PHung Tung / MyClasses_Functions

?

SD_WavReader.cpp@0:cacfc9e25452, 2019-06-04 (annotated)

Committer:
phungductung
Date:
Tue Jun 04 21:58:08 2019 +0000
Revision:
0:cacfc9e25452
?;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
phungductung 0:cacfc9e25452 1 //--------------------------------------------------------------
phungductung 0:cacfc9e25452 2 // SD_WavReader class
phungductung 0:cacfc9e25452 3 // SD カードの *.wav ファイルの内容を読み出す
phungductung 0:cacfc9e25452 4 // 以下のフォーマット以外は扱わない
phungductung 0:cacfc9e25452 5 // PCM，16 ビットステレオ，標本化周波数 44.1 kHz
phungductung 0:cacfc9e25452 6 //
phungductung 0:cacfc9e25452 7 // 2016/06/17, Copyright (c) 2016 MIKAMI, Naoki
phungductung 0:cacfc9e25452 8 //--------------------------------------------------------------
phungductung 0:cacfc9e25452 9
phungductung 0:cacfc9e25452 10 #include "SD_WavReader.hpp"
phungductung 0:cacfc9e25452 11
phungductung 0:cacfc9e25452 12 namespace Mikami
phungductung 0:cacfc9e25452 13 {
phungductung 0:cacfc9e25452 14 SD_WavReader::SD_WavReader(int32_t bufferSize)
phungductung 0:cacfc9e25452 15 : STR_("sd"), ok_(false)
phungductung 0:cacfc9e25452 16 {
phungductung 0:cacfc9e25452 17 sd_ = new SDFileSystem(STR_.c_str());
phungductung 0:cacfc9e25452 18 sd_->mount();
phungductung 0:cacfc9e25452 19 buffer.SetSize(bufferSize*2);
phungductung 0:cacfc9e25452 20 }
phungductung 0:cacfc9e25452 21
phungductung 0:cacfc9e25452 22 SD_WavReader::~SD_WavReader()
phungductung 0:cacfc9e25452 23 {
phungductung 0:cacfc9e25452 24 sd_->unmount();
phungductung 0:cacfc9e25452 25 delete sd_;
phungductung 0:cacfc9e25452 26 }
phungductung 0:cacfc9e25452 27
phungductung 0:cacfc9e25452 28 void SD_WavReader::Open(const string fileName)
phungductung 0:cacfc9e25452 29 {
phungductung 0:cacfc9e25452 30 string name = (string)"/" + STR_ + "/" + fileName;
phungductung 0:cacfc9e25452 31 fp_ = fopen(name.c_str(), "rb");
phungductung 0:cacfc9e25452 32 if (fp_ == NULL) ErrorMsg("Khong the mo!!");
phungductung 0:cacfc9e25452 33 }
phungductung 0:cacfc9e25452 34
phungductung 0:cacfc9e25452 35
phungductung 0:cacfc9e25452 36 // ファイルのヘッダ (RIFFxxxxWAVEfm ) 読み込み
phungductung 0:cacfc9e25452 37 // 戻り値： *.wav で，16 ビットステレオ，
phungductung 0:cacfc9e25452 38 // 標本化周波数：44.1 kHz の場合 true
phungductung 0:cacfc9e25452 39 bool SD_WavReader::IsWavFile()
phungductung 0:cacfc9e25452 40 {
phungductung 0:cacfc9e25452 41 char data[17];
phungductung 0:cacfc9e25452 42 fread(data, 1, 16, fp_);
phungductung 0:cacfc9e25452 43 string strRead = "";
phungductung 0:cacfc9e25452 44 for (int n=0; n<4; n++) strRead += data[n];
phungductung 0:cacfc9e25452 45 for (int n=8; n<16; n++) strRead += data[n];
phungductung 0:cacfc9e25452 46
phungductung 0:cacfc9e25452 47 // "RIFF", "WAVE", "fmt " が存在することを確認
phungductung 0:cacfc9e25452 48 if (strRead != "RIFFWAVEfmt ") return false;
phungductung 0:cacfc9e25452 49
phungductung 0:cacfc9e25452 50 // fmt chunck のサイズを取得
phungductung 0:cacfc9e25452 51 uint32_t fmtChunkSize;
phungductung 0:cacfc9e25452 52 fread(&fmtChunkSize, sizeof(uint32_t), 1, fp_);
phungductung 0:cacfc9e25452 53
phungductung 0:cacfc9e25452 54 // PCM, Stereo, 44.1 kHz, 16 bit であることを確認
phungductung 0:cacfc9e25452 55 WaveFormatEx fmtData;
phungductung 0:cacfc9e25452 56 fread(&fmtData, fmtChunkSize, 1, fp_);
phungductung 0:cacfc9e25452 57 if ((fmtData.wFormatTag != 1) ||
phungductung 0:cacfc9e25452 58 (fmtData.nChannels != 2) ||
phungductung 0:cacfc9e25452 59 (fmtData.nSamplesPerSec != 44100) ||
phungductung 0:cacfc9e25452 60 (fmtData.wBitsPerSample != 16)
phungductung 0:cacfc9e25452 61 ) return false;
phungductung 0:cacfc9e25452 62
phungductung 0:cacfc9e25452 63 // data chunk を探す
phungductung 0:cacfc9e25452 64 char dataId[5];
phungductung 0:cacfc9e25452 65 dataId[4] = 0;
phungductung 0:cacfc9e25452 66 fread(dataId, 1, 4, fp_);
phungductung 0:cacfc9e25452 67 if ("data" != (string)dataId)
phungductung 0:cacfc9e25452 68 for (int n=0; n<100; n++)
phungductung 0:cacfc9e25452 69 {
phungductung 0:cacfc9e25452 70 char oneByte;
phungductung 0:cacfc9e25452 71 fread(&oneByte, 1, 1, fp_);
phungductung 0:cacfc9e25452 72 for (int k=0; k<3; k++)
phungductung 0:cacfc9e25452 73 dataId[k] = dataId[k+1];
phungductung 0:cacfc9e25452 74 dataId[3] = oneByte;
phungductung 0:cacfc9e25452 75 if ("data" == (string)dataId) break;
phungductung 0:cacfc9e25452 76
phungductung 0:cacfc9e25452 77 if (n == 99) return false;
phungductung 0:cacfc9e25452 78 }
phungductung 0:cacfc9e25452 79
phungductung 0:cacfc9e25452 80 // データサイズ (byte) を取得
phungductung 0:cacfc9e25452 81 int32_t sizeByte;
phungductung 0:cacfc9e25452 82 fread(&sizeByte, sizeof(int32_t), 1, fp_);
phungductung 0:cacfc9e25452 83 size_ = sizeByte/4;
phungductung 0:cacfc9e25452 84
phungductung 0:cacfc9e25452 85 ok_ = true;
phungductung 0:cacfc9e25452 86 return true;
phungductung 0:cacfc9e25452 87 }
phungductung 0:cacfc9e25452 88
phungductung 0:cacfc9e25452 89 // ファイルからステレオデータの取得
phungductung 0:cacfc9e25452 90 void SD_WavReader::ReadStereo(Array<int16_t>& dataL,
phungductung 0:cacfc9e25452 91 Array<int16_t>& dataR)
phungductung 0:cacfc9e25452 92 {
phungductung 0:cacfc9e25452 93 if (!ok_) ErrorMsg("Lay du lieu that bai");
phungductung 0:cacfc9e25452 94 uint32_t size = dataL.Length();
phungductung 0:cacfc9e25452 95 fread(buffer, sizeof(int16_t), size*2, fp_);
phungductung 0:cacfc9e25452 96 for (int n=0; n<size; n++)
phungductung 0:cacfc9e25452 97 {
phungductung 0:cacfc9e25452 98 dataL[n] = buffer[2*n];
phungductung 0:cacfc9e25452 99 dataR[n] = buffer[2*n+1];
phungductung 0:cacfc9e25452 100 }
phungductung 0:cacfc9e25452 101 }
phungductung 0:cacfc9e25452 102
phungductung 0:cacfc9e25452 103 // ファイルからデータをモノラルに変換しての取得
phungductung 0:cacfc9e25452 104 void SD_WavReader::ReadAndToMono(Array<int16_t>& data)
phungductung 0:cacfc9e25452 105 {
phungductung 0:cacfc9e25452 106 if (!ok_) ErrorMsg("Lay du lieu that bai");
phungductung 0:cacfc9e25452 107 uint32_t size = data.Length();
phungductung 0:cacfc9e25452 108 fread(buffer, sizeof(int16_t), size*2, fp_);
phungductung 0:cacfc9e25452 109 for (int n=0; n<size; n++)
phungductung 0:cacfc9e25452 110 data[n] = (buffer[2*n] + buffer[2*n+1])/2;
phungductung 0:cacfc9e25452 111 }
phungductung 0:cacfc9e25452 112
phungductung 0:cacfc9e25452 113 // データサイズ（標本化点の数）の取得
phungductung 0:cacfc9e25452 114 int32_t SD_WavReader::GetSize()
phungductung 0:cacfc9e25452 115 {
phungductung 0:cacfc9e25452 116 if (!ok_) ErrorMsg("Loi dung luong du lieu");
phungductung 0:cacfc9e25452 117 return size_;
phungductung 0:cacfc9e25452 118 }
phungductung 0:cacfc9e25452 119 }