wave-reader.cc
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// scripts/node-addon-api/src/wave-reader.cc
//
// Copyright (c) 2024 Xiaomi Corporation
#include <algorithm>
#include <sstream>
#include "napi.h" // NOLINT
#include "sherpa-onnx/c-api/c-api.h"
static Napi::Object ReadWaveWrapper(const Napi::CallbackInfo &info) {
Napi::Env env = info.Env();
if (info.Length() > 2) {
std::ostringstream os;
os << "Expect only 2 arguments. Given: " << info.Length();
Napi::TypeError::New(env, os.str()).ThrowAsJavaScriptException();
return {};
}
if (!info[0].IsString()) {
Napi::TypeError::New(env, "Argument 0 should be a string")
.ThrowAsJavaScriptException();
return {};
}
std::string filename = info[0].As<Napi::String>().Utf8Value();
bool enable_external_buffer = true;
if (info.Length() == 2) {
if (info[1].IsBoolean()) {
enable_external_buffer = info[1].As<Napi::Boolean>().Value();
} else {
Napi::TypeError::New(env, "Argument 1 should be a boolean")
.ThrowAsJavaScriptException();
return {};
}
}
const SherpaOnnxWave *wave = SherpaOnnxReadWave(filename.c_str());
if (!wave) {
std::ostringstream os;
os << "Failed to read '" << filename << "'";
Napi::TypeError::New(env, os.str()).ThrowAsJavaScriptException();
return {};
}
if (enable_external_buffer) {
Napi::ArrayBuffer arrayBuffer = Napi::ArrayBuffer::New(
env, const_cast<float *>(wave->samples),
sizeof(float) * wave->num_samples,
[](Napi::Env /*env*/, void * /*data*/, const SherpaOnnxWave *hint) {
SherpaOnnxFreeWave(hint);
},
wave);
Napi::Float32Array float32Array =
Napi::Float32Array::New(env, wave->num_samples, arrayBuffer, 0);
Napi::Object obj = Napi::Object::New(env);
obj.Set(Napi::String::New(env, "samples"), float32Array);
obj.Set(Napi::String::New(env, "sampleRate"), wave->sample_rate);
return obj;
} else {
// don't use external buffer
Napi::ArrayBuffer arrayBuffer =
Napi::ArrayBuffer::New(env, sizeof(float) * wave->num_samples);
Napi::Float32Array float32Array =
Napi::Float32Array::New(env, wave->num_samples, arrayBuffer, 0);
std::copy(wave->samples, wave->samples + wave->num_samples,
float32Array.Data());
Napi::Object obj = Napi::Object::New(env);
obj.Set(Napi::String::New(env, "samples"), float32Array);
obj.Set(Napi::String::New(env, "sampleRate"), wave->sample_rate);
SherpaOnnxFreeWave(wave);
return obj;
}
}
static Napi::Object ReadWaveFromBinaryWrapper(const Napi::CallbackInfo &info) {
Napi::Env env = info.Env();
if (info.Length() > 2) {
std::ostringstream os;
os << "Expect only 1 or 2 arguments. Given: " << info.Length();
Napi::TypeError::New(env, os.str()).ThrowAsJavaScriptException();
return {};
}
if (!info[0].IsTypedArray()) {
Napi::TypeError::New(env, "Argument 0 should be a float32 array")
.ThrowAsJavaScriptException();
return {};
}
Napi::Uint8Array data = info[0].As<Napi::Uint8Array>();
int32_t n = data.ElementLength();
const SherpaOnnxWave *wave = SherpaOnnxReadWaveFromBinaryData(reinterpret_cast<const char*>(data.Data()), n);
if (!wave) {
std::ostringstream os;
os << "Failed to read wave";
Napi::TypeError::New(env, os.str()).ThrowAsJavaScriptException();
return {};
}
bool enable_external_buffer = true;
if (info.Length() == 2) {
if (info[1].IsBoolean()) {
enable_external_buffer = info[1].As<Napi::Boolean>().Value();
} else {
Napi::TypeError::New(env, "Argument 1 should be a boolean")
.ThrowAsJavaScriptException();
return {};
}
}
if (enable_external_buffer) {
Napi::ArrayBuffer arrayBuffer = Napi::ArrayBuffer::New(
env, const_cast<float *>(wave->samples),
sizeof(float) * wave->num_samples,
[](Napi::Env /*env*/, void * /*data*/, const SherpaOnnxWave *hint) {
SherpaOnnxFreeWave(hint);
},
wave);
Napi::Float32Array float32Array =
Napi::Float32Array::New(env, wave->num_samples, arrayBuffer, 0);
Napi::Object obj = Napi::Object::New(env);
obj.Set(Napi::String::New(env, "samples"), float32Array);
obj.Set(Napi::String::New(env, "sampleRate"), wave->sample_rate);
return obj;
} else {
// don't use external buffer
Napi::ArrayBuffer arrayBuffer =
Napi::ArrayBuffer::New(env, sizeof(float) * wave->num_samples);
Napi::Float32Array float32Array =
Napi::Float32Array::New(env, wave->num_samples, arrayBuffer, 0);
std::copy(wave->samples, wave->samples + wave->num_samples,
float32Array.Data());
Napi::Object obj = Napi::Object::New(env);
obj.Set(Napi::String::New(env, "samples"), float32Array);
obj.Set(Napi::String::New(env, "sampleRate"), wave->sample_rate);
SherpaOnnxFreeWave(wave);
return obj;
}
}
void InitWaveReader(Napi::Env env, Napi::Object exports) {
exports.Set(Napi::String::New(env, "readWave"),
Napi::Function::New(env, ReadWaveWrapper));
exports.Set(Napi::String::New(env, "readWaveFromBinary"),
Napi::Function::New(env, ReadWaveFromBinaryWrapper));
}