Add C++ runtime for non-streaming faster conformer transducer from NeMo. (#854)

sherpa-onnx/csrc/offline-stream.h

@@ -11,6 +11,7 @@
 #include <vector>
 
 #include "sherpa-onnx/csrc/context-graph.h"
+#include "sherpa-onnx/csrc/features.h"
 #include "sherpa-onnx/csrc/parse-options.h"
 
 namespace sherpa_onnx {
@@ -32,46 +33,12 @@ struct OfflineRecognitionResult {
   std::string AsJsonString() const;
 };
 
-struct OfflineFeatureExtractorConfig {
-  // Sampling rate used by the feature extractor. If it is different from
-  // the sampling rate of the input waveform, we will do resampling inside.
-  int32_t sampling_rate = 16000;
-
-  // Feature dimension
-  int32_t feature_dim = 80;
-
-  // Set internally by some models, e.g., paraformer and wenet CTC models set
-  // it to false.
-  // This parameter is not exposed to users from the commandline
-  // If true, the feature extractor expects inputs to be normalized to
-  // the range [-1, 1].
-  // If false, we will multiply the inputs by 32768
-  bool normalize_samples = true;
-
-  // For models from NeMo
-  // This option is not exposed and is set internally when loading models.
-  // Possible values:
-  // - per_feature
-  // - all_features (not implemented yet)
-  // - fixed_mean (not implemented)
-  // - fixed_std (not implemented)
-  // - or just leave it to empty
-  // See
-  // https://github.com/NVIDIA/NeMo/blob/main/nemo/collections/asr/parts/preprocessing/features.py#L59
-  // for details
-  std::string nemo_normalize_type;
-
-  std::string ToString() const;
-
-  void Register(ParseOptions *po);
-};
-
 struct WhisperTag {};
 struct CEDTag {};
 
 class OfflineStream {
  public:
-  explicit OfflineStream(const OfflineFeatureExtractorConfig &config = {},
+  explicit OfflineStream(const FeatureExtractorConfig &config = {},
                          ContextGraphPtr context_graph = {});
 
   explicit OfflineStream(WhisperTag tag);