
+        if: (matrix.python-version == 'cp38' || matrix.python-version == 'cp39' ) && matrix.manylinux == 'manylinux2014'
         env:
           HF_TOKEN: ${{ secrets.HF_TOKEN }}
         uses: nick-fields/retry@v3

@@ -186,7 +186,7 @@ class MainActivity : AppCompatActivity() {
         // https://github.com/k2-fsa/sherpa-onnx/releases/download/tts-models/vits-icefall-zh-aishell3.tar.bz2
         // modelDir = "vits-icefall-zh-aishell3"
         // modelName = "model.onnx"
-        // ruleFsts = "vits-icefall-zh-aishell3/phone.fst,vits-icefall-zh-aishell3/date.fst,vits-icefall-zh-aishell3/number.fst,"
+        // ruleFsts = "vits-icefall-zh-aishell3/phone.fst,vits-icefall-zh-aishell3/date.fst,vits-icefall-zh-aishell3/number.fst,vits-icefall-zh-aishell3/new_heteronym.fst"
         // ruleFars = "vits-icefall-zh-aishell3/rule.far"
         // lexicon = "lexicon.txt"
 

@@ -67,6 +67,7 @@ def get_binaries():
             "sherpa-onnx-alsa-offline",
             "sherpa-onnx-alsa-offline-speaker-identification",
             "sherpa-onnx-offline-tts-play-alsa",
+            "sherpa-onnx-vad-alsa",
         ]
 
     if is_windows():

@@ -75,6 +75,10 @@ function(download_openfst)
   set_target_properties(fst PROPERTIES OUTPUT_NAME "sherpa-onnx-fst")
   set_target_properties(fstfar PROPERTIES OUTPUT_NAME "sherpa-onnx-fstfar")
 
+  if(LINUX)
+    target_compile_options(fst PUBLIC -Wno-missing-template-keyword)
+  endif()
+
   target_include_directories(fst
     PUBLIC
       ${openfst_SOURCE_DIR}/src/include

+#!/usr/bin/env python3
+
+"""
+This script works only on Linux. It uses ALSA for recording.
+"""
+
+import argparse
+from pathlib import Path
+
+import sherpa_onnx
+
+
+def get_args():
+    parser = argparse.ArgumentParser(
+        formatter_class=argparse.ArgumentDefaultsHelpFormatter
+    )
+
+    parser.add_argument(
+        "--silero-vad-model",
+        type=str,
+        required=True,
+        help="Path to silero_vad.onnx",
+    )
+
+    parser.add_argument(
+        "--device-name",
+        type=str,
+        required=True,
+        help="""
+The device name specifies which microphone to use in case there are several
+on your system. You can use
+
+  arecord -l
+
+to find all available microphones on your computer. For instance, if it outputs
+
+**** List of CAPTURE Hardware Devices ****
+card 3: UACDemoV10 [UACDemoV1.0], device 0: USB Audio [USB Audio]
+  Subdevices: 1/1
+  Subdevice #0: subdevice #0
+
+and if you want to select card 3 and the device 0 on that card, please use:
+
+  plughw:3,0
+
+as the device_name.
+        """,
+    )
+
+    return parser.parse_args()
+
+
+def main():
+    args = get_args()
+    if not Path(args.silero_vad_model).is_file():
+        raise RuntimeError(
+            f"{args.silero_vad_model} does not exist. Please download it from "
+            "https://github.com/snakers4/silero-vad/blob/master/files/silero_vad.onnx"
+        )
+
+    device_name = args.device_name
+    print(f"device_name: {device_name}")
+    alsa = sherpa_onnx.Alsa(device_name)
+
+    sample_rate = 16000
+    samples_per_read = int(0.1 * sample_rate)  # 0.1 second = 100 ms
+
+    config = sherpa_onnx.VadModelConfig()
+    config.silero_vad.model = args.silero_vad_model
+    config.sample_rate = sample_rate
+
+    vad = sherpa_onnx.VoiceActivityDetector(config, buffer_size_in_seconds=30)
+
+    print("Started! Please speak. Press Ctrl C to exit")
+
+    printed = False
+    k = 0
+    try:
+        while True:
+            samples = alsa.read(samples_per_read)  # a blocking read
+
+            vad.accept_waveform(samples)
+
+            if vad.is_speech_detected() and not printed:
+                print("Detected speech")
+                printed = True
+
+            if not vad.is_speech_detected():
+                printed = False
+
+            while not vad.empty():
+                samples = vad.front.samples
+                duration = len(samples) / sample_rate
+                filename = f"seg-{k}-{duration:.3f}-seconds.wav"
+                k += 1
+                sherpa_onnx.write_wave(filename, samples, sample_rate)
+                print(f"Duration: {duration:.3f} seconds")
+                print(f"Saved to {filename}")
+                print("----------")
+
+                vad.pop()
+    except KeyboardInterrupt:
+        print("\nCaught Ctrl + C. Exit")
+
+
+if __name__ == "__main__":
+    main()

+#!/usr/bin/env python3
+
+import argparse
+import os
+import sys
+from pathlib import Path
+
+try:
+    import sounddevice as sd
+except ImportError:
+    print("Please install sounddevice first. You can use")
+    print()
+    print("  pip install sounddevice")
+    print()
+    print("to install it")
+    sys.exit(-1)
+
+import sherpa_onnx
+
+
+def get_args():
+    parser = argparse.ArgumentParser(
+        formatter_class=argparse.ArgumentDefaultsHelpFormatter
+    )
+
+    parser.add_argument(
+        "--silero-vad-model",
+        type=str,
+        required=True,
+        help="Path to silero_vad.onnx",
+    )
+
+    return parser.parse_args()
+
+
+def main():
+    args = get_args()
+    if not Path(args.silero_vad_model).is_file():
+        raise RuntimeError(
+            f"{args.silero_vad_model} does not exist. Please download it from "
+            "https://github.com/snakers4/silero-vad/blob/master/files/silero_vad.onnx"
+        )
+
+    mic_sample_rate = 16000
+    if "SHERPA_ONNX_MIC_SAMPLE_RATE" in os.environ:
+        mic_sample_rate = int(os.environ.get("SHERPA_ONNX_MIC_SAMPLE_RATE"))
+        print(f"Change microphone sample rate to {mic_sample_rate}")
+
+    sample_rate = 16000
+    samples_per_read = int(0.1 * sample_rate)  # 0.1 second = 100 ms
+
+    config = sherpa_onnx.VadModelConfig()
+    config.silero_vad.model = args.silero_vad_model
+    config.sample_rate = sample_rate
+
+    vad = sherpa_onnx.VoiceActivityDetector(config, buffer_size_in_seconds=30)
+
+    # python3 -m sounddevice
+    # can also be used to list all devices
+
+    devices = sd.query_devices()
+    if len(devices) == 0:
+        print("No microphone devices found")
+        print(
+            "If you are using Linux and you are sure there is a microphone "
+            "on your system, please use "
+            "./vad-alsa.py"
+        )
+        sys.exit(0)
+
+    print(devices)
+
+    if "SHERPA_ONNX_MIC_DEVICE" in os.environ:
+        input_device_idx = int(os.environ.get("SHERPA_ONNX_MIC_DEVICE"))
+        sd.default.device[0] = input_device_idx
+        print(f'Use selected device: {devices[input_device_idx]["name"]}')
+    else:
+        input_device_idx = sd.default.device[0]
+        print(f'Use default device: {devices[input_device_idx]["name"]}')
+
+    print("Started! Please speak. Press Ctrl C to exit")
+
+    printed = False
+    k = 0
+    try:
+        with sd.InputStream(
+            channels=1, dtype="float32", samplerate=mic_sample_rate
+        ) as s:
+            while True:
+                samples, _ = s.read(samples_per_read)  # a blocking read
+                samples = samples.reshape(-1)
+
+                if mic_sample_rate != sample_rate:
+                    import librosa
+
+                    samples = librosa.resample(
+                        samples, orig_sr=mic_sample_rate, target_sr=sample_rate
+                    )
+
+                vad.accept_waveform(samples)
+
+                if vad.is_speech_detected() and not printed:
+                    print("Detected speech")
+                    printed = True
+
+                if not vad.is_speech_detected():
+                    printed = False
+
+                while not vad.empty():
+                    samples = vad.front.samples
+                    duration = len(samples) / sample_rate
+                    filename = f"seg-{k}-{duration:.3f}-seconds.wav"
+                    k += 1
+                    sherpa_onnx.write_wave(filename, samples, sample_rate)
+                    print(f"Duration: {duration:.3f} seconds")
+                    print(f"Saved to {filename}")
+                    print("----------")
+
+                    vad.pop()
+    except KeyboardInterrupt:
+        print("\nCaught Ctrl + C. Exit")
+
+
+if __name__ == "__main__":
+    main()

+#!/usr/bin/env python3
+
+"""
+This file shows how to remove non-speech segments
+and merge all speech segments into a large segment
+and save it to a file.
+
+Different from ./vad-remove-non-speech-segments.py, this file supports only
+Linux.
+
+Usage
+
+python3 ./vad-remove-non-speech-segments-alsa.py \
+        --silero-vad-model silero_vad.onnx
+
+Please visit
+https://github.com/snakers4/silero-vad/blob/master/files/silero_vad.onnx
+to download silero_vad.onnx
+
+For instance,
+
+wget https://github.com/snakers4/silero-vad/raw/master/files/silero_vad.onnx
+"""
+
+import argparse
+import time
+from pathlib import Path
+
+import numpy as np
+import sherpa_onnx
+import soundfile as sf
+
+
+def assert_file_exists(filename: str):
+    assert Path(filename).is_file(), (
+        f"{filename} does not exist!\n"
+        "Please refer to "
+        "https://k2-fsa.github.io/sherpa/onnx/pretrained_models/index.html to download it"
+    )
+
+
+def get_args():
+    parser = argparse.ArgumentParser(
+        formatter_class=argparse.ArgumentDefaultsHelpFormatter
+    )
+
+    parser.add_argument(
+        "--silero-vad-model",
+        type=str,
+        required=True,
+        help="Path to silero_vad.onnx",
+    )
+
+    parser.add_argument(
+        "--device-name",
+        type=str,
+        required=True,
+        help="""
+The device name specifies which microphone to use in case there are several
+on your system. You can use
+
+  arecord -l
+
+to find all available microphones on your computer. For instance, if it outputs
+
+**** List of CAPTURE Hardware Devices ****
+card 3: UACDemoV10 [UACDemoV1.0], device 0: USB Audio [USB Audio]
+  Subdevices: 1/1
+  Subdevice #0: subdevice #0
+
+and if you want to select card 3 and the device 0 on that card, please use:
+
+  plughw:3,0
+
+as the device_name.
+        """,
+    )
+
+    return parser.parse_args()
+
+
+def main():
+    args = get_args()
+    assert_file_exists(args.silero_vad_model)
+
+    device_name = args.device_name
+    print(f"device_name: {device_name}")
+    alsa = sherpa_onnx.Alsa(device_name)
+
+    sample_rate = 16000
+    samples_per_read = int(0.1 * sample_rate)  # 0.1 second = 100 ms
+
+    config = sherpa_onnx.VadModelConfig()
+    config.silero_vad.model = args.silero_vad_model
+    config.sample_rate = sample_rate
+
+    window_size = config.silero_vad.window_size
+
+    buffer = []
+    vad = sherpa_onnx.VoiceActivityDetector(config, buffer_size_in_seconds=30)
+
+    all_samples = []
+
+    print("Started! Please speak. Press Ctrl C to exit")
+
+    try:
+        while True:
+            samples = alsa.read(samples_per_read)  # a blocking read
+            samples = np.array(samples)
+
+            buffer = np.concatenate([buffer, samples])
+
+            all_samples = np.concatenate([all_samples, samples])
+
+            while len(buffer) > window_size:
+                vad.accept_waveform(buffer[:window_size])
+                buffer = buffer[window_size:]
+    except KeyboardInterrupt:
+        print("\nCaught Ctrl + C. Saving & Exiting")
+
+        speech_samples = []
+        while not vad.empty():
+            speech_samples.extend(vad.front.samples)
+            vad.pop()
+
+        speech_samples = np.array(speech_samples, dtype=np.float32)
+
+        filename_for_speech = time.strftime("%Y%m%d-%H%M%S-speech.wav")
+        sf.write(filename_for_speech, speech_samples, samplerate=sample_rate)
+
+        filename_for_all = time.strftime("%Y%m%d-%H%M%S-all.wav")
+        sf.write(filename_for_all, all_samples, samplerate=sample_rate)
+
+        print(f"Saved to {filename_for_speech} and {filename_for_all}")
+
+
+if __name__ == "__main__":
+    main()

@@ -66,6 +66,11 @@ def main():
     devices = sd.query_devices()
     if len(devices) == 0:
         print("No microphone devices found")
+        print(
+            "If you are using Linux and you are sure there is a microphone "
+            "on your system, please use "
+            "./vad-remove-non-speech-segments-alsa.py"
+        )
         sys.exit(0)
 
     print(devices)
@@ -89,7 +94,7 @@ def main():
 
     all_samples = []
 
-    print("Started! Please speak")
+    print("Started! Please speak. Press Ctrl C to exit")
 
     try:
         with sd.InputStream(channels=1, dtype="float32", samplerate=sample_rate) as s:

@@ -251,6 +251,7 @@ if(SHERPA_ONNX_HAS_ALSA AND SHERPA_ONNX_ENABLE_BINARY)
   add_executable(sherpa-onnx-keyword-spotter-alsa sherpa-onnx-keyword-spotter-alsa.cc alsa.cc)
   add_executable(sherpa-onnx-alsa-offline sherpa-onnx-alsa-offline.cc alsa.cc)
   add_executable(sherpa-onnx-alsa-offline-speaker-identification sherpa-onnx-alsa-offline-speaker-identification.cc alsa.cc)
+  add_executable(sherpa-onnx-vad-alsa sherpa-onnx-vad-alsa.cc alsa.cc)
 
 
   if(SHERPA_ONNX_ENABLE_TTS)
@@ -259,9 +260,10 @@ if(SHERPA_ONNX_HAS_ALSA AND SHERPA_ONNX_ENABLE_BINARY)
 
   set(exes
     sherpa-onnx-alsa
-    sherpa-onnx-keyword-spotter-alsa
     sherpa-onnx-alsa-offline
     sherpa-onnx-alsa-offline-speaker-identification
+    sherpa-onnx-keyword-spotter-alsa
+    sherpa-onnx-vad-alsa
   )
 
   if(SHERPA_ONNX_ENABLE_TTS)

+// sherpa-onnx/csrc/sherpa-onnx-vad-alsa.cc
+//
+// Copyright (c)  2024  Xiaomi Corporation
+
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <algorithm>
+
+#include "sherpa-onnx/csrc/alsa.h"
+#include "sherpa-onnx/csrc/circular-buffer.h"
+#include "sherpa-onnx/csrc/voice-activity-detector.h"
+#include "sherpa-onnx/csrc/wave-writer.h"
+
+bool stop = false;
+static void Handler(int32_t sig) {
+  stop = true;
+  fprintf(stderr, "\nCaught Ctrl + C. Exiting...\n");
+}
+
+int32_t main(int32_t argc, char *argv[]) {
+  signal(SIGINT, Handler);
+
+  const char *kUsageMessage = R"usage(
+This program shows how to use VAD in sherpa-onnx.
+
+  ./bin/sherpa-onnx-vad-alsa \
+    --silero-vad-model=/path/to/silero_vad.onnx \
+    device_name
+
+Please download silero_vad.onnx from
+https://github.com/snakers4/silero-vad/blob/master/files/silero_vad.onnx
+
+For instance, use
+wget https://github.com/snakers4/silero-vad/raw/master/files/silero_vad.onnx
+
+The device name specifies which microphone to use in case there are several
+on your system. You can use
+
+  arecord -l
+
+to find all available microphones on your computer. For instance, if it outputs
+
+**** List of CAPTURE Hardware Devices ****
+card 3: UACDemoV10 [UACDemoV1.0], device 0: USB Audio [USB Audio]
+  Subdevices: 1/1
+  Subdevice #0: subdevice #0
+
+and if you want to select card 3 and the device 0 on that card, please use:
+
+  plughw:3,0
+
+as the device_name.
+)usage";
+
+  sherpa_onnx::ParseOptions po(kUsageMessage);
+  sherpa_onnx::VadModelConfig config;
+
+  config.Register(&po);
+  po.Read(argc, argv);
+  if (po.NumArgs() != 1) {
+    fprintf(stderr, "Please provide only 1 argument: the device name\n");
+    po.PrintUsage();
+    exit(EXIT_FAILURE);
+  }
+
+  fprintf(stderr, "%s\n", config.ToString().c_str());
+
+  if (!config.Validate()) {
+    fprintf(stderr, "Errors in config!\n");
+    return -1;
+  }
+
+  std::string device_name = po.GetArg(1);
+  sherpa_onnx::Alsa alsa(device_name.c_str());
+  fprintf(stderr, "Use recording device: %s\n", device_name.c_str());
+
+  int32_t sample_rate = 16000;
+
+  if (alsa.GetExpectedSampleRate() != sample_rate) {
+    fprintf(stderr, "sample rate: %d != %d\n", alsa.GetExpectedSampleRate(),
+            sample_rate);
+    exit(-1);
+  }
+
+  int32_t chunk = 0.1 * alsa.GetActualSampleRate();
+
+  auto vad = std::make_unique<sherpa_onnx::VoiceActivityDetector>(config);
+
+  fprintf(stderr, "Started. Please speak\n");
+
+  int32_t window_size = config.silero_vad.window_size;
+  bool printed = false;
+
+  int32_t k = 0;
+  while (!stop) {
+    {
+      const std::vector<float> &samples = alsa.Read(chunk);
+
+      vad->AcceptWaveform(samples.data(), samples.size());
+
+      if (vad->IsSpeechDetected() && !printed) {
+        printed = true;
+        fprintf(stderr, "\nDetected speech!\n");
+      }
+      if (!vad->IsSpeechDetected()) {
+        printed = false;
+      }
+
+      while (!vad->Empty()) {
+        const auto &segment = vad->Front();
+        float duration =
+            segment.samples.size() / static_cast<float>(sample_rate);
+
+        fprintf(stderr, "Duration: %.3f seconds\n", duration);
+
+        char filename[128];
+        snprintf(filename, sizeof(filename), "seg-%d-%.3fs.wav", k, duration);
+        k += 1;
+        sherpa_onnx::WriteWave(filename, 16000, segment.samples.data(),
+                               segment.samples.size());
+        fprintf(stderr, "Saved to %s\n", filename);
+        fprintf(stderr, "----------\n");
+
+        vad->Pop();
+      }
+    }
+  }
+
+  return 0;
+}

@@ -13,6 +13,7 @@
 #include "sherpa-onnx/csrc/circular-buffer.h"
 #include "sherpa-onnx/csrc/microphone.h"
 #include "sherpa-onnx/csrc/voice-activity-detector.h"
+#include "sherpa-onnx/csrc/wave-writer.h"
 
 bool stop = false;
 std::mutex mutex;
@@ -122,6 +123,7 @@ wget https://github.com/snakers4/silero-vad/raw/master/files/silero_vad.onnx
   int32_t window_size = config.silero_vad.window_size;
   bool printed = false;
 
+  int32_t k = 0;
   while (!stop) {
     {
       std::lock_guard<std::mutex> lock(mutex);
@@ -140,9 +142,19 @@ wget https://github.com/snakers4/silero-vad/raw/master/files/silero_vad.onnx
         }
 
         while (!vad->Empty()) {
-          float duration = vad->Front().samples.size() / sample_rate;
-          vad->Pop();
+          const auto &segment = vad->Front();
+          float duration = segment.samples.size() / sample_rate;
           fprintf(stderr, "Duration: %.3f seconds\n", duration);
+
+          char filename[128];
+          snprintf(filename, sizeof(filename), "seg-%d-%.3fs.wav", k, duration);
+          k += 1;
+          sherpa_onnx::WriteWave(filename, 16000, segment.samples.data(),
+                                 segment.samples.size());
+          fprintf(stderr, "Saved to %s\n", filename);
+          fprintf(stderr, "----------\n");
+
+          vad->Pop();
         }
       }
     }

@@ -35,6 +35,7 @@ set(srcs
   vad-model-config.cc
   vad-model.cc
   voice-activity-detector.cc
+  wave-writer.cc
 )
 if(SHERPA_ONNX_HAS_ALSA)
   list(APPEND srcs ${CMAKE_SOURCE_DIR}/sherpa-onnx/csrc/alsa.cc alsa.cc)

@@ -26,6 +26,7 @@
 #include "sherpa-onnx/python/csrc/vad-model-config.h"
 #include "sherpa-onnx/python/csrc/vad-model.h"
 #include "sherpa-onnx/python/csrc/voice-activity-detector.h"
+#include "sherpa-onnx/python/csrc/wave-writer.h"
 
 #if SHERPA_ONNX_ENABLE_TTS == 1
 #include "sherpa-onnx/python/csrc/offline-tts.h"
@@ -36,6 +37,8 @@ namespace sherpa_onnx {
 PYBIND11_MODULE(_sherpa_onnx, m) {
   m.doc() = "pybind11 binding of sherpa-onnx";
 
+  PybindWaveWriter(&m);
+
   PybindFeatures(&m);
   PybindOnlineCtcFstDecoderConfig(&m);
   PybindOnlineModelConfig(&m);

+// sherpa-onnx/python/csrc/wave-writer.cc
+//
+// Copyright (c)  2024  Xiaomi Corporation
+
+#include "sherpa-onnx/python/csrc/wave-writer.h"
+
+#include <string>
+#include <vector>
+
+#include "sherpa-onnx/csrc/wave-writer.h"
+
+namespace sherpa_onnx {
+
+void PybindWaveWriter(py::module *m) {
+  m->def(
+      "write_wave",
+      [](const std::string &filename, const std::vector<float> &samples,
+         int32_t sample_rate) -> bool {
+        bool ok =
+            WriteWave(filename, sample_rate, samples.data(), samples.size());
+
+        return ok;
+      },
+      py::arg("filename"), py::arg("samples"), py::arg("sample_rate"));
+}
+
+}  // namespace sherpa_onnx

+// sherpa-onnx/python/csrc/wave-writer.h
+//
+// Copyright (c)  2024  Xiaomi Corporation
+
+#ifndef SHERPA_ONNX_PYTHON_CSRC_WAVE_WRITER_H_
+#define SHERPA_ONNX_PYTHON_CSRC_WAVE_WRITER_H_
+
+#include "sherpa-onnx/python/csrc/sherpa-onnx.h"
+
+namespace sherpa_onnx {
+
+void PybindWaveWriter(py::module *m);
+
+}
+
+#endif  // SHERPA_ONNX_PYTHON_CSRC_WAVE_WRITER_H_

@@ -19,6 +19,7 @@ from _sherpa_onnx import (
     VadModel,
     VadModelConfig,
     VoiceActivityDetector,
+    write_wave,
 )
 
 from .keyword_spotter import KeywordSpotter