X-Git-Url: https://hackdaworld.org/gitweb/?p=my-code%2Fmp3db.git;a=blobdiff_plain;f=mp3read.c;h=af6dfdd30494b55d8f9f88963e4edf3f65f6811f;hp=52d08f1e06f94b96c07be8cdb9e2d436e1ef5b41;hb=HEAD;hpb=69e5e4016a673ba184eaabb1a20c1b516717cd6a

diff --git a/mp3read.c b/mp3read.c
index 52d08f1..af6dfdd 100644
--- a/mp3read.c
+++ b/mp3read.c
@@ -1,6 +1,7 @@
-/* read mp3 info, hackbard */
+/* read mp3 header & tag, author: hackbard */
 
 #include <stdio.h>
+#include <stdlib.h>
 #include <unistd.h>
 #include <sys/types.h>
 #include <sys/stat.h>
@@ -8,44 +9,77 @@
 #include <string.h>
 #include <errno.h>
 
-#define MAX_READ 1024
-#define MAX_FILENAME 30
+#define ID_TAG_SIZE 128
+#define MAX_BUF_SIZE 32
+#define MAX_TITLE 30
+#define MAX_ARTIST 30
+#define MAX_ALBUM 30
+#define MAX_YEAR 4
+#define MAX_COMMENT 30
+#define MAX_GENRE 1
+
+#define MAX_FILENAME 256
+
+
+/*
+info:
+http://www.dv.co.yu/mpgscript/mpeghdr.htm
+*/
 
 int main (int argc,char **argv)
 {
- int file_fd,n_exit,count;
- char buf;
+ int file_fd;
+ int file_size;
+ unsigned char buf[MAX_BUF_SIZE];
  char filename[MAX_FILENAME];
 
+ memset(buf,0,sizeof(buf));
+
  strcpy(filename,argv[1]);
- printf("test: %s\n",filename);
+ file_size=atoi(argv[2]);
 
  if((file_fd=open(filename,O_RDONLY))<=0) {
   puts("open failed");
   return -23;
  }
 
- if((lseek(file_fd,atoi(argv[2])-MAX_READ,SEEK_SET))<0) {
-  perror("lseek");
+ if((lseek(file_fd,file_size-ID_TAG_SIZE,SEEK_SET))<0) {
+  puts("cannot seek to id tag");
   return -23;
  }
 
- count=1;
- n_exit=1;
- while(n_exit) {
-  n_exit=read(file_fd,&buf,1);
-  count++;
-  putchar(buf);
-  if(count==MAX_READ) break;
+ /* verify TAG now */
+ if((read(file_fd,&buf,3))<3) {
+  puts("read failed");
+  return -23;
  }
+ if(strncmp(buf,"TAG",3)) {
+  puts("TAG not found");
+  return -23;
+ }
+
+ read(file_fd,&buf,MAX_TITLE);
+ buf[MAX_TITLE-1]=0;
+ printf("title: %s<br>\n",buf);
+
+ read(file_fd,&buf,MAX_ARTIST);
+ buf[MAX_ARTIST-1]=0;
+ printf("artist: %s<br>\n",buf);
+
+ read(file_fd,&buf,MAX_ALBUM);
+ buf[MAX_ALBUM-1]=0;
+ printf("album: %s<br>\n",buf);
+
+ // read(file_fd,&buf,MAX_YEAR);
+ // printf("year: %s<br>\n",buf);
+
+ // read(file_fd,&buf,MAX_COMMENT);
+ // printf("comment: %s<br>\n",buf);
+
+ // read(file_fd,&buf,MAX_GENRE);
+ // printf("genre: %d<br>\n",(int)*buf);
 
  close(file_fd);
  
- puts("");
- puts("done");
- 
  return 23;
 }
-
-
-