/*  
Copyright (c) 2002 Information Equipment co.,LTD. KOREA  
All Right Reserved. [ http://www.infoeq.com ]  
 
Code by JaeHyuk Cho < minzkn@infoeq.co.kr >  
2002.10.15  
*/  
 
#include <stdio.h>  
#include <sys/types.h>  
#include <unistd.h>  
#include <fcntl.h>  
#include <sys/stat.h>  
 
int main(int s_Argc, char **s_Argv);  
unsigned long MZ_MP3_Time(char *s_MP3_Name);  
 
int g_BitrateIndexTable[4][3][16] = {  
{ // Version 2.5  
{ // Layer I  
0, 32, 48, 56, 64, 80, 96, 112, 128, 144, 160, 176, 192, 224, 256, (-1)  
},  
{ // Layer II  
0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160, (-1)  
},  
{ // Layer III  
0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160, (-1)  
}  
},  
{ // Version reserved  
{0,},{0,},{0,}  
},  
{ // Version 2.0 (ISO / IEC 13818-3)  
{ // Layer I  
0, 32, 48, 56, 64, 80, 96, 112, 128, 144, 160, 176, 192, 224, 256, (-1)  
},  
{ // Layer II  
0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160, (-1)  
},  
{ // Layer III  
0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160, (-1)  
}  
},  
{ // Version 1.0 (ISO / IEC 11172-3)  
{ // Layer I  
0, 32, 64, 96, 128, 160, 192, 224, 256, 288, 320, 352, 384, 416, 448, (-1)  
},  
{ // Layer II  
0, 32, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320, 384, (-1)  
},  
{ // Layer III  
0, 32, 40, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320, (-1)  
}  
}  
};  
 
int g_FrequencyTable[4][4] = {  
{ // Version 2.5  
11025, 12000, 8000, (-1)  
},  
{ // Version reserved  
(-1),  
},  
{ // Version 2.0  
22050, 24000, 16000, (-1)  
},  
{ // Version 1.0  
44100, 48000, 32000, (-1)  
}  
};  
 
char *g_ChannelModeString[] = {  
"Stereo", "Joint steroeo", "Dual stereo", "Single stereo"  
};  
 
char *g_LayerString[] = {  
"Layer I", "Layer II", "Layer III"  
};  
 
int main(int s_Argc, char **s_Argv)  
{  
int s_Return = 0;  
if(s_Argc >= 2)  
{  
int s_Count;  
int s_Hour, s_Min, s_Sec;  
for(s_Count = 1;s_Count < s_Argc;s_Count++)  
{  
s_Return = MZ_MP3_Time(s_Argv[s_Count]);  
if(s_Return > 0)  
{  
s_Sec = s_Return % 60;  
s_Min = s_Return / 60;  
s_Hour = s_Return / 3600;  
fprintf(stdout, "\"%s\" - %02d:%02d:%02d\n", s_Argv[s_Count], s_Hour, s_Min, s_Sec);  
}  
else fprintf(stdout, "\"%s\" - Unknown MP3 format\n", s_Argv[s_Count]);  
}  
}  
else fprintf(stderr, "mp3_time <mp3 file>\n");  
return(s_Return);  
}  
 
unsigned long MZ_MP3_Time(char *s_MP3_Name)  
{  
unsigned long s_Return = 0lu;  
if(s_MP3_Name)  
{  
int s_Handle;  
s_Handle = open(s_MP3_Name, O_RDONLY);  
if(s_Handle >= 0)  
{  
int s_ReadSize;  
unsigned long s_Header = 0lu;  
unsigned char s_Buffer;  
unsigned long s_VersionID = 0lu, s_Layer = 0lu, s_BitrateIndex = 0lu, s_FrequencyIndex = 0lu, s_Padding = 0lu;  
//unsigned long s_Protection = 0lu, s_ChannelMode = 0lu, s_ModeExtension = 0lu, s_Copyright = 0lu, s_Original = 0lu, s_Emphasis = 0lu;  
 
unsigned long s_FrameSize = 0lu, s_FrameCount = 0lu;  
 
do  
{  
s_ReadSize = read(s_Handle, &s_Buffer, sizeof(unsigned char));  
if(s_ReadSize > 0)  
{  
s_Header = (s_Header << 8) | (unsigned long)(s_Buffer & 0xff);  
if((s_Header & 0xffe00000lu) == 0xffe00000lu)  
{  
s_VersionID = (s_Header >> 19) & 0x03;  
s_Layer = (s_Header >> 17) & 0x03;  
//s_Protection = (s_Header >> 16) & 0x01;  
s_BitrateIndex = (s_Header >> 12) & 0x0f;  
s_FrequencyIndex = (s_Header >> 10) & 0x03;  
s_Padding = (s_Header >> 9) & 0x01;  
//s_ChannelMode = (s_Header >> 6) & 0x03;  
//s_ModeExtension = (s_Header >> 4) & 0x03;  
//s_Copyright = (s_Header >> 3) & 0x01;  
//s_Original = (s_Header >> 2) & 0x01;  
//s_Emphasis = (s_Header >> 0) & 0x03;  
if(s_VersionID != 0x01 &&  
s_Layer != 0x00 &&  
s_BitrateIndex != 0x0f && s_BitrateIndex != 0 &&  
s_FrequencyIndex != 0x03  
)  
{  
switch((3 - s_Layer))  
{  
case 0: // Layer I  
s_FrameSize = 12000lu * g_BitrateIndexTable[s_VersionID][3 - s_Layer][s_BitrateIndex];  
s_FrameSize /= g_FrequencyTable[s_VersionID][s_FrequencyIndex];  
s_FrameSize = ((s_FrameSize + s_Padding)<<2) - 4;  
break;  
case 1: // Layer II  
s_FrameSize = 144000lu * g_BitrateIndexTable[s_VersionID][3 - s_Layer][s_BitrateIndex];  
s_FrameSize /= g_FrequencyTable[s_VersionID][s_FrequencyIndex];  
s_FrameSize += s_Padding - 4;  
case 2: // Layer III  
default:  
s_FrameSize = 144000lu * g_BitrateIndexTable[s_VersionID][3 - s_Layer][s_BitrateIndex];  
s_FrameSize /= g_FrequencyTable[s_VersionID][s_FrequencyIndex] << (s_VersionID == 0x03 ? 0 : 1);  
s_FrameSize = s_FrameSize + s_Padding - 4;  
break;  
}  
s_Header = 0lu;  
if(s_FrameSize > 0)  
{  
s_FrameCount++;  
lseek(s_Handle, s_FrameSize, SEEK_CUR);  
}  
}  
}  
}  
}while(s_ReadSize > 0);  
close(s_Handle);  
s_Return = (((s_FrameCount * 1152) / g_FrequencyTable[s_VersionID][s_FrequencyIndex]) >> (s_VersionID == 0x03 ? 0 : 1));  
}  
else fprintf(stderr, "mp3_time.c: MZ_MP3_Time - [ERROR] Can not open mp3 \"%s\" !!!\n", s_MP3_Name);  
}  
else fprintf(stderr, "mp3_time.c: MZ_MP3_Time - [ERROR] s_MP3_Name is null !!!\n");  
return(s_Return);  
}  
 
/* End of source */