vc下mp3 IDv1和IDV2的读取

/*这是修改后的代码,VC下读ID3v2 & ID3v1 , 读mp3_tagHeader都没问题.*/

/******************************************************************
File : mp3info.c
*******************************************************************************/

#include<stdio.h>
#include<io.h>
#include<string.h>
#include<stdlib.h>

/*******************************************************************************/

void main()
{
FILE *fp;
int bHasID3V2;
char cVer;
char cRevision;
int bHasExtHeader=0;
int ID3V2_size;
#define ID3V1_size 128
char cID3V2_head[10];
char cID3v2Frame_head[10];
char *cID3v2Frame;
long iID3v2Frame_length;

/*##########################Symbol In Frame###################################*/

long iFrameStart,iFrameMove=0, iFrameCount=0;
unsigned long iFrameSize=0;
char cFrameHead_bin[33];
char cFrameHead_bin_temp[9];

/*##########################Symbol In ID3V1###################################*/

char cID3V1[128];

/*##########################Symbol Above######################################*/
unsigned char* cBuffer;
int SamplingrateTable [3][3]={{44100,22050,11025},{48000,24000,120000},{32000,16000,8000}};
char* ChannelDescrip[4]={"立体声","混合立体声","双声","单声"};

int cBuffer_size=1024,Bitrate,FrameSize,FrameCount,mp3Duration;
char LayerDescript ,bRateIndex ,bSampleRate,Version,bPadding,bChannelMode;
long int flength;

int i=0,j=0;
char argv[]={"yzhforce.mp3"};

/*##########################Symbol Above######################################*/

void getBin( int ,char* );
int GetBitRate(int ,int , int );//函数宣告

if((fp=fopen(argv,"rb"))==NULL)
{
printf("ERROR:can't open the file!");
getchar();
exit(1);
}

/*##########################ID3V2 Reading#####################################*/

fread(cID3V2_head,10,1,fp);
if( (cID3V2_head[0]=='I'||cID3V2_head[1]=='i')
&&(cID3V2_head[1]=='D'||cID3V2_head[2]=='d')
&&cID3V2_head[2]=='3')
{
bHasID3V2=1;
cVer=cID3V2_head[3];
cRevision=cID3V2_head[4];

if(cID3V2_head[5]&0x64==0x64) bHasExtHeader = 1;
if(cID3V2_head[5]&0x10==0x10) bHasExtHeader = 1;

ID3V2_size = (cID3V2_head[6]&0x7F)*0x200000
+ (cID3V2_head[7]&0x7F)*0x400
+ (cID3V2_head[8]&0x7F)*0x80
+ (cID3V2_head[9]&0x7F);

printf("ID3V2_size:%d bytes\n",ID3V2_size);
iFrameStart=--ID3V2_size;
}
else
{
bHasID3V2=0;
printf("\nThere is no ID3V2*");
}

rewind(fp);/*改文件指针指向文件头*/
fseek(fp,10L,1);

while((ftell(fp)+10)<=ID3V2_size)
{
memset(cID3v2Frame_head,0,10);/*内存清空*/
fread(cID3v2Frame_head,10,1,fp);/*ID3V2帧信息头读取*/

iID3v2Frame_length =(long)(cID3v2Frame_head[4]*0x100000000
+cID3v2Frame_head[5]*0x10000
+cID3v2Frame_head[6]*0x100
+cID3v2Frame_head[7]);/*计算帧的大小.*/

if (cID3v2Frame_head[0]=='\0'
&& cID3v2Frame_head[1]=='\0'
&& cID3v2Frame_head[2]=='\0'
&& cID3v2Frame_head[3]=='\0')
break;

for (i=0;i<4;i++) putchar(cID3v2Frame_head[i]); /*FrameSign(4)*/
putchar('-');putchar('>'); /* Print "->"*/

cID3v2Frame=malloc(iID3v2Frame_length);/* 为 cID3v2Frame 指针分配内存, 功能类似于VB中的动

态数组*/
if (cID3v2Frame!=NULL)// 检测动态内存分配是否已经成功
{
fread(cID3v2Frame,iID3v2Frame_length,1,fp);

i=0;
while(i<iID3v2Frame_length)
{
putchar(cID3v2Frame[i]);
i++;
}

putchar('\n');
free(cID3v2Frame);
}
else
{
if (fp!=NULL) fclose(fp);
printf("ERROR:Memory Exhausted!");
exit(1);

}
}

putchar('*');
putchar('\n');

/*########################## (mp3_FrameHeader) Reading #####################################*/
fseek(fp, 0L, SEEK_END); //移文件指针到文件尾
flength = ftell(fp); //文件长

rewind(fp);
fseek(fp,10+ID3V2_size,1);
while((ftell(fp)+4)<flength)
{
if (ftell(fp)+1024<=flength)
cBuffer_size=1024;
else
cBuffer_size=flength-ftell(fp);

cBuffer=malloc(cBuffer_size);
if (cBuffer==NULL)// 检测动态内存分配是否已经成功
{
if (fp!=NULL) fclose(fp);
printf("ERROR:Memory Exhausted!");
exit(1);

}
memset(cBuffer,0,cBuffer_size);
fread(cBuffer,cBuffer_size,1,fp);
for(i=0;i<(cBuffer_size-4); i++)
{
//Mp3帧头(FRAMEHEADER)格式如下：AAAAAAAA AAABBCCD EEEEFFGH IIJJKLMM
LayerDescript = (cBuffer[i+1] & 0x6)>>1;//Part CC IN 'AAABBCCD' ,Layer description '00' -

reserved
//Part EEEE in 'EEEEFFGH', But '1111' is Bad Bitrate index, "bad" means that this is not an allowed value
bRateIndex = cBuffer[i+2] /0x10 ;// EEEEXXXX!='1111'
bSampleRate = (cBuffer[i+2] & 0xA) >>2 ;//Part FF IN 'EEEEFFGH' ,'11' reserved

if (cBuffer[i] ==0xFF
&& cBuffer[i+1] > 0xE0
&& bRateIndex != 0xF
&& LayerDescript != 0x0
&& bSampleRate < 0x3 )
{
printf("Mp3_FrameHeader->");
memset(cFrameHead_bin,0,32);
j=cBuffer[i];
getBin(j,cFrameHead_bin_temp);
strcat(cFrameHead_bin,cFrameHead_bin_temp);
putchar('-');

j=cBuffer[i+1];
getBin(j,cFrameHead_bin_temp);
strcat(cFrameHead_bin,cFrameHead_bin_temp); //strcat 的两个传入参数都必需以 '\0' 代表结

尾
putchar('-');

j=cBuffer[i+2];
getBin(j,cFrameHead_bin_temp);
strcat(cFrameHead_bin,cFrameHead_bin_temp);
putchar('-');

j=cBuffer[i+3];
getBin(j,cFrameHead_bin_temp);
strcat(cFrameHead_bin,cFrameHead_bin_temp);

Version = (cBuffer[i+1] & 0x18)>>3;
bPadding=(cBuffer[i+1] & 0x2)>>1;
Bitrate = GetBitRate(bRateIndex, LayerDescript, Version);
bChannelMode=(cBuffer[i+3] & 0xC0)>>6;
putchar ('\n');

if (bRateIndex != 0)
{
switch (Version)
{
case 0:
printf("MPEG 2.5 层 %d, %dHz %s\n",4-LayerDescript,
SamplingrateTable[bSampleRate][2],ChannelDescrip[bChannelMode]);

FrameSize = ((72 * Bitrate*1000) / SamplingrateTable[bSampleRate][2]) +

bPadding;
FrameCount=(int)((flength-(ftell(fp)-cBuffer_size+i)) /FrameSize);
mp3Duration=(int)(FrameCount*0.026);//每帧的播放时间：无论帧长

是多少，每帧的播放时间都是26ms；
printf("CBR:-> %dKbit %d帧\n",Bitrate,FrameCount);
printf("长度:%d 秒",mp3Duration);
break;
case 2:
printf("MPEG 2.0 层 %d, %dHz %s\n",4-LayerDescript,
SamplingrateTable[bSampleRate][1],ChannelDescrip[bChannelMode]);

FrameSize = ((72 * Bitrate*1000) / SamplingrateTable[bSampleRate][1]) +

bPadding;
FrameCount=(int)((flength-(ftell(fp)-cBuffer_size+i)) /FrameSize);
mp3Duration=(int)(FrameCount*0.026);//每帧的播放时间：无论帧长

是多少，每帧的播放时间都是26ms；
printf("CBR:-> %dKbit %d帧\n",Bitrate,FrameCount);
printf("长度:%d 秒",mp3Duration);
break;
case 3:
printf("MPEG 1.0 层 %d, %dHz %s\n",4-LayerDescript,
SamplingrateTable[bSampleRate][0],ChannelDescrip[bChannelMode]);

FrameSize = ((144 * Bitrate*1000) / SamplingrateTable[bSampleRate][0]) +

bPadding;
FrameCount=(int)((flength-(ftell(fp)-cBuffer_size+i)) /FrameSize);
mp3Duration=(int)(FrameCount*0.026);//每帧的播放时间：无论帧长

是多少，每帧的播放时间都是26ms；

printf("CBR:-> %dKbit %d帧\n",Bitrate,FrameCount);
printf("长度:%d 秒",mp3Duration);
break;
}
}
else
printf("\nThis a Free Rate MP3 File!\n");

cBuffer_size=-1;
break;
}

}
free(cBuffer);
if (cBuffer_size ==(-1) ) break;
}

/*##########################ID3V1 Reading#####################################*/

fseek(fp,-128L,SEEK_END);
fread(cID3V1,ID3V1_size ,1,fp);

if( (cID3V1[0]=='T'||cID3V1[0]=='t')
&&(cID3V1[1]=='A'||cID3V1[1]=='a')
&&(cID3V1[2]=='G'||cID3V1[2]=='g'))
{
printf("\n*\nID3V1_size:%d bytes\n",ID3V1_size );
for(i=0;i<128;i++) putchar(cID3V1[i]);
putchar('|');
putchar('\n');
}
else
{
printf("\nThere is no ID3V1*");
}

fclose(fp);
getchar();
}


void getBin( int dec,char* bin)
{
int i,j,len;
char temp[8];
memset(temp,0,8);
itoa(dec,temp,2);///把整数i转换成字符串将i转换为字符串放入temp中,最后一个数字表示2进制
len=strlen(temp);
memset(bin,0,strlen(bin));

for(i=0,j=0;i<8;i++,j++)
{
if (temp[j]!='\0')
bin[i]=temp[j];
else
bin[i]='0';
}
bin[i]='\0';
for(i=0,j=0;i<8;i++,j++) putchar(bin[i]);

}

int GetBitRate(int bRateIndex,int LayerDescript, int Version)
{
int BitrateTable[6][15]=
{
{-1,32,64,96,128,160,192,224,256,288,320,352,384,416,448},
{-1,32,48,56,64,80,96,112,128,160,192,224,256,320,384},
{-1,32,40,48,56,64,80,96,112,128,160,192,224,256,320},
{-1,32,64,96,128,160,192,2324,256,288,320,352,384,416,448},
{-1,32,48,56,64,80,96,112,128,160,192,224,256,320,384},
{-1,8,16,24,32,64,80,56,64,128,160,112,128,256,320}
}; //kbps (-1) means :free
int i,j;
if (Version==3 && LayerDescript==3 )j=0;
else if (Version==3 && LayerDescript==2 )j=1;
else if (Version==3 && LayerDescript==1 )j=2;
else if (Version==2 && LayerDescript==1 )j=3;
else if (Version==2 && LayerDescript==2 )j=4;
else if (Version==2 && LayerDescript==3 )j=5;

i=BitrateTable[j][bRateIndex];
return i;
}

评论

1 楼 baby8117628 2011-03-27