offline-recognizer.h
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// sherpa-onnx/csrc/offline-recognizer.h
//
// Copyright (c) 2023 Xiaomi Corporation
#ifndef SHERPA_ONNX_CSRC_OFFLINE_RECOGNIZER_H_
#define SHERPA_ONNX_CSRC_OFFLINE_RECOGNIZER_H_
#include <memory>
#include <string>
#include <vector>
#if __ANDROID_API__ >= 9
#include "android/asset_manager.h"
#include "android/asset_manager_jni.h"
#endif
#include "sherpa-onnx/csrc/offline-lm-config.h"
#include "sherpa-onnx/csrc/offline-model-config.h"
#include "sherpa-onnx/csrc/offline-stream.h"
#include "sherpa-onnx/csrc/offline-transducer-model-config.h"
#include "sherpa-onnx/csrc/parse-options.h"
namespace sherpa_onnx {
struct OfflineRecognitionResult;
struct OfflineRecognizerConfig {
OfflineFeatureExtractorConfig feat_config;
OfflineModelConfig model_config;
OfflineLMConfig lm_config;
std::string decoding_method = "greedy_search";
int32_t max_active_paths = 4;
std::string hotwords_file;
float hotwords_score = 1.5;
// only greedy_search is implemented
// TODO(fangjun): Implement modified_beam_search
OfflineRecognizerConfig() = default;
OfflineRecognizerConfig(const OfflineFeatureExtractorConfig &feat_config,
const OfflineModelConfig &model_config,
const OfflineLMConfig &lm_config,
const std::string &decoding_method,
int32_t max_active_paths,
const std::string &hotwords_file,
float hotwords_score)
: feat_config(feat_config),
model_config(model_config),
lm_config(lm_config),
decoding_method(decoding_method),
max_active_paths(max_active_paths),
hotwords_file(hotwords_file),
hotwords_score(hotwords_score) {}
void Register(ParseOptions *po);
bool Validate() const;
std::string ToString() const;
};
class OfflineRecognizerImpl;
class OfflineRecognizer {
public:
~OfflineRecognizer();
#if __ANDROID_API__ >= 9
OfflineRecognizer(AAssetManager *mgr, const OfflineRecognizerConfig &config);
#endif
explicit OfflineRecognizer(const OfflineRecognizerConfig &config);
/// Create a stream for decoding.
std::unique_ptr<OfflineStream> CreateStream() const;
/** Create a stream for decoding.
*
* @param The hotwords for this string, it might contain several hotwords,
* the hotwords are separated by "/". In each of the hotwords, there
* are cjkchars or bpes, the bpe/cjkchar are separated by space (" ").
* For example, hotwords I LOVE YOU and HELLO WORLD, looks like:
*
* "▁I ▁LOVE ▁YOU/▁HE LL O ▁WORLD"
*/
std::unique_ptr<OfflineStream> CreateStream(
const std::string &hotwords) const;
/** Decode a single stream
*
* @param s The stream to decode.
*/
void DecodeStream(OfflineStream *s) const {
OfflineStream *ss[1] = {s};
DecodeStreams(ss, 1);
}
/** Decode a list of streams.
*
* @param ss Pointer to an array of streams.
* @param n Size of the input array.
*/
void DecodeStreams(OfflineStream **ss, int32_t n) const;
private:
std::unique_ptr<OfflineRecognizerImpl> impl_;
};
} // namespace sherpa_onnx
#endif // SHERPA_ONNX_CSRC_OFFLINE_RECOGNIZER_H_