获取mp3里的id3信息代码,C代码库,德仔网

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【C】获取mp3里的id3信息
作者:大黄 / 发布于2012/10/8/ 748
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <inttypes.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <math.h>
#include <iconv.h></div>
<div>define MAX_ID3_KEYS 16
struct id3_v2_header
{
 char id3[4];
 char ver_major;
 char ver_minor;
 char flags;
 uint32_t size;
};</div>
<div>struct id3_v2_frame_header
{
 char id[4];
 uint32_t size;
 uint16_t flags;
};</div>
<div>struct id3_v2_frame_contents
{
 unsigned char id[4];
 unsigned int size;
 unsigned char *contents;
};</div>
<div>struct id3tag
{
 int num;
 struct id3_v2_frame_contents v2[MAX_ID3_KEYS];
};</div>
<div>char *utf16_to_utf8(const char *from, const char *to, char *src_str, int count)
{
 iconv_t cv;
 size_t len, utf8len;
 char *pin, *pout, *utf8p;</div>
<div> cv = iconv_open(to, from);
 if (cv < 0)
 {
 printf("iconv_open error\n");
 return NULL;
 }
 len = count;
 pin = src_str;
 utf8len = 4 * len;
 pout = (char *)calloc(1, utf8len);</div>
<div> utf8p = pout;
 if (iconv(cv, &pin, &len, &pout, &utf8len) < 0)
 {
 printf("iconv error\n");
 return NULL;
 }
<div> iconv_close(cv);</div>
<div> return utf8p;
}
<div>static int output_id3tag(struct id3tag *id3)
{
 int fd;
 int i;
 char *out_string;
 char *tmp;</div>
<div> fd = open("id3.txt", O_CREAT | O_RDWR, S_IRWXU);
 for (i = 0; i < MAX_ID3_KEYS; i++)
 {
 if (id3->v2[i].size != 0)
 {
  if (strncmp(id3->v2[i].id, "APIC", 4) != 0 && strncmp(id3->v2[i].id, "TXXX", 4) != 0)
 {
 write(fd, id3->v2[i].contents, id3->v2[i].size);
 out_string = utf16_to_utf8("UTF-16LE", "UTF-8", id3->v2[i].contents, id3->v2[i].size);
 if (out_string) {
printf ("--- %s---\n", out_string);
tmp = id3->v2[i].contents;
id3->v2[i].contents = out_string;
free(tmp);
 }
 }
 }
 }

 close(fd);
}
<div>void id3tag_init(struct id3tag *id3)
{
 memset(id3, 0, sizeof(*id3));
}
<div>void id3tag_free(struct id3tag *id3)
{
 int i;</div>
<div> for (i = 0; i < MAX_ID3_KEYS; i++)
 if (id3->v2[i].contents != NULL)
 free(id3->v2[i].contents);
}
<div>static int add_id3tag(struct id3tag *id3, struct id3_v2_frame_header *fh, unsigned char *buf)
{
 char *tmp, *out_string;
 int i;</div>
<div> if (id3->num < MAX_ID3_KEYS)
 {
 strncpy( id3->v2[id3->num].id, fh->id, 4);
 id3->v2[id3->num].contents = (unsigned char *)calloc(1, fh->size);
 memcpy(id3->v2[id3->num].contents, buf+11, fh->size-1);
 id3->v2[id3->num].size = fh->size - 1;</div>
<div> if (id3->v2[i].size != 0)
 {
  if (strncmp(id3->v2[id3->num].id, "APIC", 4) != 0 && strncmp(id3->v2[id3->num].id, "TXXX", 4) != 0)
 {
 
 out_string = utf16_to_utf8("UTF-16", "UTF-8", id3->v2[id3->num].contents, id3->v2[id3->num].size);
 if (out_string) {
//printf ("--- %s---\n", out_string);
tmp = id3->v2[id3->num].contents;
 id3->v2[id3->num].contents = out_string;
free(tmp);
 }
 }
 }
<div> id3->num++;
 }
}
static void print_id3tag(struct id3tag *id3)
{
 int i;</div>
<div> for (i = 0; i < MAX_ID3_KEYS; i++)
 {
 if (id3->v2[i].size != 0)
{
 printf("%c%c%c%c:", id3->v2[i].id[0],id3->v2[i].id[1],id3->v2[i].id[2],id3->v2[i].id[3]);
 printf("%s\n", id3->v2[i].contents);
}
 }
}
<div>static ssize_t read_all(int fd, void *buf, size_t count)
{
 char *buffer = buf;
 int pos = 0;</div>
<div> do 
 {
 int rc;</div>
<div> rc = read(fd, buffer + pos, count - pos);
 if (rc == -1) {
if (errno == EINTR || errno == EAGAIN)
 continue;
return -1;
 }
 if (rc == 0) {
/* eof */
break;
 }
 pos += rc;
 } while (count - pos > 0);
 return pos;
}
<div>
static void print_v2_header(struct id3_v2_header *vh)
{
 printf("%s\n" , vh->id3);
 printf("major:%d\n", vh->ver_major);
 printf("minor:%d\n", vh->ver_minor);
 printf("flags:%d\n", vh->flags);
 printf("Size:%d\n", vh->size);
}
<div>static void print_v2_frame_header(struct id3_v2_frame_header *fh)
{
 if (fh->size == 0)
 return;
 printf("%c%c%c%c\n", fh->id[0], fh->id[1], fh->id[2], fh->id[3]);
 printf("frame->size:%d\n", fh->size);
 printf("frame->flags:%d\n", fh->flags);</div>
<div>}
<div>int parse_id3_v2_header(struct id3_v2_header *vh, int fd)
{
 char buf[20];
 int i;
 uint32_t s = 0;</div>
<div> memset(buf, 0, 20);
 read_all(fd, buf, 10);</div>
<div> vh->id3[0] = buf[0];
 vh->id3[1] = buf[1];
 vh->id3[2] = buf[2];
 vh->id3[3] = 0;
 vh->ver_major = buf[3];
 vh->ver_minor = buf[4];
 vh->flags = buf[5];
 for (i = 0; i < 4; i++)
 {
 s = s << 7;
 s |= buf[6+i];</div>
<div> }
 vh->size = s;

 if (vh->ver_major != 3)
 {
 printf("Can't parse id3 with major:%d (Only major:3)", vh->ver_major);
 return 1;
 }
<div>
 return 0;
}
<div>static int get_id3_v2_frame_header(unsigned char *buf, struct id3_v2_frame_header *fh)
{
 int i;
 uint32_t b, s = 0;
 uint16_t f = 0;</div>
<div> fh->id[0] = buf[0];
 fh->id[1] = buf[1];
 fh->id[2] = buf[2];
 fh->id[3] = buf[3];</div>
<div> for (i = 0; i < 4; i++)
 {
 b = buf[4 + i];
 s = s << 8;
 s |= b;
 }
 fh->size = s;</div>
<div> for (i = 0; i < 2; i++)
 {
 f = f << 8;
 f |= buf[8+i];</div>
<div> }
 fh->flags = f;</div>
<div>}
<div>static int parse_id3_v2_frame(struct id3tag *id3, struct id3_v2_header *vh, int fd)
{
 unsigned char *buf, *tmp;
 int i;
 uint32_t s;
 struct id3_v2_frame_header fh;
 int f;</div>
<div> lseek(fd, 0, SEEK_SET);
 tmp = (unsigned char *)calloc(1, vh->size + 10);
 read_all(fd, tmp, vh->size + 10);</div>
<div> buf = tmp + 10;
 i = 0;
 while (i < vh->size - 10)
 {
 get_id3_v2_frame_header(buf + i, &fh);</div>
<div> if (vh->size - i < fh.size)
{
 printf("Error id3_v2_header size\n");
 return 1;
}
 // print_v2_frame_header(&fh);
 if (fh.size != 0)
add_id3tag(id3, &fh, buf+i);</div>
<div> i += fh.size + 10;
 }
<div> free(tmp);
 return 0;
}
<div>
int main(int argc, char *argv[])
{
 int fd;

 uint32_t size;
 struct id3_v2_header vh;
 struct id3tag id3;

 fd = open(argv[1], O_RDONLY);
 if (fd == 0)
 {
 fprintf(stderr, "Can't open file %s\n", argv[1]);
 exit(1);
 }
 parse_id3_v2_header(&vh, fd);
 
 // print_v2_header(&vh);</div>
<div> id3tag_init(&id3);</div>
<div> parse_id3_v2_frame(&id3, &vh, fd);</div>
<div> // output_id3tag(&id3);
 print_id3tag(&id3);
 id3tag_free(&id3);
 close(fd);
 return 0;
}
</div>
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　mp3　　id3　
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