Add C API for FireRedAsr AED model. (#1871)

c-api-examples/CMakeLists.txt

@@ -47,6 +47,9 @@ target_link_libraries(add-punctuation-c-api sherpa-onnx-c-api)
 add_executable(whisper-c-api whisper-c-api.c)
 target_link_libraries(whisper-c-api sherpa-onnx-c-api)
 
+add_executable(fire-red-asr-c-api fire-red-asr-c-api.c)
+target_link_libraries(fire-red-asr-c-api sherpa-onnx-c-api)
+
 add_executable(sense-voice-c-api sense-voice-c-api.c)
 target_link_libraries(sense-voice-c-api sherpa-onnx-c-api)
 

c-api-examples/fire-red-asr-c-api.c

@@ -0,0 +1,84 @@
+// c-api-examples/fire-red-asr-c-api.c
+//
+// Copyright (c)  2025  Xiaomi Corporation
+
+// We assume you have pre-downloaded the FireRedAsr model
+// from https://github.com/k2-fsa/sherpa-onnx/releases/tag/asr-models
+// An example is given below:
+//
+// clang-format off
+//
+// wget https://github.com/k2-fsa/sherpa-onnx/releases/download/asr-models/sherpa-onnx-fire-red-asr-large-zh_en-2025-02-16.tar.bz2
+// tar xvf sherpa-onnx-fire-red-asr-large-zh_en-2025-02-16.tar.bz2
+// rm sherpa-onnx-fire-red-asr-large-zh_en-2025-02-16.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 =
+      "./sherpa-onnx-fire-red-asr-large-zh_en-2025-02-16/test_wavs/0.wav";
+  const char *encoder_filename =
+      "sherpa-onnx-fire-red-asr-large-zh_en-2025-02-16/encoder.int8.onnx";
+  const char *decoder_filename =
+      "sherpa-onnx-fire-red-asr-large-zh_en-2025-02-16/decoder.int8.onnx";
+  const char *tokens_filename =
+      "sherpa-onnx-fire-red-asr-large-zh_en-2025-02-16/tokens.txt";
+  const char *provider = "cpu";
+
+  const SherpaOnnxWave *wave = SherpaOnnxReadWave(wav_filename);
+  if (wave == NULL) {
+    fprintf(stderr, "Failed to read %s\n", wav_filename);
+    return -1;
+  }
+
+  // Offline model config
+  SherpaOnnxOfflineModelConfig offline_model_config;
+  memset(&offline_model_config, 0, sizeof(offline_model_config));
+  offline_model_config.debug = 1;
+  offline_model_config.num_threads = 1;
+  offline_model_config.provider = provider;
+  offline_model_config.tokens = tokens_filename;
+  offline_model_config.fire_red_asr.encoder = encoder_filename;
+  offline_model_config.fire_red_asr.decoder = decoder_filename;
+
+  // 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 config!\n");
+
+    SherpaOnnxFreeWave(wave);
+
+    return -1;
+  }
+
+  const SherpaOnnxOfflineStream *stream =
+      SherpaOnnxCreateOfflineStream(recognizer);
+
+  SherpaOnnxAcceptWaveformOffline(stream, wave->sample_rate, wave->samples,
+                                  wave->num_samples);
+  SherpaOnnxDecodeOfflineStream(recognizer, stream);
+  const SherpaOnnxOfflineRecognizerResult *result =
+      SherpaOnnxGetOfflineStreamResult(stream);
+
+  fprintf(stderr, "Decoded text: %s\n", result->text);
+
+  SherpaOnnxDestroyOfflineRecognizerResult(result);
+  SherpaOnnxDestroyOfflineStream(stream);
+  SherpaOnnxDestroyOfflineRecognizer(recognizer);
+  SherpaOnnxFreeWave(wave);
+
+  return 0;
+}