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:Dezai.CN / 发布于2013/7/1/ 1006
只实现了基本的功能,用到iconv.

	#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>

	#define MAX_ID3_KEYS 16
	struct id3_v2_header
	{
	 char id3[4];
	 char ver_major;
	 char ver_minor;
	 char flags;
	 uint32_t size;
	};

	struct id3_v2_frame_header
	{
	 char id[4];
	 uint32_t size;
	 uint16_t flags;
	};

	struct id3_v2_frame_contents
	{
	 unsigned char id[4];
	 unsigned int size;
	 unsigned char *contents;
	};

	struct id3tag
	{
	 int num;
	 struct id3_v2_frame_contents v2[MAX_ID3_KEYS];
	};

	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;

	 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);

	 utf8p = pout;
	 if (iconv(cv, &pin, &len, &pout, &utf8len) < 0)
	 {
	 printf("iconv error\n");
	 return NULL;
	 }

	 iconv_close(cv);

	 return utf8p;
	}

	static int output_id3tag(struct id3tag *id3)
	{
	 int fd;
	 int i;
	 char *out_string;
	 char *tmp;

	 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);
	}

	void id3tag_init(struct id3tag *id3)
	{
	 memset(id3, 0, sizeof(*id3));
	}

	void id3tag_free(struct id3tag *id3)
	{
	 int i;

	 for (i = 0; i < MAX_ID3_KEYS; i++)
	 if (id3->v2[i].contents != NULL)
	 free(id3->v2[i].contents);
	}

	static int add_id3tag(struct id3tag *id3, struct id3_v2_frame_header *fh, unsigned char *buf)
	{
	 char *tmp, *out_string;
	 int i;

	 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;

	 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);
	 }
	 }
	 }

	 id3->num++;
	 }
	}
	static void print_id3tag(struct id3tag *id3)
	{
	 int i;

	 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);
	 }
	 }
	}

	static ssize_t read_all(int fd, void *buf, size_t count)
	{
	 char *buffer = buf;
	 int pos = 0;

	 do
	 {
	 int rc;

	 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;
	}

	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);
	}

	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);

	}

	int parse_id3_v2_header(struct id3_v2_header *vh, int fd)
	{
	 char buf[20];
	 int i;
	 uint32_t s = 0;

	 memset(buf, 0, 20);
	 read_all(fd, buf, 10);

	 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];

	 }
	 vh->size = s;

	 if (vh->ver_major != 3)
	 {
	 printf("Can't parse id3 with major:%d (Only major:3)", vh->ver_major);
	 return 1;
	 }

	 return 0;
	}

	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;

	 fh->id[0] = buf[0];
	 fh->id[1] = buf[1];
	 fh->id[2] = buf[2];
	 fh->id[3] = buf[3];

	 for (i = 0; i < 4; i++)
	 {
	 b = buf[4 + i];
	 s = s << 8;
	 s |= b;
	 }
	 fh->size = s;

	 for (i = 0; i < 2; i++)
	 {
	 f = f << 8;
	 f |= buf[8+i];

	 }
	 fh->flags = f;

	}

	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;

	 lseek(fd, 0, SEEK_SET);
	 tmp = (unsigned char *)calloc(1, vh->size + 10);
	 read_all(fd, tmp, vh->size + 10);

	 buf = tmp + 10;
	 i = 0;
	 while (i < vh->size - 10)
	 {
	 get_id3_v2_frame_header(buf + i, &fh);

	 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);

	 i += fh.size + 10;
	 }

	 free(tmp);
	 return 0;
	}

	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);

	 id3tag_init(&id3);

	 parse_id3_v2_frame(&id3, &vh, fd);

	 // output_id3tag(&id3);
	 print_id3tag(&id3);
	 id3tag_free(&id3);
	 close(fd);
	 return 0;
	}
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