8ee02c28b0
* code refactoring * Remove reference files * Update README and CI * small fixes * fix style issues * add style check for CI * fix style issues * remove kaldi-native-io
109 lines
3.2 KiB
C++
109 lines
3.2 KiB
C++
/**
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* Copyright 2022 Xiaomi Corporation (authors: Fangjun Kuang)
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*
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* See LICENSE for clarification regarding multiple authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "sherpa-onnx/csrc/wave-reader.h"
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#include <cassert>
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#include <fstream>
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#include <iostream>
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#include <utility>
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#include <vector>
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namespace sherpa_onnx {
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namespace {
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// see http://soundfile.sapp.org/doc/WaveFormat/
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//
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// Note: We assume little endian here
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// TODO(fangjun): Support big endian
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struct WaveHeader {
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void Validate() const {
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// F F I R
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assert(chunk_id == 0x46464952);
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assert(chunk_size == 36 + subchunk2_size);
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// E V A W
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assert(format == 0x45564157);
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assert(subchunk1_id == 0x20746d66);
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assert(subchunk1_size == 16); // 16 for PCM
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assert(audio_format == 1); // 1 for PCM
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assert(num_channels == 1); // we support only single channel for now
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assert(byte_rate == sample_rate * num_channels * bits_per_sample / 8);
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assert(block_align == num_channels * bits_per_sample / 8);
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assert(bits_per_sample == 16); // we support only 16 bits per sample
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}
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int32_t chunk_id;
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int32_t chunk_size;
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int32_t format;
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int32_t subchunk1_id;
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int32_t subchunk1_size;
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int16_t audio_format;
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int16_t num_channels;
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int32_t sample_rate;
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int32_t byte_rate;
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int16_t block_align;
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int16_t bits_per_sample;
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int32_t subchunk2_id;
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int32_t subchunk2_size;
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};
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static_assert(sizeof(WaveHeader) == 44, "");
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// Read a wave file of mono-channel.
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// Return its samples normalized to the range [-1, 1).
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std::vector<float> ReadWaveImpl(std::istream &is, float *sample_rate) {
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WaveHeader header;
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is.read(reinterpret_cast<char *>(&header), sizeof(header));
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assert(static_cast<bool>(is));
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header.Validate();
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*sample_rate = header.sample_rate;
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// header.subchunk2_size contains the number of bytes in the data.
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// As we assume each sample contains two bytes, so it is divided by 2 here
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std::vector<int16_t> samples(header.subchunk2_size / 2);
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is.read(reinterpret_cast<char *>(samples.data()), header.subchunk2_size);
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assert(static_cast<bool>(is));
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std::vector<float> ans(samples.size());
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for (int32_t i = 0; i != ans.size(); ++i) {
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ans[i] = samples[i] / 32768.;
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}
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return ans;
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}
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} // namespace
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std::vector<float> ReadWave(const std::string &filename,
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float expected_sample_rate) {
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std::ifstream is(filename, std::ifstream::binary);
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float sample_rate;
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auto samples = ReadWaveImpl(is, &sample_rate);
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if (expected_sample_rate != sample_rate) {
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std::cerr << "Expected sample rate: " << expected_sample_rate
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<< ". Given: " << sample_rate << ".\n";
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exit(-1);
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}
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return samples;
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}
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} // namespace sherpa_onnx
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