mp3 音频 音乐 tag ID3 ID3V1 ID3V2 标签 读取信息 获得图片 jpeg bmp 图片转换(下)

1.语言

在这里我是用的c c++来实现的，在windows下。

 

2.思路

这里必须先读取mp3源文件，然后对每段数据读取处理

 

3.具体细节

主要用到了文件操作，用fopen打开mp3文件，用fread读取，记住fread读取是按字节的，也就是每次读取一个字节保存到数组。你可能还需要fseek来甚至从哪里读取信息。还有写函数fwrite。

还需要字符处理函数memcpy,strncmp,strcmp,ZeroMemory,strcpy等，记住声明的变量一定要初始化，尤其是数组和字符串变量。

 

4.其他

音频除了mp3，还有aac wma等格式，这些里面也有标签，但是和mp3的不一样。mp3里面除了ID3还有APE等标签，其格式也不同。不过大多数音频是mp3，用的是ID3

 

5.代码：

#include <stdio.h>#include <stdlib.h>#include <memory.h>#include <math.h>#define XMD_H#include "jpeglib.h"#include <setjmp.h>#include <afxwin.h>#include <Windows.h>#include <initguid.h>#include <ShlObj.h>#pragma comment(lib, "jpeg.lib")//id3v2 标签头结构体typedef struct{char  identi[3];//必须为ID3，否则认为标签不存在byte  major;    //版本号byte  revsion;  //副版本号byte  flags;    //标志位byte  size[4]; //标签大小，不包括标签头的10个字节}ID3V2Header;//标签帧头结构体typedef struct{char FrameId[4];//标签帧标识符，用来表明这个标签帧的内容byte size[4];    //此标签帧的大小，不包括此标签头的10个字节byte flags[2];  //标志位}ID3V2Frameheader;char *MusicName="Skylar Grey - I Love the way u lie.mp3";//char *MusicName="home.mp3";long width = 0;long height = 0;FILE *OpenMusic(int &Len){FILE *fp=NULL;fp=fopen(MusicName,"rb");if(!fp){printf("无法打开文件\n");fp=NULL;return fp;}//把打开的音乐文件流的内部指针重置到文件开头fseek(fp,0,SEEK_SET);//读取标签头ID3V2Header mp3ID3V2;ZeroMemory(&mp3ID3V2,10);fread(&mp3ID3V2,10,1,fp);//判断有没有id3v2的标签头if(0!=strncmp(mp3ID3V2.identi,"ID3",3)){printf("没有ID2V2标签\n");fclose(fp);fp=NULL;return fp;}//计算处整个标签的大小Len = (mp3ID3V2.size[0]&0x7f)*0x200000+(mp3ID3V2.size[1]&0x7f)*0x4000+(mp3ID3V2.size[2]&0x7f)*0x80+(mp3ID3V2.size[3]&0x7f);return fp;}BOOL GetPicInfo(FILE *fp, int &dwFrame, int Len, int &tempi){ID3V2Frameheader pFrameBuf;ZeroMemory(&pFrameBuf,10);fread(&pFrameBuf,10,1,fp);int i=0;//找到图片标签的所在位置while((strncmp(pFrameBuf.FrameId,"APIC",4) != 0)){//判断是否有图片if(i>Len){printf("没有找到标识图像帧的标签\n");return FALSE;}dwFrame= pFrameBuf.size[0]*0x1000000+pFrameBuf.size[1]*0x10000+pFrameBuf.size[2]*0x100+pFrameBuf.size[3];fseek(fp,dwFrame,SEEK_CUR);ZeroMemory(&pFrameBuf,10);fread(&pFrameBuf,10,1,fp);i++;}//计算出图片标签的大小dwFrame= pFrameBuf.size[0]*0x1000000+pFrameBuf.size[1]*0x10000+pFrameBuf.size[2]*0x100+pFrameBuf.size[3];char image_tag[7]={"0"};char pic_type[5]={"0"};fread(image_tag,6,1,fp);//判断图片格式i=0;while(true){if(i>dwFrame){printf("没有找到标识图像类型的标签\n");fclose(fp);return FALSE;}if(0==(strcmp(image_tag,"image/"))){tempi+=6;fread(pic_type,4,1,fp);//mp3里面大多图片都是jpeg，也是以jpeg作为标志的//也有以jpe，jpg，peg作为标志的//不过也有png等格式的。if(0==strncmp(pic_type,"jpeg",4)){tempi+=4;break;}else if(0==strncmp(pic_type,"jpg",3)){tempi+=3;fseek(fp,-1,SEEK_CUR);break;}else if(0==strncmp(pic_type,"peg",3)){tempi+=3;fseek(fp,-1,SEEK_CUR);break;}else{printf("图片格式不是jpeg\n");fclose(fp);return FALSE;}}else{i++;fseek(fp,-5,SEEK_CUR);fread(image_tag,6,1,fp);tempi=tempi+1;continue;}}return TRUE;}void GetPicRGB(FILE *fp, int dwFrame, int tempi){TCHAR lpTempPathBuffer[MAX_PATH];TCHAR szTempFileName[MAX_PATH];DWORD dwRetVal=0;UINT uRetVal=0;BYTE  *pPicData;unsigned char * bmpDataBuffer=NULL;//这两个tag的是表明图片数据的开始//jpeg图片开始的标志是0xFFD8BYTE jpeg_header_tag1;BYTE jpeg_header_tag2;fseek(fp,0,SEEK_CUR);fread(&jpeg_header_tag1,1,1,fp);fseek(fp,0,SEEK_CUR);fread(&jpeg_header_tag2,1,1,fp);//计算出图片数据开始的地方int i=0;while(true){if(i>dwFrame){printf("没有找到图像数据\n");fclose(fp);bmpDataBuffer=NULL;}i++;if((255==jpeg_header_tag1) && (216==jpeg_header_tag2)){pPicData = new BYTE[dwFrame-tempi];ZeroMemory(pPicData,dwFrame-tempi);//设定文件流的指针位置，并把图片的数据读入pPicDatafseek(fp,-2,SEEK_CUR);fread(pPicData,dwFrame-tempi,1,fp);fclose(fp);fp=fopen("temp.jpeg","w+b");fwrite(pPicData,dwFrame-tempi,1,fp);delete []pPicData;DeleteFile(szTempFileName);break;}else{fseek(fp,-1,SEEK_CUR);fread(&jpeg_header_tag1,1,1,fp);fseek(fp,0,SEEK_CUR);fread(&jpeg_header_tag2,1,1,fp);tempi++;continue;}}    struct jpeg_decompress_struct cinfo;    struct jpeg_error_mgr jerr;    cinfo.err = jpeg_std_error(&jerr);    jpeg_create_decompress(&cinfo);fseek(fp,0,SEEK_SET);    jpeg_stdio_src(&cinfo,fp);jpeg_read_header(&cinfo,1);    width = cinfo.image_width;    height = cinfo.image_height;    JSAMPARRAY buffer;    jpeg_start_decompress(&cinfo);bmpDataBuffer=new unsigned char[width*height*3];    buffer=(*cinfo.mem->alloc_sarray)    ((j_common_ptr) &cinfo, JPOOL_IMAGE, (width*3), 1);//获得图像rgb源数据，存入数组bmpDataBuffer    while(cinfo.output_scanline < cinfo.output_height){int j=0;jpeg_read_scanlines(&cinfo, buffer, 1);if(cinfo.num_components==1){//这个地方是把256转成24.我们得到的256的bmp图片，是在头信息的地方加了一个调色板//调色板的大小是1024，是四个字节表示一种颜色，一共256种颜色//256bmp下面不是rgb数据，是针对于调色板的一个索引，一个字节，8位，共可以表示2的8次方，也就是256种颜色//如果num_componets=1也就表示是一种黑白的图片，黑白的图片的调色板的每种颜色的rgb是相等的，就是如果rgb相等//显示出来的颜色是黑白的。这时我们可以用两种bmp来显示这个图片//一个是256，调色板加索引数据//另一种是24位图，24的bmp是没有调色板，后面3位表示一个颜色的rgb，所以是2^8*2^8*2^8，共可以表示2^24种颜色//基于上面256灰度图的索引值就是rgb值，因为3个相等，所以可以把上面的256灰度的bmp去掉调色板，把每个索引用//3位表示，值和索引一样，3个值也一样，这样就转成了一个24位的灰度图for(j=0;j<width;j++){bmpDataBuffer[(height - cinfo.output_scanline)*(width*3)+3*j] = buffer[0][j]; //Rj++;bmpDataBuffer[(height - cinfo.output_scanline)*(width*3)+3*j+1] = buffer[0][j]; //Gj++;bmpDataBuffer[(height - cinfo.output_scanline)*(width*3)+3*j+2] = buffer[0][j]; //B}}if(cinfo.num_components==3){for(j=0;j<(width*3);j++){bmpDataBuffer[(height - cinfo.output_scanline)*(width*3)+j] = buffer[0][j+2]; //Rj++;bmpDataBuffer[(height - cinfo.output_scanline)*(width*3)+j] = buffer[0][j]; //Gj++;bmpDataBuffer[(height - cinfo.output_scanline)*(width*3)+j] = buffer[0][j-2]; //B}}}jpeg_finish_decompress(&cinfo);jpeg_destroy_decompress(&cinfo);//关闭临时文件指针，删除临时文件fclose(fp);    remove(szTempFileName);BITMAPFILEHEADER fileHeader;BITMAPINFOHEADER infoHeader;//bmp header(fileHeader)ZeroMemory(&fileHeader, sizeof(BITMAPFILEHEADER));fileHeader.bfType = 'MB';fileHeader.bfSize = sizeof(BITMAPFILEHEADER)+ sizeof(BITMAPINFOHEADER) + (height * width * 3);fileHeader.bfOffBits = sizeof(BITMAPFILEHEADER)+ sizeof(BITMAPINFOHEADER) ;//bmp infoheader(infoHeader)ZeroMemory(&infoHeader, sizeof(infoHeader));infoHeader.biSize = sizeof(infoHeader);infoHeader.biWidth = width;infoHeader.biHeight = height;infoHeader.biPlanes = 1;infoHeader.biBitCount = 24;infoHeader.biCompression = BI_RGB;infoHeader.biSizeImage = width * height;infoHeader.biXPelsPerMeter = 0;infoHeader.biYPelsPerMeter = 0;infoHeader.biClrUsed = 0;infoHeader.biClrImportant = 0;FILE *fpbmp=fopen("a.bmp","w+b");fwrite(&fileHeader,sizeof(fileHeader),1,fpbmp);fwrite(&infoHeader,sizeof(infoHeader),1,fpbmp);fwrite(bmpDataBuffer,width*height*3,1,fpbmp);fclose(fpbmp);}void jpgtobmp(const char *strSourceFileName, const char *strDestFileName){BITMAPFILEHEADER bfh;// bmp文件头BITMAPINFOHEADER bih;// bmp头信息RGBQUAD rq[256];// 调色板int nAdjust; // 用于字节对齐char indata[1000000]; // 用于存放解压缩前的图像数据，该数据直接从jpg文件读取BYTE *data= NULL;int nComponent = 0;// 声明解压缩对象及错误信息管理器struct jpeg_decompress_struct cinfo;struct jpeg_error_mgr jerr;cinfo.err = jpeg_std_error(&jerr);jpeg_create_decompress(&cinfo);FILE *f = fopen(strSourceFileName,"rb");if (f==NULL){printf("Open file error!\n");return;}// 下面代码用于解压缩，从本行开始解压缩jpeg_stdio_src(&cinfo, f );jpeg_read_header(&cinfo, TRUE);nAdjust = cinfo.image_width*cinfo.num_components%4;if (nAdjust) nAdjust = 4-nAdjust;data = new BYTE[(cinfo.image_width*cinfo.num_components+nAdjust)*cinfo.image_height];jpeg_start_decompress(&cinfo);JSAMPROW row_pointer[1];while (cinfo.output_scanline < cinfo.output_height){row_pointer[0] = &data[(cinfo.output_height - cinfo.output_scanline-1)*(cinfo.image_width*cinfo.num_components+nAdjust)];jpeg_read_scanlines(&cinfo,row_pointer ,1);}jpeg_finish_decompress(&cinfo);jpeg_destroy_decompress(&cinfo);// 上面代码用于解压缩，到本行为止解压缩完成fclose(f);// 以下代码讲解压缩后的图像存入文件，可以根据实际应用做其他处理，如传输f=fopen(strDestFileName,"wb");if (f==NULL) {delete [] data;//delete [] pDataConv;return;}// 写文件头memset(&bfh,0,sizeof(bfh));bfh.bfSize = sizeof(bfh)+sizeof(bih);bfh.bfOffBits = sizeof(bfh)+sizeof(bih);if (cinfo.num_components==1){bfh.bfOffBits += 1024;bfh.bfSize += 1024;}bfh.bfSize += (cinfo.image_width*cinfo.num_components+nAdjust)*cinfo.image_height;bfh.bfType = 0x4d42;fwrite(&bfh,sizeof(bfh),1,f);// 写图像信息bih.biBitCount = cinfo.num_components*8;bih.biSize = sizeof(bih);bih.biWidth = cinfo.image_width;bih.biHeight = cinfo.image_height;bih.biPlanes = 1;bih.biCompression = 0;bih.biSizeImage = (cinfo.image_width*cinfo.num_components+nAdjust)*cinfo.image_height;bih.biXPelsPerMeter = 0;bih.biYPelsPerMeter = 0;bih.biClrUsed = 0;bih.biClrImportant = 0;fwrite(&bih,sizeof(bih),1,f);// 写调色板if (cinfo.num_components ==1){for (int i=0;i<256;i++){rq[i].rgbBlue =i;rq[i].rgbGreen = i;rq[i].rgbRed = i;rq[i].rgbReserved = 0;}fwrite(rq,1024,1,f);}if (cinfo.num_components==3){// 调整rgb顺序for (int j=0;j<bih.biHeight;j++)for (int i = 0;i<bih.biWidth;i++){BYTE red = data[j*(cinfo.image_width*cinfo.num_components+nAdjust)+i*3];data[j*(cinfo.image_width*cinfo.num_components+nAdjust)+i*3] = data[j*(cinfo.image_width*cinfo.num_components+nAdjust)+i*3+2];data[j*(cinfo.image_width*cinfo.num_components+nAdjust)+i*3+2] = red;}}fwrite(data,(cinfo.image_width*cinfo.num_components+nAdjust)*cinfo.image_height,1,f);fclose(f);delete [] data;}void jpgtobmp1(const char *strSourceFileName, const char *strDestFileName){BITMAPFILEHEADER bfh;// bmp文件头BITMAPINFOHEADER bih;// bmp头信息RGBQUAD rq[256];// 调色板int nAdjust; // 用于字节对齐char indata[1000000]; // 用于存放解压缩前的图像数据，该数据直接从jpg文件读取BYTE *data= NULL;BYTE *data1=NULL;int nComponent = 3;int just;// 声明解压缩对象及错误信息管理器struct jpeg_decompress_struct cinfo;struct jpeg_error_mgr jerr;cinfo.err = jpeg_std_error(&jerr);jpeg_create_decompress(&cinfo);FILE *f = fopen(strSourceFileName,"rb");if (f==NULL){printf("Open file error!\n");return;}// 下面代码用于解压缩，从本行开始解压缩jpeg_stdio_src(&cinfo, f );jpeg_read_header(&cinfo, TRUE);nAdjust = cinfo.image_width*cinfo.num_components%4;if (nAdjust) nAdjust = 4-nAdjust;just = cinfo.image_width*nComponent%4;if (just) just = 4-just;data = new BYTE[(cinfo.image_width*cinfo.num_components+nAdjust)*cinfo.image_height];data1=new BYTE[(cinfo.image_width*nComponent+just)*cinfo.image_height];jpeg_start_decompress(&cinfo);JSAMPROW row_pointer[1];while (cinfo.output_scanline < cinfo.output_height){row_pointer[0] = &data[(cinfo.output_height - cinfo.output_scanline-1)*(cinfo.image_width*cinfo.num_components+nAdjust)];jpeg_read_scanlines(&cinfo,row_pointer ,1);}jpeg_finish_decompress(&cinfo);jpeg_destroy_decompress(&cinfo);// 上面代码用于解压缩，到本行为止解压缩完成fclose(f);// 以下代码讲解压缩后的图像存入文件，可以根据实际应用做其他处理，如传输f=fopen(strDestFileName,"wb");if (f==NULL) {delete [] data;//delete [] pDataConv;return;}// 写文件头memset(&bfh,0,sizeof(bfh));bfh.bfSize = sizeof(bfh)+sizeof(bih);bfh.bfOffBits = sizeof(bfh)+sizeof(bih);bfh.bfSize += (cinfo.image_width*nComponent+just)*cinfo.image_height;bfh.bfType = 0x4d42;fwrite(&bfh,sizeof(bfh),1,f);// 写图像信息bih.biBitCount = nComponent*8;bih.biSize = sizeof(bih);bih.biWidth = cinfo.image_width;bih.biHeight = cinfo.image_height;bih.biPlanes = 1;bih.biCompression = 0;bih.biSizeImage = (cinfo.image_width*nComponent+just)*cinfo.image_height;bih.biXPelsPerMeter = 0;bih.biYPelsPerMeter = 0;bih.biClrUsed = 0;bih.biClrImportant = 0;fwrite(&bih,sizeof(bih),1,f);for(int testi=0; testi<((cinfo.image_width*cinfo.num_components+nAdjust)*cinfo.image_height); testi++){data1[testi*3]=data[testi];data1[testi*3+1]=data[testi];data1[testi*3+2]=data[testi];}fwrite(data1,(cinfo.image_width*nComponent+just)*cinfo.image_height,1,f);fclose(f);delete [] data;}int main(){FILE *fp=NULL;//ID3大小int Len=0;fp=OpenMusic(Len);if(NULL==fp){return 0;}//图片帧大小int dwFrame=0;//记录图片标签数据中不是图片数据的字节数int tempi=0;if(FALSE==GetPicInfo(fp,dwFrame,Len,tempi)){return 0;}//获取图片数据GetPicRGB(fp,dwFrame,tempi);jpgtobmp("temp.jpeg","b.bmp");jpgtobmp1("temp.jpeg","c.bmp");return 1;}