nemo-parakeet-c-api.c
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// c-api-examples/nemo-parakeet-c-api.c
// Example using the C API and sherpa-onnx-nemo-parakeet-tdt-0.6b-v3-int8 model
// Prints recognized text, per-token timestamps, and durations
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "sherpa-onnx/c-api/c-api.h"
int32_t main() {
const char *wav_filename =
"./sherpa-onnx-nemo-parakeet-tdt-0.6b-v3-int8/test_wavs/en.wav";
const char *encoder_filename =
"sherpa-onnx-nemo-parakeet-tdt-0.6b-v3-int8/encoder.int8.onnx";
const char *decoder_filename =
"sherpa-onnx-nemo-parakeet-tdt-0.6b-v3-int8/decoder.int8.onnx";
const char *joiner_filename =
"sherpa-onnx-nemo-parakeet-tdt-0.6b-v3-int8/joiner.int8.onnx";
const char *tokens_filename =
"sherpa-onnx-nemo-parakeet-tdt-0.6b-v3-int8/tokens.txt";
const char *provider = "cpu";
if (!SherpaOnnxFileExists(wav_filename)) {
fprintf(stderr, "File not found: %s\n", wav_filename);
return -1;
}
const SherpaOnnxWave *wave = SherpaOnnxReadWave(wav_filename);
if (wave == NULL) {
fprintf(stderr, "Failed to read or parse %s (not a valid mono 16-bit WAVE file)\n", wav_filename);
return -1;
}
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 = provider;
offline_model_config.tokens = tokens_filename;
offline_model_config.transducer.encoder = encoder_filename;
offline_model_config.transducer.decoder = decoder_filename;
offline_model_config.transducer.joiner = joiner_filename;
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 config!\n");
SherpaOnnxFreeWave(wave);
return -1;
}
const SherpaOnnxOfflineStream *stream =
SherpaOnnxCreateOfflineStream(recognizer);
if (stream == NULL) {
fprintf(stderr, "Failed to create offline stream.\n");
SherpaOnnxDestroyOfflineRecognizer(recognizer);
SherpaOnnxFreeWave(wave);
return -1;
}
SherpaOnnxAcceptWaveformOffline(stream, wave->sample_rate, wave->samples,
wave->num_samples);
SherpaOnnxDecodeOfflineStream(recognizer, stream);
const SherpaOnnxOfflineRecognizerResult *result =
SherpaOnnxGetOfflineStreamResult(stream);
printf("Recognized text: %s\n", result->text);
if (result->tokens_arr && result->timestamps && result->durations) {
printf("Token\tTimestamp\tDuration\n");
for (int32_t i = 0; i < result->count; ++i) {
printf("%s\t%.2f\t%.2f\n", result->tokens_arr[i], result->timestamps[i], result->durations[i]);
}
} else {
printf("Timestamps or durations not available.\n");
}
SherpaOnnxDestroyOfflineRecognizerResult(result);
SherpaOnnxDestroyOfflineStream(stream);
SherpaOnnxDestroyOfflineRecognizer(recognizer);
SherpaOnnxFreeWave(wave);
return 0;
}