static int y4m_read_stream_header_line_cb(y4m_cb_reader_t * fd, y4m_stream_info_t *i,char *line,int n)
{
int err;
/* start with a clean slate */
y4m_clear_stream_info(i);
/* read the header line */
for (; n < Y4M_LINE_MAX; n++) {
if (y4m_read_cb(fd, line+n, 1))
return Y4M_ERR_SYSTEM;
if (line[n] == '\n') {
line[n] = '\0'; /* Replace linefeed by end of string */
break;
}
}
/* look for keyword in header */
if (strncmp(line, Y4M_MAGIC, strlen(Y4M_MAGIC)))
return Y4M_ERR_MAGIC;
if (n >= Y4M_LINE_MAX)
return Y4M_ERR_HEADER;
if ((err = y4m_parse_stream_tags(line + strlen(Y4M_MAGIC), i)) != Y4M_OK)
return err;
return Y4M_OK;
}
int y4m_read_stream_header(int fd, y4m_stream_info_t *i)
{
char line[Y4M_LINE_MAX];
char *p;
int n;
int err;
/* start with a clean slate */
y4m_clear_stream_info(i);
/* read the header line */
for (n = 0, p = line; n < Y4M_LINE_MAX; n++, p++) {
if (read(fd, p, 1) < 1)
return Y4M_ERR_SYSTEM;
if (*p == '\n') {
*p = '\0'; /* Replace linefeed by end of string */
break;
}
}
if (n >= Y4M_LINE_MAX)
return Y4M_ERR_HEADER;
/* look for keyword in header */
if (strncmp(line, Y4M_MAGIC, strlen(Y4M_MAGIC)))
return Y4M_ERR_MAGIC;
if ((err = y4m_parse_stream_tags(line + strlen(Y4M_MAGIC), i)) != Y4M_OK)
return err;
return Y4M_OK;
}
void y4m_init_stream_info(y4m_stream_info_t *info)
{
if (info == NULL) return;
/* init substructures */
y4m_init_xtag_list(&(info->x_tags));
/* set defaults */
y4m_clear_stream_info(info);
}
