vad-moonshine-c-api.c
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// c-api-examples/vad-moonshine-c-api.c
//
// Copyright (c) 2024 Xiaomi Corporation
//
// This file demonstrates how to use VAD + Moonshine with sherpa-onnx's C API.
// clang-format off
//
// wget https://github.com/k2-fsa/sherpa-onnx/releases/download/asr-models/silero_vad.onnx
// wget https://github.com/k2-fsa/sherpa-onnx/releases/download/asr-models/Obama.wav
//
// wget https://github.com/k2-fsa/sherpa-onnx/releases/download/asr-models/sherpa-onnx-moonshine-tiny-en-int8.tar.bz2
// tar xvf sherpa-onnx-moonshine-tiny-en-int8.tar.bz2
// rm sherpa-onnx-moonshine-tiny-en-int8.tar.bz2
//
// clang-format on
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "sherpa-onnx/c-api/c-api.h"
int32_t main() {
const char *wav_filename = "./Obama.wav";
const char *vad_filename = "./silero_vad.onnx";
const char *preprocessor =
"./sherpa-onnx-moonshine-tiny-en-int8/preprocess.onnx";
const char *encoder = "./sherpa-onnx-moonshine-tiny-en-int8/encode.int8.onnx";
const char *uncached_decoder =
"./sherpa-onnx-moonshine-tiny-en-int8/uncached_decode.int8.onnx";
const char *cached_decoder =
"./sherpa-onnx-moonshine-tiny-en-int8/cached_decode.int8.onnx";
const char *tokens = "./sherpa-onnx-moonshine-tiny-en-int8/tokens.txt";
const SherpaOnnxWave *wave = SherpaOnnxReadWave(wav_filename);
if (wave == NULL) {
fprintf(stderr, "Failed to read %s\n", wav_filename);
return -1;
}
if (wave->sample_rate != 16000) {
fprintf(stderr, "Expect the sample rate to be 16000. Given: %d\n",
wave->sample_rate);
SherpaOnnxFreeWave(wave);
return -1;
}
// Offline model config
SherpaOnnxOfflineModelConfig offline_model_config;
memset(&offline_model_config, 0, sizeof(offline_model_config));
offline_model_config.debug = 0;
offline_model_config.num_threads = 1;
offline_model_config.provider = "cpu";
offline_model_config.tokens = tokens;
offline_model_config.moonshine.preprocessor = preprocessor;
offline_model_config.moonshine.encoder = encoder;
offline_model_config.moonshine.uncached_decoder = uncached_decoder;
offline_model_config.moonshine.cached_decoder = cached_decoder;
// Recognizer config
SherpaOnnxOfflineRecognizerConfig recognizer_config;
memset(&recognizer_config, 0, sizeof(recognizer_config));
recognizer_config.decoding_method = "greedy_search";
recognizer_config.model_config = offline_model_config;
const SherpaOnnxOfflineRecognizer *recognizer =
SherpaOnnxCreateOfflineRecognizer(&recognizer_config);
if (recognizer == NULL) {
fprintf(stderr, "Please check your recognizer config!\n");
SherpaOnnxFreeWave(wave);
return -1;
}
SherpaOnnxVadModelConfig vadConfig;
memset(&vadConfig, 0, sizeof(vadConfig));
vadConfig.silero_vad.model = vad_filename;
vadConfig.silero_vad.threshold = 0.5;
vadConfig.silero_vad.min_silence_duration = 0.5;
vadConfig.silero_vad.min_speech_duration = 0.5;
vadConfig.silero_vad.max_speech_duration = 10;
vadConfig.silero_vad.window_size = 512;
vadConfig.sample_rate = 16000;
vadConfig.num_threads = 1;
vadConfig.debug = 1;
SherpaOnnxVoiceActivityDetector *vad =
SherpaOnnxCreateVoiceActivityDetector(&vadConfig, 30);
if (vad == NULL) {
fprintf(stderr, "Please check your recognizer config!\n");
SherpaOnnxFreeWave(wave);
SherpaOnnxDestroyOfflineRecognizer(recognizer);
return -1;
}
int32_t window_size = vadConfig.silero_vad.window_size;
int32_t i = 0;
int is_eof = 0;
while (!is_eof) {
if (i + window_size < wave->num_samples) {
SherpaOnnxVoiceActivityDetectorAcceptWaveform(vad, wave->samples + i,
window_size);
} else {
SherpaOnnxVoiceActivityDetectorFlush(vad);
is_eof = 1;
}
while (!SherpaOnnxVoiceActivityDetectorEmpty(vad)) {
const SherpaOnnxSpeechSegment *segment =
SherpaOnnxVoiceActivityDetectorFront(vad);
const SherpaOnnxOfflineStream *stream =
SherpaOnnxCreateOfflineStream(recognizer);
SherpaOnnxAcceptWaveformOffline(stream, wave->sample_rate,
segment->samples, segment->n);
SherpaOnnxDecodeOfflineStream(recognizer, stream);
const SherpaOnnxOfflineRecognizerResult *result =
SherpaOnnxGetOfflineStreamResult(stream);
float start = segment->start / 16000.0f;
float duration = segment->n / 16000.0f;
float stop = start + duration;
fprintf(stderr, "%.3f -- %.3f: %s\n", start, stop, result->text);
SherpaOnnxDestroyOfflineRecognizerResult(result);
SherpaOnnxDestroyOfflineStream(stream);
SherpaOnnxDestroySpeechSegment(segment);
SherpaOnnxVoiceActivityDetectorPop(vad);
}
i += window_size;
}
SherpaOnnxDestroyOfflineRecognizer(recognizer);
SherpaOnnxDestroyVoiceActivityDetector(vad);
SherpaOnnxFreeWave(wave);
return 0;
}