initial check in of TAG info c source and shell wrapper

[my-code/mp3db.git] / mp3read.c

diff --git a/mp3read.c b/mp3read.c
index 0236f31..b8c527f 100644 (file)
--- 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>
@@ -8,9 +9,17 @@
 #include <string.h>
 #include <errno.h>
 
-#define MAX_READ 1024
+#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 32
-#define MAX_VER_ID 64
+
 
 /*
 info:
@@ -19,51 +28,54 @@ http://www.dv.co.yu/mpgscript/mpeghdr.htm
 
 int main (int argc,char **argv)
 {
- int file_fd,exit,count;
- unsigned char buf;
- unsigned char header[3];
- char mpeg_ver_id[MAX_VER_ID];
+ int file_fd;
+ int file_size;
+ unsigned char buf[MAX_BUF_SIZE];
  char filename[MAX_FILENAME];
 
  strcpy(filename,argv[1]);
+ file_size=atoi(argv[2]);
 
  if((file_fd=open(filename,O_RDONLY))<=0) {
   puts("open failed");
   return -23;
  }
 
- count=0;
- exit=0;
- while(!exit) {
-  printf("count=%d\n",count++);
-  read(file_fd,&buf,1);
-  if(buf==0xff) {
-   read(file_fd,&buf,1);
-   if(buf>=0xe0) {
-    puts("got frame header:");
-    exit=1;
-    header[0]=buf;
-    read(file_fd,header+1,2);
-
-    printf("debug: %x%x%x \n",header[0],header[1],header[2]);
-  
-    if(((header[0]&0x18)>>3)==0x00) strcpy(mpeg_ver_id,"MPEG Version 2.5");
-    else if(((header[0]&0x18)>>3)==0x10) strcpy(mpeg_ver_id,"MPEG Version 2 (ISO/IEC 13818-3)");
-    else if(((header[0]&0x18)>>3)==0x11) strcpy(mpeg_ver_id,"MPEG Version 1 (ISO/IEC 11172-3)");
-    else strcpy(mpeg_ver_id,"unknown");
-
-    printf("version: %s\n",mpeg_ver_id);
-   }
-  }
+ if((lseek(file_fd,file_size-ID_TAG_SIZE,SEEK_SET))<0) {
+  puts("cannot seek to id tag");
+  return -23;
+ }
+
+ /* verify TAG now */
+ if((read(file_fd,&buf,3))<3) {
+  puts("read failed (1)");
+  return -23;
  }
 
+ if(strncmp(buf,"TAG",3)) {
+  puts("TAG not found");
+  return -23;
+ }
+
+ read(file_fd,&buf,MAX_TITLE);
+ printf("title: %s\n",buf);
+
+ read(file_fd,&buf,MAX_ARTIST);
+ printf("artist: %s\n",buf);
+
+ read(file_fd,&buf,MAX_ALBUM);
+ printf("album: %s\n",buf);
+
+ read(file_fd,&buf,MAX_YEAR);
+ printf("year: %s\n",buf);
+
+ read(file_fd,&buf,MAX_COMMENT);
+ printf("comment: %s\n",buf);
+
+ read(file_fd,&buf,MAX_GENRE);
+ printf("genre: %c\n",*buf);
+
  close(file_fd);
  
- puts("");
- puts("done");
- 
  return 23;
 }
-
-
-