📄 wma文件信息格式分析及代码 - mokemars的专栏 - csdnblog.htm
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free(string);<BR>
}<BR>
}<BR> // extract the
rating<BR> if((len =
contenth->rating_size) != 0)<BR>
{<BR> wstring =
(uint16_t*)&hdr[pos];<BR>
pos += len;<BR>
if (pos > hdr_len) goto len_err_out;<BR>
if ((string = get_ucs2str(wstring,
len)))<BR>
{<BR>
strcpy(tags->rating, string);<BR>
free(string);<BR>
}<BR>
}<BR> }<BR> pos = find_asf_guid(hdr,
asf_stream_ext_desc_guid, 0, hdr_len);/*找到扩展信息标志位置*/<BR> if
(pos >= 0)<BR> {<BR>
int i;<BR> //unsigned char
*ext_desc;<BR> uint16_t
flag;<BR> uint16_t
ext_desc_num;<BR> unsigned char
*string_name=NULL;<BR> unsigned char
*string_info=NULL;<BR> uint16_t* wstring =
NULL;<BR> uint16_t
len;<BR>
ext_desc_num=(*(uint16_t*)(&hdr[pos]));<BR>
//printf("%d\n",ext_desc_num);<BR>
pos += 2; <BR>
for(i=0;i<ext_desc_num;i++)<BR>
{<BR>
len=(*(uint16_t*)(&hdr[pos]));/*扩展名字信息大小*/<BR>
pos+=2;<BR>
wstring=(uint16_t*)&hdr[pos];<BR>
if ((string_name = get_ucs2str(wstring,
len)))<BR>
{<BR>
//printf(" %d.扩展信息名字
%s\n", i,string_name);<BR>
//free(string_name);<BR>
}<BR>
pos+=len;<BR>
flag=(*(uint16_t*)(&hdr[pos]));/*标志*/<BR>
pos+=2;<BR>
len=(*(uint16_t*)(&hdr[pos]));/*扩展名字对应值大小*/<BR>
pos+=2;<BR>
wstring=(uint16_t*)&hdr[pos];<BR>
if ((string_info = get_ucs2str(wstring,
len)))<BR>
{<BR>
//printf(" 扩展信息对应的值
%s\n",string_info);<BR>
//free(string_info);<BR>
}<BR>
asf_ext_info_add(tags,string_name,string_info);<BR>
pos+=len;<BR>
}<BR> }<BR>
close(fd);<BR> munmap(hdr,sb.st_size);<BR>
return 1;<BR> len_err_out:<BR>
close(fd);<BR> munmap(hdr,sb.st_size);<BR>
return 0;<BR>}<BR>int main(int argc,char **argv)<BR>{<BR> char
*filename=argv[1];<BR> int i;<BR> char
**info;<BR> struct asf_tags tags;<BR>
tags.ext_info=(char**)malloc(2*sizeof(char*));<BR>
read_asf_header(filename,&tags);<BR> char
**ext_info;<BR>
printf("Title:%s\n",tags.title);<BR>
printf("Author:%s\n",tags.author);<BR>
printf("Copyright:%s\n",tags.copyright);<BR>
printf("Comment:%s\n",tags.comment);<BR>
printf("Rating:%s\n",tags.rating);<BR> info =
tags.ext_info;<BR> for(i = 0; info[2*i] != NULL ;
i++)<BR> {<BR>
printf("%s: %s\n",info[2*i],info[2*i+1]);<BR>
}<BR> return
0;<BR>}<BR>这里已经做了相关信息的接口，利于扩展开发。希望这些能对那些正在进行相关开发的人员提供一点帮助。本人从事音频视频解码，希望能和大家一起探讨，共通进步。联系方法QQ：263542344
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