Add C API for spoken language identification. (#695)

c-api-examples/spoken-language-identification-c-api.c

@@ -0,0 +1,65 @@
+
+// We assume you have pre-downloaded the whisper multi-lingual models
+// from https://github.com/k2-fsa/sherpa-onnx/releases/tag/asr-models
+// An example command to download the "tiny" whisper model is given below:
+//
+// clang-format off
+//
+// wget https://github.com/k2-fsa/sherpa-onnx/releases/download/asr-models/sherpa-onnx-whisper-tiny.tar.bz2
+// tar xvf sherpa-onnx-whisper-tiny.tar.bz2
+// rm sherpa-onnx-whisper-tiny.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() {
+  SherpaOnnxSpokenLanguageIdentificationConfig config;
+
+  memset(&config, 0, sizeof(config));
+
+  config.whisper.encoder = "./sherpa-onnx-whisper-tiny/tiny-encoder.int8.onnx";
+  config.whisper.decoder = "./sherpa-onnx-whisper-tiny/tiny-decoder.int8.onnx";
+  config.num_threads = 1;
+  config.debug = 1;
+  config.provider = "cpu";
+
+  const SherpaOnnxSpokenLanguageIdentification *slid =
+      SherpaOnnxCreateSpokenLanguageIdentification(&config);
+  if (!slid) {
+    fprintf(stderr, "Failed to create spoken language identifier");
+    return -1;
+  }
+
+  // You can find more test waves from
+  // https://hf-mirror.com/spaces/k2-fsa/spoken-language-identification/tree/main/test_wavs
+  const char *wav_filename = "./sherpa-onnx-whisper-tiny/test_wavs/0.wav";
+  const SherpaOnnxWave *wave = SherpaOnnxReadWave(wav_filename);
+  if (wave == NULL) {
+    fprintf(stderr, "Failed to read %s\n", wav_filename);
+    return -1;
+  }
+
+  SherpaOnnxOfflineStream *stream =
+      SherpaOnnxSpokenLanguageIdentificationCreateOfflineStream(slid);
+
+  AcceptWaveformOffline(stream, wave->sample_rate, wave->samples,
+                        wave->num_samples);
+
+  const SherpaOnnxSpokenLanguageIdentificationResult *result =
+      SherpaOnnxSpokenLanguageIdentificationCompute(slid, stream);
+
+  fprintf(stderr, "wav_filename: %s\n", wav_filename);
+  fprintf(stderr, "Detected language: %s\n", result->lang);
+
+  SherpaOnnxDestroySpokenLanguageIdentificationResult(result);
+  DestroyOfflineStream(stream);
+  SherpaOnnxFreeWave(wave);
+  SherpaOnnxDestroySpokenLanguageIdentification(slid);
+
+  return 0;
+}