kws-cxx-api.cc
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// cxx-api-examples/kws-cxx-api.cc
//
// Copyright (c) 2025 Xiaomi Corporation
//
// This file demonstrates how to use keywords spotter with sherpa-onnx's C
// clang-format off
//
// Usage
//
// wget https://github.com/k2-fsa/sherpa-onnx/releases/download/kws-models/sherpa-onnx-kws-zipformer-wenetspeech-3.3M-2024-01-01-mobile.tar.bz2
// tar xvf sherpa-onnx-kws-zipformer-wenetspeech-3.3M-2024-01-01-mobile.tar.bz2
// rm sherpa-onnx-kws-zipformer-wenetspeech-3.3M-2024-01-01-mobile.tar.bz2
//
// ./kws-cxx-api
//
// clang-format on
#include <array>
#include <iostream>
#include "sherpa-onnx/c-api/cxx-api.h"
int32_t main() {
using namespace sherpa_onnx::cxx; // NOLINT
KeywordSpotterConfig config;
config.model_config.transducer.encoder =
"./sherpa-onnx-kws-zipformer-wenetspeech-3.3M-2024-01-01/"
"encoder-epoch-12-avg-2-chunk-16-left-64.onnx";
config.model_config.transducer.decoder =
"./sherpa-onnx-kws-zipformer-wenetspeech-3.3M-2024-01-01/"
"decoder-epoch-12-avg-2-chunk-16-left-64.onnx";
config.model_config.transducer.joiner =
"./sherpa-onnx-kws-zipformer-wenetspeech-3.3M-2024-01-01/"
"joiner-epoch-12-avg-2-chunk-16-left-64.onnx";
config.model_config.tokens =
"./sherpa-onnx-kws-zipformer-wenetspeech-3.3M-2024-01-01/tokens.txt";
config.model_config.provider = "cpu";
config.model_config.num_threads = 1;
config.model_config.debug = 1;
config.keywords_file =
"./sherpa-onnx-kws-zipformer-wenetspeech-3.3M-2024-01-01/test_wavs/"
"test_keywords.txt";
KeywordSpotter kws = KeywordSpotter::Create(config);
if (!kws.Get()) {
std::cerr << "Please check your config\n";
return -1;
}
std::cout
<< "--Test pre-defined keywords from test_wavs/test_keywords.txt--\n";
std::string wave_filename =
"./sherpa-onnx-kws-zipformer-wenetspeech-3.3M-2024-01-01/test_wavs/3.wav";
std::array<float, 8000> tail_paddings = {0}; // 0.5 seconds
Wave wave = ReadWave(wave_filename);
if (wave.samples.empty()) {
std::cerr << "Failed to read: '" << wave_filename << "'\n";
return -1;
}
OnlineStream stream = kws.CreateStream();
if (!stream.Get()) {
std::cerr << "Failed to create stream\n";
return -1;
}
stream.AcceptWaveform(wave.sample_rate, wave.samples.data(),
wave.samples.size());
stream.AcceptWaveform(wave.sample_rate, tail_paddings.data(),
tail_paddings.size());
stream.InputFinished();
while (kws.IsReady(&stream)) {
kws.Decode(&stream);
auto r = kws.GetResult(&stream);
if (!r.keyword.empty()) {
std::cout << "Detected keyword: " << r.json << "\n";
// Remember to reset the keyword stream right after a keyword is detected
kws.Reset(&stream);
}
}
// --------------------------------------------------------------------------
std::cout << "--Use pre-defined keywords + add a new keyword--\n";
stream = kws.CreateStream("y ǎn y uán @演员");
stream.AcceptWaveform(wave.sample_rate, wave.samples.data(),
wave.samples.size());
stream.AcceptWaveform(wave.sample_rate, tail_paddings.data(),
tail_paddings.size());
stream.InputFinished();
while (kws.IsReady(&stream)) {
kws.Decode(&stream);
auto r = kws.GetResult(&stream);
if (!r.keyword.empty()) {
std::cout << "Detected keyword: " << r.json << "\n";
// Remember to reset the keyword stream right after a keyword is detected
kws.Reset(&stream);
}
}
// --------------------------------------------------------------------------
std::cout << "--Use pre-defined keywords + add two new keywords--\n";
stream = kws.CreateStream("y ǎn y uán @演员/zh ī m íng @知名");
stream.AcceptWaveform(wave.sample_rate, wave.samples.data(),
wave.samples.size());
stream.AcceptWaveform(wave.sample_rate, tail_paddings.data(),
tail_paddings.size());
stream.InputFinished();
while (kws.IsReady(&stream)) {
kws.Decode(&stream);
auto r = kws.GetResult(&stream);
if (!r.keyword.empty()) {
std::cout << "Detected keyword: " << r.json << "\n";
// Remember to reset the keyword stream right after a keyword is detected
kws.Reset(&stream);
}
}
return 0;
}