标签:style io os ar for strong 文件 数据 sp
WAVE文件格式说明表:
|
偏移地址 |
字节数 |
数据类型 |
内 容 |
文件头 |
00H |
4 |
char |
"RIFF"标志 |
04H |
4 |
long int |
文件长度 |
|
08H |
4 |
char |
"WAVE"标志 |
|
0CH |
4 |
char |
"fmt"标志 |
|
10H |
4 |
|
过渡字节(不定) |
|
14H |
2 |
int |
格式类别(10H为PCM形式的声音数据) |
|
16H |
2 |
int |
通道数,单声道为1,双声道为2 |
|
18H |
4 |
int |
采样率(每秒样本数),表示每个通道的播放速度, |
|
1CH |
4 |
long int |
波形音频数据传送速率,其值为通道数×每秒数据位数×每样本的数据位数/8。播放软件利用此值可以估计缓冲区的大小。 |
|
20H |
2 |
int |
数据块的调整数(按字节算的),其值为通道数×每样本的数据位值/8。播放软件需要一次处理多个该值大小的字节数据,以便将其值用于缓冲区的调整。 |
|
22H |
2 |
|
每样本的数据位数,表示每个声道中各个样本的数据位数。如果有多个声道,对每个声道而言,样本大小都一样。 |
|
24H |
4 |
char |
数据标记符"data" |
|
28H |
4 |
long int |
语音数据的长度 |
PCM数据的存放方式:
|
样本1 |
样本2 |
||
8位单声道 |
0声道 |
0声道 |
||
8位立体声 |
0声道(左) |
1声道(右) |
0声道(左) |
1声道(右) |
16位单声道 |
0声道低字节 |
0声道高字节 |
0声道低字节 |
0声道高字节 |
16位立体声 |
0声道(左)低字节 |
0声道(左)高字节 |
1声道(右)低字节 |
1声道(右)高字节 |
读取wav文件所有字段,并原封不动写入一个新的wav文件: wav_write.cpp
#include <iostream> #include <fstream> #include <string.h> #include<math.h> #include<cmath> #include<stdlib.h> #include <bitset> #include <iomanip> using namespace std; struct my_wave { unsigned long chunckId; unsigned long chunkSize; unsigned long format; unsigned long subChunk1Id; unsigned long subChunk1Size; unsigned short audioFormat; unsigned short numChannels; unsigned long sampleRate; unsigned long byteRate; unsigned short blockAlign; unsigned short bitsPerSampel; unsigned long subChunk2Id; unsigned long subChunk2Size; unsigned char *z_data; }; int main(int argc, char **argv) { ifstream fs; ofstream ofs; my_wave MW; //读取原始文件 fs.open("F:\\wave.wav", ios::binary | ios::in); //这句需要修改成您的文件路径 ofs.open("F:\\waveout.wav", ios::binary | ios::out); //读取的文件写入新文件 //读取wav文件的所有字段 fs.seekg(0); fs.read((char*)&MW.chunckId, sizeof(MW.chunckId)); fs.seekg(0x04); fs.read((char*)&MW.chunkSize, sizeof(MW.chunkSize)); fs.seekg(0x08); fs.read((char*)&MW.format, sizeof(MW.format)); fs.seekg(0x0c); fs.read((char*)&MW.subChunk1Id, sizeof(MW.subChunk1Id)); fs.seekg(0x10); fs.read((char*)&MW.subChunk1Size, sizeof(MW.subChunk1Size)); fs.seekg(0x14); fs.read((char*)&MW.audioFormat, sizeof(MW.audioFormat)); fs.seekg(0x16); fs.read((char*)&MW.numChannels, sizeof(MW.numChannels)); fs.seekg(0x18); fs.read((char*)&MW.sampleRate, sizeof(MW.sampleRate)); fs.seekg(0x1c); fs.read((char*)&MW.byteRate, sizeof(MW.byteRate)); fs.seekg(0x20); fs.read((char*)&MW.blockAlign, sizeof(MW.blockAlign)); fs.seekg(0x22); fs.read((char*)&MW.bitsPerSampel, sizeof(MW.bitsPerSampel)); fs.seekg(0x24); fs.read((char*)&MW.subChunk2Id, sizeof(MW.subChunk2Id)); fs.seekg(0x28); fs.read((char*)&MW.subChunk2Size, sizeof(MW.subChunk2Size)); MW.z_data = new unsigned char[MW.subChunk2Size]; fs.seekg(0x2c); fs.read((char *)MW.z_data, sizeof(char)*MW.subChunk2Size); //输出wav文件的所有字段,以供测试 cout << MW.chunckId << endl; cout << MW.chunkSize << endl; cout << MW.format << endl; cout << MW.subChunk1Id << endl; cout << MW.subChunk1Size << endl; cout << MW.audioFormat << endl; cout << MW.numChannels << endl; cout << MW.sampleRate << endl; cout << MW.byteRate << endl; cout << MW.blockAlign << endl; cout << MW.bitsPerSampel << endl; cout << MW.subChunk2Id << endl; cout << MW.subChunk2Size << endl; cout << "采样数据:" << endl; for (int k = 0; k < MW.subChunk2Size; k++){ printf("%x ",MW.z_data[k]); } //将每个字段原封不动得写入新的.wav文件中 ofs.write((char*)&MW.chunckId, sizeof(MW.chunckId)); ofs.write((char*)&MW.chunkSize, sizeof(MW.chunkSize)); ofs.write((char*)&MW.format, sizeof(MW.format)); ofs.write((char*)&MW.subChunk1Id, sizeof(MW.subChunk1Id)); ofs.write((char*)&MW.subChunk1Size, sizeof(MW.subChunk1Size)); ofs.write((char*)&MW.audioFormat, sizeof(MW.audioFormat)); ofs.write((char*)&MW.numChannels, sizeof(MW.numChannels)); ofs.write((char*)&MW.sampleRate, sizeof(MW.sampleRate)); ofs.write((char*)&MW.byteRate, sizeof(MW.byteRate)); ofs.write((char*)&MW.blockAlign, sizeof(MW.blockAlign)); ofs.write((char*)&MW.bitsPerSampel, sizeof(MW.bitsPerSampel)); ofs.write((char*)&MW.subChunk2Id, sizeof(MW.subChunk2Id)); ofs.write((char*)&MW.subChunk2Size, sizeof(MW.subChunk2Size)); ofs.write((char*)MW.z_data, sizeof(char)*MW.subChunk2Size); fs.close(); ofs.close(); delete[] MW.z_data; system("pause"); }
标签:style io os ar for strong 文件 数据 sp
原文地址:http://my.oschina.net/liusicong/blog/324078