Replace get_buffer with?

    cur_offset = avio_tell(pb);
    if (!para->playctrl_info.read_end_flag && (0 == pkt->data_size)) {
        rev_byte = get_buffer(pb, pbuf, para->max_raw_size);
        if ((rev_byte > 0) && (cur_offset <= para->pFormatCtx->data_offset)) {
            try_count = 0;
            pkt->data_size = rev_byte;
            para->read_size.total_bytes += rev_byte;
            pkt->avpkt_newflag = 1;
            pkt->avpkt_isvalid = 1;

  do {
                read_length = get_buffer(s->pb, data + 12, read_size);
                if ((read_length <= 0) || (sync_flag == 1024)) {
                    if (read_length == AVERROR(EAGAIN)) {
                        continue;
                    } else {
                        FREE(data);
                        log_error("[%s]get data failed. ret=%d\n", __FUNCTION__, read_length);
                        return 0;
                    }
                } else {
                    break;
                }
            } while (retry_get_data < am_p->playctrl_info.read_max_retry_cnt);
            pkt = data;