snprintf(buf1, sizeof(buf1), "CSeq: %d\n", rt->seq);
snprintf(buf1, sizeof(buf1), "CSeq: %d\r\n", rt->seq);
static void rtsp_send_cmd(AVFormatContext *s,                           const char *cmd, RTSPHeader *reply,                           unsigned char **content_ptr){    RTSPState *rt = s->priv_data;    char buf[4096], buf1[1024], *q;    unsigned char ch;    const char *p;    int content_length, line_count;    unsigned char *content = NULL;    memset(reply, 0, sizeof(RTSPHeader));    rt->seq++;    pstrcpy(buf, sizeof(buf), cmd);    snprintf(buf1, sizeof(buf1), "CSeq: %d\n", rt->seq);    pstrcat(buf, sizeof(buf), buf1);    if (rt->session_id[0] != '\0' && !strstr(cmd, "\nIf-Match:")) {        snprintf(buf1, sizeof(buf1), "Session: %s\n", rt->session_id);        pstrcat(buf, sizeof(buf), buf1);    }    pstrcat(buf, sizeof(buf), "\n");#ifdef DEBUG    printf("Sending:\n%s--\n", buf);#endif    url_write(rt->rtsp_hd, buf, strlen(buf));    /* parse reply (XXX: use buffers) */    line_count = 0;    rt->last_reply[0] = '\0';    for(;;) {        q = buf;        for(;;) {            if (url_read(rt->rtsp_hd, &ch, 1) == 0)                break;            if (ch == '\n')                break;            if (ch != '\r') {                if ((q - buf) < sizeof(buf) - 1)                    *q++ = ch;            }        }        *q = '\0';#ifdef DEBUG        printf("line='%s'\n", buf);#endif        /* test if last line */        if (buf[0] == '\0')            break;        p = buf;        if (line_count == 0) {            /* get reply code */            get_word(buf1, sizeof(buf1), &p);            get_word(buf1, sizeof(buf1), &p);            reply->status_code = atoi(buf1);        } else {            rtsp_parse_line(reply, p);            pstrcat(rt->last_reply, sizeof(rt->last_reply), p);            pstrcat(rt->last_reply, sizeof(rt->last_reply), "\n");        }        line_count++;    }        if (rt->session_id[0] == '\0' && reply->session_id[0] != '\0')        pstrcpy(rt->session_id, sizeof(rt->session_id), reply->session_id);        content_length = reply->content_length;    if (content_length > 0) {        /* leave some room for a trailing '\0' (useful for simple parsing) */        content = av_malloc(content_length + 1);        url_read(rt->rtsp_hd, content, content_length);        content[content_length] = '\0';    }    if (content_ptr)        *content_ptr = content;}