offline-api.cpp
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// sherpa-onnx/sharp-api/offline-api.cpp
//
// Copyright (c) 2023 Manyeyes Corporation
#include "offline-api.h"
#include "sherpa-onnx/csrc/display.h"
#include "sherpa-onnx/csrc/offline-recognizer.h"
namespace sherpa_onnx
{
struct SherpaOnnxOfflineRecognizer {
sherpa_onnx::OfflineRecognizer* impl;
};
struct SherpaOnnxOfflineStream {
std::unique_ptr<sherpa_onnx::OfflineStream> impl;
explicit SherpaOnnxOfflineStream(std::unique_ptr<sherpa_onnx::OfflineStream> p)
: impl(std::move(p)) {}
};
struct SherpaOnnxDisplay {
std::unique_ptr<sherpa_onnx::Display> impl;
};
SherpaOnnxOfflineRecognizer* __stdcall CreateOfflineRecognizer(
const SherpaOnnxOfflineRecognizerConfig* config) {
sherpa_onnx::OfflineRecognizerConfig recognizer_config;
recognizer_config.feat_config.sampling_rate = config->feat_config.sample_rate;
recognizer_config.feat_config.feature_dim = config->feat_config.feature_dim;
if (strlen(config->model_config.transducer.encoder_filename) > 0) {
recognizer_config.model_config.transducer.encoder_filename =
config->model_config.transducer.encoder_filename;
recognizer_config.model_config.transducer.decoder_filename =
config->model_config.transducer.decoder_filename;
recognizer_config.model_config.transducer.joiner_filename =
config->model_config.transducer.joiner_filename;
}
else if (strlen(config->model_config.paraformer.model) > 0) {
recognizer_config.model_config.paraformer.model =
config->model_config.paraformer.model;
}
else if (strlen(config->model_config.nemo_ctc.model) > 0) {
recognizer_config.model_config.nemo_ctc.model =
config->model_config.nemo_ctc.model;
}
recognizer_config.model_config.tokens =
config->model_config.tokens;
recognizer_config.model_config.num_threads =
config->model_config.num_threads;
recognizer_config.model_config.debug =
config->model_config.debug;
recognizer_config.decoding_method = config->decoding_method;
SherpaOnnxOfflineRecognizer* recognizer =
new SherpaOnnxOfflineRecognizer;
recognizer->impl =
new sherpa_onnx::OfflineRecognizer(recognizer_config);
return recognizer;
}
SherpaOnnxOfflineStream* __stdcall CreateOfflineStream(
SherpaOnnxOfflineRecognizer* recognizer) {
SherpaOnnxOfflineStream* stream =
new SherpaOnnxOfflineStream(recognizer->impl->CreateStream());
return stream;
}
void __stdcall AcceptWaveform(
SherpaOnnxOfflineStream* stream,
int32_t sample_rate,
const float* samples, int32_t samples_size) {
std::vector<float> waveform{ samples, samples + samples_size };
stream->impl->AcceptWaveform(sample_rate, waveform.data(), waveform.size());
}
void __stdcall DecodeOfflineStream(
SherpaOnnxOfflineRecognizer* recognizer,
SherpaOnnxOfflineStream* stream) {
recognizer->impl->DecodeStream(stream->impl.get());
}
void __stdcall DecodeMultipleOfflineStreams(
SherpaOnnxOfflineRecognizer* recognizer,
SherpaOnnxOfflineStream** streams, int32_t n) {
std::vector<sherpa_onnx::OfflineStream*> ss(n);
for (int32_t i = 0; i != n; ++i) {
ss[i] = streams[i]->impl.get();
}
recognizer->impl->DecodeStreams(ss.data(), n);
}
SherpaOnnxOfflineRecognizerResult* __stdcall GetOfflineStreamResult(
SherpaOnnxOfflineStream* stream) {
sherpa_onnx::OfflineRecognitionResult result =
stream->impl->GetResult();
const auto& text = result.text;
auto r = new SherpaOnnxOfflineRecognizerResult;
r->text = new char[text.size() + 1];
std::copy(text.begin(), text.end(), const_cast<char*>(r->text));
const_cast<char*>(r->text)[text.size()] = 0;
r->text_len = text.size();
return r;
}
/// Free a pointer returned by CreateOfflineRecognizer()
///
/// @param p A pointer returned by CreateOfflineRecognizer()
void __stdcall DestroyOfflineRecognizer(
SherpaOnnxOfflineRecognizer* recognizer) {
delete recognizer->impl;
delete recognizer;
}
/// Destory an offline stream.
///
/// @param stream A pointer returned by CreateOfflineStream()
void __stdcall DestroyOfflineStream(SherpaOnnxOfflineStream* stream) {
delete stream;
}
/// Destroy the pointer returned by GetOfflineStreamResult().
///
/// @param r A pointer returned by GetOfflineStreamResult()
void __stdcall DestroyOfflineRecognizerResult(
SherpaOnnxOfflineRecognizerResult* r) {
delete r->text;
delete r;
}
}// namespace sherpa_onnx