kws-c-api.c
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// c-api-examples/kws-c-api.c
//
// 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-c-api
//
// clang-format on
#include <stdio.h>
#include <stdlib.h> // exit
#include <string.h> // memset
#include "sherpa-onnx/c-api/c-api.h"
int32_t main() {
SherpaOnnxKeywordSpotterConfig config;
memset(&config, 0, sizeof(config));
config.model_config.transducer.encoder =
"./sherpa-onnx-kws-zipformer-wenetspeech-3.3M-2024-01-01-mobile/"
"encoder-epoch-12-avg-2-chunk-16-left-64.int8.onnx";
config.model_config.transducer.decoder =
"./sherpa-onnx-kws-zipformer-wenetspeech-3.3M-2024-01-01-mobile/"
"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-mobile/"
"joiner-epoch-12-avg-2-chunk-16-left-64.int8.onnx";
config.model_config.tokens =
"./sherpa-onnx-kws-zipformer-wenetspeech-3.3M-2024-01-01-mobile/"
"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-mobile/"
"test_wavs/test_keywords.txt";
const SherpaOnnxKeywordSpotter *kws = SherpaOnnxCreateKeywordSpotter(&config);
if (!kws) {
fprintf(stderr, "Please check your config");
exit(-1);
}
fprintf(stderr,
"--Test pre-defined keywords from test_wavs/test_keywords.txt--\n");
const char *wav_filename =
"./sherpa-onnx-kws-zipformer-wenetspeech-3.3M-2024-01-01-mobile/"
"test_wavs/3.wav";
float tail_paddings[8000] = {0}; // 0.5 seconds
const SherpaOnnxWave *wave = SherpaOnnxReadWave(wav_filename);
if (wave == NULL) {
fprintf(stderr, "Failed to read %s\n", wav_filename);
exit(-1);
}
const SherpaOnnxOnlineStream *stream = SherpaOnnxCreateKeywordStream(kws);
if (!stream) {
fprintf(stderr, "Failed to create stream\n");
exit(-1);
}
SherpaOnnxOnlineStreamAcceptWaveform(stream, wave->sample_rate, wave->samples,
wave->num_samples);
SherpaOnnxOnlineStreamAcceptWaveform(stream, wave->sample_rate, tail_paddings,
sizeof(tail_paddings) / sizeof(float));
SherpaOnnxOnlineStreamInputFinished(stream);
while (SherpaOnnxIsKeywordStreamReady(kws, stream)) {
SherpaOnnxDecodeKeywordStream(kws, stream);
const SherpaOnnxKeywordResult *r = SherpaOnnxGetKeywordResult(kws, stream);
if (r && r->json && strlen(r->keyword)) {
fprintf(stderr, "Detected keyword: %s\n", r->json);
// Remember to reset the keyword stream right after a keyword is detected
SherpaOnnxResetKeywordStream(kws, stream);
}
SherpaOnnxDestroyKeywordResult(r);
}
SherpaOnnxDestroyOnlineStream(stream);
// --------------------------------------------------------------------------
fprintf(stderr, "--Use pre-defined keywords + add a new keyword--\n");
stream = SherpaOnnxCreateKeywordStreamWithKeywords(kws, "y ǎn y uán @演员");
SherpaOnnxOnlineStreamAcceptWaveform(stream, wave->sample_rate, wave->samples,
wave->num_samples);
SherpaOnnxOnlineStreamAcceptWaveform(stream, wave->sample_rate, tail_paddings,
sizeof(tail_paddings) / sizeof(float));
SherpaOnnxOnlineStreamInputFinished(stream);
while (SherpaOnnxIsKeywordStreamReady(kws, stream)) {
SherpaOnnxDecodeKeywordStream(kws, stream);
const SherpaOnnxKeywordResult *r = SherpaOnnxGetKeywordResult(kws, stream);
if (r && r->json && strlen(r->keyword)) {
fprintf(stderr, "Detected keyword: %s\n", r->json);
// Remember to reset the keyword stream
SherpaOnnxResetKeywordStream(kws, stream);
}
SherpaOnnxDestroyKeywordResult(r);
}
SherpaOnnxDestroyOnlineStream(stream);
// --------------------------------------------------------------------------
fprintf(stderr, "--Use pre-defined keywords + add two new keywords--\n");
stream = SherpaOnnxCreateKeywordStreamWithKeywords(
kws, "y ǎn y uán @演员/zh ī m íng @知名");
SherpaOnnxOnlineStreamAcceptWaveform(stream, wave->sample_rate, wave->samples,
wave->num_samples);
SherpaOnnxOnlineStreamAcceptWaveform(stream, wave->sample_rate, tail_paddings,
sizeof(tail_paddings) / sizeof(float));
SherpaOnnxOnlineStreamInputFinished(stream);
while (SherpaOnnxIsKeywordStreamReady(kws, stream)) {
SherpaOnnxDecodeKeywordStream(kws, stream);
const SherpaOnnxKeywordResult *r = SherpaOnnxGetKeywordResult(kws, stream);
if (r && r->json && strlen(r->keyword)) {
fprintf(stderr, "Detected keyword: %s\n", r->json);
// Remember to reset the keyword stream
SherpaOnnxResetKeywordStream(kws, stream);
}
SherpaOnnxDestroyKeywordResult(r);
}
SherpaOnnxDestroyOnlineStream(stream);
SherpaOnnxFreeWave(wave);
SherpaOnnxDestroyKeywordSpotter(kws);
return 0;
}